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Professional Automotive Repair Technical Discussions for October 16, 2008 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1998 Buick Century Limited 3.1L drivers electric window VIN: 2G4WY52M1W Drivers window rolls down all by it'self, just after car is started, after that happends , window up switch does not work, wont roll up, then it will roll up after a few minutes of driving if it does roll up it is jerky We checked the switch and connections,a... |
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| 1999 Buick Regal LS 3.8L Inst.cluster VIN: 2G4WF5516Y thanks in advance, Vehical will blow the [...] fuse and die only when trans is shifted from D to R, scoped ckt with modis low amps probe and found that when this happens amps go above 20amp scale.After wiggling looms and tap testing ecm and bcm Vehical sto... |
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| 2000 Buick Century Custom 3.1L electrical VIN: 2G4WY52M6Y CAN SOMEONE PLEASE ADVISE ON THE BCM AND PCM WHAT CONNECTOR OR PIN LOCATION (WIRE COLOR) CURCUIT # NUMBER IS THE VATS FUEL ENBALE WIRE.I HAVE LOOKED IN ALLDATA AND ALSO MITCHELL onDemand WITH NO INFO OR INCORRECT INFO. THANK YOU IN ADVANCE ALAN [...] COMPLETE A... |
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| 2002 Buick Regal LS 3.8L MIL Lamp on VIN: 2G4WB55K62 Replaced converter with OE (twice) and code returns. No other codes. O2 readings appear normal. I assume converter isn't the problem. What should I look for? Trouble codes: P0420 |
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| 1985 Chevrolet P30 School B 366CID motor on hydraboost VIN: 1GBJ6P1B5F I'am working on a school bus with hydraboost. There is an electric motor mounted on the bottom of the hydraboost. The motor runs all the time and is hot to the touch. I was told the motor is a backup for the system if the power steering system fails. There is ... |
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| 1987 Chevrolet Camaro Z28 Iroc-Z 5.7L Poor Idle Quality, Stall, Misfire VIN: 1G1FP2180H CAR RUNS BAD!!! IT WON'T STAY IDLING. IT IDLES ROUGH AT 650 RPM THEN AFTER ABOUT 5 MINUTES IT IDLES UP TO 1450 RPM (BUT STILL ROUGH) THEN IT WILL GO BACK DOWN. SCANNER REVEALS A RICH MIXTURE CODE. FUEL PRESSURE IS OK, SPARK OUTPUT IS OK, COMPRESSION IS GOOD. I... Trouble codes: 45 (rich running) |
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| 1998 Chevrolet Blazer 4.3L Fuel gauge,low fuel light, battery light VIN: 1GNDT13W2W The on going problem is the 4Wd fuse (ignition power for VCM)will blow after vehicle is started and driven(only a vehicle length did it yesterday)After the vehicle is shut of and restarted thats when the gauges won't work(due to 4WD fuse)It will not blow until... |
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| 2000 Chevrolet Cavalier 2.2L idle and a/c VIN: 1GIJF5249Y Vehicle engine idle surges when A/C clutch cycles. The engine will surge and idle will increase (from 600 to approx 1100)briefly then idle down and within a few seconds will surge and repeat. The compressor has been changed along with orifice tube. The pressur... |
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| 2000 Chevrolet Venture 3.4L No Start Got one for you GM guys. Got this 2000 Venture that is a no crank condition with a 1626 and B1000 code. All of the modules communicate except for anti-theft, but does the [...] communicate and give data? This anti -theft is a little different than one's I... Trouble codes: 1626 (Fuel enable signal not received) |
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| 2001 Chevrolet S10 2.2L Cuts out, Stall VIN: 1GCCS19561 This vehicle was purchase used by the owner two months ago. He has experienced what he describes as a stall or cutout. When we first were informed of the complaint he had backed the vehicle out of his driveway and it stalled and would no restart. We towed it t... |
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| 2001 Chevrolet Impala 3.4L Poor Idle Quality, Surge, Stall VIN: 2G1WF52E61 Vehicle came in for died while driving and hard to restart. Had some VTD codes and the U1000 codes. I replaced the key and lock cyl and did the passlock relearn. The vehicle started and ran for an hour or so. I put about 4 miles on the vehicle and let it run a... Trouble codes: U1000 (Loss of class 2 serial comm), U1255 (Generic Class 2 communication fault), U1016 (Lost comm with ECM/PCM/VCM) |
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| 2002 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC52492 This has me baffled. Vehicle came in with CEL on and a P0442 code. Checked it out with tech 2 and it was leaking down with the system sealed. I smoke tested the system and found I had a small amount of flow, but no smoke coming from anywhere. The decision was ... Trouble codes: P0442 (evap small leak) |
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| 2005 Chevrolet Malibu Maxx LS 3.5L Brake Lights VIN: 1G1ZT62875 Greetings to all. We have this Malibu in here that has the brake lights coming on, and sometimes staying on and killing the battery, with no rhyme and reason. The last time it happened it went 2 weeks in between occurences. The last time it was in we were actu... |
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| 2005 Chevrolet Silverado 2500 HD 6.6L Poor Idle Quality, Stall, hard start/rough run VIN: 1GCHK29285 this duramax came in on the hook as a no start,customer was driving and died. we checked codes and found p0336.so we put a crank sensor in with no luck, further inspection found a loose reluctor. front cover was removed and reluctor replaced. truck still would... Trouble codes: P0336, P0341 |
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| 1999 GMC Sierra 2500 SL 6.0L poor acceleration VIN: 1GTGK29U4X I am having trouble fixing this one. I have scan tested several times and find no codes and the readings on everything look good. No matter what I do the problem does'nt change. The vehicle starts good warm or cold, idles good all of the time but on accelerati... |
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| 2002 GMC Envoy SLE 4.2L air bags VIN: 1GKDS13S32 Thanks in advace, this truck came with a air suspention bottomed out in the rear , abs and brake light on and no speedometer reading. tested circit and 30 amp fuse under hood blowing for compressor , disconnect compressor and fuse stopped blowing , Needs pump ... |
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| 2005 GMC Sierra 1500 WT 4.3L rear brakes VIN: 1GTEK14X45 Rear brakes keep over adjusting until brake pedal becomes firm and slightest braking causes brakes to lock up. We have checked wheel cylinders, auto adjust operation and found wheels adjust with forward motion, not reverse motion. Adjusters can not be put in b... |
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| 2002 Oldsmobile Silhouette Premiere 3.4L temp gauge VIN: 1GHDX23E52 engine runs fine. temp gauge stays at normal spot, in middle, while driving. but at red light, gauge will go up the 3/4s. no higher, fan kicks on, etc. customer, and now i, am curious as to why its happening. |
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| 2002 Pontiac Grand Prix GT 3.8L hard shift when at all times VIN: 1G2WP12K92 Hello techs, Thanks in advance, i have a customer here with a 2002 Grand Prix GT she is complaining about her transmission shifting rough mostly when hot. When the car is cold the gears shift fine, however lately its been acting up when cold and hot. Any advic... |
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| 2003 Pontiac Grand Am SE 3.4L No Start VIN: 1G2NG52E33 Some other data stream info. Injector plus 7.84 during cranking MAF 0.00 g/s unpluged, 4.37 g/s cranking, KOEO any where from 68.61-241 g/s (is that normal?) So car is towed in as no start and customer states it is a fuel pump. We check fuel pressure and it... Trouble codes: P0131 |
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| 2000 Saturn LS2 3.0L Surge, MIL Lamp on VIN: 1G8JW52R4Y Customer complaint was CEL and car stalls when hot, will not restart until cooled down. Pulled codes P0727, 1780, and 0102. I replaced the crankshaft postion sensor and reset the computer and road tested. The Po727 and 1780 codes did not come back and stalling... Trouble codes: P0102 (Mass air flow low), P0727 (No RPM signal to TCM), P1780 (Transmission code - goes back to P0727) |
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| 2000 Saturn LW1 2.2L No Start, MIL Lamp on VIN: 1G8JU82F3Y I replaced both coils and all the plugs put everything back together and started the vehicle, the check engine light remained and the engine was visibly misfiring so I rescanned to confirm. There now was a multiple misfire in bank 1 3 5 no longer isolated in c... Trouble codes: P0405 (egr sensor a circuit low), P0030 (h02s heater control circuit bank 1 sensor 1), P0301 (cylinder misfire detected) |
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| 2004 Saturn Vue Red Line 3.5L Alternator VIN: 5GZCZ634X4 Hello all, I have a Saturn Vue I'm having some trouble diagnosing. The vehicle came from a body shop where they installed an alternator because the original unit was damaged in an accident. There is no charging voltage at all. Code P0621 Generator F-terminal c... |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 2002 Buick LeSabre Custom 3.8L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G4HP54K92 Well techs, this one is still not solved. I did find that the rattling noise is the catalytic converter. Ran propane into crankcase--no change. Ran a leakdown test on Cylinder #2- 40% Leakage. Ran with o2 sensor out thinking problem with cat converter plugging... Trouble codes: P0300 (Engine Misfire Detected), P0440 (Evap leak), P0442 (Evap Emmissions small leak detected), P0452 (Fuel Tank pressure sensor [...] voltage). |
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| 2003 Cadillac CTS 3.2L Excessive Emissions, Burns Oil VIN: 1G6DM57N53 Thank you for the replies I received. Most of the answers stated that I may have a PCV problem. Only problem is, is that I did not gain any knowledge about how this PCV system on this Cadillac CTS works. It's a odd system, I can't even find the PCV valve. To a... |
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| 1979 Chevrolet Corvette 5.7L heater/turn VIN: 1Z8789S402 Let me start by giving a big thanks to John from California and Thomas from Jersey. They both faxed and e-mailed exactly what I needed.(wiring diagrams) This car was fixed with great time with their help. The problem with the heater and power window circuts wa... |
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| 1987 Chevrolet S10 Blazer Sport 2.8L hydraulics VIN: 1GNCT18R5H well customer came in today and took vehicle, I charged him labor and now have three sets of clutch slave/master parts for a s10 blazer, he of course was still upset I charged him at all, some people you can't reason with, I've had customers I've bent over bac... |
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| 1989 Chevrolet Camaro RS 5.0L No crank VIN: 1G1FP31E7K Thanks to all nine techs who replied & sorry for the delay in closing this post. The tech that posted this request quit after he repaired the vehicle & didn't close it. Two of the replies nailed this one, Alan from Missouri & Edward fron Virginia, both said th... |
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| 1999 Chevrolet Tahoe LS 5.7L a/c controls VIN: 1GNEK13R1X after shecking the wiring and all terwinals we installed a new control and so far so good |
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| 1999 Chevrolet Cavalier LS 2.2L Transaxle VIN: 1G1JF5244X Well thanks for all the quick replies. Just about everyone was right. It was the RF Wheel Speed Sensor. Thanks again everyone. |
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| 2003 Chevrolet Trailblazer North Face 4.2L Engine VIN: 1GNDT13S23 Thanks for all the input. I really suspected the fuel was the problem and having documentation really helped "sell" the concept of not using old gasoline. They drained and cleaned the tank and have been running it for 2 weeks without any more problems. I gave ... |
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| 2003 Chevrolet Astro 4.3L Lifter VIN: 1GNEL19X93 Thanks to everyone who took the time to answer,Tom hit it with cam lobe ,even though i did inspect for wear on the lifter (none found) and the fact that these engines are so @4&#*=# Cramed in i basicly had to lay in the engine while another tech turned the eng... |
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| 2004 Chevrolet Avalanche 1500 5.3L brake booster warnin VIN: 3GNEC12T94 Thanks to John and Joseph for replying. John found a recall notice for me and Joseph said to re-flash IPC. Since I can do neither in my shop I recommended the customer take vehicle to dealer. I hate to do that but I was unable to solve the issue. Thanks a... |
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| 2005 Chevrolet Cobalt 2.2L No Start VIN: 1GIALI5FX6 Thanks for all the help. it turns out the computer was the culprit. the computer on these cars can not stand low voltage, apperantly when the customer changed battery they blew the computer. Thanks again. |
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| 2002 GMC Envoy SLE 4.2L guages inop VIN: 1GKDT13S22 Well Im gonna call this one fixed! Finally. First off I spent way too much time screwing around with this thing.After checking all the modules that my Modis would communicate with, like I may have stated before I installed a new igntion switch and I replaced t... Trouble codes: U1041, U1026, U1041, U1152, U1162. |
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| 1995 Oldsmobile Cutlass Supreme 3.4L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G3WT32X2S hello and thank you to everyone who took the time to help with this one, a lot of very good ideas were tossed at me which helped locate the problems {2}, I was leaning hard towards the lower intake leaking as were most of the replies, and hard a hard time conv... Trouble codes: P1640, P1650. |
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