How to diagnose a crank no start condition?
Here is a step by step procedure on how you can Diagnose a Crank no start condition. In order for an engine to run, you need a Spark, Fuel, Compression and the ability for the engine to take in Air and push out Combustion Exhaust.
What happens when you open the hood of your car?
Pressure builds under the radiator cap in the cooling system as a car runs. Open the hood so cool air can blow over the engine. Wait until the temperature gauge inside your vehicle has gone down to zero degrees. Never spray or “hose down” a hot engine. When your car overheats and you turn it off, spraying cold water on it may crack the engine!
Where is the wheel well battery under the hood?
The battery, primarily on older models, is located behind the driver’s seat in a box under the carpet. In a Chrysler with a wheel-well battery, there is a remote positive (“+”) terminal under the hood located in the fuse box (number 6 in Figure 3 below). It has a red, plastic cover on it.
What do you need to know about under the hood?
Information Labels: These labels provide information about your specific vehicle. Hood Latch: The hood latch is used to access under the hood. Typically, a button or lever inside the vehicle on the driver’s side pops the hood to allow access to the hood latch. Serpentine Belt: The serpentine belt wraps around all the pulleys in the engine.
Why is there no hood switch on my enormis?
If something is “dangling” from the firewall that could be the hood sensor/switch that should be attached to the hood. . This can especially happen after a mechanic over extends your hood and pulls off our safety switch! If you don’t see anything do not worry, sometimes ENORMIS uses the factory installed hood safety switch. 2.
What’s the difference between not starting an engine and not cranking over?
There is a difference between an engine that does not start (run) and one that does not crank over. An engine that does not crank over has to do with the starter motor and is a separate issue from an engine that does not run. If your engine does not crank over refer to the lower part of this guide (starter motor image).
Why does my car not start when the hood is up?
This device gets installed under the hood of your vehicle and prevents the engine from starting when the hood is up. It is a safety device, designed to prevent your vehicle from accidentally starting when someone is working in the engine compartment, since an injury could occur. The good news is that Enormis can fix this quickly and painlessly.
How to know if your engine has no spark?
First Confirm Your Engine Has No Spark. 1 Disable the fuel system by removing the fuel pump fuse or relay. 2 Insert a spark plug tester into the plug boot and ground it on a piece of metal on the engine. 3 Finally, Have someone crank the engine and watch for spark.
What to do if your car won’t start when you crank the engine?
Remove a plug wire, insert a Phillips screwdriver or spare plug piece of bare wire into the plug wire boot and place the end near the engine block (do not hold the plug wire while cranking the engine unless you want a shocking experience). If there’s a spark when the engine is cranked, it has ignition. The problem is either fuel or compression.
What does it mean when your car won’t start?
If this time you see a spark or no spark, you have a problem in the ignition system. Consult your vehicle repair manual for your particular model for further diagnosis. Depending on your particular model, you may have a problem with an ignition coil, distributor, ignition module, igniter, or some other related component.
First Confirm Your Engine Has No Spark. 1 Disable the fuel system by removing the fuel pump fuse or relay. 2 Insert a spark plug tester into the plug boot and ground it on a piece of metal on the engine. 3 Finally, Have someone crank the engine and watch for spark.
What to do when your car cranks but won’t start?
If the coil is sparking and the rotor turning, check ignition timing. If there’s no spark, check the points or ignition module. If the rotor isn’t turning, the distributor shaft has most likely snapped and you need to replace the distributor. Check the condition of the distributor cap. Is the underside of the cap wet?
Why does my MerCruiser crank but won’t start?
Unable to start enging during spring commissioning. battery fully charged, engine turns over, have spark at plugs and coil, have fuel coming in to carb. The carb was rebuilt 2nd half of last season, and installed new alternator, new points gaped at .022, new distributor cap, new roto, new spark plugs gaped at .035, and new spark plug wires.
Why does my Car start but won’t start?
But one thing to remember when trying to diagnose why your car won’t start is that the basics never change. It needs fuel, it needs air, and it needs spark. These three need to come together at the right time and in the right quantities for the engine to run.
What happens if there is no spark in the engine?
Without spark to ignite the fuel mix in the combustion chamber, the engine will not start. It will turn over or “crank over” but will never actually run. Spark issues are not limited to the plugs.
Why does my car not start when I crank the engine?
The crankshaft position (CKP) sensor monitors the position or rotational speed of the crankshaft. If the crankshaft position sensor has failed completely, and isn’t sending a signal to the (ECU) at all, then the computer won’t send any fuel to the injectors. This will leave you unable to start the car.
What should I do if my Chevy Spark wont start?
Spark issues are not limited to the plugs. Check the spark plug wires, the distributor or module, and plug gap. These all have a huge effect on the function of the ignition system. Pearl Wilson is typing…
The crankshaft position (CKP) sensor monitors the position or rotational speed of the crankshaft. If the crankshaft position sensor has failed completely, and isn’t sending a signal to the (ECU) at all, then the computer won’t send any fuel to the injectors. This will leave you unable to start the car.
What happens when there is no spark in the engine?
When there is no spark, the engine will not start. You’ll probably have a misfire related code such as P0300, P0301, etc….. Ignition issues can be caused by many things, including bad spark plugs, bad coil packs, bad plug wires, computer issues, and more.
What to do if your forklift cranks over but doesn’t start?
If you do not have voltage at this point check the ignition circuit thru the ignition switch, fuses, and wire harness connections. If you have voltage at the positive post of coil move your test probe to the negative side of the coil. Now crank the engine over. You should see your test light blink on and off as the engine turns over.
Why is my outboard not cranking or turning over?
This can be caused by something as simple as a flat battery or range from faulty switches and blown fuses to a bad starter motor or even a seized engine. With a simple multimeter and a few ideas you’ll be able to figure out why your outboard won’t crank in no time.
It may be possible that one of these components has failed and is cutting off power to the vehicle’s ignition and fuel systems. If these check out, then it may be possible that the issue is wiring-related, in which case I would carefully examine the engine bay for any worn, frayed, or otherwise potentially faulty wiring.
What to look for when your engine won’t start?
Check for a blown fuse that may be preventing a circuit from working properly, like the fuel injection or computer system. To operate efficiently, an internal combustion gasoline engine needs a good spark, the right amount of fuel, and good compression (a healthy mechanical condition).
What to do if there is no spark or fuel?
If there is no spark or fuel, then the first thing I would do is check the vehicle’s fuses and relays, particularly the EFI main and ignition relays. It may be possible that one of these components has failed and is cutting off power to the vehicle’s ignition and fuel systems.
If the engine doesn’t crank, or makes an unusual noise when cranking, you may have a starting system problem. The car’s security system may have made an error that disabled the fuel or ignition system, or the chip in the key may have failed.
What makes an internal combustion engine not start?
To operate efficiently, an internal combustion gasoline engine needs a good spark, the right amount of fuel, and good compression (a healthy mechanical condition). The lack of any of these three things will prevent your engine from starting.
What causes a car to stall with no spark?
Consequently, An old or failing ignition pickup may cut out signal intermittently, which may cause the engine to stall. The engine may suddenly just shut off, almost as if the key had been turned off. Depending on the nature of the issue, sometimes the vehicle can be restarted and driven.
Why do I get an error code on my crankshaft?
The crankshaft position sensor is a stationary piece, but it works with the reluctor ring to determine positioning and voltage. When something occurs to interrupt the transference of signals, you will likely end up receiving an error code. However, there are many reasons for this message to occur.
What should I do if my car engine is not cranking?
If your engine is not cranking, make sure that the car battery is charged and that it’s not failed. You can either try to jump start it from another car or with the help of a jump starter. You can also work with a different car battery if you have one at home. If the battery is good and the jump start didn’t help the engine to crank.
What should I do if my crank sensor is not working?
If there is no reading, then you can check the crank sensor for any sign of damage and make repairs as necessary. If the sensor looks fine, then you should contact an experienced mechanic to use a scope and assess the damage. You can also check for any loose wiring or connections.
What causes a cranks but does not start condition?
The two most common causes of a no-start condition, in my experience, are a lack of fuel or a lack of spark. This article will shed some light on the most basic steps that you have to take in diagnosing a CRANKS, BUT DOES NOT START condition.
When do you need to do an engine diagnostic?
Conducting an engine diagnostic when your vehicle’s self-diagnostic system apparently isn’t detecting any problems can be difficult. But you still can diagnose engine performance and driveability problems like… …if you know what are the components or systems most likely to cause these common issues.
Can you do a diagnostic without a trouble code?
Throughout the years, more emission related systems and components have been incorporated to the list of computer monitored systems. Still, some performance and driveability problems can appear without the computer setting any DTC. So you need a different strategy to do a diagnostic without the help of a trouble code.
Check for a blown fuse that may be preventing a circuit from working properly, like the fuel injection or computer system. To operate efficiently, an internal combustion gasoline engine needs a good spark, the right amount of fuel, and good compression (a healthy mechanical condition).
What makes an engine not start or run?
All engines require three things to start and run: spark, fuel and compression. If any one of these is missing, your engine will not start. The fuel pump is running and delivering normal pressure to the engine
Why is my car cranking but not starting?
One, your engine is having trouble producing a spark. Two, your engine is having difficulty obtaining fuel. Three, your engine is creating compression. What is so pivotal about these three components is that to successfully run and drive the vehicle the engine needs fuel, compression, and a spark all working simultaneously.
What causes the fuel pump to not start?
The fuel pump is running and delivering normal pressure to the engine But, with all that working your engine still will not start. So, the most likely cause, is that the fuel injectors are probably not opening. The (PCM) uses the trigger signal from the crankshaft position sensor; and/or camshaft position sensor to pulse the injectors.
All engines require three things to start and run: spark, fuel and compression. If any one of these is missing, your engine will not start. The fuel pump is running and delivering normal pressure to the engine
The fuel pump is running and delivering normal pressure to the engine But, with all that working your engine still will not start. So, the most likely cause, is that the fuel injectors are probably not opening. The (PCM) uses the trigger signal from the crankshaft position sensor; and/or camshaft position sensor to pulse the injectors.
What to do when your car cranks but wont start?
Use a multimeter to check the connectors on the fuel injectors. If the voltage isn’t measuring up, there is an issue with the connectors or the wiring. If you’re still having issues, check the crankshaft position sensor, the camshaft position sensor, or the throttle position sensor.
What does it mean when your Kohler engine wont start?
No spark means that the spark plug is defective and needs to be replaced. The purpose of the ignition coil is to send the appropriate voltage to the spark plug as the engine runs. When the coil is defective or damaged, the engine won’t start.
When to go to the Mechanic about a bad timing chain?
If the belt is jumping because it’s gotten loose, it can also flail around and damage other parts of the engine. If your engine won’t start or starts driving rough, indicating it may be on its way to failing, contact a certified mechanic for inspection and repairs. 4. Check Engine Light is on
Use a multimeter to check the connectors on the fuel injectors. If the voltage isn’t measuring up, there is an issue with the connectors or the wiring. If you’re still having issues, check the crankshaft position sensor, the camshaft position sensor, or the throttle position sensor.
What does it mean when your car cranks but won’t start?
Some car owners think that it means that the engine is running. To a technician, it just means that the starter is successfully engaging the flywheel and rotating the engine’s crankshaft. Some technicians will interchange this with the word “cranking.”
Why is the Check Engine light not coming on?
Even if the check engine light hasn’t come on, you may find a pending code that can guide you in your diagnosis. False input or lack of input from sensors like the crankshaft position sensor (CKP) or camshaft position sensor (CPS) can prevent the engine from starting.
Which is the strongest 4 cylinder engine in the world?
One of the strongest Powerboat-4-cylinders is the Volvo Penta D4-300 turbodiesel. This is a 3.7 L-inline-4 with 300 hp (224 kW) and 516 lb⋅ft (700 N⋅m). Brunswick Marine built a 127 kW (170 bhp) 3.7 L 4-cylinder gasoline engine (designated as the “470”) for their Mercruiser Inboard/outboard line.
What kind of engine has a single bank of cylinders?
The single bank of cylinders may be oriented in either a vertical or an inclined plane with all the pistons driving a common crankshaft. Where it is inclined, it is sometimes called a slant-four.
What was the compression ratio of the 400 Ford engine?
Although Ford did not make a piston to correct this, T Meyer Inc worked with Keith Black pistons to make a 400 piston that increases the compression ratio and gives the piston a “zero deck” deck clearance.
What kind of engine does a Honda Big Red have?
The Honda Big Red, not the rack bearing three-wheeler from the early 80’s but the new MUV 700 (Multi Use Vehicle) Side x Side, is powered by a 675cc single cylinder 4-stroke engine. The Big Red isn’t the biggest or quickest UTV on the market, but it is a Honda which means it’s one of the most dependable.
How big is a big red Torin rotating engine?
Engine stand features a 3/4 ton (1,500 lb) load capacity and is equipped with (2) fixed casters and (3) 360-degree swivel casters for smooth maneuverability Quick folding mechanism allows for saving space when not in use during storage in your garage or workshop
Where can I buy parts for a Honda Big Red?
Order your OEM Honda Big Red Utility Vehicle Parts here, use our OEM Parts Diagram Lookup to purchase your original equipment honda parts for the Big Red or call us toll free 1-800-964-1882 for locating We now have all honda parts listed at 20% MSRP. All Prices shown are the discounted prices.
How big is Big Red Torin engine hoist shop crane?
BIG RED T32100 Torin Engine Hoist Shop Crane Accessory: Steel 3 Position Engine Leveler with Adjustable Handle, 3/4 Ton Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service. Would you like to tell us about a lower price?
Why does my car not start with a new crankshaft sensor?
A new crankshaft sensor should not have prevented the vehicle from starting. The cause of the no start issue is either related to a fuel or ignition issue that the vehicle has or something that happened during the replacement of the crank sensor.
What causes a jeep to have a no start condition?
The usual suspects, that can cause this type of problem, are a bad fuel pump, bad crank sensor, bad ignition coil (if your Jeep is distributor equipped), etc. Does Not Crank Condition: Means that the engine is not cranking when you turn the key to crank the engine.
Why does my car not start when I Turn on the engine?
False input or lack of input from sensors like the crankshaft position sensor (CKP) or camshaft position sensor (CPS) can prevent the engine from starting. Also, a bad throttle position sensor (TPS) may cut off the spark to the cylinders. Battery.
What causes no crank no start?
With a no crank/no start condition, the first thing to check is the battery. The battery or battery problems are the number-one cause of this type of no-start condition.
Why is my engine not starting?
When your engine cranks but won’t start or run, it could mean your engine is having trouble producing a spark, getting fuel, or creating compression. The most common causes are in the ignition (for example, a bad ignition coil) or fuel system (for example, a clogged fuel filter).
Does your car turn over but won’t start?
There may be occasions when your car turns over but won’t start. Basically, an engine needs three things to run smoothly – fuel, spark and compression. The engine depends on several other things to run smoothly such as fuel, ignition systems, etc.
Why would a diesel engine not start?
Another reason your engine may not be starting is that your diesel fuel is contaminated. If it does start, it’s a common cause of stalling out. First, smell the fuel in your tank to make sure it does not have any traces of gasoline. If it does, flush the tank immediately and refill with diesel fuel.
If the engine doesn’t crank, or makes an unusual noise when cranking, you may have a starting system problem. The car’s security system may have made an error that disabled the fuel or ignition system, or the chip in the key may have failed.
What causes a car to have a no start condition?
There are actually quite a few mechanical issues that can cause a no-start condition with an engine. This video covers the basics of dealing with a crank/no start condition to get you started. If playback doesn’t begin shortly, try restarting your device.
Here is a step by step procedure on how you can Diagnose a Crank no start condition. In order for an engine to run, you need a Spark, Fuel, Compression and the ability for the engine to take in Air and push out Combustion Exhaust.
There are actually quite a few mechanical issues that can cause a no-start condition with an engine. This video covers the basics of dealing with a crank/no start condition to get you started. If playback doesn’t begin shortly, try restarting your device.
What does it mean when your car says no crank?
A No Crank Condition means that the engine is not turning over when you turn the key to crank the engine. The most common problem, that causes this condition is a failed starter motor. The most common problem, that causes this condition is a failed starter motor.
Can a crank sensor cause a motor to run bad?
If you have rpm signal crank sensor is good. Yes they have a fuel distributor that’s a problem most times plastic fuel lines will crack. But it would still fire up and run bad. If it has a bad PCM a scan tool most times will not communicate with it. But if you have spark then even newer motors will fire up with starting fluid.
Why does my car engine not want to start?
If the engine still doesn’t seem like it wants to start, probably fuel is getting into the cylinders and your problems lies somewhere else. However, if the engine runs momentarily and dies, then the problem is that fuel is not getting to the cylinders. Check for a clogged fuel filter, or a bad fuel pressure regulator.
Is the engine cranks but no start a problem?
Engine cranks, but no start! Discussion in ‘ 3rd Gen 4Runners (1996-2002) ‘ started by ZO4, Jun 28, 2018 . My 4Runner last week was working just fine, able to crank and start up with not a problem. As of recently, it has become parked because it doesn’t want to fire right up.
Why does my Car Crank but won’t fire up?
Worn spark plugs can cause a “cranks but won’t fire up condition.” Worn spark plugs produce a weak spark that’s not hot enough to ignite cold fuel. If you haven’t changed your spark plugs according to the car makers recommendations, they can leave you with a car won’t start when cold or worm condition.
If you have rpm signal crank sensor is good. Yes they have a fuel distributor that’s a problem most times plastic fuel lines will crack. But it would still fire up and run bad. If it has a bad PCM a scan tool most times will not communicate with it. But if you have spark then even newer motors will fire up with starting fluid.
What does it mean when your car says no start?
A No Crank Condition means that the engine is not turning over when you turn the key to crank the engine. The most common problem, that causes this condition is a failed starter motor. If your vehicle is suffering a No Crank Condition, this tutorial may be a good starting point: How To Test The Starter Motor (GM 4.3L, 5.0L, 5.7L).
Why does my Dodge Dakota engine not start?
A no spark condition, that’s causing the engine not to start, is usually caused by a defective crankshaft position sensor. Test the fuel system: We need to make sure gasoline is reaching the cylinders. This is accomplished by doing a a fuel pump pressure test.
What’s the difference between no start and no crank?
It’s important to know that a no crank and a no start condition are not the same thing since this article only concentrates on testing a no start condition. In layman’s terms, a No Start Condition means that your vehicle’s starter motor is cranking the engine but the engine is not starting.
Why does my 2002 Ford F150 not start?
Engine cranks but won’t start. 2002 Ford F150 ford 2002 Occasionally engine cranks but won’t start. Getting worse. I had fuel pump relay checked and it was good. Purchased a new one anyway. Checked fuel pressure once it started. It was 32 psi. Lost less than 5% when shut off. Replaced fuel pump.
A No Crank Condition means that the engine is not turning over when you turn the key to crank the engine. The most common problem, that causes this condition is a failed starter motor. If your vehicle is suffering a No Crank Condition, this tutorial may be a good starting point: How To Test The Starter Motor (GM 4.3L, 5.0L, 5.7L).
Why does my car not start when there is no fuel?
A fuel supply; without fuel, the engine won’t run. A spark (for gasoline-powered engines). The spark is delivered to the combustion chamber via the ignition system. If you have a fault here, the engine won’t start.
A fuel supply; without fuel, the engine won’t run. A spark (for gasoline-powered engines). The spark is delivered to the combustion chamber via the ignition system. If you have a fault here, the engine won’t start.
Can a bad ignition pickup cause an engine to stall?
One of the first symptoms of a bad ignition pickup is an engine that stalls and eventually will not restart. Consequently, An old or failing ignition pickup may cut out signal intermittently, which may cause the engine to stall. The engine may suddenly just shut off, almost as if the key had been turned off.
Can a 2003 Cummins have a hard start?
One of the most common calls we get are from customers with a 2003-2007 Cummins that have developed either a hard start or no start condition. In order to help out, we had our very own Tyler Lucas, put together this step by step tutorial that you will hopefully find insightful.
What causes a car engine to not start?
An engine needs three things to run: A fuel supply; without fuel, the engine won’t run. A spark (for gasoline-powered engines). The spark is delivered to the combustion chamber via the ignition system. If you have a fault here, the engine won’t start. Mechanical integrity.
How to fix no crank no start on Subaru Impreza?
Quick Fix, no crank no start on subaru impreza, crosstrek, forester, outback, legacy and wrx. – YouTube If playback doesn’t begin shortly, try restarting your device.
Why does my Mazda 3 crank but not start?
Not sure if this is relevant or not. After doing a routine oil change in my garage, the engine will crank (pulleys and belts rotate), but it does not start. I called AAA, they showed up and immediately hooked up a battery booster.
Consequently, An old or failing ignition pickup may cut out signal intermittently, which may cause the engine to stall. The engine may suddenly just shut off, almost as if the key had been turned off. Depending on the nature of the issue, sometimes the vehicle can be restarted and driven.
What would make your Car Crank but not start?
Why does it crank but not start?
In layman’s terms, a No Start Condition means that your vehicle’s starter motor is cranking the engine but the engine is not starting. This condition is usually due a failed fuel pump, a failed ignition coil, a failed ignition control module, a failed crank sensor, etc… that lets the engine crank (turn over) but does not let it start.
What does crank no start mean?
The crank/no start is when the spinning of the engine is heard, but it doesn’t catch for the car to run on its own. The no crank/no start is just that-you don’t hear the car crank (hearing crickets) and the car doesn’t start. With most, it may be a given, but for those who honestly may not know,…
What causes a car to not start or turn over?
With the major systems checked out, there are a number of other things you can check to see why your car won’t start. Loose Starter: Loose starter bolts will cause it to dance around and wiggle, failing to turn the engine over.
The battery or battery problems are the number-one cause of this type of no-start condition. A quick way to check your battery is to turn your headlights on. If the headlights come on and are nice and bright, not dim or dull, then it’s likely your battery and its connections are okay.
Why does my car not start with a full signal?
If the starter relay does not receive a full signal, your car will not start. Sometimes your engine fires up immediately while at times it takes a couple of tries. If this happens to you, it might be a case of cumulated debris on the starter relay. You should clean it up and see if it solves the problem.
What should I do if my starter is not working?
The starter pinion gear engages this wheel to make your car engine crank. Remove the starter motor and set your transmission gear to neutral. Rotate the crankshaft manually using a ratchet. There is a pulley at the front or bottom of your engine block. The pulley should move as you watch how the pion gears are reacting.
Where is the pinion gear on a car starter?
Check the pinion gear. It is a small gear found at the front of the starter of your car that will engage the flywheel and crank your engine. You should ensure that the teeth of your pinion gears are not worn-out or damaged. Damaged teeth will prevent your car engine from cranking.
How to test no spark no start test?
No spark from all of the Coil-On-Plug Ignition Coils. No fuel injector pulses from the fuel injector connectors as tested using a Noid Light. P0335: No Crank Sensor Signal Detected. P0336: Inconsistent Crank Sensor Signal Detected.
What should I do if my crank sensor goes bad?
Activate all 8 fuel injectors to start spraying fuel into the cylinders. Maintain the fuel pump activated after its initial start. With fuel and spark now present, the engine now starts. The most important thing to know, is that if the crank sensor goes bad, your 4.8L, 5.3L, 6.0L GM vehicle vehicle will ‘Crank but Not Start’.
Can a crank and cam sensor be replaced?
I replaced both the cam and crank sensor and car still will not start but if I unplug the crank sensor it starts up and runs like crap. I can not figure out what to do next. My car has 91000 miles. My car has an automatic transmission. You should check to see if your vehicle has jumped timing.
Can a bad crankshaft sensor cause a check engine light?
Another issue of a potential problem with the crankshaft position sensor is an illuminated Check Engine Light. If the computer detects a problem with the crankshaft position sensor’s signal, it will activate the Check Engine Light to alert the driver of the problem. A Check Engine Light can also be set off by a wide variety of other issues.
Is there a no crank no start truck?
Discussion in ‘ Freightliner Forum ‘ started by sixxjoe, May 19, 2013 . I have an 07 m2 with a no crank no start…I have power everywhere is should be…starter alt power block on the fender well but when I key up the truck I get a beep and no gauge sweep or codes.
Is there a no crank no start scanner?
I removed the starter tested it comes back fine, completely cleaned and sealed the fuse block outside great battery power but now I am lost. am a 1 man show for a small company and no scanners are available to me, so ideas without breaking the bank? bonous Thanks this. Every month 400 people find a job with the help of TruckersReport.
What to do if your outboard crank wont turn on?
Crank the engine or use DDT output load test for each ignition coil and observe spark. If no spark is present, replace appropriate ignition coil. If spark is present, replace spark plugs. Air in the fuel system. To correct this check for air in the fuel supply manifold. More information on this can be found in the download repair manual.
Why is there no spark on my 68 VW?
Had a very similar problem on a 68 VW. No spark. Replaced the coil, center wire, points and the rotor. Nada. Turned out to be the center pin conductor in the rotor cap. Looked OK, but on close inspection, the little metal tip was gone. New cap cured the problem.