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Prev Professional Automotive Repair Technical Discussions for August 31, 2005
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Open Help Requests for GM
Help Request Answers
2001 Buick Century Custom 3.1L MIL Lamp on VIN: 2G4WS52J31
vehicle came in for check engine light on and fuel gauge reading erratic . codes po 452 fuel tank pressure sensor circuit low voltage and po462 fuel level sensor circuit low voltage . vehicle has been to the dealer for same problem multiple time in the past ye... Trouble codes: P00, 452 (fuel tank pressure sensor circuit low voltage), P00, 462 (fuel level sensor circuit low voltage)
1997 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y6V
Hello all, I have this deville in here that I just put a fuel pump in and now the vehicle won't start. The original complaint was the vehicle was hard starting after sitting for awhile. I tested fule pressure and it was dropping to 0 psi in about 1 minute. So ...
1978 Chevrolet C30 Cheyenne 7.4L starter VIN: 1GTDC14C2C
this truck is a frankenstein, it has diffrent body parts and axels and is 4+4 now to. the prolem is the starter dont engage the flywheel all the way and it wears out the bushings in the starter and it grinds badly. looks like the correct flywheel (7.4) and im ...
1985 Chevrolet Camaro Berlinetta 5.0L Excessive Emissions, Misfire, MIL Lamp on VIN: 1G1FP87F3F
Hello to the group. I have an 85 Camaro with the 305 Tuned Port Injection that runs extremely rich at all speeds with moderate to heavy misfire due to the rich mixture. The MIL is flashing continously while the engine runs, (not flashing a code, just a rythmic...
1987 Chevrolet V10 Custom Deluxe 5.7L Poor Idle Quality, Surge VIN: 1GCEV14K7H
Okay, I am stumped with this one, probably overlooking something simple but I have or think I have covered all of the basics. This engine will not idle normally about half of the time. I began by doing some scope tests on the ignition and running a cylinder ba... Trouble codes: 44 (Lean exhaust)
1992 Chevrolet K1500 Cheyenne 5.7L Ping VIN: 1GCEK14Z2N
Anyone out there know of an EGR valve, or maybe a PROM that will address a light throttle ping on this Chevy pickup. The trouble is that it has a free flowing exhaust with no catalitic converter, the back pressure isn't enough to open the EGR valve, so we get ...
1993 Chevrolet K1500 Cheyenne 5.7L Poor Idle Quality, Stall VIN: 1GCEK14K9P
This rig came to me after being at another shop. It stalls at idle with the e.s.t. wire connected, will stay running above about 1200 R.P.M. and will idle with e.s.t. wire disconnected. Previous shop replaced distributor, (twice), e.c.m. and prom, (twice), ign...
1994 Chevrolet Corsica 3.1L RR speed sensor VIN: 1G1LD55M7R
Hey all, thanks in advance for any and all help. I have this Corsica here that has an ABS light coming on. We did a rear brake job on this car a month ago, and it is back with the customer complaint mentioned above. The code is 28- right rear excessive acceler...
1995 Chevrolet K1500 5.7L oil level VIN: 1GTEK19KXS
Hello techs. This vehicle is a service writers at our shop. She has had the vehicle for a long time. It has always used about 1 quart of oil in 3000 miles. On the last oil change she decided to convert it to synthetic. I have always been a big fan of synthetic...
1997 Chevrolet Lumina 3.1L Hesitation VIN: 2G1WL52M4V
Hi all , I have this Lumina which decides to bog out completely at it's leisure.I have checked fuel pressure which is within spec,when it acts up it feels as if the exhaust is plugged.I changed the catalytic converter and it seems to be acting up less often bu...
1997 Chevrolet Astro 4.3L Cam sensor circuit VIN: 1GNDM19W3V
Hi All, I got this electrical is driving me up the wall! Replaced an alternator for customer,the following few days customer complianted that the Check Engine light is on. Pull a code and found cam sensor circuit malfunction. Fuse for the cam sensor is keep...
1999 Chevrolet K2500 5.7L Misfire VIN: 1GCGK23R0X
The truck has an intermittent misfire sometimes when it comes off idle. The Snap-On scanner shows misfire data on the left bank only(Cyls 1,3,5&7). We ran some injector cleaner through the system and the misfire is still there. The problem is that when ever we...
1999 Chevrolet K1500 Suburban 5.7L trasfercase VIN: 3GNFK16RXX
HI MEMBERS I have a 99 suburban 4x4 that refuses to go out of 4wd has code co323 trasfercase lock circuit, low vehicle wont go into 2wd or 4lo just 4 hi and autotrac, front axle actuater will disengage when 2hi button is pressed and will lock back in when vehi...
2000 Chevrolet Venture 3.4L harsh shifting VIN: 1GNDU03E1Y
I have A Problem with my fathers Chevy Venture. It experiences intermittent harsh shifting. If the trans shifts harshly when the car is started, it will continue to shift harshly until the car is turned off for several minutes. On restart, it will shift proper...
2002 Chevrolet S10 LS 4.3L instrument cluster VIN: 1GCDT13W42
vechicle come in for battery light on ,alt. gauge shows charging test alt ok check voltage and grounds to cluster check engine light on found multiple codes at first cleared codes and code u1255 and u1301 come up again fuel gauge,low fuel light on check engine...
1994 GMC Jimmy SLE 4.3L drive VIN: 1GKDT13W5R
this truck came in with an intermitant slip, it will be driving and shifting excelent, then after it gets hot, it will go into neutral, usually after i slow down then accelerate again, if i cycle the ignition key it will go in gear again. at first i thought it...
1996 Pontiac Grand Am SE 3.1L ets & abs VIN: 1G2NE52M2T
hi fellow techs,thanks in advance for any help.vehicle came in to my shop with complaint of traction control light on,abs light on,and ets light on. this is a intermittent symptom with no abs or traction control activated during test on dry roads.while in shop...
2001 Pontiac Aztek 3.4L all VIN: 3G7DA03E61
After the head gasket was finally done, got coolant and oil in and vehicle started to overheat. Looked over closer and found the heater core was plugged with sealer, backflushed the heater core. Let the customer take vehicle because it wasn't overheating anymo...

Fixes & Summaries for GM
Fix/Summary Answers
1973 Cadillac Coupe DeVill 7.7L Rear Lighting VIN: 6047R3Q278
Hello everyone and thanks. Thanks to Chris from CA who faxed me a diagram. This one, as all stated was a ground issue to the rear bulbs. They ground through the sockets and when i touched a ground jumper to the metal part of the sockets, they worked fine. I ra...
1993 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CD13B7P
well first thanks those of you thet honestly tried helping, those of you that only sent mail to say you helped some one SHAME ON YOU, as i stated this car failed nox but my egr system worked correctly except that under load it would not open unless you restric...
1990 Chevrolet Corvette 5.7L No Start, Poor Idle Quality, Stall, Misfire VIN: 1G1EG5W85L
I would like to say thank-you to the 10 who replied, There was actually three concern's with this one.The original no inj pulse was caused by the module, Did it just happened to fail during all of this??? Or have been damaged from the real culprit... The cul... Trouble codes: 41 (serial data), 54 (fuel problem).
1991 Chevrolet S10 4.3L Poor Idle Quality VIN: 1GCCS14Z2M
almost everyone said to check the fuel pressure. I have not done that yet. I will do that but sounds like that is probably the problem. Thanks for all the help.
1991 Chevrolet Lumina Euro 3.1L Noise VIN: 2G1WN54T2M
The Lumina came back with the same noise. All lines, filters, pulsator, regulator, locking fuel cap, pumps (from multiple manufacturers) have been replaced. Identifix could not help, either. Many thanks to all who tried to help. If I ever figure out what is ki...
1994 Chevrolet K2500 Cheyenne 6.5L Hesitation VIN: 1GCGK24F1R
3 replies indicating timing and fuel. The problem ended up being the prom. The 94 truck has different pump number 5068 than 95 and up 5521. When we asked for the updated prom, we thought we recieved the right prom. It turned out we had to ask for a 95 prom wit...
1996 Chevrolet Beretta Z26 3.1L No Start VIN: 1G1LW15M4T
Yes the vehicle was fixed. Most of the responses were suggested to replace the module which is what I thouhgt also. This is the first 3.1 out of 100's that I have seen with a bad module. I believe that the customer smoked this when his battery went bad and he ...
2001 Chevrolet Cavalier Z24 2.4L high idle VIN: 3G1JF12T61
Thanks a bunch.Replies recieved covered egr system and pcm/ground problems.Here's the trick,one should probably verify that the brand new ac delco throttle position sensor is indeed intact.We recieved a faulty tps and that sent us around in circles.New tps and...
2002 Chevrolet Silverado 2500 HD 6.6L no power VIN: 1GCHK23162
One reply said look at cat the truck did not come with a cat. Another reply said look for pluged exhaust it was clear. A third reply said check the fuel pressure relief valve on the drivers side common rail, the fuel pressure relief valve is not on the common ... Trouble codes: P1093, P1094.
1993 GMC Sonoma 2.8L clutch VIN: 1GTCS19R39
Hello Fellow Techs: I received over 15 responses and all were very helpful; they forced me to re-think our entire repair scenario. After removing the transmission we inspected the position of the release bearing anti-rattle spring (OK), the condition of the cl...
1998 Oldsmobile Bravada 4.3L Poor Idle Quality, MIL Lamp on VIN: 1GHDT13W2W
First, I want to thank everyone who wrote in with help. Nearly everyone said pull the heads(which is what I wanted to do in the first place). Pulled heads and found #6 exhaust valve slightly burned. Had machine shop freshen everything up and reassembled the en... Trouble codes: P0300 (Random Misfire).
2001 Pontiac Grand Prix GT 3.8L steering VIN: 1G2WP52K21
thanks to all those that replied but customer has not had any more problems with p/s. don't know what may have happened but there doesn't seem to be any problems now.
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