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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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The truck is a 1994 GMC Sierra 1500 truck w/approx 170K miles on it. I would appreciate any feedback on my problem... I have had emissions problems for a few years now as can be seen in the following emissions transcript... Emissions Inspection 6/4/2002 Hydrocarbons (HC) Inspection 5.3095 Requirement 2.7000 FAIL Carbon Monoxide (CO) Inspection 35.3126 Requirement 60.0000 PASS Oxides of Nitrogen (Nox) Inspection 0.4853 Requirement 5.7000 PASS Carbon Dioxide (CO2) Inspection 476.3944 Work Performed 8/2002 - Adjusted Timing to 0 TDC - Replace Oxygen Sensor  Catalytic Converter - Replace Spark Plugs - Replace Ignition Wires - Replace Distributor Cap & Rotor - Replace PCV Valve - Replace Air Filter Emissions Inspection 8/2002 Hydrocarbons (HC) Inspection 0.1880 Requirement 2.2000 PASS Carbon Monoxide (CO) Inspection 1.9014 Requirement 60.0000 PASS Oxides of Nitrogen (Nox) Inspection 0.0070 Requirement 4.2000 PASS Carbon Dioxide (CO2) Inspection 73.1697 Emissions Inspection 7/13/2004 Hydrocarbons (HC) Inspection 6.7361 Requirement 2.0000 FAIL Carbon Monoxide (CO) Inspection 62.4512 Requirement 60.0000 FAIL Oxides of Nitrogen (Nox) Inspection 0.3481 Requirement 4.0000 PASS Carbon Dioxide (CO2) Inspection 599.9200 Work Performed 11/2004 - Adjusted Timing to 0 TDC - Replace Spark Plugs - Replace Ignition Wires - Check and Clean Distributor Cap & Rotor - Replace Air Filter Emissions Inspection 7/13/2004 Hydrocarbons (HC) Inspection 4.6401 Requirement 2.0000 FAIL Carbon Monoxide (CO) Inspection 18.6279 Requirement 60.0000 PASS Oxides of Nitrogen (Nox) Inspection 0.2441 Requirement 4.0000 PASS Carbon Dioxide (CO2) Inspection 609.0446 Work Performed 11/2004 · Check and clean EGR valve. Valve seemed to be fine, but cleaned. - Two cans of GMC Top Engine Cleaner have been sprayed into carb and left to sit overnight for cleaning on two different occasions. Still notice low throttle, low RPM miss (seems to get worse as engine temperature increases). There is a slight hesitation upon acceleration from stop. I have no noticeable problems at higher RPMs. After engine warm-up and when truck is parked, holding the accelerator slightly so that engine revs around 700 900 RPM (a guess), the engine will stall, revs will decrease, engine will recover and surge back to 700 900 RPM, stall, and repeat in a cyclical manner. I'm hoping that someone can give me an idea as to what could be the cause of my problems...I have less than two weeks before my emissions re-inspection. I'll gladly reply if further info for diagnosis is required...Thanks |
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I Have a 2004 GMC Sierra 1500 shortbed with a 4.3L engine and about 15 miles on the truck. I drive 35 miles one way to work, mostly interstate. I am only getting a little better than 16 miles per gallon on the highway. I took it to the dealer for a chek-up, but was told thiat it was ok. Anyone have any suggestions on improving the gas mileage?
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Replying to: serra04 (Oct 25, 2004 6:12 pm) sososierra |
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Replying to: ricampbell5050 (Apr 17, 2005 2:24 pm) |
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| I don't remember it, but there is a formula for determining rpm based on gearing. Try a 4WD or hot rod magazine. They're always chaging tires and gears, might be an easy place to start. I don't think it'll make that big of a difference. Gaining 1-2mpg for the cost of swapping gears might take awhile to recover costs. I swapped in a lower thermostat in my Safari because my company van ran at 165 and out of the box my van ran at 195. I went through all the trouble and while it ran at 165, it didn't do anything to help the van that I saw. Just some food for thought. | |
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Replying to: neecer (Mar 25, 2004 11:12 am) Steve |
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| I have a 99 GMC 1500 5.3l with 96K & 3 annoying problems, 1, the service 4WD light comes on and goes off about once a week, 2, my cabin fan motor works only in #3,4,5 speeds, 1&2 seem to work only while driving. And 3, when it drops below 18 degrees it runs rough, SES light comes on, I turn off the truck for 15 minutes re-start and it seems fine but the SES light remains on for a couple of days. I have replaced the throttle airfoil, fuel filter plugs etc anybody experience this? Are there any quality brake pads on the market that will get this truck to stop faster than it does currently? Thanks, | |
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Replying to: yellowdog27 (Aug 29, 2004 9:51 am) It used to do it only while in OD, not in 3rd, but now it appears more often. I've tried to sustain the vibration, but it cuts in & out, like a fan turning off and on, or something trying to "kick-in". I tow a trailer with heavy equipment and want to get this fixed, but nobody seems to know what the problem is.
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Replying to: mikec8 (Mar 13, 2005 6:13 pm)
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| I have a 94 Sierra that has a loud clunk noise, It is usually right under the center of the cab part, I had the transfer case off and taken in for inspection but it turned out ok, Now the clunk is mostly right under the 4WD shifter and it moves the shifter back a little when it clunks, When you hold the shifter, you can feel it , Its like something hits it hard, Ok thats when its in 2WD, then when I put it in 4WD, the clunking is in the back, Does anyone have any ideas? Thanks, | |
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