What does rough idle mean on a GMC Sierra?

rough idle, stalling, loss of power. o2 sensor code 44 (lean) Replaced: coolant temp sensor, tps, map sensor, fuel filter, and o2 sensor. It will run normal on occasion but only lasts about 45 seconds or so.

Why does my GMC Sierra 1500 stall at high RPM?

At higher rpm seem almost like the exhaust is clogged but the cat has been bored, itll rev up but just wont really go. Today experienced a poping sound almost like a backfire from underneath. After the truck starts and is warm at a stable idle in park/neutral it’ll rev up fine.

What does the fuel smell like in a GMC Sierra 1500?

If so pull the air filter off and sniff the throttle body for a fuel smell. If the diaphragm has ruptured it will literally be like putting a hose with fuel into the intake and running it full.

What happens when the diaphragm is ruptured on a GMC Sierra?

If the diaphragm has ruptured it will literally be like putting a hose with fuel into the intake and running it full. When it initially started to go it probably slowly flooded the engine to where it seemed to run ok but the excess fuel created a ton of carbon coating the O2 sensor. Since no air could pass through it, it gave a false lean reading.

How long does it take to tune up a GM Truck?

Most of these thing can be done in your driveway with little know how and a few tools. If i were you, I would just do it myself, tune ups are easy, and you can do one in less than six hours, (for a full tune up). Other wise your looking at any wer fromm 300 to a 1000 bucks just in labor to have some one do it for you.

What should I change in my GM Truck?

For your tranny, if you dont do alot of towing, then you can just change the fluid in it. For your engine coolant, You should deffinetlly change it, especially if you live in cold weather. And for your fan belt, just replace it, its an easy and cheap fix.

What to do for a 100, 000 mile tune up?

Change ALL fluids. Trans, diff’s, transfer case, power steering, and flush brakes clean. All new soft parts, belts, hoses, wires, plugs, brake lines, and check steering hoses for leaks. U-joints, if stock, are going to fail and should be replaced. Ball joints, tie rod ends all need lubed and inspected along with brake rotor and pads checked.

What causes a GMC Sierra 1500 to lean?

The only other thing that will cause a lean condition is low fuel pressure. A vacuum leak will be problematic at idle and go away with higher rpms. Low fuel pressure will get much worse at higher rpms. 123 people found this helpful.

How long has the GMC Sierra been on the road?

We purchased this truck with utility body in 2004 as a back up truck to our other trucks and vans. However, everybody fell in love with the truck and it soon became our everyday go to truck. It has been on the road for 17 years, every day, 7 days a week. We have never had any major problem with it.

What kind of engine does GMC Sierra 1500 have?

Regular Cab SL 2WD. The 2002 GMC Sierra 1500 is available in Regular and Extended Cab body styles, with your choice of 4WD depending on the model, in a variety of trims and configurations. Under the hood, the Sierra is equipped with a standard 200 horsepower 4.3-liter gas-powered V6 in base models.

How many miles does a GMC Sierra 1500 get?

However, everybody fell in love with the truck and it soon became our everyday go to truck. It has been on the road for 17 years, every day, 7 days a week. We have never had any major problem with it. In 2016, at 345,000 miles, we replaced engine and transmission. Today, we are pushing 420,000 miles.

When did GMC Sierra 1500 brakes need replacing?

It had 210,000 miles on it before the brakes needed replacing! Part of this can be attributed to the way I drive and maintain my vehicles. Don’t drive like an idiot and use Mobil One full synthetic changed regularly and your truck will last longer too.

What causes a car to idle rough at idle?

A clogged fuel filter stops the engine from receiving the right amount of fuel causing the engine to be rough idle. Fuel filters are often pretty cheap, and you can easily get the fuel filter removed and replaced from a nearby mechanic or do it yourself if you have some knowledge. 6. Dirty Air Filter

Why does my GM V8 engine misfire when cold?

Because, GM V8 engines are very prone to a rough idle and engine misfire when cold. The check engine light may also come on, with codes P0300, P0171 and PO174. But, as the engine warms up, the engine misfire or rough idle tends to go away; which seems confusing.

Is there an engine misfire code on a GM 4.8L?

Engine Misfire or Rough Engine Idle on GM 4.8L, 5.3L, 6.0L is becoming; more common and getting harder to diagnose. Because, GM V8 engines are very prone to a rough idle and engine misfire when cold. The check engine light may also come on, with codes P0300, P0171 and PO174.

What causes a Chevy 350 to backfire when idle?

If a main vacuum hose such as the power brake booster feed line has broken or failing off it will cause a lean backfire due to the additional air allowed into the engine intake manifold. This problem will be accompanied by high or low engine idle and a harder to push brake pedal than normal.

What causes a GMC Sierra 1500 to stall?

GMC Sierra 1500 Questions – rough idle, stalling, loss of power. – CarGurus.ca rough idle, stalling, loss of power. Replaced: coolant temp sensor, tps, map sensor, fuel filter, and o2 sensor. It will run normal on occasion but only lasts about 45 seconds or so.

Where is the idle control valve on a Chevy Vortec?

The idle control valve sits on the throttle body and is responsible for adjusting the amount of air that enters the engine at idle, ultimately controlling engine idle speeds. At idle, the valve blocks a small amount of air from entering the engine, keeping idle RPM’s low.

Why is my GMC Sierra running rough at idle?

These packs are fired by the engines computer at exactly the right time to provide the optimal ignition timing. If a coil pack goes bad, it’ll cause a misfire and rough idle condition. Really, your Sierra will be running rougher at any RPM, but a misfire will be most pronounced at idle.

What should the idle rate be on a 1997 GMC Truck?

Underdog, I don’t know the 1997 5.7, but 1000rpm sounds like a high idle, not where it should “bottom out”. A V8 should idle at 500rpm. GoNDown, did you recently disconnect your battery? After I left mine dead in the yard for a while and didn’t charge it, when I started it up it ran like you describe for a few days and then it was fine.

What’s the idle RPM on my Chevy Suburban?

My 1997 Chevy Suburban (5.7) is acting up on me. When I start it up the RPM and idle seem fine. As I let it sit for a couple of seconds the RPM’s slowly begin to drop until they finally bottom out at about 1K. As soon as I put it into Reverse/Drive etc. the RPM’s drop below that mark and it struggles to stay running.

What should the idle speed be on a GMC V8?

A V8 should idle at 500rpm. GoNDown, did you recently disconnect your battery? After I left mine dead in the yard for a while and didn’t charge it, when I started it up it ran like you describe for a few days and then it was fine. I think it was doing a crank relearn (I no longer remember why I came up with that theory, though).

Why is my 5.3 L missing and rough idle intermittently?

5.3 L Missing and Rough Idle Intermittently I have changed Spark Plugs,Wires ,Coil Packs, and removed Fuel Injectors and soaked overnight. Engine code is a P0304. Misfire Cylinder #4. Most of the time around town is alright. When i put it on highway, it will surge like its cutting off and then pick right back up and be fine. Fuel Presure is 55 psi.

But the stable idle won’t last long, it’ll idle low and rough. Mpg has decreased drastically and give off a rich smell when running. 308 people found this helpful. Bad hesitation off of the start, pumping the gas pedal helps to get her going. Pushing the pedal hard well bog it out and almost stall. 290 people found this helpful.

What was the problem with my GMC Sierra 1500?

Did have one cracked vacume line from the throttle body to the purge solenoid, also replaced. Seems to have plenty of vacume through out the system. Removed and inspected the egr valve, no excessive carbon build up and appears to be working properly, good vacume going into the solenoid, replaced the solenoid just for good measure.

Why is my Silverado Sierra sluggish to accelerate?

Have a KN intake system on it and keep it clean so I dont think that is it but I havent really done anything else as far as modifications. After accelerating it feels like it starts to let loose and eventually seems to get up to speed. Any ideas of what I can do? Get a custom tune. I would get an exhaust of some sort to help with the tune.

What causes a GM truck to lose power?

If your GM truck occasionally loses the ability to accelerate and warns you of reduced engine power, that could be caused by a faulty throttle body. While not common, this issue can interfere with your engine function and cause your vehicle to lose power anywhere from once in a while to several times in a day.

Why do I lose power on hills GMC Sierra 1500?

2000 gmc sierra 4.3 shows lean feul but can not find how or where to look 4 people found this helpful. my 2000 sierra starts good and ideals good the only thing that shows up on the scanner is the fuel is lean everything else shows good pls help 3 people found this helpful. Bad spark control module people…….that’s the problem….

What does a GMC Sierra 1500 idle like?

Today experienced a poping sound almost like a backfire from underneath. After the truck starts and is warm at a stable idle in park/neutral it’ll rev up fine. But the stable idle won’t last long, it’ll idle low and rough. Mpg has decreased drastically and give off a rich smell when running.

When does a Chevy Silverado have no power?

If you put it to the floor, it won’t rev beyond 4000 RPM. At ~2500 RPM with only enough throttle to maintain speed (transmission manually shifted to 3rd gear), it will surge and hunt. In OD at 55 mph (engine speed below 2000), it runs smoothly but has no power to run up hill or into a head wind.

Why does my Silverado not Rev at 4000 rpm?

At 1500 RPM, it puts up 20-21 in-hg of vacuum. At 3000 RPM, it puts up ~18.5 in-hg of vacuum. It will not rev above 4000 rpm sitting in park!! If I apply more throttle, the revs will actually drop to 3800, as if a load were being applied by a dyno, and the engine will start to ping.

What was the problem with my GMC Sierra?

August 2007, Brought truck into dealership and they figured it was a weak fuel pump and was replaced, September 2007 stalling of engine continued. NOV. 2007 dealership replaced ignition harness, and stalling continued. Dec. 2007 I replaced the battery and did a thourough cleaning of the battery terminals.

Why does my Chevy Silverado lose engine power?

Keep reading to find at least one possible answer to “Why is my Chevy Silverado losing power?” Read More: How Can You Tell If Your Pickup Is Overloaded? If your GM truck occasionally loses the ability to accelerate and warns you of reduced engine power, that could be caused by a faulty throttle body.

If so pull the air filter off and sniff the throttle body for a fuel smell. If the diaphragm has ruptured it will literally be like putting a hose with fuel into the intake and running it full.

What should fuel pressure be in a GMC Sierra 1500?

I assume there really is no way of testing the the regulator itself considering it’s incorporation. 38 people found this helpful. The test is: 12-15 psi when the key is turned on and the pump will shut off within 3-5 seconds and the fuel pressure should drop to 12-13 psi. 11 being the bare minimum and 13 the Max.

What causes a rough idle or a ses?

A Rough Idle or a SES can sometimes be caused by a change in the throttle body position sensor calibration. To correct any accidental changes in throttle body calibration, use these procedures to recalibrate. Note: These procedures are a little tricky to do. You must get the timing just right Use a stop watch to help the precision of your timing.

What’s the idle speed on a Silverado truck?

So my idle was somewhere between 1000-1500 rpms. I unplugged the battery for a few hours and it dropped to around 800-900. After about a week of “relearning” it was back down to 500-600. Oops… Sorry for the pointless post. ^Didn’t realize you had already figured it out.

What to do about GM 4.3L V6 engine noise?

1. Remove the engine front cover. 2. Remove the crankshaft sensor reluctor ring and line up the timing marks on the crank gear and camshaft gear. 3. Remove the camshaft gear and chain. For model years 1996-’98, removal tool. 4. Pull the shipping pin and discard.

Where does the knocking noise come from on a 4.3 Vortec?

If a knocking noise, piston or crankshaft related problem. Attached is a web site that you can listen to a piston slap which is a known issue for your 4.3. Listen to the noise and see if it sounds similar to your problem. A piston slap will generally sound as though it is coming from the central area of the engine.

What kind of engine noise does a 94 Silverado make?

I wanted to add my recent experience to this thread…I recently purchased a 94 Silverado with the 4.3L balance shaft design. 139k miles and 180psi on all cylinders. Loud rattling noise just over 1K rpms.

What are the issues with a GMC Sierra 1500?

It made me realize some small preferences for the next vehicle, such as: having crew cab with four doors instead of the extended cab. The main issues encountered were: antilock brakes, window motor failure, signal lights always blown, and easily broken center console. The truck has been reliable, comfortable, and not too noisy.

Why does my GMC Sierra k1500 not move?

1995 GMC Sierra k1500, 350, 5.7 Automatic : Take it out of park, into drive or reverse, step on gas, rpm’s fly, but won’t move an inch. Have not driven in a week or so, had to replace radiator because of leak, replaced radiator yesterday and it works fine.but now get no movement at all when out of park.

What kind of idle does a GMC Sierra have?

After the truck starts and is warm at a stable idle in park/neutral it’ll rev up fine. But the stable idle won’t last long, it’ll idle low and rough. Mpg has decreased drastically and give off a rich smell when running.

How to reset the idle speed in a GM TBI?

Unplug the IAC valve located on the passenger side, rear of the throttle body. Start the engine. Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier. Turn the screw to adjust the idle speed to 650 RPM +/- 50 RPM.

Why is my GMC Sierra 1500 stalling and dying?

There is no code given. Have changed the injectors, timing, fuel tank, fuel pump, fuel pump, map sensor, cooling temp sensor on front of block, rebuilt the tbi, air idea valve. None of this hasite helped. The truck starts and dies. Have to give a little gas to keep running. While driving have to 2 foot it so it won’t die.

What’s the difference between a GMC SLT and a SLE?

Vehicles equipped with the SLT package have a CD player and a power driver’s seat, whereas the SLE models generally do not. GMCs with the SLE package typically come in the 2-wheel-drive variety. In addition, they come equipped with a V6 engine; however, a V8 is available at additional cost.

What makes a 1988 Chevy 5.7 TBI run rough?

1988 Chevy 5.7 tbi runs rough cold and…. Ok here is the deal. This truck has a good motor but it lacks power all the time not like barely moves but it won’t burn rubber. Now when its cold it runs really rough coughing and sputtering.

What are the features of a GMC Sierra 1500?

Key Features: 1 Industry-first use of carbon-fiber composite in a pickup bed 2 World’s First Six-Function GMC MultiPro Tailgate 3 Accessory MultiPro Audio System† (21) by Kicker ® 4 Available 3.0L Duramax ® Turbo-Diesel engine with 10-speed automatic transmission or available 6.2L V8 Engine

How old is the 1985 GMC Sierra Classic?

1985 GMC Sierra Classic, 1/2 ton, 4×4 with 6.2 Diesel. Family has owned this truck since it was new, first 30 years spent in eastern Colorado, last 5 years in Iowa. Last 5 years has seen the foll…

What should I do about idle stalling issues?

Pulled the injector and when i turn the key it sprays a lot of fuel, but the spark plug is dry. What would be my next step? Valve adjustment?

What causes the idle speed to go up or down?

The idle air control valve is programmed to regulate and maintain the engine idle speed at a constant rate. If the valve fails or has any issues it can cause the idle speed to be thrown off. This may result in an unusually high or low idle speed, or in some cases a surging idle speed that repeatedly climbs and falls. 2. Check Engine Light comes on

Why does my scooter stall out when idling?

And the obvious question, is your scooter stalling out when idling? If the answer to any of these questions is yes, they are all symptoms of your engine valves being too tight. Engine valves tighten over time after extensive use.

Pulled the injector and when i turn the key it sprays a lot of fuel, but the spark plug is dry. What would be my next step? Valve adjustment?

Can a bad idle control valve cause stalling?

3. Engine stalling The idle control valve, also commonly referred to as the idle air control valve, is an engine management component that is found in one form or another on the majority of road going vehicles.

What causes a power loss on a 60 series engine?

If the fuel pressure is high, I would suspect a plugged fuel filters or faulty fuel pressure regulator. If the guage is really bouncy, and unstable, especially under boost, then compression could be leaking past the injector o-rings. Or air is getting in the fuel somehow. Which you eliminated the suction line by going straight to the fuel tank.

Is there a power loss on a Detroit 60 series?

I have a power loss… I have a power loss on a Detroit 60 series engine its in a freightliner classic 2003.

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