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Professional Automotive Repair Technical Discussions for April 23, 2004 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1987 Buick Skylark Custom 2.5L No Start, Stall VIN: 1G4NJ1407J Vehicle sometimes no-start, when it does start runs for 20 seconds then stalls. When the no-start or stall occurs always has good spark and constant fuel pressure, but the injector spray pattern looks a little weak. Testing shows that pulse width and injector ... |
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| 1994 Buick LeSabre Custom 3.8L spark knock VIN: 1G4HP52LXR This car has a severe spark knock on acceleration. Engine has been decarbonized. Coolant mixture is 50% (-34°). Linear EGR valve has been tested and is working. Knock sensor is recognizing the ping and the PCM is retarding timing about 4-5°. EGR passages are o... |
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| 2002 Cadillac Escalade 5.3L body VIN: 1GYEC63T82 This vehicle is owned by some very good friends of mine. Recently in a convenience store parking lot, after the engine was cranked from a short hot soak and put in reverse with the brake applied the vehicle backed up on its own under wide open throttle conditi... |
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| 1986 Chevrolet S10 2.5L No Start VIN: 1GCBS14E2G I have fixed lots of cars but, of course, why is it always your own vehicle that has you scratching your head. Anyway, I replaced my distributor a little over a year ago and since then I have put 4 ignition modules in it. At first it takes a little longer cran... |
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| 1998 Chevrolet Malibu LS 3.1L tcc solenoid VIN: 1G1NE52M3W I have an 4t40e in this Malibu that needs tcc solenoid, I need to know if transaxle has to be removed in order to replace solenoid. have removed subframe but does not appear to have enough clearance to remove side cover. Thank you! |
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| 1998 Chevrolet Cavalier 2.4L Unknown VIN: 7823GHEW45 this 98 cavalier 2.4 has a 4t40e trans in it with 100k...trans never touched...customer said speedometer went nuts niddle bouching off 200km to 0km then trans started slipping...then she towed it in to my shop...as soon as i roadtested it slowly never got over... |
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| 2000 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS1451Y I was home today and shop called me to see if the iatn knows of any common problems with the secondary air system and code p410. We don't have information on this year. Customer will come back for work. Trouble codes: P0410 |
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| 2001 Chevrolet Silverado 2500 6.0L brakes and gas gauge and radio VIN: 1GCHK24U61 hi guys ,, ,got a wierd one,, truck got towed in for no brakes,,when road tested brakes were fine and stopped on a dime,,,noticed low fuel light on and gas gauge on dead empty,, ( whats new huh !!! ) road tested to gas station after 2 blocks gas gauge was read... |
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| 2001 Chevrolet Cavalier LS 2.4L Convertor VIN: 1G1JF52TX1 Shudder occurs under light load. TCC duty cycle shows only 42-48% on scanner. If I use scanner test and lock convertor the shudder goes away. Road tested with TPS disconnected to force max line pressure and shudder was present. The only way to eliminate shudde... |
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| 1984 GMC Caballero 3.8L Surge VIN: 1GTCV8093E It has been a long time since I've seen one of these, let alone work on one.Vehicle has a surge about 50 mph.Under light load, RPMs will drop back and forth about 500 rpms.Felt like starving for fuel. Tested fuel pump. struggled to reach 3.5 psi.,and was leaki... |
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| 1999 Pontiac Grand Prix SE 3.8L Rt side Electronic Acutator VIN: 1G2WP52KOX The complaint on the vehicle was the pass. Dual zone temp knob would not change discharge temperature. Opened glove box and could see that the actuator was not responding when the temp knob was moved thru it's range. Checked voltages at actuator plug per MOD a... |
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| 1997 Saturn SL2 1.9L Power Door Locks VIN: 1G8ZK5277V I hope that Saturn techs can help me here. This vehicles' door locks do not work but when either switch is pressed, either up or down, all four actuaters shuttle for a little while, but the RR shuttles the longest and then stops. First, I Substituted a new rel... |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 1995 Buick LeSabre Custom 3.8L No Start, Stall VIN: 1G4HP5215S sorry this took so long to respond,, finally replaced gm crank sensor again,,ckd all vanes on crank no problem found car has not been back since ,,, thanks very much to all that replied |
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| 1994 Cadillac Seville STS 4.6L Poor Idle Quality, MIL Lamp on VIN: 1G6KY5298R We want to say thanks for all the info, we checked the computer's 800 lines after the second key cycle and they were dead. So we replaced the first reman computer with another, did the idle relearn, and push the off and rear defog to clear the trans service me... Trouble codes: 1034, T072 (so36 -), S036. |
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| 1994 Cadillac Seville SLS 4.6L Surge, Cuts out, Misfire VIN: 1G6KS52Y6R This vehile is fixed finally. Special thanks to cadillacfixer who led us down the right path. The egr passages in the heads were plugged solid except the entrance to #2 cylinder which was causing #2 cylinder to lean out with egr and causing it to miss. Thanks ... |
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| 1994 Cadillac DeVille 4.6L Engine Block VIN: 1G6KF2Y0RU Had several replies with 2 thoughts. Either fix the crack from the outside or replace the engine. We tried a 2 part epoxy from Devcon on the outside of the block and Barrs Leak in the cooling system and so far so good. Thanks , Nick |
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| 1982 Chevrolet Corvette 5.7L hood VIN: 1G1AY8781C Thanks to all that took the time to reply. Unfortunately, no one hit this one. I spent 3 hours digging for the cable. Once inside I noticed a small hole behind the latch assembly, with a plastic plug in it. remove the plug, and guess what you see. Thats right,... |
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| 1988 Chevrolet Camaro Iroc-Z 5.7L Excessive Emissions VIN: 1G1FP2185J I ordered a new prom for this car and it now passes NOx at below 100 ppm at both 15 and 25 mph. There was nothing else wrong except for the broken knock sensor which was replaced first. Also, Chevy did not make a 5.7 Ca emissions IROC-Z for this year, it wound... |
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| 1989 Chevrolet S10 Blazer 4.3L Hesitation, Cuts out, Misfire VIN: ASRT345678 That's way too much timing. You have very high mileage. Maybe timing chain has jumped one tooth? A need to advance timing that much means you have mechanical problems. Your theory of better gas quality should mean knock sensor shouldn't be retarding timing. It... |
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| 1991 Chevrolet Lumina 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2G1WN51TXM computer needs to see at least 13.5 volts or it run rich and drive iac up turned out the new alternator was defective replaced all is good now Trouble codes: 33 (map sensor), 34 (iac error). |
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| 1997 Chevrolet K1500 5.7L 4wd VIN: 2GTEK19ROV After checking this truck out further the customer decided not to pursue the noise any further and just live with it because it still shifts its just loud and he said he hardly ever uses 4lo thanks for your responses |
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| 2000 Chevrolet Impala LS 3.8L water leak from HVAC blower VIN: 2G1WH55K3Y It turn out to be a clogged drain plug. When I removed the angle rubber drain plug that was located on the fire wall near the engine, water rushed out like a broken dam. Thanks to all the technicians that had replied. |
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| 2001 Chevrolet Express 3500 5.7L Poor Idle Quality, Stall, Low Idle Speed VIN: 1GCHG39R41 Not much response on this one. We went over and over this van and kept coming back to a problem with just the IAC system. Anything else we could come up with that would affect the idle would also throw off the fuel trims, and they were staying right where they... |
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| 2003 Chevrolet 1500P/U 4.3L Broadcast VIN: 1GNDC13WX3 Got some good ideas for this vehicle and was able to try some. Didn't correct the problem, but I could only get the vehicle for brief periods becuase it is a work truck. The problem only occurs with the motor running, sothat discounts most accessories. Tried w... |
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| 1993 GMC Jimmy SLE 4.3L Hesitation, Surge, Cuts out VIN: 1GDCT18Z6P Hello to all The Typhoon is fixed, the cutting out at WOT was caused by a bad distributor cap, the center electrode spring from post to carbon tip inside cap was burnt out causing spark to jump and max out coil and fail under load. Replaced cap rotor and coil ... |
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| 1996 GMC Sonoma SL 4.3L abs lamp on VIN: 1GTDT14W1T first off I wowld like to thank Bobby [...] for ther help and one other that I mistakenly deleted his 'e'mail. we or I should say my co-worker decided to sell the thing. that's the easy way to fix about anything. If I had known he was trade thi... |
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| 1997 GMC K1500 Suburban 5.7L p/s pump VIN: 3GKFK16R6V thanks to all that took time to offer help,we put a new steering wheel speed sensor which seemed to help, then we put a new gm p/s pump, p/s inline filter & flushed it thoroughly before releasing it to the customer. it seemed to work better than ever before, t... |
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| 1997 GMC Jimmy SL 4.3L compressor VIN: 1GKDT13W9V Thanks to all. Two guys sent detailed info on how to rebuild comp, thanks. Most said to buy a new one, not to try to reseal the old one, because of too many come-backs. I bought a new comp and installed it. A/C working good now. |
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| 1997 GMC Yukon SL 5.7L Excessive Emissions, Poor Fuel Economy VIN: 3GKEK18R3V 4 NEW OXEGEN SENSORS, a fancy stainless new cat-back system, and a good fuel system cleaning (motorvac) have this customer smelling roses again. Smells not so rich anymore, and sounds better from the new system. Readings are the same, but maybe the coolant exp... |
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| 1999 GMC Jimmy SL 4.3L Transfer Case VIN: 1GKDT13W7X First I'd like to thank Jason [...]. for the help they gave us.They mentioned service bulletin about this transfer case and front differential and burnt clutches, I had looked for bulletins before I posted but missed it somehow. (sor... |
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| 1990 Pontiac Bonneville LE 3.8L MIL Lamp on VIN: 1G2HX54C9L I want to again thank all of you whom took time to either read or respond! Unfortunatly my customer was a little disgruntled with us and chose to take to the dealer. He informed us that it was the egr valve which we had already tryed 2! I guess it must be a pr... |
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| 2000 Pontiac Sunfire SE 2.2L No Start VIN: 1G2JB12431 peace to all who sent replies and help to me,unfortunately,i didnt fix this one.during the electrical tests,the customer stopped me in midstream and took the car and traded it for a new one,so again,thanks for the help and hopefully i can return the favor.than... |
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| 2001 Saturn L300 3.0L abs light VIN: 1G8JW54R01 Thanks to all who tried to help-we did trace the problem with this car to the ABS module which was not supplying any data to the appropriate pin on the diagnostic connector. After trying different updated scan tools we tested all the wiring power supplies and ... |
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