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Chevy Silverado and GMC Sierra Stalling Problem

46 messages,  Last post on Aug 07, 2008 at 10:36 AM

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What is this discussion about? GMC Sierra 1500, Truck

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#37 of 46 03 GMC SIERRA 4.8 STALLING by lrichy3 Apr 12, 2008 (10:59 am)
I have 03 sierra that i bought new, for the last year and a half it stalls when i come to a stop or turning. It runs fine when it is cold. After it warms up the rpm's drop down to about 550 and it has a miss. It's driving me crazy!! I put new plugs and wires on it,checked the fuel pressure. It's fine.Put new K&N air filter on,the throttlebody is clean. It does not have an IAC valve they only had them up to 02,it has one big electrical unit in the side of the throttlebody and nothing else!! ANY HELP WITH THIS I WOULD REALLY APPRECIATE IT!!!! Replies to this message: mickeymouse2 (Apr 12, 2008 6:08 pm)
#38 of 46 Re: 03 GMC SIERRA 4.8 STALLING [lrichy3] by mickeymouse2 Apr 12, 2008 (6:08 pm)
Replying to: lrichy3 (Apr 12, 2008 10:59 am) Hmmm, sounds like its starving for fuel only when warmed up. Check the output voltage signal from your upstream O2 sensors. They should be switching back and fourth between 600-900 mili volts within 1 second. If you don't know how to do this try a propane enritchment test. Take a propane torch(don't light it) and give your engine some extra fuel (propane) when it is warm and see if it smooths out. Just put the end of the torch into the air intake. If it runs worse, than your problem is too much fuel. Look for vacum leaks, and exhuast leaks, these will fool your O2's into sending a lean signal to the PCM wich inturn dumps extra fuel in there. Too much for the engine to burn up.
#39 of 46 03 Z71 5.3 Low idle problem!! by gixxerman1981 Jun 07, 2008 (5:30 am)
I was having the problems that some were having on here with the truck stalling at low rpm maneuvers. It wasn't the alt or battery, I put a new fuel filter on, still nothing, finally i got some cleaners and cleaned out the MAF sensors and the TB, by the way was loaded with carbon build up. I haven't have any luck with finding the IAC valve though, its not bolted on the TB like most, unless it is attached, meaning riveted on the TB, however since the cleaning it has ran fine, the test drive around the block was a success! If anyone knows where and how to get to the IAC valve shoot me an email, i really would like to clean that as well!
#41 of 46 engine stalling when using blinkers by neelaviat Jun 12, 2008 (6:19 am)
Hey, I have 2001 Chevy 2500HD Duramax w/ 200,000 plus miles. It's been a great truck, but... engine stalls when I use the turn signal to change lanes on the highway, or when coming out of a slow turn when the blinker arm returns. I can't duplicate this by wiggling the blinker arm. I have to put truck in N, and usually restarts first try. I can feel the truck hesitate or bump while changing lanes on the highway (70-80 MPH) if it doesn't stall completely. THANKS for any help. No codes being stored.
#42 of 46 Re: 94 silverado stalls on idle [adam11788] by 2doorhoe Jul 18, 2008 (12:14 pm)
Replying to: adam11788 (Apr 03, 2008 3:28 pm) had the same thing happen, replaced the harmonic balancer ran like new Replies to this message: neelaviat (Jul 19, 2008 4:48 am)
#43 of 46 Re: 94 silverado stalls on idle [2doorhoe] by neelaviat Jul 19, 2008 (4:48 am)
Replying to: 2doorhoe (Jul 18, 2008 12:14 pm) Did you experience this while using the blinkers? Or idle? Thanks.
#44 of 46 2003 Sierra 1500HD by loom Jul 29, 2008 (11:49 am)
I have a 2003 Sierra 1500HD, 2 Days ago I went to start it and the battery was dead. I jump started it, never had problems with the battery sense. Now it idles very low when I start it and when I come to a stop, sometimes it stalls. I was told that it could be the iac valve, and then I was told that the 2003 models doesn't have one. Any replies would Help Thanks. Replies to this message: jaysgmc03 (Jul 30, 2008 5:33 pm)
#45 of 46 Re: 2003 Sierra 1500HD [loom] by jaysgmc03 Jul 30, 2008 (5:33 pm)
Replying to: loom (Jul 29, 2008 11:49 am) hey dont have a answer either but mine also did the same thing i boosted my atv off with my truck and ended up draining my battery in my truck and i got a new battery and now i have low idle to the point it wants to stall . so if u find a answer please let me know. i will do the same .
#46 of 46 2004 chevy 1500 stalling by hmann54 Aug 07, 2008 (10:36 am)
My truck has a 4.3 with automatic. trucks runs great after about a hour it will go to stalling. I have replace ign module, coil, cap plugs ,fuel filter..put the OBD2 scanner no codes show everything is great..fuel pressure from pump is 60 psi. I was told by tech from the dealership that some sensors do not read on obd2 with out service engine light coming on. if any has run across this or can point me in the right direction I would appreciate it

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