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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 23, 2004
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Open Help Requests for GM
Help Request Answers
1996 Buick Century Custom 3.1L MIL Lamp on VIN: 1G4AG55MXT
I'm at wits end. At key on egr pintle is at 0%at idle goes to 18 to 22% when egr is installed but when another egr is plugged in laying on engine and grounded will show 0% I also had this 2nd egr installed on vechicle while running at id showed 20% did not fin... Trouble codes: P1406 (egr valve pintle position)
1990 Cadillac DeVille 4.5L Excessive Emissions, Poor Idle Quality, Surge, Poor Fuel Economy VIN: 1G6CD5333L
when this came in from another shop the above checks and repairs had been done, i checked and it is very rich, my lab scope is kaput so i cant view now but scan data showed rich and big injection pw. integrator goes from 128 to 99, i cant find any vac leaks an... Trouble codes: 41 (cam sensor-)
1993 Cadillac DeVille 4.9L Poor Idle Quality, Misfire VIN: 1G6CD53BP4
car came in wif misfire needed major tune-up and some sensors replaced.runs great but at idle itll get a misfire.it has the grd. strap in dist cap.cleaned and checked grds at starter.added extra grd at back of alternator.its an intermittent miss.but it does mi... Trouble codes: 13 (o2 sensor), 22 (tps sensor)
1985 Chevrolet S10 2.5L plug in for panel VIN: 1GCCS14E2F
This s-10 has had someone try to rewire the dash panel plug for gauge cluster, now I have to rewire back to get the panel to work as original equiped. the problem is that none of the wiring diagrams from gm manual match the wires found in this truck, I am wond...
1994 Chevrolet S10 Blazer Tahoe 4.3L Poor Idle Quality, Stall VIN: 1GNDT13WXR
This Blazer has me and my colleagues baffled. Truck died while on the highway and was towed to the shop. Engine will start eventually but as soon as you give it gas, it dies right out. The truck barely idles and vacuum is only 3 inHg. Fuel pressure is within s...
1995 Chevrolet Blazer 4.3L Poor Idle Quality, Surge, Cuts out, Stall VIN: 1GKCS13WXS
idles rough, will not accelarate, back fires through tne intake manifold, acts like it is flooding or way out of time
1996 Chevrolet Cavalier Z24 2.4L Poor Idle Quality, Surge VIN: 1G1JF12T4T
i have tis cavalier driving me crazzzzzy!! car idles like it has a rev limiter at idle, idle surges up and down badly. pulse width goes to between 3.0 and drops to 0 with idle surge. at idle iac drops to 0 but i cant find any vaccum leaks yet. also knock senso... Trouble codes: P0507
2003 Chevrolet Avalanche 2500 8.1L 1->2 shift VIN: 3GNGK22G24
A customer of mine has imported a brand new Chevy Avalanche 2500. 8.1liter. After a conversion to right hand drive he has been driving the truck around for a few weeks. He noticed a sudden change in the 1-)2 shift quality. It went from a nice crisp shift to a ...
2002 GMC Sierra 1500 SL 4.8L Cuts out, Misfire VIN: 1GTEK14V22
Hi guys, I think im over-thinking this one. This truck has a stumble or cut out just above idle I replace the fuel filter, clean the trottle plate,swap mass air flows, ck tps sweep the only thing i see is that the fuel pressure seems low. 25-30, I tried runnin...
2003 Oldsmobile Alero GL 2.2L No Start VIN: 1G3NL52F73
Hello everyone. Sorry about the long post, but I'm trying to be thorough. This car was towed in as a no start and sure enough-crank but no start. Sound while cranking seemed a little odd to me like maybe a broke timing chain or something. Anyway, on with the t...
1998 Pontiac Sunfire SE 2.2L Cuts out, Misfire VIN: 1G2JB5245W
We have a posessed Sunfire in the shop. Cust states that car started hesitating at cruise, another shop billed plugs and wires, miss still there. Started on the car yesterday and alot of strange things going on. Scan showed no codes, ABS light on, no CEL, and ...
1997 Saturn SL2 1.9L Dashboard VIN: 1G8ZK5277V
This car came in a month ago with the sound of water running in the dash. It sounds as though the cooling system is low and there is air in the heater core. I checked the cooling system and added some coolant although the reservoir had a supply of coolant in i...
2000 Saturn LS1 2.2L Poor Idle Quality VIN: 1G8JU52F4Y
engine has fast (approx twice a second) surge in gear at idle at stop. no problems noted under any other conditions. occurs hot or cold... The worst beating I ever took was a quad4 in a Grand am. After installing a waterpump, the mechanical part of the chain t...
2001 Saturn SL1 1.9L Rack VIN: 1GBZH52801
We are trying to solve a squeak (very minor) in a little old lady's car. You can only hear it when car is warm, all accessories are off, and turning wheel. We have found the noise, it's coming from the seal at the top of the rack. We thought it was the lower s...

Fixes & Summaries for GM
Fix/Summary Answers
1984 Chevrolet Camaro 5.0L enfine
well after i finally got more time to work on the car whick is my car by the way. i found cylinder 4 had spun a rod bearing so iv got a vortec 350 im gonna put in and just forget about the 305 thanks guys
1996 Chevrolet K3500 6.5L No Start VIN: 1GBJK34FXT
i pulled intake back off and found the connector for ckp under pump. now truck starts easilt and ckp code is gone the timing code is their i just need to adjust timing this weekend.
1996 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13W8T
Unfourtunatly my customer does not want to pursue this problem (spend and more money) at this time. Some of the posting techs thought there had to be a miss but as far as I can tell from the GM section on this site, anything that would cause the engine to dece... Trouble codes: P0300.
1998 Chevrolet Camaro 3.8L Hesitation, Misfire, MIL Lamp on VIN: 2G1FP22K6W
Thanks for the help Paul [...],Paul from Oklahoma and all the other replies. With the information we recieved we were able to find a bad fuel pressure regulator. We replaced it and had no further problems with the vehicle. Trouble codes: P0300 (Engine Misfire Detected).
2001 Chevrolet Suburban 2500 8.1L MIL Lamp on VIN: 3GNGK26G41
Got 3 responses on this one, turned out to be corrosion inside the VCM. Thanks to Jeff [...] for hitting this one on the head! Trouble codes: P0342, P0343.
2003 Chevrolet Tahoe LS 5.3L Radio VIN: 1GNEK13Z33
Thanks to all who replied, all responses were helpful. This truck has been driving me nuts for weeks, it's great to have other suggestions. Upon following up on all the tips, I narrowed it down to the rear seat audio controller. Although it never gets turned o...
2002 GMC Safari SLE 4.3L battery light VIN: 1GKDM19X52
I have not had this van back to try the ideas on the replies you all sent. The owner is very busy and can't get it in for further testing. thanks for the help, I will try out the suggestions when I see it back here
1996 Pontiac Grand Am GT 3.1L anti-theft VIN: 1G2NW52M3T
1997 Pontiac Bonneville SSE 3.8L ride control VIN: 1G2HZ5215V
Thanks for your replies. Sorry about the delay, the customer is very busy and it is hard to get the vehicle back in. Come to find out, I was confused on the systems used on this vehicle, since it has both the electronic computer command ride system and rear en...
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