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Professional Automotive Repair Technical Discussions for January 25, 2008 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1991 Buick Park Avenue 3.8L hvac blower motor VIN: 1G4CW53LXM HVAC blower motor stays running with key off. Replaced blower motor module. This solved the problem at first, then the next day had same problem. Checked purple 65 wire, orange 761 wire and fuse 2 for short to power. These all checked out ok. Plugged in anothe... |
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| 1991 Cadillac Fleetwood 4.9L Misfire VIN: 1GEDZ90B1M We have a miss on #4 cylinder, fuel pressure good, injector working, 175lbs comp 75 running. Spark good, cap replaced, plug replaced. This miss starts at cold start up and continues even after warm up. I can't give you gas reading as we don't have a gas analiz... |
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| 1966 Chevrolet El Camino 327CID Powerglide Trans Test drove vehicle on customer concern of some smoke upon acceleration. Observed same and also no kick down.Checked fluid level-at spec. and clean. This is a Powerglide with aluminum case. Pulled vacuum line from trans module and trans fluid came out. Replaced... |
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| 1995 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W1S vehicle came in 1 week ago for no start had no spark proved module bad replaced module and coil per customer request now has no start with no injector pulse and code 1351 can clear code and vehicle will start ran test in aldata and according to test the module... Trouble codes: 1351 (Electronic Spark Timing EST Output High Or Pulses Detected When Open) |
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| 2001 Chevrolet Suburban 2500 8.1L Cuts out, Stall VIN: 3GNGK26G71 Hello and thanks in advance. Customer states that on long highway trips the truck will stall at a steady speed as if he were turning the key off. After pulling over and a few start attempts it will start. He never remembers if he has dash lights or a SES light... |
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| 2001 Chevrolet Astro 4.3L engine this vehicle is driving me crazy.it came in with miss on cylinder #3.checked kv at sparkplug [...].checked noid at injector 3 thru harness good. did compression test not so good,it reads zero.where do i go from here.i took valve cover off and both rockers s... |
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| 2002 Chevrolet Trailblazer LS 4.2L Cuts out, Stall, MIL Lamp on VIN: 1GNDT13S82 This vehicle acts up very intermittently. Initially, the customer told me the vehicle bucked with the security, ABS and MIL & low power lights coming on. It kept running and he was able to drive it to our shop. I retrieved codes P1635 - 5 Volt reference 'A' lo... Trouble codes: P1271 (APP Sensor Correlation Error), P1635 (5 Volt Reference A Low), P1639 (5 Volt Reference B Low) |
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| 2002 Chevrolet Monte Carlo SS 3.8L Excessive Emissions, MIL Lamp on VIN: 2G1WX15K22 P0420 MIL keeps returning - low catalatic converter efficiency. catalyic converter was plugged replaced catalyic converter with aftermarket one, also replaced rear o2 sensor with aftermarket one, Is it a ECM flash problem?, or an aftermarket parts are not per... Trouble codes: P0420 |
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| 2004 Chevrolet Tahoe LS 5.3L rear wiper VIN: 1GD34TUI89 hey everyone i have a 2004 tahoe with a inop rear wiper motor i checked fuses has power to motor turn switch on has power on gray wire but is still inop. i think it might be a ground but wanted to know if anyone has ran into this before and maybe im overlookin... |
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| 2001 GMC 6500 series 8.1L speedometer VIN: 1GDJ6H1E71 on this truck I need the wire diagram to follow the speedometer circuit. also have the 500 code if I can have the steps to follow the test. my fax # [...] |
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| 1998 Pontiac Bonneville SE 3.8L Poor Idle Quality VIN: 1G2HX52K7W i have this 98 bonneville that wont go into closed loop unless you wot it and then it will go in. ltlft is at 16% closed loop or open. all scan data is appearing normal except the 02s are dead untill closed loop. have check circuitry vac and all related sensor... |
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| 1996 Saturn SL2 1.9L Excessive Emissions VIN: 1G8ZK5278T Need help with thyis one this Saturn came in with customer wanting tune-up and a smog check,after talking with customer,was informed "sevice engine soon" light came on aweek earlier, and went out.checked history codes and found o2 sensor not switching code,rec... |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 1989 Cadillac Fleetwood 4.5L air shocks VIN: 1G6CB1153K I found a spec in a manual for the shock air pump, max output should be about 180 psi. I tested the system for leaks by hot wiring the pump and filling the system. (It would eventually pump up the shocks but it took a few minutes.) The system held it's height ... |
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| 1994 Cadillac DeVille Concours 4.6L harsh engagemant VIN: 1G6KF52Y3R WELL ITS BEEN A WEEK NOW SINCE CAR LEFT THE SHOP AND ALL SEEMS WELL.THE REPAIR FOR THIS PROBLEM WAS THE ECM WE GOT A REBUILT AND INSTALLED IT.WHEN YOU FIST START CAR WITH THE RPLACE MENT ECM YOU WILL GET A CODE 86 FOR RUNNING RICH,THIS IS NORMAL TO GET RID OF ... |
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| 2000 Cadillac DeVille DTS 4.6L Poor Idle Quality, Misfire VIN: 1G6KF579XY Received many replies and followed most leads with no fix at this time, will have this vehicle for another week or so as customer is on vacation. will post final results when the fix is complete. Thanks to everyone who shared ideas. Trouble codes: 1599 (stall or near stall condition detected). |
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| 1994 Chevrolet Camaro 3.4L clutch VIN: 2G1FP22S3R after bleeding every way suggested I finally got it. the final method was to attatch a vacuum pump and leave the system under vacuum overnight. theplastic strap, apparently is supposed to break. thanks for all those who responded. |
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| 1994 Chevrolet S10 Blazer Tahoe 4.3L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GNDT13W0R Thanks again to everyone, I checked the EGR for leaks, but not good enough, I checked the pintle shaft for leaks, but the valve was actually stuck 1/2 way open, electronic type EGR, we installed a new one and car ran great. Thanks Again |
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| 2000 Chevrolet Silverado 1500 5.3L alternator VIN: 2GCEK19T6Y First thanks to everyone for all your useful suggestions.Secondly I'll try to answer most of the basic questions, it has a new delco battery[ dt650?], it is a plow truck and has nothing else added.Alternators are NAPA brand 105 amp., luckily with 3year warrant... |
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| 2000 Chevrolet Venture 3.4L brake lite system VIN: 1GNDX0302Y Thanks for all that replied.This van had 2 problems. first the ground stud by the battery was loose so I made a new ground position.second when it was worked on in the past, someone put the main harness between the dogbone and its mounting poiny making a very ... |
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| 2001 Chevrolet Silverado 2500 HD 6.6L engine VIN: 1GCHC29151 First I would like to thank every one who replied. After removing the rocker shafts and push rods, I checked and found eight bent pushrods, three damaged rokers and four broken bridge caps. I ended up barrowing a compression gauge and ordering the parts nee... |
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| 2004 Chevrolet Impala LS 3.8L Electronic VIN: 2G1WH52K84 Thanks for the help, it seems like it was the blower motor in the first place and the smell was just still in the duct work, I tore the dash apart and didnt find anything hot or melting, I used Febreze and sprayed it right into the blower motor area from under... |
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| 2006 Chevrolet Impala LS 3.5L engine VIN: 2G1WB55K86 Hello to all. Thank you for your help. We put a new thermostat in this car only to watch it still overheat. We recomended a to replace headgasket and they decided to take it to the dealer. ( company car). Thanks for ideas from everyone |
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| 2004 GMC Sierra 3500 6.6L Won't shift VIN: 1GCJK332X4 Well we did all the troubleshooting we could do. most replies said to look for power problems from the ignition switch. Everything we checked was ok. We have condimmed the trans control module. customer is going to send it to the dealer.Thanks for all the help... |
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| 1993 Oldsmobile 98 Regency 3.8L Cuts out, MIL Lamp on VIN: 1G3CW53LM4 Well guys thanks for all the help. Most of you said check the cam gear and yes the magnet was broke. I did not think to check the cam gear because of my voltage reading with KOEO , cam sensor unplugged Terminals A-B . Need to fix timing chain first then retest... Trouble codes: P0041. |
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