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Professional Automotive Repair Technical Discussions for May 25, 2010 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1996 Cadillac DeVille 4.6L security system VIN: 1G6K52YXVU this vehicle went to start it and the information cluster says security system fault car may not restart, well its never started, no comunication with scan tool. I,ve tryed unlockin and locking vehicle with key fob with no change, Scan tool says i need to turn... |
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| 1996 Cadillac DeVille 4.6L Mechanical VIN: 1G6KD52XYV just got the subframe back in from doing the heads on this one got security module problem fixed and fire it up to listen to a rattling top end with zero oil pressure. Any ideas would be good. didnt even take the oil pump off the block, or remove the inner cha... |
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| 1999 Cadillac DeVille 4.6L Stall VIN: 1G6KD54Y1X The car runs fine when it is cold, but when the temp gets to N.O.T. it has a tendency to cut off when you come to a stop. The ipc temperature reading is indicating 220F, but direct temperature reading is at water outlet is reading about 215F. We also replaced ... Trouble codes: P1599, U1255 (class 2 initialization error), U1016 (Loss of serial communications PCM), U1088 (Loss of serial communications), U1040 (loss of serial communications), U1040 (loss of serial communications) |
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| 2002 Cadillac DeVille 4.6L Unknown VIN: 1G6KD54Y62 Owner complaining that the A/C will not always hold a consistent temperature. Climate control may be set for 65 and may cool to that for a while, then changes to warm air on its own. I am unaware whether a scanner will help to diagnose. I suspect the HVAC Cont... |
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| 1973 Chevrolet Corvette 5.7L bat, draw VIN: 1Z37J3S430 Hi everyone, we are lost on an old car that we don't work on. It is a friend of mine's car, we work on modern european cars, so this is foreign to me!! The problem is a parasitic draw of about 350ma. We traced the draw to the alternator(voltage regulator) if w... |
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| 1990 Chevrolet C1500 Cheyenne 5.0L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1GCDC14H3L Truck was in a month ago with the same problem and we replaced the ECM and ignition module to no effect. Our guy read the posts on IATN and decided that the magnets or shaft on distributor were bad and we recommended a new distributor. the owner declined this ... Trouble codes: 42 (Spark control) |
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| 1995 Chevrolet C1500 Suburban 5.7L Surge, Stall VIN: 1GNFK16KOS This first thing that was done is the intake manifold gasket, apon removal noticed the egr ports where completely blocked so I cleaned them out, the car run good put if you in gear and stay at a stop with it in drive the engine starts to surge (not always) my ... |
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| 1998 Chevrolet K2500 Cheyenne 7.4L MIL Lamp on VIN: 1GCGK29J8W Came back to me NO performance issues just check engine light, Scanning the truck I see the bank 1 down stream O2 sensor read very low .01mv sometimes jumps up to .06 and bank 2 downstream sensor is cycling between .2 and .6 (i consider normal)is it? These are... Trouble codes: 137 (O2 low voltage bank 1 sensor 2), 172 (Fuel trim rich bank 1), 175 (Fuel trim rich bank 2) |
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| 2002 Chevrolet Tahoe LT 5.3L rear temp door actuator VIN: 1GNEC13Z62 Hi Fellow Techs, We have this Tahoe(the shop owners brother's)which is giving us fits with the rear A/C temp actuator. We are able to scan codes (BO434) but cannot get data from our Genesys. We found a bulletin #06-01-39-015A pertaing to a controll module tha... |
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| 2003 Chevrolet Tracker LT 2.0L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Poor Fuel Economy VIN: 2CNBJ13C53 03 tracker,4 cyl auto,running rich,hard starting,fouling plugs,no codes,checked datastream,everything checks out,fuel pressure ok,o2 sensors switching ok coolent temp within range,tp sensor reading ok,have checked all sensors,tried a computer still running ric... |
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| 2004 Chevrolet S10 LS 4.3L security VIN: 1GCDT13X84 posting this for a good friend. vehicle was purchased about three years ago as a flood or water damaged vehicle, no problems until now. apparent pass-key problem, security light will flash and vehicle will not start. leaving key on until security light stops b... |
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| 2005 Chevrolet Silverado 2500 HD 6.0L noise VIN: 1GCHK23U55 This truck runs great but makes a whistle on light acceleration from the intake area. Much louder when towing. Sounds like a vacuum leak but unable to find one. Could it be a cracked intake? Thanks in advance. |
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| 1993 GMC Sonoma 4.3L Hesitation, Cuts out VIN: 1GTCS19W4P Severe midrange hesitation caused by loss of Vortec tuning valve control. ECM will not command Intake Tuning Valve on. That's the problem, period. Symptom is pronounced hesitation and sputtering during mid-range acceleration. This is when tuning valve is sup... |
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| 2000 GMC Sonoma SLS 4.3L Oil leak VIN: 1GTCT19W6Y This GMC is cursed! Finally fixed a misfire and now it's started leaking oil. Start over, engine replace by another shop, came to me to fix misfire they couldn't figure out. Shimmed crank sensor and fixed misfire. Now customer is back with a oil leak, appears ... |
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| 2003 GMC Safari 4.3L Won't run monitors VIN: 1GKEL19X33 Followed 'shopkey' drive cycle to the letter several times, verified coolant and IAT parameters, fuel level, brake switch, cold start. Have even disconnected battery again, running drive cycle then results in all monitors completed EXCEPT O2 and EVAP. http://... |
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| 2004 GMC Sierra 1500 5.3L a/c comp. VIN: 2GTEC13T14 if yoy look at data. it say a/c permission granted but also says a/c switch off. if you push a/c switch and hold it down it says on but compressor does not engage. is there a way to reprogram module. all my test say bad part module. also inside air temp reads ... |
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| 1989 Pontiac Firebird Formula 5.7L No Start, Stall, No start cold VIN: 1G2FS2185K Hi Y'all ! I have this firebird formula 350 5.7 ! It wont start when cold and has spark, no injector pulse. (HMMMMM #1) Spraying starting fluid gets it going and then it starts ok. While cranking There is finally a little glow on the noid light and then a dull... Trouble codes: 52 (Customer had unplugged timing connector DUH) |
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| 2000 Saturn LS2 3.0L Fuel pressure VIN: 1013073673 Car came with a no start,no fuel pressure dropped tank fuel pump and gas tank were full of rust, replaced fuel pump and clean out gas tank,still no pressure had tech check all wiring and pump was not getting voltage pulled fuel pump relay and all signals there... |
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| 2002 Saturn SL 1.9L Misfire, MIL Lamp on VIN: 1G8ZF52862 This saturn come in with an apparent missfire in cylinder # 4. After some diagnosing it is found that coil pack for # 1&4 is bad. replaced it and car ran great. After the weekend the pile was back with a missfire. This time it seemed a little worse. scanner sh... Trouble codes: P0300 |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 2000 Buick LeSabre Limited 3.8L Electrical VIN: 1G4HR54K6Y Hi All!!! THANKS to all that tried to help!!! We had to turn this one loose to the Customer because we could NEVER get the symptoms to show. And so far, since they have had the car back, neither could they! Maybe a "one time" glitch??? UNKNOWN T... |
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| 2007 Buick Rendezvous CX 3.5L No Start VIN: 3G5DA03L77 thanks for the help, replaced pcm & had programmed, runs like a top, its nice to bounce these problems off of several shoulders, what a great site!!! Trouble codes: P0335 (Crk sensor). |
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| 1980 Chevrolet C70 C7D042 6.0L Brake Hose VIN: C17DBAV134 Thanks for all the ideas. I ended up using steel line with 3 loops in it to hopefully take up any slight movement. I did find a hose at CarQuest that was the right length (SP5772), but required adapters on each end to attach to the 5/16 line. The inner dia... |
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| 1991 Chevrolet Cavalier VL 2.2L Unknown VIN: 1G1JC5443N Thanks to all the 22 replies it was the IC modual we had it tested at auto zone they sead the old one was good so we kept racking the brain and more and more replies kept saying ICM so we pugt everything in new crank sensor,ICM,coil paks runs like a champ now ... |
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| 1999 Chevrolet Blazer 4.3L transfer case operation VIN: 1GNDT13W7X Yes the transfer case control module was at fault ,but, the dash switch was also faulty due to the customer repeatedly hitting it trying to get it to work properly.I replaced the switch and module and turn signal switch now all is well.Thank You all for the a... |
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| 2002 Chevrolet S10 LS 4.3L No Start VIN: 1GCDT13W92 Okay, I had multiple issues. I didn’t have any spark, so I checked the coil’s primary and secondary resistance and it tested within the specs I found online. I pulled off the ignition module and took it to Auto Zone and that was good but I still didn’t have a... |
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| 2002 Chevrolet Cavalier 2.2L Surge, Stall VIN: 1G1JF52FX2 Thanks to all, what fixed it in the end is getting it reflashed. After analysing everything to death we decided it would be worth the money to get it flashed and try. It runs better now and the car is gone. Anybody have an affordable aftermarket reflash system... |
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| 2002 Chevrolet Express 3500 5.7L Misfire, MIL Lamp on VIN: 1GCHG35R02 Thanks for all you're help, fixed the van Saturday morning finally adjusted the timing adjustable or not assume the timing chain is stretched a little, works perfect. Thanks again. Trouble codes: P0300. |
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| 2007 Chevrolet Suburban 1500 LT 5.3L Accessories VIN: 1GNFK16347 I HAD NO CLEAR FIX FROM FELLOW TECHS. SUGGESTIONS WERE GOOD BUT DID NOT FOLLOW DESCRIPTION OF CODITION. TO CLARIFY, DOOR COMPONENTS WERE ORIGINAL TO THIS VEHICLE. ALL THE BODY SHOP DID WAS DISCONNECT WIRING AND REATTACH AFTER PAINTING DOOR. PDM WOULD NOT COMMU... |
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| 2005 GMC Sierra 1500 5.3L Actuator VIN: 2GTEK13TZ5 YES YOU CAN REMOVE THE PASSENGER AIR BAG AND I ALSO REMOVED THE UPPER INSTRUMENT PANEL IT COMES OUT IN ABOUT 5 MIN AND ALLOWS YOU TO LOOSEN THE SCREWS FOR DUCT DIRECTLY ABOVE THE ACTUATOR. SMALL HANDS AND PATIENCE ARE NEEDED ALONG WITH A PRY BAR TO GENTLY LIF... |
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