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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for January 14, 2009
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Open Help Requests for GM
Help Request Answers
2004 Buick Regal LS 3.8L no crank VIN: 2G4WB52K94
customer stated car would not crank intermittantly, battery, alt and starter all ok. when car wont start, all dash lites will blink together along with relays in unisom. power is being pulsed to instrument cluster when key is in on position,powerwindows power ...
1994 Chevrolet S10 4.3L transmission VIN: 8945670872
Still woring on getting this s-10 trans right. Still grinds going into 4th, and a bit in to reverse when hot. question is, i hear this can be caused by using the wrong fluid. Based on reading I put mobil 1 5w30 15000 mile oil in the trans. I am wondering if p...
1998 Chevrolet p30 4.3L No Start VIN: 1G8HP32W7W
hello have a high mileage p30 with a switchable natural gas system. With the cold weather it will not start. the ehgine will pop then will flood.if we pull plugs dry them then it will start if i hold clear flood then runs fine. if i shut it off right away, wil...
1999 Chevrolet Tahoe 5.7L transfer case VIN: 3GNEK18R5X
Loud popping noise from transfer case under load. Noise occurs in 4x4 high and low range and in auto 4x4 mode. Four wheel drive does work despite this loud popping noise. Noise does not occur in 2wd. Clutch plates in transfer case look OK and actuator motor ap...
2003 Chevrolet Venture LS 3.4L awd VIN: 1GNDVO3E23
The van was flat towed by a repo company. It sheared the splines off the rear axle and destroyed the rear differential. The rear diff has been replaced along with the axles. The problem is when you go to move with the front in some snow the driver information...
2005 Chevrolet Silverado 1500 5.3L starter/ generator VIN: 1GCEK19T25
This truck came to a stop light and would not restart. There was a message on instrument cluster, that said 42v system disconnect or off .The customer was not sure. They went to parts house and installed new battery and tried to jump start. Would not start. To...
2004 GMC C6500 7.2L forward gears VIN: 1JD56C1C64
hi everyone, this is from a fellow mechanic, he has a 2004 GMC C6500, with a C7 Catapillar Motor, and an Alison Transmission, all we know is that when the vehicle gets hot, there is no forward gears. sorry for the limited info, any advice would be awsome!
2006 GMC Sierra 1500 WT 4.8L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on, sluggish VIN: 3GTEC14V76
Customer complains of rough idle, sluggish, cel on. Above listed codes are confirmed. Misfire counters are very high on cyls. # 1,3,5,7, very low on #2,4,6,8.. HC slightly high O2 high at tailpipe, C0 low. Can enrich to get O2 to go high but at idle, O2 at .03... Trouble codes: P0131 (o2 sensor low B1S1), P0171 (System too lean B1S1), P0300 (Engine misfire detected)
1987 Oldsmobile Cutlass Ciera S 2.5L Cuts out, Stall VIN: 1G78MN3FRT
hello fellow techs... thank you all in advance...heres the deal this p.o.s starts right up and suddenly dies spark is good fuel is good and noid appears to be good...no codes present...possible timing chain jumped teeth??? when it runs seems to be fine... thx ...
1998 Oldsmobile Aurora 4.0L Cuts out, Misfire VIN: 1G3GR62C2W
I'm having to work on this problem in between their usage of the vehicle. Last week I scoped the ignition system and nothing seem to jump out at me. I also cleared the misfire data to see what would come back and they are all reading 0. Last week I had some co...
1995 Pontiac Firebird Formula 5.7L low level coolant light VIN: 2G2FV32P8S
low level coolant light stays on after repsir bleed system and no air in system light came on and will not go off. followed all procuders. coolant level senso has been replaced?
2002 Pontiac Aztek 3.4L service veh soon VIN: 3G7DAO3E62
Morning techs, This Aztek went to dealer for chime, and SVS lamp on. Had code for low oil pressure. Customer has us do the work, and all seemed fine, but customer came back with Service Vehicle Soon lamp intermittantly, and chime with no codes. I did notice th...
2002 Pontiac Bonneville SE 3.8L Lighting VIN: 9045678908
The left turn signal front and rear stays on for about 15 minutes after the turn signal has been used. IT DOES NOT FLASH, but stays in the on position along with the arrow on the dash. Switch? hazzard switch? Has anybody had this problem. Thakyou all so much.
1998 Saturn SL1 1.9L Starting VIN: 1G8ZH5284W
owner removed old crank sensor and dinged crank shaft i notice small mark and looks deep enough to mess signal i have never seen this before so hopeing you guys can help heard storys of shimming sensor but never tried this,could someone whos repaired and had g...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Chevrolet Tahoe 5.7L ignition system VIN: 3GNEK18ROT
Thanks for all the good tips on this vehicle. Several of you said it was most likely to be the dist cap well you were correct. I thought it had been replaced by another shop but I had recieved some incorrect info from the customer. I replaced cap and rotor ...
1997 Chevrolet S10 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCCS1449V
first i want to thank everyone for your replies. Turns out the inj. that was replaced at the other shop was not a DELCO and it was slightly different, I don't know why but it was the root of the problem again thx to all. replaced #3 inj. with a DELCO. with a ... Trouble codes: P0300 (ramdom misfire).
1997 Chevrolet Express 3500 5.7L No Start VIN: 1GCHG35R3V
Well it's fixed! First off I originally posted that it had fuel pressure but I'm not sure I actually did when it wasn't firing. So once I found that I started looking more towards the computer (which quite a few of u said to look at). I ordered a A1 ECM and ha...
1999 Chevrolet Monte Carlo LS 3.1L security light VIN: 2G1WW12M4X
Thanks everyone that replied. Arthur, Mickey, Curtis, and Mike all had the right info I was lacking from Alldata. Mike's info on the system and harness I.D. was very helpfull and lead me down the right track. Altimatly I found a broken wire at the ignition loc...
2000 Chevrolet Blazer LS 4.3L engine VIN: 1GNCT18W9Y
Most of the replies received were to replace the distributor cap and rotor. Removed distributor cap, found contacts wet and heavily corroded, cleaned contacts, vehicle started. Also found that one of the screw tabs on the distibutor body was cracked when remov...
2002 Chevrolet Venture LS 3.4L Alternator VIN: 1GNDX03E42
Sorry about the slow fix response. With the cold weather the shop has resembled a zoo. We sniped the wire at the alternator and the fuse panel and installed a new wire from the fuse panel to the alternator. We did open the wiring harness, but did not find a ...
2004 Chevrolet Optra 2.0L CD Player VIN: KL1JK52Z04
Many thanks to Jonathon from Nova Scotia! He gave us a master list of codes to try, hit the right one within 10 tries. Did some searching on a Suzuki forum and found a similar list of codes. Here's the list for anyone else who runs into this situation: 225...
2005 GMC Canyon Z71 SLE 3.5L lack of poor air volumn to defrost VIN: 1GTDT13635
replaced t. stat and brought temp up 15 to 20 deg. but have found no reason for air volume loss at defrost vents at this time.may just be the way its designed.if we find anything else we will post. thank you
1991 Oldsmobile Cutlass Ciera 3.3L Excessive Emissions, No Start, Poor Idle Quality, Misfire VIN: 2G3AJ51N0M
I would like to tanks everybody who send me tips and informations about this weird problem. Finally I fix the car by replacing all 6 injectors with used ones. Even if the resistance and the scope pattern of the old injectors was O.K. I really can't explain why...
1999 Pontiac Grand Am SE 2.4L cluster & ac system VIN: 1G2NE52T7X
2003 Pontiac Montana 3.4L Poor Idle Quality, Stall VIN: 1GMDU23E33
2005 Pontiac Wave 1.6L abs VIN: KL2TW626X5
Pontiac Wave is the same as Chev Aveo but still could not get into ABS module. Auto enginuity say they are working on software to acces but won,t be ready for awhile. Thanks for the help, Have a good day
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