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Pickups Chevrolet Silverado & GMC Sierra GMC Sierra: Problems & Solutions 
1492 messages, Last post on Oct 12, 2006 at 5:32 AM
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Replying to: wolfdog (May 12, 2005 12:33 pm) I had one hit indicating that it could be the fuel pump going out...I had the gas tank off a year ago to replace the brake line and had to take the pump off because I broke the ground lead and had to drill through the plastic electrical housing to resolder the lead...coincidence? I did replace the gas filter and that did not solve my problem. I haven't replaced the fuel pump as of yet... Now, I have taken a second look at the EGR valve. I took it off and cleaned it and tried to make sure that it was closing at idle. I didn't see any problem with it and stuck it back on. However, recently I disconnected the vacuum line, stuck a golf tee in the vacuum line and have been running it around and have noticed that my surging has cleared and the truck is running well. At highway speeds, after warmup, the Check Engine light comes on as expected, but the truck runs fine. My assumption at this point is that the EGR valve is spring loaded and lost enough of its closing strength that the small vacuum present at idle is enough to keep the valve open and cause the stumble I am seeing at low throttle. At least I hope it is because I'm going to replace it shortly... Another thing that has come to mind is that possibly there is too much vacuum at idle, indicating a malfunction of the EGR valve vacuum solenoid...It's probably the EGR valve because it takes alot of abuse in the form of heat and it is the original. Unfortunately, I don't have a vacuum gauge to give a definitive analysis. Good luck...
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I own a 1998 gmc sierra extended cab 2wheel drive. Which has developed a vibration that no one can pin point. It seems to be comming from down in the under carriage or drve train not sure.. All u-joints and carrier bearing and tires have been checked. ??
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Replying to: dhealey05 (May 18, 2005 3:26 pm) If that aint it, I've always been suspicious of that EVO switch for the steering. They go bad very frequently on these trucks and when they do, they sometimes make it do some really weird stuff. Mostly the steering is affected, but I just don't trust it - wish they never put it on the vehicle. - Tim |
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1. I was wondering if anyone has heard a gurgling sound/ rattle coming from the dash area(passenger side more). It only occurs when truck is under load in 1st, 2nd, 3rd gear, you don't hear it in overdrive. When the truck is cold and the engine temp hasn't heated up the noise is not heard either.. 2. Anybody have problems with the digital odometer reading going off. If you bang the console sometimes it will come back on.
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Replying to: bip44 (Feb 17, 2004 11:55 am) |
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Replying to: 99launch (Mar 30, 2005 8:05 pm) |
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Replying to: jimmy05 (Mar 27, 2005 5:48 pm) |
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Replying to: nspidell (May 08, 2005 8:59 am)
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I have a 2000 GMC 1500 EXt CAB 5.3L 4X4 Z71. I recently went to start my truck and nothing electrical was working. I tried getting it jumped but nothing worked not even interior lights. I brought to dealership for service and they said it was just battery. They explained that once the battery got below 9 volts the computer shut down everything. It seems to be working but I was wondering if anyone else has had this happened to them.
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