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Pickups Chevrolet Silverado & GMC Sierra Chevy Silverado and GMC Sierra Stalling Problem
73 messages, Last post on Oct 29, 2009 at 8:44 PM
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Replying to: jumlah (Apr 09, 2008 9:21 pm) Low idle than normal may be the key to this. Check fuel pressure, and throttle body for carbon build up. IAC (idle air control) valve may be malfunctioning and not setting a code(pintal may be stuck in wrong position) I have run into this after manifold has been removed. Pintal position will not set codes for IAC, only electrical malfunctions of the IAC will. Pintal spring may be coked with sludge, impeeding correct relearn proceedure. Recommend cylinder balance test. Verify each cylinder is contributing on its power stroke. If this vehicle was brought to me, this is where I would start. Keep in mind that my first rule to repair is to fix the obvious first, it might be related. I would focus on the low idle issue first. Even though timing has been checked, check it again by someone else. Timing cannot be accurately checked or set if your idle is below specs. Timing and idle are related. Your emission sticker under the hood will show the specs for timing at what idle rpm. Low idle retards timing, while a higher than normal idle advances timing. |
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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!!!!
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Replying to: lrichy3 (Apr 12, 2008 9:59 am) |
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| 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! | |
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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.
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Replying to: adam11788 (Apr 03, 2008 2:28 pm)
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Replying to: 2doorhoe (Jul 18, 2008 11:14 am)  idle? Thanks.
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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.
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Replying to: loom (Jul 29, 2008 10:49 am) |
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