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Prev Professional Automotive Repair Technical Discussions for January 24, 2005
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Open Help Requests for GM
Help Request Answers
1989 Buick Century Custom 2.5L No Start, Backfires VIN: 1G4AH51R2K
Backfires through the intake, and the upper coil was not firing. New module and coils, now both coils firing, still backfires through the intake. Made marks on timing cover and crank pulley, all plugs are firing at TDC each cylinder. No valves seem to be stick...
1991 Buick Regal Gran Sport 3.8L Excessive Emissions, Surge, Stall VIN: 2G4WD54L7M
hey guys got a hair puller for you. 91 regal w/3.8 ac auto. car runs good until warmed up 4-5 min. than surges and stalls. only way to restart is to hold foot to the floor. will not idle under 2k. has new crank sensor and module. no vac leaks found.fuel press....
2000 Buick Century Custom 3.1L Gauges, shift ind. light VIN: 2G4WS52J4Y
I replaced ign. switch about a week ago because of no start condition & gauges & speedo not working. Came in today, (starting ok, but gauges inopertive). Ck'ed all fuses. Power & grds at IP connector & DLC (OK). Scanner does not comunicate with ECM. Is this po...
1988 Cadillac Seville 4.5L Cuts out, MIL Lamp on, backfires VIN: 1G6KS5156J
I fixed the mil light by replacing the mat sensor, after letting the car run in the shop for a while with no problems i went for a test drive and found out after a mile or two the car starts to cut out and backfire on multiple cylinders badly, ok off the gas a... Trouble codes: P0038, P0037
1997 Cadillac DeVille 4.6L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1G6KD54Y1V
The car was towed in as a cuting out issue. The car cranks then fires up with a bad miss than backfires out of the intake. some times it will rev without a miss than when the rpms drop down it backfires out of the intake and shuts off. It has spark, injectors ...
1994 Chevrolet Astro 4.3L Harsh shifts VIN: 1GNDM19WOR
This Astro van came in with the complaint of harsh shifts. We first changed the fluid and filter because sometimes i have saw a shift improvment after. This did not help. Then we installed a gauge into the mainline tap and saw that the pressure was fixed at 17...
1996 Chevrolet K2500 Cheyenne 6.5L Surge, Cuts out VIN: 1GCGK24F3T
Hi to all, This truck is giving us some trouble. about 6,000 miles ago it was stalling and not starting. We installed a remote mounted injection driver module. It ran good for about 5,000 miles , now it has a surge when you are driving it with very light throt...
1999 Chevrolet K1500 Suburban 5.7L No Start VIN: 3GNFK16RXX
all fuel pumps have been ac delco parts. the relay has been changed with the last pump install 400 miles ago. ground for the punp from tank crossmember is good.there are no apparent run problems till the vehicle dies. then there is the no start condition from ...
2000 Chevrolet W4500 7.2L No Start VIN: 1GBG6H1UXY
this vehicle was parked then would not start again. we have fuel to the injection pump but no fuel from injection pump to cylinders. anyone having knowledge of this isuzu engine and its injection pump system would be of great help thanks clint
2002 Chevrolet Trailblazer LS 4.2L Drivers side temp VIN: 1GNDT13SX2
This dual climate control system will at times blow cold air out of the drivers side ducts no matter where the temp knob is set. The passenger side always works ok. If you turn the temp knobs from 60 degrees to 90 degrees and back a couple of times the system...
2002 Chevrolet Avalanche 1500 5.3L transfer case VIN: 3GNEK13T52
scan test no codes,during data scan it shifted to 4lo and now won't come out i've checked resistance of the motor a&b circuits ok & lock solenoid circuit ok ive checked voltage at the 6 wire coonector and everything seems finebut if i hook a voltmter across mo...
1989 GMC G3500 Vandura 5.7L MIL Lamp on, LACK OF POWER VIN: 2GDHG31K2K
Hello. Thanks for any help in advance. Customer complaint: lack of power. Checked codes and found one code: Code 42 EST problem. Went through the diagnostic tree and came up with a faulty PCM. Replaced PCM and code and problem still there. Double checked my di... Trouble codes: 42 (Electronic Spark Timing problem)
2003 Hummer H2 6.0L Starter, low battery VIN: 5GRGN23U43
Gentlemen, Customer says battery will sometimes run down if vehicle sits over 2 days & also that the driver power seat and seat heater were not working-they both have worked for me from the beginning. I have been able to catch it with a 711ma battery draw for ...
2000 Oldsmobile Intrigue GLS 3.5L steering rack VIN: 1G3WX52HWY
This vehicle showed up here with a complaint of a medium pitched squeak/squeal while turning the steering wheel. The rack was found to be the area that the noise was coming from and it also had an oil leak at the sector seal. We replaced the unit and both symp...
2001 Oldsmobile Alero GL 2.4L No Start VIN: 1G3NL52T01
hope someone can help me... car wont start cranks ok has spark injector pulse and fuel pressure compression is 175 on a cold almost wants to start but just wont backfire or anything my snapon scanner says that 1621 is almost always a bad ecm ... Trouble codes: 1621 (ecm prom memory problem)
2002 Oldsmobile Alero GL 2.2L dash warning lights VIN: 1G3NL52F8C
Is there anything anyone can help me with this I would greatly appreciate it.
1996 Pontiac Grand Am SE 3.1L No Start VIN: 1G2NE52MXT
Posting this for one of my techs. This one came in last week with major coolant burn {head gasket(s) failed}. We replaced the engine along with the following components: radiator, coolant hoses, water pump, ignition control module, cam sensor, crank sensors (b...
1998 Saturn SL2 1.9L reverse VIN: 1G8ZK5272W
hi everyone i have 2 saturns with almost the same problems the first one it had severe shifting problems including delayed reverse. so i changed the valve body (new from saturn)the shifting problems got solved but now i got this big clunk along with 5 second d...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Regal Custom 3.8L Poor Idle Quality, Surge VIN: 2G4WB54L2P
The alternator did cure the problem. We had replaced the alternator a while ago with a local builder that we regularly use and have few problems with, but since that replacement is when the car starting having problems, and the alternator did go out once after...
1994 Chevrolet S10 4.3L Stall VIN: 1GCCS14W5R
I would like to thank all for their valuable input. All the suggestions were on the mark, fuel pump replacement was the ticket. The reasons for my hard headest to check all the items that ya`ll suggested was I was working behind one my techs that said he had c...
1996 Chevrolet Cavalier Z24 2.4L Hesitation, Misfire VIN: 3G1JF12T6T
thanks for the replies.. I think I misled you in my post..this car does feel like it has a miss or jerking especially in 4th.. I hired a new guy, so far seems quite sharp, and he thinks that we are just lugging the engine down. In 3rd gear at the same rpm's it...
1997 Chevrolet Astro 4.3L Surge, Misfire VIN: 1GNEL19W6V
I know it's been a long time, sorry. I'm calling this a fix only because there isn't an 'acceptable' option. One of the folks who replied (there were many of you, very helpful thank you) said he felt the 2.5 psi was too high for the cat back pressure. I didn't...
2002 Chevrolet Tahoe LS 5.3L Hesitation, Surge, Cuts out VIN: 1GNEK13Z42
tons of great info, pretty much used it all, ended up pump was definetly bad, replaced, but also did regulator, filter, checked connections so who knows where the real culprit is or was, we will see. appreciate all the help. sorry for delay in response, was no...
2001 GMC Yukon SLE 5.3L hvac controller VIN: 1GKEK13T31
Well as many of you have pointed out,we don't have a problem here.Sorry to waste everyone's time but I guess having the proper information would have helped here.This is absolutley a normal condition for this unit.Even though we never had a problem,the power o...
1991 Pontiac Sunbird LE 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1G2JB11T8M
replaced 6 injectors and replaced the 02 because of the rich running and re learned the IAC, went for a road test and car runs alot better, I'm hopeful this will fix the problem. thank you to everyone for all of your replies, i just need another set of ears ... Trouble codes: 45 (rich condition).
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