What causes poor idle and stalling on a Silverado?

Carbon & varnish build up will cause poor idle. If after a cleanup you still have the problem have a tech check with a scanner. Engine hot in “D” IAC counts should be 15-30. Beyond the cleaning above, check for an air leak from either a vacuum hose off or a loose clamp, etc. between the airfilter box and the throttlebody.

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 causes a Chevy Silverado to run rough?

If an oxygen sensor goes bad, it can make your Silverado run too lean (or rich). A super lean running engine will often idle rough. Fuel Injectors. The fuel injection systems job is to atomize the fuel into fine mist.

Why does my 99 1500 run rough when cold?

Need a little help. I have a 99 1500 with 5.3L. When first started in cooler weather the engine misfires, runs rough. Then it will rev way up and back down to almost stall and sometimes it will stall and I half to restart the engine. After running for a while and the engine warms up it runs great.

Why is my Chevy Silverado running rough at idle?

Really, your Silverado will be running rougher at any RPM, but a misfire will be most pronounced at idle. Spark Plug Wires – While not every model and engine combination of vehicles today comes with spark plug wires (a lot are now coil on plug), if your Silverado happens to have them, they can go bad and cause a rough idle.

What’s the average idle speed of a Silverado?

In the last month, noticed that idle is lower than normal. In Park or Drive when stopped at a light, the idle gets pretty rough and stays around 300-400 or say and often stalls when turning a corner as well. Always have the A/c on as I’m in Florida. At speeds of 15 MPH up to highway speeds, all is good.

What to do if your Silverado is stalling?

There is a small hole in the throttle plate spray it in there. Load the engine up with the stuff and shut it off. Hook every thing back up, wait about 10-15 min then crank it up and give it a ride. Listen to me I hvae been fixing these trucks with this idle stumble and a/c inop since the electronic throttle body came out on the trucks.

Is there an idle air control on a Silverado?

Your truck doesn’t have an Idle Air Control since it has an electronically controlled, drive-by-wire throttle. One can get MAF cleaner at the auto parts store. Spray the tiny filament wires inside the MAF with the cleaner.

Why does my Chevy Silverado engine shut off?

If this only occurs after the engine is hot, it may be an electrical problem. When the engine is hot, two things occur: (1) thermal effect on connections – electrical connectors expand and dry solder joints or worn connectors may suffer poor contact.

Why does my Silverado stall at red lights?

Always have the A/c on as I’m in Florida. At speeds of 15 MPH up to highway speeds, all is good. A/C blows cold and engine runs fine. Stalling 10 times in 30 minutes, at red lights, etc isn’t normal though.

Why does my Chevy Silverado 1500 shut off?

Can anyone shed some light on this problem. After driving my 04′ Silverado 1500 all day without any problems, after the truck sat in the driveway for a couple of hours, the truck started right up, but then after about 10-20 seconds it shut off. It now continue to do this. It starts normally, but then shuts off.

What should I do if my Silverado Sierra won’t start?

Attempt to start the engine. If it doesn’t start then release the key back to the on position. Watch the security light. After 10 to 15 minutes the security light should turn off. Turn the ignition off and wait 5 seconds.

What should I do if my Silverado engine dies?

Update as of today: 1) the truck hasn’t started and kept running since last week. It only starts right up, then dies immediately. 2) I got a fuel pressure tester and the pressure is at 53 with key on, and maintains pressure when it starts (then dies).

What should I do if my engine idle is too hot?

Clean the MAF with the correct cleaner and do the same with the IAC and the port. Carbon & varnish build up will cause poor idle. If after a cleanup you still have the problem have a tech check with a scanner. Engine hot in “D” IAC counts should be 15-30.

What kind of engine does a 2003 Silverado have?

3. Anyone have a Real Picture of a 2003 silverado 5.3l engine bay they can make markings on to show where to disconnect or drill hole or do something to Properly inject seafoam without me causing any damage….

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 Silverado Sierra have high idle?

Cleaned the throttle body and went to put it back on and start it with out the intake attached to the throttle body. It idled funny so I shut it off.

What are the symptoms of a bad idle control valve?

$0.00 1 Irregular idle speed One of the most common symptoms commonly associated with a problematic idle air control valve is irregular idle speed. 2 Check Engine Light comes on Another symptom of a potential issue with the idle control valve is an illuminated Check Engine Light. 3 Engine stalling

What causes engine to stall at high idle?

The first issue is the high idle. The question is was that caused by a mechanical issue or an electronic issue. The 3 codes come from a higher idle condition that isn’t controlled. If the TPS sensor sees closed throttle, but a high idle with matching MAF/Map signals, it flags the codes.