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Prev Professional Automotive Repair Technical Discussions for April 5, 2005
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Open Help Requests for GM
Help Request Answers
1989 Buick Century Custom 3.3L No Start, Misfire VIN: 1G4AH51NK4
vehicle was driven in running very poor it backfires though the air filter and cranks like the timing is off, if the crank sensor is disconnected then it cranks fine.we took off the timing cover expecting to find a broken chain.all was fine and in good working...
1989 Cadillac DeVille 4.5L Poor Idle Quality VIN: 1G6CD5156K
Car Idles a little on the high side 950-1050 rpms but when put in gear it will idle around 750-850 rpm, no vacumm leaks, fuel trim 127, the problem is when you drive down the road at say 50 mph and let off the gas it will stay at 50 and very slowly drop. The T...
1994 Cadillac DeVille Concours 4.6L Poor Idle Quality, Hesitation, Surge, Misfire VIN: 1G6KF52Y3R
Desperated cadilac help needed, I got this car in with multiple problems, most of which are fixed, down to the one that is kicking my tail. I got a miss around 1500 rpm under load in gear, if egr is unhooked the miss goes away, it gets better , I have searche... Trouble codes: 56 (Input speed sensor problem found sensor bad rebuilt trans code gone), 39 (torque converter malfunction speed sensor prob. took care of this prob.), 36 (egr pintle pos. prob. cleared codes and this code wont return.), 94 (shift ratio A problem cleared codes and this code wont return), 110 (internal ecm problem L-terminal pcm fixed this.)
1998 Cadillac Catera 3.0L hvac blower VIN: W06VR52R7W
This vehicle came in with the customer complaint of battery going dead overnight. Found intermittant parasitic draw of aprox. 2 amps. Traced this draw to the hvac blower staying on,blower controller hot, blower barely running. There is voltage on the blower ou...
1983 Chevrolet K10 Suburban Silverado 6.2L No Start VIN: 1G8EK16CXD
the truck was involved in a wreck, the truck was burnt inside, and the complete harness is basically melted to the floor, owner found a 1985 chevy c10 to put driveline into, the 85 is gas, and no wiring harness diagrmas are readily available, for the conversio...
1992 Chevrolet K1500 Cheyenne 5.0L Poor Idle Quality, Surge, Stall VIN: 1GCEK14H5N
1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Surge, MIL Lamp on VIN: 1G1JC5242V
As soon as engine starts to warm up a little the idle surges up and down.Scanner shows injector pulse turning on and off.You can hear the injectors stop and start again with a stethoscope.Problem only occurs in park or neutral.Idle speed in drive is around 110... Trouble codes: P0507
1997 Chevrolet C1500 4.3L master cyl VIN: 1GCEC14W5V
truck came in with pulsation in front rotors and weak pedal, the pedal would go to the floor before stopping truck. we put new pads and rotors, new bleeder valves in calipers [stopped up], new rear wheel cyls cleaned and adjusted rear shoes [75% pad left] blee...
1997 Chevrolet Blazer 4.3L Stall, Misfire, MIL Lamp on VIN: 1GNDT13W6V
this blazer come to me with mil on with complaint of misfire @ bogging on accel another shop had replace fuel pump,egr valve @plugs cheked codes had ap0300 missfire.under accel engine would start bogging @ missing until it died .checked fp 50psi @idle held fp ... Trouble codes: P0300
1998 Chevrolet Astro 4.3L engine VIN: 1GNDM19W2W
Hi Group, Van has intermittent cranks and won't start, or starts and dies. Set code P1626 when it finally acted up for me. After three starts and dies, it started and ran and has not acted up again or reset the code. Also found cam sensor to crank sensor relat...
2001 Chevrolet Express 2500 6.5L Stall VIN: 1GCGG29F41
The van gets used by multiple drivers and not many of them speak english. it has stalled numerous times but re-starts right away every time.When it gets to the shop everything seems normal.Any help or areas to check would be much appreciated.
1989 GMC motorhome 454CID Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 721LK44399
I am having a problem with this motor home burning through the #8 spark plug wire boot. This problem first appeared on a 1500 mile trip, but only on the last 200 miles of a 400 miles leg. It started cutting out and possibly backfiring on accelleration, but idl...
1997 GMC Safari SLE 4.3L engine assembly VIN: 1GKEL19W5V
This is a request for ideas concerning the replacement procedure of this engine. I am looking for someone else that has been through this procedure before and can give me some ideas of things to look out for and helpfull ideas. According to the procedure lis...
2002 GMC Sierra 2500 HD SL 6.6L MIL Lamp on VIN: 1GTHK29182
I can delete the code with my scan tool and it may stay off for a day or two. I checked that the signal heater wire from the relay is hot when the MIL light is not coming on (like after I have initially deleted the DTC)I do not have a Tech II scan tool and wou... Trouble codes: P0540 (Intake Air Heater or Intake Air Heater relay)
1997 Hummer H1 6.5L blower motor VIN: 137ZA9031V
i know this has to be a simple system but i can't get any technical info on this vehicle at all. our mitchel lists a hummer h1, but it has little or no info at all. the blower motor will not work at any speed. there is no power getting to the blower motor, res...
1999 Pontiac Grand Am SE 2.4L codes b1001, b2965 VIN: 1G2NE52T1X
This vehicle seems to set a B1001 option configuration error code every few months. We have installed new BCM's from GM each time. This BCM comes configured when you buy it and can not be reprogramed. This vehicle still has all its factory options such as radi... Trouble codes: B1001 (option configuration error), B2965 (key in ignition fault)

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick Park Avenue 3.8L ride control VIN: 1G4CW52K4Y
I think this one is fixed, at least I haven't heard back from the customer that it isn't. Recieved 8 replys. John from Minnesota and Elias from Florida were in the right area of the repair. It was in the vent/exhaust circuit. After following the diagnostic pro...
1995 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W5S
Hello Everyone, This was a stumper. After checking and rechecking everything I took a leap of faith. What I believe was happening was the pintle on the injector was sticking intermittently. I replaced the injector assembly and vehicle has run flawlessly since....
1997 Chevrolet Lumina 3.1L OBD Test not ready VIN: 2G1WL52M6V
Hello to all ! First sorry for the long wait for the close, been on Easter vacation. All who replyed had good info, alot of them we knew of, and a couple showed a few good OBD web sites with good info. All was tryed on this vehicle, first we had 3 not ready's ... Trouble codes: P00, 341 (Cam sensor).
1997 Chevrolet C2500 Suburban 5.7L Cuts out VIN: 1GNNGC26RX
Thanks a ton to all who spent their valuable time to offer a hand. It ended up being the ECM. I updated my post that it finally shut down and would not restart for a few precious minutes. Long enough to verify voltage was present and there was no CHECK ENGINE ...
2000 Chevrolet Blazer LS 4.3L Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13W4Y
Thanks to all who replied! I replace the fuel pump and the engine idle presure jumped to 58 psi. Truck ran 100% better and all the ST and LT trim readings fell to to less than 5%+-. The O2 readings would latch rich every once and a while . I noticed the fuel p... Trouble codes: P0171 (lean b1), P0300 (random missfire).
1991 GMC C1500 Sierra SLE 5.7L delayed & harsh 1-2, 2-3 Shift VIN: 1GTDC14K1M
Thanks! The Throttle valve was stuck, bad enough that I had to pull valve body. Couldn't pull it out with a magnet. Cleaned, polished and reassembled. Works better than it ever has, according to my Dad. Thanks again!! This is a Great Group
1998 GMC Savana 3500 5.7L Cuts out VIN: 1GTHG35R9W
Thanks everyone for the quick response,I recieved 7 replies and Alek nailed it,I remove vcm and the the case was corroded and spilt in halve.Fuel pressure and volume both were good,speed sensor had been replaced and waveform was good,wiring harness appeared ok...
1999 Pontiac Grand Am GT 3.4L Starting VIN: 1G2NW12E2X
Well after much hesitation, we installed a new ecm, and had it reflashed. I kept the car over the weekend and drove it myself. Not one problem starting. MOnday I gave it back to the customer and so far so good. I had many reply about trying a different key, ho...
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