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Prev Professional Automotive Repair Technical Discussions for February 20, 2006
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Open Help Requests for GM
Help Request Answers
1987 Buick Regal GNX 3.8L Poor Idle Quality, Hesitation, Stall VIN: 1G4GJ1172H
This vehicle has a dead spot when taking off from a stop. It also dies when you let up on the throttle but not every time. When it first came in it would die every time until I changed the IAC motor it was staying at 140 all the time it now idles at 35-40. I h...
1998 Buick LeSabre Limited 3.8L no shift VIN: 1G4HR52K6W
customer complains about a no shift...and trans will not engage for certain periods of time. fluid level good and maintained. We thought about shift solenoid problem. performed scan with dtc 742 clutch fault code...On a subsequent test..engine would not start ...
1995 Cadillac DeVille 4.9L blower fan motor VIN: 1G6KD52B9S
this car came in with customer saying the blower fan doesn't work. i first thought it had the resistor under the hood that normally goes bad but this model doesn't have one. it has whats called a a/c prossessor (acp). i first checked the fuses. all seems to be...
1995 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W7S
1994 Chevrolet P30 7.4L downshifts alone VIN: 1GBJP37N7R
Hi Guys this customer is a member of a caravan that is leaving tomorrow with or without him. In the mountains the transmission would shift into LOW gear on it's own going downhill. Usually it shifts down when the owner takes his foot off the accelerator. We ha...
1995 Chevrolet Lumina LS 3.4L MIL Lamp on VIN: 2G1WN52X4S
Hello All. I'm going to apologize in advance for a long post. This vehicle has got me severely stressed out. The check engine lamp intermittently turns on for the P1403 code. I have cleaned out the passage numerous times thinking just maybe I didn't get enou... Trouble codes: P1403 (EGR Solenoid 1 Circuit Error)
1997 Chevrolet Malibu 2.4L alarm VIN: 1G1ND52T4V
Car came in with dead battery. Found broken positive terminal. Replaced battery and car starts and runs fine, but the alarm system is sounding the horn constantly and there is a clicking noise like a flasher coming from under the dash. I have tried locking and...
1997 Chevrolet Blazer 4.3L shift & tcc solenoid VIN: 1GNCT18W3V
This vehicle came in with codes for all five solenoids listed in the repair history above. After clearing codes, the Blazer ran good for a couple of weeks. When the truck came back, all five codes were back and the truck takes off from a stop in 2nd gear. All ...
1998 Chevrolet K1500 Cheyenne 5.7L Stall VIN: 2GCEK19R2W
I installed a new intake gaskets, valve cover gaskets, dist. cap & rotor. After I was done I went to start it and the truck stalled out. It started right back up and seems to run pretty good. Then the check engine light came on with a code P1345. I am not sure... Trouble codes: P1345 (Not sure)
2001 Chevrolet Silverado 2500 HD LS 6.0L Accessories VIN: 1GCHK23U51
I will probably need GM techs on this. This is my personal vehicle I purchased from a local company by auction. This is a crew cab 4wheel drive "plain jane" but got it for only $3500 and drive it away (WOW). Very good body too! Anyhow, I purchase a '04 Avalanc...
1998 GMC Jimmy Envoy 4.3L vcm ebcm VIN: 1GKDT13WXW
Vehicle came in with 3 codes. C0222 (Rt front signal missing) C0226 (left front signal missing) C0236 (rear signal missing). After road test with both front signals there, but no rear mph. Cleared codes and C0236 reappeared immediately upon movement and comes ...
2000 GMC Jimmy Diamond Edition 4.3L HVAC /ABS Light VIN: 1GKDT13W5Y
About to the end with this one and I'm fishing for ideas. The climate control on this is cycling when system is shut off. Also will shut down and restart in manual operation. When it is acting up the ABS light is also coming on and I lose communication with AB...
2003 GMC Envoy XL SLE 4.2L suspension VIN: 1GKET16S03
Sounds like stones in a can over bumps while driving in town just inside from L.R by wheel (heard while sitting in back of truck). No stones have been found anywhere in this area. Disabled L.R. link (as per bulletin) and drove with tech in back of truck (I tho...
1997 Oldsmobile Achieva S 3.1L theft detterent VIN: 1G3NL52M8V
this car has the theft detterent system and it is activated, after replacing the lock cylinder, we get a code p1629 code theft detterent crank signal malfunction. going through the diagnostic chart it tells me to check serial data line for shorts to ground and...
1993 Pontiac Bonneville SE 3.8L Surge, Stall, warning chime VIN: 1G2HX53L8P
randomly warning chime will come on, all warning lights come on. When this occurs will die if coming to stop, will not if driving, will stay on for short (seconds) as well as long periods (several miles). Will restart after it dies. No codes are present
1995 Pontiac Grand Am SE 2.3L over heating VIN: 1G2NE52TXS
The water pump was replaced with a new one, the radiator and head gasket was also replaced it also had a large amount of rust in the bock. both hoses have ben replaced also all passages have been found clear t-stat was replaced first. fan works and it dosent o...
2002 Saturn L200 2.2L Misfire VIN: 1G8JU54F82
Posting for a friend in another shop. This vehicle has a random missfire code for cyls 1 & 4. The vehicle had the same problem 700 miles ago and the tech replaced the coil pack and module for those cylinders. Vehicle came in today with exactly the same problem... Trouble codes: P00, 300 (Random Missfire)

Fixes & Summaries for GM
Fix/Summary Answers
1993 Cadillac Seville STS 4.6L Poor Idle Quality VIN: 1G6KY5299P
thanks to all who responded. no vacuum lines were attached to either the fuel pressure regulator nor the map sensor. replacing the upper and lower intake gaskets resolved the problem. once again thanks!
1995 Chevrolet Caprice Classic 5.7L heat VIN: 1G1BL82P7S
After taking apart all heater hoses, found a valve stem from another shop in a metal tube...didn't expect this one.
1997 Chevrolet Venture 3.4L power sliding door VIN: 1GNDX06E2V
I want to thank: Bill [...] wrote, 'one is the module getting power and ground and you didnt say whether or not the switch is transfering gro...
1999 Chevrolet Blazer 4.3L engine VIN: 1GNDT13W4X
No awnsers on this one guys, didnt find the reason but I have done hundreds of intakes and I'm not doing any more 4.3s I can promise you that. Thanks for all the replies and advise Steve.
1999 Chevrolet Silverado 1500 5.3L unknown VIN: 1GCEK19T6X
This truck is finally fixed!!! We sent it to another shop that is equipped with a TECH 2 scanner to run the abs pump for bleeding. The tech that was working on it removed vacuum from the booster while it was running and the person inside the truck said when he...
1999 Chevrolet K3500 7.4L fuel guage VIN: 1GCHK33JXX
What I found is the 1999 model can be either a 1998 or 2000 when it comes to service data ,the tech at the chevy dealer told me this .The 1999 is a simple old time system like we are used to working on for years. I called a service tech at Speedoservice in Atl...
2000 Chevrolet C3500 5.7L Poor Idle Quality, Misfire VIN: 1GCGC33R5Y
Hello all and thank you for all your help. This had us scratching our heads for longer than it should have. I guess you should always stick to the basics. With some advice from Bobby [...], we removed upper plenum, disabled ignition system and tested for leak... Trouble codes: P0172 (ft rich b1).
2001 Chevrolet Camaro 3.8L Park/Courtesy VIN: 2G1FP22K51
Thanks to all that replied...this customer was not a regular or from this area...I felt as along with others that this car needed to end up at the dealer or someplace that has a Tech 2. I needed to close this post and say I'm sorry to not have the final fix. T...
2003 Chevrolet Express 1500 5.3L driveline? VIN: 1GNFH15T33
Thanks to the Chevy experts- the driveshaft slip yoke was the culprit. We called 2 area local dealerships and one played stupid about the lube, and the other one claimed to never have stocked it, so instead of delaying the fix further we pulled the driveshaft-...
2004 GMC Yukon XL 2500 SLE 6.0L Blower motor VIN: 1GKGK26U44
I want to thank all that replied. I feel Aran from Utah hit the nail on the head. This truck belongs to the owner of the company I work for. It is going to go back to the dealer for about the tenth time with problems in the all wheel steering system. They will...
2002 Oldsmobile Bravada 4.2L instrument cluster VIN: 1GHDT13S32
After checking battery connections and replacing ignition switch, I ended up having to replace instrument cluster. That cured it. Thanks for all the responses.
1995 Pontiac Firebird Formula 5.7L Electronic VIN: 2G2FV22P7S
finally took the car to a different dealer and had ecm programmed and it runs and shifts like it should. don't always trust the dealer to do things right. the first one even told me that 'they do not make those kinds of errors'. well, i got my money back from ...
2002 Pontiac Grand Prix SE 3.1L Hesitation, Surge, Misfire VIN: 1G2WK52J02
Vehicle is finally fixed! Turned out it was the converter plugged up. Appreciate all your help!!
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