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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 26, 2006
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1998 Buick Park Avenue 3.8L abs indicator light VIN: 1G4CW52KXW
hello guys. this one has me stumped. this vehicle came in the shop today for abs diag. i scanned the codes and there are none. i cleared the codes and the light comes right back on.i did a good visual on the vehicle and found the sensor at the master cylinder ...
1990 Cadillac Eldorado 4.5L Poor Idle Quality, Surge VIN: 1G6FL1330L
hello fellow techs, this caddy will not build fuel pressure. mitchell says that this should have 49 psi. i have 58 psi with the return line blocked, but when running i have only 25 psi regulated. remove the vacuum to the fuel pressure regualator and the pressu...
1990 Chevrolet Corvette 5.7L 2nd gear & 3rd gear VIN: 1G1YY2383L
hello all sorry for what may seem like a dumb post but it has been about 10 years since i have played with a700r4 trans. when you drive the car 1-2 shift is at about 2200 rpms and about 12 mph with light throttle and the the 2nd gear will jump out of gear afte...
1990 Chevrolet K3500 Cheyenne 7.4L Stall VIN: 2GCGK39NOL
thanks for any help i can get...truck came from another shop..dies when warms up at idle, or when put into reverse... they put a pcm, 2 ign modules and a iac...i scanned and got no codes fuel pressure ok no back pressure ign. ...all values on scanner ok, but d...
1993 Chevrolet Corvette 40th Anniversary Edition 5.7L Hesitation, Cuts out, Stall VIN: 1G1YY23P9P
this problem only occurs cold... Vehicle has a bad hesitation (sometimes may stall) at tip-in/part throttle. It feels like TPS is dropping out.(Labscope shows a flawless TPS while problem is happening). The problem is very pronouced for the first 30 to 45 seco...
1994 Chevrolet Cavalier RS 2.2L brake pedal VIN: 3G1JC115RS
hello,he customers complaint was the brake pedal goes to the floor.i inspected the brake system found no brake fluid leaks and the linings are all in good condtion.no codes were found at all.i then road tested the vehical with no condition present,the pedal fe...
1995 Chevrolet Caprice Classic 5.7L No Start, Hesitation, Stall VIN: 1G1BL52P7S
ok Fellow tech's I have reached the end of the road. I have this caprice in my shop that runs like a bear most of the time.Problem is that when it feels like it it will simply cut out like your turning the ignition on and off,backfires won't idle,or just plain...
1997 Chevrolet K1500 5.7L Cuts out VIN: 2GTEK19RXV
Driving this truck down the road and the Air Bag light comes on(with no codes) and a PO748 TRANSMISSION CODE SETS.When it happens the light comes on(air bag)the truck jerks and then after that it shifts hard.Has anyone seen this before? JK Trouble codes: P0748 (tranmission presure control)
2000 Chevrolet Silverado 1500 5.3L long crank hot VIN: 1GCEK19T6Y
1996 GMC K1500 Suburban 5.7L Hesitation VIN: 3GKF16R6TG
This one has me pulling hair out...and I don't have enough left to do that! I hope someone can help me see what I'm missing. The symptom on this one is very hard to duplicate, and it only acts up for a few seconds when it does act up. I drove this vehicle abou...
1999 GMC Safari SL 4.3L Cooling Systems VIN: 1GKDM19WXX
iATN Techs, I have a 1999 Safari comeback today for a NO HEAT condition. Yesterday I replaced the thermostat, heater core & complete cooling system flush. When the van left the shop yesterday evening there was lots of heat in the van. The blend door was also w...
1995 Oldsmobile 98 Regency Elite 3.8L MIL Lamp on VIN: 1G3CX52KX4
Code 623 (P1623). Replaced PCM with OEM ([...]. Samething. No driveability problems. MIL comes on with 623 after a few min. of idle. The PROM I took out was a (1621)7619. Dealer gave me a (1621)5799 EPROM as an update? Samethi... Trouble codes: 623 (prom error)
1995 Oldsmobile Aurora 4.0L highidleharshshift VIN: 1G3GR62C3S
This vehicle came in for a no start. Quickly narrowed it down to no injector pulse, scan tool wouldn't communicate. Diagnostics led to PCM replacement. Vehicle starts and runs now but my problem and the reason for this help request is I still can't communicate...
2001 Oldsmobile Aurora 4.0L Unknown VIN: 1G3GS64C61
the vehicle has come back with p0741 tcc stuck off and p1599 near stall detected. cleared and has come back numerous times, cannot get to reset code. not sure what avenue to pursue, need help unhappy customer. thanks in advance
2002 Pontiac Grand Am SE 2.2L Surge VIN: 1G2NF12F22
Used car just came to me and was at anouther shop and they gave up on it. I have a surg at idle when warmed up. I subtitued know good map sensor and checked for vacume leaks and have found nothing. Fule trim is a little high (long term was about -10%) when I s...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Regal LS 3.8L starter VIN: 1G3WH52M3S
thank for your input on thjis concern it was the ign switch after all it was not giving power on one leg to the pcm/bcm fuse and crank fuse as well as several other fuses on that leg.web site was of great help repairing car.thanmks again.
1991 Cadillac Seville 4.9L transmission VIN: 1G6KS53B0M
we replaced the p.c.m. and they have driven for over a week with no problems.thanks for your help.
1996 Chevrolet Blazer 4.3L transmission area VIN: 1GNDT13W1T
Ok the fix was insulating the fuel lines from the body up by the bellhousing, 1st response nailed it by Robert from Indiana, conquering were William from Michigan, Duane from Alaska and Kenneth from Minnesota. Cor from Alberta said it best, I quote (Hi,was the...
1996 Chevrolet Caprice Classic 5.7L manual 1st VIN: 1G1BL52P3T
checked and 1-2 accumulator piston was too big. installed sonnax pinless accumulator and vehicle shifts fine. thanks to lane he nailed it on the head.
1997 Chevrolet Lumina 3.1L Poor Idle Quality, Surge, Stall VIN: 2G1WL52M3V
after fixing yellow wire in harness by coil pack 1 problem solved now had goodmaf signal. then went after idle surge& roughness although i checked vaccum line on fuel regulator before &was ok i pulled it again no gas or smell. i decided to start it with hose o...
2000 Chevrolet Blazer LS 4.3L Lights VIN: 1GNCS13W8Y
Good afternoon all. I received many good replies. The customer returned this morning, after checking from some of the replies, I asked him when this started happening, before or after he got the battery that was in the truck. He said that he thought it was aft...
2001 Chevrolet Impala 3.4L Unknown VIN: 2GIWF55E81
I received allot of good responses with the general consensus being either the ignition switch or the BCM. As a couple of you mentioned checking ignition voltage via scan data. Since scan data ignition voltage was the same as actual battery voltage I deducted ...
2004 Chevrolet Impala 3.8L Lighting VIN: 2G1WF55KX4
THANK YOU to Dan,Dave,Ed,Joe,and Michael for your replies. Ed & Michael [...] had already located a wiring diagram before i got your post that offered to send it to me but THANK YOU once again!The problem ended up being the multifunction/dimmer switch assembly tha...
1995 GMC K2500 Sierra SL 6.5L Stall VIN: 2GTFK29S5S
Hello and thanks to all who helped. Almost everyone who responded advised me to change the PMD, I thought why not, so I did some research on remote mount kits and I found Diesel Care and Performance Inc. out of Memphis TN who had a kit with a cooler,new PMD an...
1976 Oldsmobile Cutlass S 5.7L engine VIN: 3J57R6D165
wow lots of quick and helpful replys. we decided to go with a 350 l/b with some head work and cam upgrade. thanks to barry for making me feel stupid,thanks to jan for the great web site () and thanks for all who took the time to school me. wi...
2006 Other GM HMMWV 6.5L 1-2 shift solinoid
Thanks to all who replied. ended up finding the ground wire to the tcm for the 1-2 shift solinoid was grounding before the tcm i was thrown off because all of the resistance tests through the wires to the solinoid were all with in range. thanks again
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