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Prev Professional Automotive Repair Technical Discussions for November 14, 2006
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Custom 3.8L Surge, Stall VIN: 1G4HR5219R
test drove, once when started ran rough, then smoothed out and drove normally. check codes no mil on, found p0101 mass air flow failure, check circuits to mass airflow, power and grounds were in spec. signekl dropped out at times when checking with an avantage... Trouble codes: P0101 (mass airflow failure)
1995 Chevrolet K1500 Cheyenne 6.5L Stall VIN: 2GCEK19SOS
HI Folks,Have a 95 diesel with an intermittent stalling problem.Can go for days without stalling,then stalls many times in a day,only when driving.Customer states that it always restarts right away.After reading many posts on diesel stalling I suspected a fuel... Trouble codes: 36 (inj.p/w long response), 35 (inj.p/w short response), 32 (egr sytem problem), 44 (egr p/w error), 49 (serv. throttle soon lite error), 57 (pcm 5 volt shorted)
1995 Chevrolet C2500 7.4L MIL Lamp on VIN: 1GCDC14NXS
Thank you for reading my post. I have not asked for help since 1998. This sounds like a confession! This truck has no mph reading when scanning on the engine side of the computer. It always has mph on the transmission side and speedo always works. This transmi... Trouble codes: 16 (speed sensor drop out)
1997 Chevrolet Tahoe LS 5.7L battery VIN: 1GNEK13R5V
Hello fellow techs i have one here that been here almost 2 months ago for dead battery now its back .initialy 2 months ago vehicle came in for dead battery checked for parastatic draw and traced it down to transfer control module , replaced module and it was a...
1999 Chevrolet Express 3500 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCHG35R9X
The check engine light just came on prior to the running problem which is it stalls out, runs rough or the vehicle will all of a sudden idle at 3000 rpm. When you step on the throttle she will pop back slightly and bog down. MAP checks out at 2.7 to 3.7 volts ... Trouble codes: P0102, P0118, P0121, P0123, P0338, P1115
2001 Chevrolet Suburban 2500 8.1L Stall VIN: 3GNGK26G21
vehicle stall when it want going down road. it might start right back up or it may take 10 to 15 tries
2002 Chevrolet Impala 3.4L compressor VIN: 2G1WF52E82
Compressor is not coming on intermittantly. (only when customer has car) Ran it for 3 hours in the shop, w/ gauges and scan tool (Tech. 2)Everything was " operating as designed" until I returned the car to the customer.(Sound familiar?) When it came back, scan...
2003 Chevrolet Cavalier 2.2L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1G1JC52F13
The first time the vehicle came in it had multple cyl. misfires. checked and found #2 & #3 misiing spark. checked allsystems and replaced ba plugs and coil pack and boots. a month later vehicle came back with same problem. Checke again and found no signal from... Trouble codes: P0300 (multiple cyl. misfire)
2003 Chevrolet Suburban 1500 LS 5.3L MIL Lamp on, P0315 VIN: 3GNFK16T83
after replacing pcm per related repair history, find unable to perform crankshaft variation relearn procedure. rpm's went above cut point (5,000+). cut point is 4,000 rpm. code p0315, crankshaft position relearn not learned, is set immedately with the key on e... Trouble codes: P0315 (crankshaft variation not learned)
2003 Chevrolet C4500 Kodiak C4C042 6.6L speedo sensor VIN: 1GDC4E1123
this problem is for all the big truck guys, after my tech replaced all of the injectors the speedometer started reading double the actual speed. when we hook up the ease scanner the pcm is also reading double the actual speed. the speedo maxes out at 87 and ca...
2003 Chevrolet Silverado 1500 4.8L vehicle continues to run after key has been turn o VIN: 1GCEK19V03
Please help, This is the Landlords vehicle!!! the owner stated that the other morning the vehicle would not start. The battery was dead. he jump started the vehicle & drove it for a while, when he went to turn the vehicle off it stayed running even after the k...
2004 Chevrolet Silverado 2500 HD 6.6L Brakes VIN: 1GCHK23104
Customer brought vehicle in today and said brake pedal feels low or spongy. Said it has not felt proper after first repair, but I feel it was because I drove it after repair and it felt fine. Reguardless the brake problem is there. When braking it feels normal...
1997 Geo Prizm LSi 1.6L No Start, Hesitation, Stall VIN: 1Y1SK5264V
Customer called about running issues to set appointment... no power stalling hard to start. Vehicle arrived the next day on the hook. Basic testing found no spark, using mitchell info was able to condemn pcm replaced with known good pcm engine started but pres...
1997 Saturn SW2 1.9L Surge, Cuts out, Misfire, MIL Lamp on VIN: 1G8ZK8275V
when started after engine repair ck engine light on & misfiring ,ck'd plug wire rounting ok ,scanner had po336 code for erratic crank sensor ,replaced sensor still had erratic signal on scanner & tach jumping around with misfiring engine.ck crank sensor circui... Trouble codes: P0336, P0744, P1599
2002 Saturn L200 2.2L MIL Lamp on VIN: 1G8JU54F02
Car has code 171b o2 sensor indicates lean, lt fuel trim is at around 24%. map is at 29.3. which seems to be right. intake air temp is good. coolant temp is good. tps is good. it seems like i have a vaccum leak but i cant find one to save my life. i have looke... Trouble codes: P0171

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Park Avenue 3.8L abs VIN: 1G4CW53L2M
Thank you to all 8 replies i received. Joseph from New York hit it right on the head. All we did was replace the left rear sensor not the hub bearing. ended up the rear cap was distorted. replaced the whole rear hub assembly and all is well. Thanks again for a...
2001 Cadillac DeVille 4.6L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1G6KD54Y41
Thanks for the try at helping, but this car left my shop unfixxed. I suspect that when the original O2s went bad it shorted out the PCM. I could get the O2 sensors to respond to a lean condition and fuel cut but other wise they were pegged at .9 volts which I ... Trouble codes: P0171 (Lean bank one), P0174 (Lean bank two).
1996 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13W7T
Hey everybody I really appreciated all the advise. The egr was stuck open, went ahead and replace valve, and gasket, with screen. That got the miss fires down to two cylinders 3 & 4 pulled the plugs 4 was fuel fouled 3 was not changed plugs made no difference.... Trouble codes: P0300.
1997 Chevrolet Cavalier Z24 2.4L instrument cluster VIN: 1G1JF12T9V
have checked connections and grounds going to the dash area and around the new fender all look good have had the car for over a week while the customer got some things done didnt need the car read the tsb for the ignition swtich problem but the customer and my...
1998 Chevrolet S10 LS 2.2L MIL Lamp on VIN: 1GCCS1941W
Installed a different O2 and fixed problem. The other O2 sensor would not reach the upper and lower limits at 2000 RPM to trigger the switch counter. The replacement O2 did. Trouble codes: P1133 (Insufficient Switching Sensor 1).
2001 Chevrolet S10 2.2L drive line VIN: 1GCCS19561
removed driveshaft, found out it was warped on rear shaft, purchased new shaft problem gone,carrier bearing was bad for a long time which caused problem
1994 Pontiac Bonneville SE 3.8L abs/trac off light on VIN: 1G2HX52L8R
very sorry about the very late post for the fix. after testing every wire in the system i found i was loosing ground at the main relay. while trying to provide my own grounds i determined the abs pump module was not working. after replacing pump module all lig...
1997 Pontiac Grand Am SE 2.4L passkey system VIN: 1G2NE52T9V
After reviewing all replies, I tried again to relearn the PASSLOCK system using the methods suggested and still had no results. As a last try I was going to leave ign. on until THEFT SYST. light went out. As the car sat I realized that the DAY TIME RUNNING LAM...
2002 Pontiac Grand Am GT 3.4L passlock VIN: 1G2NW12E32
Thank you all for the numerous replies. The one reply that really rang true for me came from a Mr. Joe [...], stating simply that theses passlock sensors fail, and he has never experienced a wiring problem with a passlock system. We re-replaced the passlock ...
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