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Prev Professional Automotive Repair Technical Discussions for March 21, 2006
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Open Help Requests for GM
Help Request Answers
1995 Buick LeSabre Custom 3.8L No Start, Stall VIN: 1G4HP52L85
this car sat on the side of road for sale and I towed it in repace the fuel and checked for pressur 35psi and jumps to 40 when the vac hose is off the regulater. It will start and run for 5 seconds but not stay running till you turn the key off and try to star...
1992 Chevrolet K2500 Cheyenne 5.7L speedo and tach VIN: 2GCFK29K1N
speedo and tach both bouncing in dash custer at idle speedo at idle says 65 to 85 mph tach goes to 5k rpm at idle replace dash panel twice already even cut tack wire at coil no change any help would be great
1993 Chevrolet S10 Blazer 4.3L No Start, Surge, Stall VIN: 1GHDT13W4P
this thing always has good fuel pressure even when it's actingup but it feels just like it doesn't it falls off under light load and surges badly. all the data egr map tps is good while it's acting up. the more you drive the worse it gets and the more sluggish...
1995 Chevrolet Camaro Z28 5.7L No Start, Stall VIN: 2G1FP22P9S
Hi, this vehicle was brought in with a complaint of intermittent stalling & no start. (supposedly it cranks ok) at first was unable to get it to act up but after an extended test drive it stalled while coming to a stop and indicated a code 48 maf circuit probl... Trouble codes: 48 (maf system fault)
1995 Chevrolet K1500 Cheyenne 5.7L oil pressure VIN: 1GCEK19KXS
This truck came into our shop with a leaking intake gasket. It was leaking oil on the front and rear of the engine. Not uncommon for a Chevy small block. The repair was made by another tech, and the engine ran fine, no noises or anything. The only thing is tha...
1997 Chevrolet Corvette 5.7L climate control VIN: 1G1YY22G9V
This corvette has split climate control for the driver and the passenger. The passenger side gets cold A/C , aprox. 55 to 60 degrees. The driver gets only aprox down to 75 to 80 degrees. The blend door for the driver side is not closed all the way. Whe...
1997 Chevrolet Monte Carlo LS 3.1L MIL Lamp on VIN: 2G1WW12M4V
i got a 1997 monte carlo with a mil on. checked exhaust for leaks and none were found visually checked egr valve,pintle,and passages no problem found.i can cammand the egr valve on and it works as designed. after replacement of egr valve and cleaning the passa... Trouble codes: P0401
1997 Chevrolet C1500 4.3L Mechanical VIN: 1GCEC14W6V
We just got this engine together and there is no wind in cylinder 5. I removed the valve cover and watched the rocker arms they are working good up and down, I then closed both valves and to a leak down test and the valves are seating, I dont have a clue on wh...
1998 Chevrolet Metro LSi 1.3L No Start VIN: 2C1MR5224W
Hi car will not start. has good spark. 2&4 flash noid light very bright. grounds power to pcm good. data looks good on scanner. has had 2 used pcms installed no help. cam and crank sensors good on lab scope. swapped cam and crank sensors and all '98 parts were...
1999 Chevrolet Express 2500 5.0L MIL Lamp on VIN: 1GCFG25M5X
Hello and help fellow techs, vehicle failed obdII emissions with a code p1345. We have replaced the cam sensor in the distributor, checked for timing chain play, and read scanner information which indicates that the is no more than one degree of difference in ... Trouble codes: P1345
2000 Chevrolet K2500 7.4L No Start VIN: 1GCGK23J45
This is my personal truck.I can let it set for days and it starts fine.Let truck set for 30 min to about four hours and it has aextened crank.Runs a little rough when started and has a small amount of black smoke.On one occurance when started hot cranked hard ...
1994 GMC G2500 Vandura 5.7L Poor Idle Quality VIN: 1GKEG25KOS
Thanks for your time. The van idles at about 1800 rpm. The scanner shows iac position at 150, as it wrms up it goes to about 99. I removed the iac valve and when I plug the hole with my finger, the idle drops to 700 rpm. The iac plunger is observed to move whe...
2004 GMC Envoy XL SLE 5.3L engine VIN: 1GKET16P54
Good afternoon to all. I have this 04 Envoy that has been to two GM dealers for a PO300. This truck has a obvious misfire at idle, worse when in gear. It seems to drive down the road OK. With scanner hooked up, I can watch cyl. no. 4 rack up the misfires. The ...
1995 Oldsmobile 88 Royale LSS 3.8L cruise is not workin VIN: 1G3HY5216S
it was a hystory code for abs switch, after clearing codes is no other than code p1565, brain resources are to the limit, need help, i have something missing and can't find it. thank you for your attention and help up front, jorge. Trouble codes: P1565 (servo position failure)
2002 Oldsmobile Bravada 4.2L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GHDT13S42
We still have a rough idle and code p0171 sets right after codes are cleared and run for 1 minute. The CEL comes on after the engine is shut off and restarted. Trouble codes: P0171, P0501
1994 Pontiac Grand Am SE 2.3L Coolant temp. VIN: 1G2NE153XR
A month ago the vehicle came in for an overheating condition. I found the waterpump bearings to have failed. I replaced the pump and all checked ok. The vehicle is back and overheating again. The customers brought in a thermostat. I replaced the thermostat. I ...
1998 Pontiac Trans Sport Montana 3.4L brakes VIN: 1GMDX03E1W
customer complains of lack of power, brakes dragging & hot smell. rotors show signes of being hot. no codes in abs or traction controll. symptoms have not appeared while in shop. calipers appear to be free. any help would be great. kyle
2001 Pontiac Aztek 3.4L No Start, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 3G7DA03E91
This vehicle came in with check engine light flashing rapidly and running so bad we could not hardly drive in what i noticed is when the fuel gauge does not work the trac light is on and says error on odometer and security light on, when you try to start somet... Trouble codes: U1000 (ipc loss of communication), U1016 (refers to module not commuicating which is the pcm)
1999 Saturn SL2 1.9L dash VIN: 1G8ZKS270X
Customer came in with a noise in dash sounds like swishing water. She brought it to the dealer and explained her problem they replace heater core... Still same problem. They gave-up or she gave-up on them... Anyway it is here. We put cooling system into vac st...
2001 Saturn L300 3.0L MIL Lamp on VIN: 1G8JW54R71
reacureing p0050 Trouble codes: P0050

Fixes & Summaries for GM
Fix/Summary Answers
1986 Chevrolet Corvette 5.7L ping VIN: 1G1YY6786G
Thank you all for your help. Ifound the ECM was commanding the timing to 42 deg.btdc at all times causing the ping. I replaced the ECM and computed timing droped to 24deg.btdc at idle and would retard with knock signal. Thanks again for all your help.
2000 Chevrolet Impala LS 3.8L Take off in 1st gear VIN: 2G1WH55K5Y
This being my own car will probably get put off until it fails. Thanks for all the responses. Almost everyone tells me that the pressure control valve is the culprit. I have also been told to go ahead and have my tranny shop go into the trans based on the mile...
2000 Chevrolet Monte Carlo SS 3.8L torque convertor clutch VIN: 2G1WX12K9Y
I talked to my rebuilder today and he informed me that they did install a sonnaxx tcc regulator valve kit, and a new tcc pwm solenoid also. I want to thank James who hit it on the head by doing a reprogram. I drove the car this am and monitored the vss, tcc %,...
2002 Chevrolet Astro 4.3L Fuel gauge VIN: 1GCDM19X52
Thanks for all of the replies. I put in a new fuel sending unit and everything is great.. I bench tested the old one. The contacts are worn down real bad causing the fluctuation.
2002 Chevrolet Trailblazer LS 4.2L throttle VIN: 1GNDT13S02
Sorry for the delay, we are not positive this one is fixed.When customer brought the truck back we did all the service per responces. Wire harness under brake booster OK. Heated PCM with heat gun no failure. Rechecked values one sensor increases while the othe... Trouble codes: P1221, P1271, P1635.
1998 GMC Jimmy Envoy 4.3L Heater System VIN: 1GKDT13W3W
Many thanks to all that replied. It seems there are two systemic problems with these cooling systems - Dexcool clogging the system and difficulty purging the air from the cooling system. Not only was the use of a cooling system evac tool a recurring theme, but...
1999 GMC K2500 Sierra SLE 5.7L Poor Idle Quality, Surge VIN: 1GTGK24R3X
Customer picked up vehicle and took to original shop work had been performed. We did clean throttle body, reprogrammed IAC motor(which had been replaced previously by another shop)...vehicle ran much better, but still acted up.
1987 Oldsmobile Cutlass Ciera LS 2.8L Excessive Emissions, Poor Idle Quality, Surge, Poor Fuel Economy VIN: 2G3AJ51W1H
ok after reading all replies, i came to the conclusion i had a vac. leak somewhere. since i dont have a smoke machine, i ended up re-zeroing tps, getting throttle % some what normal, then staring the engine only to have out of control high idle, blocked off tb... Trouble codes: 44 (lean exhaust), 33 (map signal high).
2000 Saturn LS2 3.0L MIL Lamp on VIN: 1G8JW52R2Y
I thank Bill [...] for their suggestions to check the wiring and connectors for the PCM & TCM. I found no retracted wiring terminals in any connectors and all connections were clean & tight. Also, gratitude to Alan Nagel. He wri... Trouble codes: P1780 (ECM not sending required information to TCM).
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