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Chevy Silverado and GMC Sierra Gasoline Engine Problems

399 messages,  Last post on Feb 04, 2013 at 9:24 PM

You are in the Chevrolet Silverado & GMC Sierra Forum.

What is this discussion about? Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Silverado 2500, GMC Sierra 2500, Chevrolet Silverado 3500, GMC Sierra 3500, Truck

Messages Page 1 of 40

#1 of 399 Silverado Low Idle Speed by swiederin

Apr 03, 2006 (11:42 am)

I have a 99 Silverado w/5.3L engine. The idle speed is too low. It gets as low as 430 rpm when I firsty put the tranny in drive and then the idle increases to a more acceptable level. There are no DTC's. This problem is most noticeable when you pull up to a stop. The engine rpm's get low enough to dim the lights and almoist stall the engine. The engine has 62k miles.

#2 of 399 Same Problem by chrisara

Jul 01, 2006 (9:17 pm)

I am have the same exact problem with my 2003 4.3. Did you find a solution to the problem? If so please email me.

#3 of 399 01 Silverado low idle & dim lights by fatboyntroy

Jul 30, 2006 (2:19 pm)

Ditto fellas, I just bought an 01 silverado 5.3L w/ 66,000 miles, and the idle adjustment is too low. I don't know what it should be,(my tach reads 200-400 w/AC on), but i know it shouldn't almost choke down at every stop (as well as the headlights dimming.)The thing is, its not a rough idle, it runs very smooth but just so low that it almost chokes, and surges when given gas.Some have suggested a vacuum leak, faulty ground, or ECM problems. Still looking for answers. All advice is greatly appreciated. Thanks

#4 of 399 Silverado low idle problem---solved!!! by fatboyntroy

Aug 24, 2006 (4:36 pm)

Hey guys, problem solved!!! A friend recommended I call his mechanic, and he told me the low idle was a common problem on these engines. Actually, the real problem is that the accelerator is sticking (although this is not as evident as the low idle; this is why you feel the surge, instead of a smooth acceleration. The low idle is a by-product of this problem). The problem is due to hydrocarbon (sludge) buildup inside the throttle body, and possibly the air flow sensor. He cleaned both (I assume with something like common carb cleaner?). Anyway, she runs like a charm now! I was amazed at the smooth transition of the tranny!!! This was because the accelerator was sticking & had nothing to do with the tranny. The tach has gone from 300-400 in gear w/ac compressor on (almost choking at stops) to an even 500 & idling perfectly. Just want to emphasize that you may not feel the accelerator sticking, but if you experience low idle, you may be surprised at the difference when you do this! He charged me $40 to do this but said the problem may recur in 25,000 miles & may need cleaning again. However, I believe these cleaning procedures may be covered in a Chilton's or Haynes manual. Hope this helps & good luck guys

#5 of 399 Popping Noise by mudding

Aug 05, 2006 (4:52 am)

#6 of 399 Popping Noise by mudding

Aug 04, 2006 (4:45 am)

I have a 2003 Sierra 2500 4x4. After the truck sets for about 20 minutes you hear a very loud "pop". The dealership has replaced the heat shield and that didn't fix the "popping". Any ideas???? Please........

#7 of 399 Re: Popping Noise [mudding] by obyone

Aug 04, 2006 (11:02 pm)

Replying to: mudding (Aug 04, 2006 4:45 am)
It's probably the exhaust contracting on cool down.

#8 of 399 Re: Popping Noise [obyone] by mudding

Aug 05, 2006 (4:52 am)

Replying to: obyone (Aug 04, 2006 11:02 pm)
It's much louder than the normal cooling down noises. It's a loud "pop" or "ping".

#9 of 399 truck engine rotates over than idles down until it shuts off. by sanchezggg

Oct 16, 2006 (5:28 pm)

#10 of 399 truck engine rotates over than idles down until it shuts off. by sanchezggg

Oct 16, 2006 (5:28 pm)

Having problems with my 2001 silverado 2wd. it rotates over and idles until it shuts off. I just changed spark plugs and they smelled like fuel. It ran for a bit longer with the new spark plugs but then died down.I was thinking about changing the fuel filter and cleaning the throttle body for build up. i was thinking of fuel system because it had been sitting the last 7-8 months because i just got out the military.

Messages Page 1 of 40

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