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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 2, 2007
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Open Help Requests for GM
Help Request Answers
1993 Buick LeSabre Limited 3.8L Poor Idle Quality, Surge, Cuts out VIN: 1G4HR53LXP
we have a 93 lesabre that is driving us crazy.when u crank this vehicle it idles poorly has a miss when u accelerate and vacum fluctuates fron 10 to 14 at idle,no codes in computer.other times u crank it it will run just as smooth as a new one but in a matter ...
1996 Buick Skylark Custom 3.1L Theft system VIN: 1G4NJ52M3T
Hi Guys I'm sure someone has run accross this. The car will start sometimes and not others. Have performed key learn procedure multiple times. Sometimes Theft light is not illuminated at all. Not even at prove out. Code 1629 stored in memory haven't had much l...
1955 Cadillac Sedan 390CID r12 VIN: 5562120017
I am looking for a R-12 Capacity for a rare bird; 1955 62 Series Sedan. This car has the Evap. in the trunk, Uses 2 large plastic tubes in rear deck to direct cold air into the headliner for distribution. 1959 is as far back as my books go. If anyone can help ...
1987 Cadillac Allante 4.1L Need vacuum diagram VIN: 1G6VR3179H
I need the vacuum diagram for this car and can't find it anywhere! Please help!!!
1930 Chevrolet 2 door coupe 5.7L Alignment VIN: 1A2B3C4D5E
I have a 1930 chevy coupe that is now a hot rod. It has no power steering and a rack and pinion has been installed. If anyone can send me the front end alignment specs I would really appreciate.
1972 Chevrolet El Camino 5.7L Fuel Gauge VIN: 1C80J2L521
I have good power and ground to gauge (12v) and sender (6.5v). Sender reads in range 90ohm full and 0ohm empty. I can open sender cicuit and gauge reads full, grounded reads empty. Ceramic resistor on back of gauge has 91ohms resistance. Customer supplied spar...
1985 Chevrolet S10 2.5L No Start, Cuts out VIN: 1GCBS14E8F
My sons truck cut out on him on the way to school, we checked for fuel & spark, got both, it will start and run for about 3 seconds and die out like it's running out of fuel,I can see the injector pulsing fuel, fuel pump comes on and I have power to pump up un...
1991 Chevrolet Caprice Classic 5.0L Poor Idle Quality, Stall, Misfire VIN: 1G1BN53EXM
Okay Guys this one has been a problem on and off for three weeks. I have checked all wireing and scan tool data is normal. This thing just will not idle unless you unplug the vacuum line going to the map.No I have not taken a manual vacuum pump to the map. The...
1991 Chevrolet V3500 Silverado 7.4L transmission VIN: 1GCHV33N3M
Hi guys and girls.I need help fast from all the GM trans techs.I am planning an engine swap in my own truck.I will be removing the gas hungry 454 and putting in a non turbo 1994 6.5 gm diesel with a mechanical inj pump.Now I have been told that I have to use t...
1993 Chevrolet Corvette 40th Anniversary Edition 5.7L Drive-axles VIN: 1G1YY23P4P
The car makes a squeaking or chirping noise from the right rear of vehicle. Noise is only on acceleration up to about 20 mph. When you lift off throttle noise goes away. Appying brake causes no change. Brakes pads were good and showed even wear, rotors were tr...
1996 Chevrolet Cavalier 2.2L starts & dies VIN: 1G1JC1248T
Vehicle will start & dies right away .p1629 VTD code is set in the PCM. Go through flow chart & says Pcm replacement .When I looked at VTD codes in the IPC there were 13 present(history codes none current) . I cleared all codes in both IPC & PCM. Then i tried ... Trouble codes: P1629
2001 Chevrolet Monte Carlo SS 3.8L lights VIN: 2G1WX15K51
The customer said he battery light would come on after sitting in the sun for a few hours then go off after driving a ways. Also the lights wouyld go off and on, on for a second then off for about 15-30 seconds, this would also happen in the shop with the key ...
2002 Chevrolet Impala LS 3.8L Surge VIN: 2G1WH55K12
No codes set, slight but definetly noticable surge or trailer hitching in over drive under slight load, I don't think it feels like trans, it has 165k, do they have problems with t/chain play between the 2 cam crank sensor?
1993 Geo Metro 1.0L Stall, Misfire VIN: 2C1MR246XP
Car back fires and will run very rough timing belt is okay checked. You move the time by the dist.and the engine runs better but not good the dist. can only be put in one way as far as we can tell.
1993 GMC K1500 Suburban SLE 5.7L No Start, Cuts out VIN: 1GKFK16K5P
The problem i'm having is the truck ran fine. Then after it gets hot it cuts off. There's spark and fuel pressure. I have no injector pulse on either injectors. So my manager told me to install a re-man pcm. And still nothing. Any ideas would be greatly apprec...
2000 GMC Sierra 1500 SL 4.8L ignition VIN: 1GTEC14V5Y
Customer complaint is intermittent cranks but no start and won't crank. Checked battery and charging system-normal. Hooked up Tech II and found no body codes but found a P0336 crank position sensor malfunction code. Road tested and noticed a misfire. Did a cra...
2002 GMC Sierra 2500 HD SL 6.6L Starting VIN: 1GTHK291X2
02 GMC with a Duramax in it. Intermittently it will not start. NO CRANK. Sometimes if you hold the key in the start position, there is a delay, then it will crank and start. Other times, if you cycle the key it will crank and start. Occasionally it will take o...
1998 Oldsmobile Bravada 4.3L Power Steering VIN: 1GHDT13W1W
There is a honking type of moan (sounds like a goose) from the power steering that is heard cold only and only for the first couple of turns. I can get it to do it by starting the engine, and immediately twisting the steering wheel left and right quickly. Afte...
1993 Pontiac Bonneville SE 3.8L Steering VIN: 1G2HX53L8P
I'm the third shop to get this vehicle, and the owner is one of the Bluffton College baseball players that was in the bus that crashed down onto I-75 in Atlanta a month or so back, so I really want to fix this car for him. The problem we're experiencing is st...
2000 Pontiac Bonneville SSEi 3.8L Stability Control VIN: 1G2HZ5414Y
Customer has had this issue for a long time and got tired of the dealer throwing parts at it. We test drove the vehicle and found the stability control engauging traction control while turning into parking lots or steering the vehicle in a bit of an aggresive ...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick Regal GS 3.8L instrument panel VIN: 2G4WF5516Y
thanks for all the great advise. finally i was able to catch it in the act. the ignition switch was the fault.
1995 Cadillac DeVille 4.9L road sensing struts VIN: 1G6KD52B7S
Contacted GM dealer and obtained a relay and pigtail assembly to eliminate suspension warning on IPC.Thanks to all that replied!
1992 Chevrolet Step Van P30 7.4L Poor Idle Quality, Surge, Cuts out, Stall, Poor Fuel Economy VIN: 1GBKP37NXN
Thanks for all the replies. I reset the time and it took the surge out of it. With the history of this vehicle of running like crap after the timing was set I decided to replace the distributor cause the timing wouldn't stay set. There was a lot of play in the...
1993 Chevrolet S10 Blazer Tahoe 4.3L Poor Idle Quality, Very High Idle VIN: 1GNCT18W8P
First of all I want to thank all of you who replied. I will say it again. The techs here are the best in the world, and IATN is without a doubt the best tool I have in my shop. I made one of the worst troubleshooting errors a tech can make on this one. When I ...
1997 Chevrolet Astro 4.3L No Start VIN: 1GTDM19W4V
i had this one on the back burner.customer doesn't want to spend much money . any way i checked all powers and grounds at the computer all ok so i put a computein it without cust ok still no start. i'm running out of time with this post i have to close it with...
2001 Chevrolet Impala 3.4L Radio & lighting VIN: 2G1WF52E61
Thanks for the replies 1-reply from David too check if I had 1/2 of batt. voltage at left speaker wires to see if Radio is still alive. I disconnected data wire at radio and voltage dropped. I check BCM codes again and there was 18 codes and this time batt. ha...
2001 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J81
This job is fixed. As most of you suggested, the passlock cylinder was the problem. We changed it several days ago and everything is working fine. Thanks for all the help.
1993 GMC C1500 Sierra SLE 5.7L Poor Idle Quality, Surge, Stall VIN: 2GTEC19K9P
hey guys i am sorry i have not closed this one but it turnedout to be bad wiring from ect sensor,thanks for everything.
1995 Oldsmobile 88 Royale 3.8L oiling system VIN: 1G3HN52K3S
thanks everyone.while i dont have the motor reassembled yet i did find the place it was leaking.william and nicholas hit the nail on the head by reminding me about the rear cover plate. the 3.8 does not use freeze plugs on rear of block but a plate and gasket ...
1999 Oldsmobile Silhouette Premiere 3.4L MIL Lamp on VIN: 1GHDX03EXX
thank very much for the information about the vent and purge solenoid. but customer haven't back to shop yet. but i will post my fix soon customer back. thank you very much Trouble codes: P0440.
1993 Pontiac Bonneville SE 3.8L electric door locks VIN: 15P1238226
Got vehicle back in and checked relay per robert from michigan. found no power to relay. checked fuse and found blown. replaced and the door locks are working properly. checked several times over a few hours and all working normaly. Not sure why fuse blew but ...
2002 Pontiac Sunfire SE 2.2L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1G2JB12472
Thanks to everyone for your very timely responses. After checking wiring thoroughly we found ground wires loose in 2 different places at the back of the block. Everything working fine after securing these. Thanks again for the quick responses. Trouble codes: U1000 (no state of health from module).
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