What to do when your Miata says no start?
Backprobe a control wire with your test light, other end clipped to ground, and crank the engine. You want to see flickering in the test light. If the light just remains on there is no injector control happening. Start looking at the Crank Angle Sensor, that sensor gives the ECU the timing information it needs for injectors and spark.
Where are the control wires on a Miata?
Each injector has two wires, a power wire and a ground control wire that goes to the ECU. The power wires will be the same color on each injector. The control wires are different colors. Backprobe a control wire with your test light, other end clipped to ground, and crank the engine.
Why does the fuel pump not come on in a Miata?
The fuel pump relay on the NA8 is grounded by the ECU when engine speed reaches 50RPM. Power to the relay is fed through the main relay. In a condition where you have no RPM signal from the CAS the pump won’t come on. But lets make this as easy as possible. We know we have injector pulse, we know we have spark, and we know the cam is spinning.
How can I tell if my Miata has a failed EFI relay?
Check the Main EFI Relay. Putting the key in “RUN” and unplugging/plugging the relay to see if it clicks is a very basic test here, but a failed relay can still click a little bit (mine did) and lead you astray.
What does crank no start mean on a Miata?
It should, if it doesn’t it may mean you don’t have an RPM signal. When you turn the key to the on position confirm the Check Engine Light comes on. If it doesn’t your ECU is not functioning correctly. Remove the oil fill cap and have a friend crank the engine, make sure the camshaft is spinning. If not your timing belt has broken. Check for spark.
How can I tell if my Miata has no spark?
You can pull a a spark plug out and attach it to the wire and lay it on the valve cover. Crank the engine, you should see spark. Check cylinders one and two. One and Four share the same coil and 2 and 3 share the same coil. If you have no spark on either one or two, start suspecting Crank Angle Sensor or CKP sensor on crank.
The fuel pump relay on the NA8 is grounded by the ECU when engine speed reaches 50RPM. Power to the relay is fed through the main relay. In a condition where you have no RPM signal from the CAS the pump won’t come on. But lets make this as easy as possible. We know we have injector pulse, we know we have spark, and we know the cam is spinning.
What do you need to know about Crank no start?
Start looking at the Crank Angle Sensor, that sensor gives the ECU the timing information it needs for injectors and spark. If you have all those things, we need to look at fuel pressure and fuel pump operation. The fuel pump relay on the NA8 is grounded by the ECU when engine speed reaches 50RPM. Power to the relay is fed through the main relay.
Where to plug in diypnp in Mazda Miata?
Either plug a Stimulator Power Supply into the front panel of the box (the easiest way), or, start the Jumper Section below, but only connect the power and ground wires to start with. That way you can plug the DIYPNP into your factory wiring harness and safely power it from your car.
Where does the spark output go on a Mazda Miata?
The top resistor goes to IGN and the bottom resistor goes to IAC2B.When wiring up your ECU later: Spark Output A will come out on pin36, and Spark Output B will come out on pin31. NOTE– If you’re modding up an MS-I PCBv2.2 ECU you can use the documentation at this link to use your stock ignitors.
What kind of wiring harness does a Mazda Miata use?
The vehicle used for drawing up these application docs was a USDM 1991 Mazda Miata 1.6L with a manual transmission. The factory wiring harness is in perfect condition. 1- DIYPNPN76-K Kit.
Is there a Mazda Miata engine on eBay?
On eBay, there is a full spectrum of new and used compete engines for the Mazda Miata. Not every Miata engine fits every year of the vehicle. You might find a 1.8 Miata engine for sale right away, but your year of Miata requires a 1.6 or 2.0. Review this guide to the four generations of Miata engine for sale.
Is the 1991 Mazda NA Miata in good condition?
Gorgeous 1-Owner Crystal White 1991 Mazda NA Miata with the factory painted to match Hardtop we sold through our Mazda store 30 years ago. It was the subject of a complete, trim off paint-job at our certified body shop. It was not damaged, but the paint was not in good condition and warranted this.
What kind of resistor do I need for Mazda Miata?
Install a 470 ohm 1/4w resistor between the right side (non-band) end of D1 and the left leg (banded end) of D9. You’ll start with an MS1 V3.57 set up for Hall / opto triggering. This means you’ll have JP1 in the 2-3 position and J1 in the 1-2 position.
The top resistor goes to IGN and the bottom resistor goes to IAC2B.When wiring up your ECU later: Spark Output A will come out on pin36, and Spark Output B will come out on pin31. NOTE– If you’re modding up an MS-I PCBv2.2 ECU you can use the documentation at this link to use your stock ignitors.
What to do if your engine has no spark?
If you have no spark on either one or two, start suspecting Crank Angle Sensor or CKP sensor on crank. The CKP on these engines is primarily used for misfire counting, but I have good reason to believe that the ECU uses this signal for spark timing, too. Check for injector pulse. Use Fuel Injectors for identification.
Start looking at the Crank Angle Sensor, that sensor gives the ECU the timing information it needs for injectors and spark. If you have all those things, we need to look at fuel pressure and fuel pump operation. The fuel pump relay on the NA8 is grounded by the ECU when engine speed reaches 50RPM. Power to the relay is fed through the main relay.
Why is my Miata engine cranking but not starting?
It really can get that one last start out of it. There are a lot of issues that can cause your Miata to crank, but not start. The engine needs air, fuel, and a spark in order to run. It is highly likely that if the engine is cranking, but not starting that it has thrown an OBDII code.
What causes a car to crank but not start?
One of the biggest issues that causes a vehicle to crank but not start is ignition issues. 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.
Why does my Acura MDX not start up?
As a battery ages, it’s “cranking amps” decrease, leaving it with a diminished capacity for starting the vehicle. When this happens, you’ll often hear the vehicle crank slowly, but not start. You can take your battery up to the local parts store, or even Wal-Mart, and have it tested to see if it is still holding a charge.
How are the Flash codes read on a Mazda?
The codes are read exactly as they are when reading the engine codes, except that the Hold light flashes, not the Check Engine Light. A summary of the codes and the reasons: