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Prev Professional Automotive Repair Technical Discussions for January 13, 2011
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Open Help Requests for GM
Help Request Answers
1991 Buick Century Custom 3.3L Cuts out, Stall VIN: 3G4AH54N7M
I would like to see what IATN makes of this. When this Century came in, I was out of town. It was stalling intermittently hot or cold, Would run fine one minute, then rough idle, stall or correct to normal. The owner brought a fuel filter. Code history, 34-M... Trouble codes: 34 (Mass Airflow Failure), 28 (3rd gear switch or circuit problem), 27 (2nd gear switch or circuit problem), 26 (Quad Driver Module Failure), 42 (Electronic Spark Timing EST Problem)
1993 Buick Skylark Limited 3.3L Starting VIN: 1G4NJ54N6P
Help Techs! I have a 93 Buick Skylark, 3300. No start. No Injector Pulse, No Spark. Replaced Crank Sensor. Tried KNOWN Good Ignition Module and ECM. Have power to Ignition Module. When key is turned to run position the ground wire to the Crank Sensor has power...
1998 Buick Park Avenue Ultra 3.8L battery VIN: 10002XT578
This park ave has a draw on the battery .when i remove battery 1 maxi fuse 60 amp the draw goes away. I have tried removing fuses to kill the draw only the battery number 1 60 amp maxi fuse kills draw. I have unplugged radio bcm instrument cluster alternator, ...
1994 Chevrolet Camaro Z28 5.7L Misfire VIN: 2G1FP22P3R
Engine missfires and "pings" at 40mph in high gear with converter locked up. I looked at the ignition patterns and voltage, looks good, did an injector balance test and during the test I noticed that the fuel pump was acting strange. When i pulsed the fuel pum...
1996 Chevrolet S10 4.3L No MIL VIN: IGCCS19X8T
Customer had been driving the car in limp mode for over a year he didnít notice that it was not shifting. The check engine light had been on for a year and, after he had a heater core replaced 4 months ago the light was off. It failed the Arizona emission test...
1999 Chevrolet Silverado 1500 LS 5.3L No Start, Poor Idle Quality VIN: 2GCEK19TXX
When truck sits outside overnight the next morning you go to start it and it fouls out the sparks and won't start,Then after cleaning plugs it runs fine. If you let it sit again it will do the same thing. Injector pulse is in spec. mass air sensor in spec. co... Trouble codes: P0171, P0174
2000 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY22G6Y
My favorite corvette hasn't been gone long enough, after fixing multiple wiring problems for a start and stall the car has returned to me yet again with these new codes p1133,p1153. I have checked all wiring to and from o2 sensors and pcm, installed 4 new 02 s... Trouble codes: P1133 (Insufficient h02 sensor switching bank1 sensor 1), P1153 (Insufficent h02 sensor switching bank 2 sensor1)
2003 Chevrolet Trailblazer LS 4.2L Encoder Motor VIN: 1GNDT13S43
Customer came in with 4wd service light on and code c0327. The switch indicator light is stuck on 4wd high. Cleared code and moved switch and could here the actuator working 3 or 4 times and then same problem. Found tsb#04-04-21-004 for this code-bad encoder s...
2006 Chevrolet Malibu LS 2.2L starter VIN: 2G1WB58N46
Hello out there. I have an intermittant problem, hoping someone has seen similar. 2 weeks ago customer had no start. No key fob no dash, nothing. Customer borowed our booster pack and started his car. When he came in everthing tested ok. The only indication of...
2006 Chevrolet Express 3500 6.0L Hesitation VIN: 1GBHG39U26
problem occurs very intermittently. no codes in any module. this is a fly by wire system. I have gotten this problem to occur a few times by stop and go driving. from a stop when you accelerate the traction light will begin flashing and the van has no power wh...
2007 Chevrolet Silverado 1500 LS 4.8L Theft System VIN: 1GCEC14X57
After changing battery we now have a no crank with a sevice theft deterrent on the dash and a code b3060 is there a relearn without using a scanner.
2008 Chevrolet Avalanche LS 5.3L Differential VIN: 3GNFK12388
Have customer complaint of vehicle "feels lumpy and tries to stop itself while backing up with 4wd engaged and wheels turned." Had it in last week for a bad noise, and found the RF Hub Destroyed. Replaced hub and drove again. Sounded like a slight groan to me,...
2003 GMC Yukon Denali 6.0L cooling system
Tech help please this 2003 denali has had me at wits end have any of you guys run in to this before ive had many cars come in with a p0128 code and I put thermostat in them and fixed them but ive never had one i put a gm thermostat in and the light come back o...
2004 GMC Savana 2500 6.0L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GTGG25U14
While test driving this van a week ago I noticed that the engine would hesitate and stumble only when making a Right Hand turn and slightly accelerating the same time. Travel in a straight path or make a Left Hand turn, no problem. We checked under the van for... Trouble codes: P0336
2006 GMC Sierra 1500 SLE 5.3L air bag light VIN: 1GTEK19BX6
The problem I have is it has service code B1001 after replacing module,incorrect configurtion.I have read you can fix this.I can't figure it out.I do have a Tech2.There is a configurtion on special test,but it saids complete ,tried to do it and no luck.I don't...
2003 Saturn L200 2.2L blower speed VIN: 5452318541
Hey guys thanks in advance... we got a car in today 03 L200 saturn once the key is on the heat is on full blast no matter what u put the control on. only way to turn it down is by turning the key off... let me start by saying today is my day off so i was not t...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Cadillac DeVille 4.9L ride control VIN: 1G6KD52B1R
Hi gang The vehicle is fixed and one very happy customer. I ordered the kit from Strutmasters and the relay kit from Napa. I wired it in as per the tsb and all worked well. You people are the greatest. Thanks for all the help Tommy
1997 Cadillac Seville SLS 4.6L theft deteant VIN: 1G6KS5Y4VU
Thanks for your help, it seems at some shade tree mechanic left a connector unplugged and turned a fairly simple 1 hour job into a 3 day boondoggle. I guess I should stick with the engineering side of things now. But I just can't bring myself to pay someone ...
2004 Cadillac CTS 3.6L ebcm VIN: 0G6DM57704
hi everyone After the brake pedal postition switch was adjusted, the ABS would set a code if activated. The code was right rear tire not starting to turn fast enough after the pedal was released. I flushed the brake fluid and still had trouble. I'm in North...
1989 Chevrolet Caprice Classic 5.0L Springs VIN: 1G1BN51E4K
thank you to anyone who put forth an effort to helping,i ended up using moog cc621 instead of cc623 in the rear.this spring has a 1.75 inch higher installed for the fronts im still researching an old spring book my supplier came up with and i will ad...
2001 Chevrolet Monte Carlo SS 3.8L trans? axle? wheel bearing? VIN: 2G1WX15K11
I recieved 28 good replys, that was great. Some refered to tsb about aluminum subframe cracking. I had seen this before and had checked it, forgot to mention in post. Many others said after market wheel bearings, this was where I was headed, but wish i had tak...
2002 Chevrolet Trailblazer EXT LT 4.2L abs and transmission VIN: 1GNDT13S02
after further inspection of all the connectors and completing a tsb for a loose ground at the engine block for pcm, the fix was the harness at the speed sensor was missing the rubber isolator at the purple white wire, the configuration of this harness was allo...
2002 Chevrolet Tahoe LS 5.3L Hot Cold Mode Actuator VIN: 1GNEC13Z72
this one is repaired at last. The fix was a new pigtail or wiring harness for the blend door actuator. We ordered a new one and replaced it. Performed the needed relearn and it was fixed. Thanks for the wonderful help and replies. And specil thanks to Edward a...
2007 Chevrolet Suburban 1500 LT 5.3L Tailgate Motor VIN: 1GNFK16327
I installed a new lift motor assembly (very expensive). It did not come with the tailgate lift motor module. I pressed the button and the same problem occured. I installed a different scanner and found that on this one I could enter the tailgate lift module. F...
2001 GMC W3500 Forward W3S042 5.7L Hesitation, Misfire VIN: 4KDB4B1R51
I replaced both ox sensors the maf sensor and the cap and rotor that fixed the problem thanks for all the help. Michael Harrisburg Auto Service Trouble codes: P0468.
1978 Oldsmobile Omega 3.8L choke heater VIN: 3B69A8W109
Thank you, everyone, for all the info. The problem was that I didn't have the correct schematic to now what is the source power. This is a 2 pin oil switch. Mitchell shows only a 3 pin switch and most responces I got said the same. A page from an original GM b...
1987 Oldsmobile Delta 88 Royale Brougham 3.8L Cuts out, Stall VIN: 1G3HN5433H
Thanks for all your insights and help. I was very impressed at the amount/quality of the responses. After watching the data closely I noticed that the MAF was jumping from 6 g/s to 26 g/s and at that moment the car started to act up. I unplugged the MAF and...
1992 Pontiac Grand Prix SE 3.1L Mechanical VIN: 1G2WH54TXN
Thanks to all who replied. The lifters in this engine refused to bleed down even running with rockers loose. The push rods were all in the right place. We tried on and off several days and times to get the lifters to work. Today we gave up pulled engine apart ...
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