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Prev Professional Automotive Repair Technical Discussions for May 8, 2008
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Open Help Requests for GM
Help Request Answers
1990 Cadillac DeVille 4.5L blower VIN: 1G6CD5333L
vehicle has no ac information, or fuel info. no lites. cant access trouble codes from ac controls. all fuses are good. power to ac module at red wire . no power at purple, has good ground on black to module. when calling ask for michael please. thank you.,
1997 Cadillac Catera 3.0L high beam indicator/interior lighting VIN: W06VR52R7V
High beam indicator&interior lighting works intermittently.can tap on dash to cause fault to correct.
2000 Cadillac DeVille 4.6L power steering VIN: 1G6KD54Y8Y
Fellow Techs this caddy loses power steering once in a great while, from what I have been told cust drives 6o miles & when she gets to her destination & attempts to park or make slow turning manuvers very hard to steer.We have driven 150 miles & no prob. Have ...
1995 Chevrolet Astro 4.3L No Start, Stall VIN: 1GBDM19W2S
This van came in about 2 weeks age with rough idle. Found bad egr valve and replaced. Van idle fine and ran great. came back yesterday with problem going dowm the road and cutting off and wouild not start until it set awhile. So I hooked up the scanner and gav...
1995 Chevrolet Caprice Classic 5.7L poping sound VIN: 1G1BL52P9S
Hi Guys.Have a problem with this impala ss.I runs good but when you give it gas hard it popes out of the intake,but when you give it gas not too fast it is fine.It has a new cap and rotor,wires,and plugs look like ilde the tps is .66,the iac is 0,the ai...
1997 Chevrolet Camaro 3.8L P/S pump VIN: 2G1FP22K7V
I replaced the p/s pump (cardome) and pressure hose due to it leaking. Three months later car comes back because steering wheel is hard to turn at idle, but if you rev up the engine the steering wheel gets easier to turn. Thinking the P/S pump was bad I ordere...
1998 Chevrolet Lumina 3.1L compressor VIN: 2G1WL52K39
Has anybody out there found an economical way to repair the compressor seals where the the 2 halves of the compressor join; OEM does not sell that big seal, does it have to be a complete new compressor everytime; Thanks in advance everybody.
1998 Chevrolet Express 2500 5.7L No Start, Stall
Trying to help a friend. Have limited exposure to American cars. Van will start when cold. After it warms up, if I shut it off it will not restart. Plugs are firing and I can hear fuel pump running. Owner also said that if he started car cold and drove away ca...
2000 Chevrolet Silverado 1500 4.3L Hesitation VIN: 1GCEC14W6Y
I need some help. THis truck came in comlaing of losing power. Fuel pressure is at 60 psi. O2 are reading around 30 mv @ idle and fuel trim is 190. If I unplug the maf the the o2 read around 800 mv and fuel trim run around 128. I have replaced the maf twice no... Trouble codes: P0171, P0174
2005 Chevrolet Silverado 1500 4.8L compressor clutch VIN: 33667HHTTF
hi all this is one of our fleet trucks and the ac clutch will not enguage. the pressures are good and if i jump the ac relay the clutch enguages and the ac is cold. pulled all the data from the mt2500 and all looks good except the low coolant pid says yes. the...
2006 Chevrolet Silverado 2500 HD LS 6.0L shifting VIN: 1GCK23D46F
Help GM Wiring Wizards! This is what I got. My personal truck, '01 Silverado 2500HD, 6.0 with 4L80E. Cooked the tranny. Really want to update tranny to the new 6L80E 6speed. Is there any way to hook into my harness to operate? I don't mind rigging some type o...
2002 GMC Envoy SLE 4.2L Poor Idle Quality VIN: 1GKDS13S82
Okay guys this vehicle is a major headbanger. The customers complaint is that sometimes on acceleration it feels like you turned the key of and then back on. Also it vibrates at idle, which causes a buzzing noise inside the vehicle. You can feel it in the stee...
2005 GMC Envoy Denali 5.3L MIL Lamp on VIN: 1GKET63M35
vehicle came in with mil on.hooked snap-on modis to it,and it tells me no communication.installed update,and still no communication.has anybody run into this,or do i have to ship them to the dealer?thank for any ideas!
1995 Pontiac Grand Am SE 3.1L No Start VIN: 1G2NE55M55
2002 Saturn SL1 1.9L No Start, MIL Lamp on VIN: 1G82H52822
OK guys, this one has me baffled. I did get the car running which is the baffling part. Now we have only seen this car this time after Saturn of Manchester looked at it for this issue. My first suspect item was the crank sensor, so I yanked it out and started ... Trouble codes: P1599, P1620

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Roadmaster 5.7L engine VIN: 1G4BN52P9R
thanks for all the help , did not receive any tips that had not been tried already ,ended up disableiny the water pump and running engine ,watching for bubbles would get 1 quarter size bubble every 15-18 seconds ,possible combustion leak ,head gasket ? just st...
1999 Buick Regal LS 3.8L abs light VIN: 2G4WB52K5X
Well, the car went to auction as the dealer did not want to spend any more time or money on this one. Possibly if I had access to a Tech 2 I may have had a code. Many replies about ignition switch problems with these cars, but a new one did not solve this pr...
1996 Chevrolet C1500 5.7L Hesitation VIN: 1K1CHS123O
first i want to thank all who responded to my request. i took all responces into consideration and started with addressing the fuel pressure. I am used to this type of system not running if there is not 60 psi and that should of threw up a red flag of only h...
2000 Chevrolet C3500 7.4L Fuel Gauge VIN: 1GBKC34J5Y
A special thanks to ALEX as it turns out after going through every test every one suggested it turns the calibration for the pcm was for one tank and not two. I had the dealer reflash it and now it is fine. At least I really understand how this system works.
2001 Chevrolet Prizm 1.8L cooling fans VIN: 1Y1SK52881
This one is fixed, with little fanfare. It's amazing how easy it is to fix cars with the right information. Had a couple offers to fax me wiring schematics and a friend of mine did. With a good schematic I found out that both my fuses are supplied power wit...
1990 GMC G2500 Vandura 4.3L engine VIN: 1GTEG25Z8L
This was an interesting one. Had three good replies, one for valve guide or spring, the other 2 for piston slap, loose piston pin or rings hitting too high. We did remove the valve springs and check guides and valve movement all good. Pulled the engine down ...
1991 Oldsmobile 98 Regency Elite 3.8L MIL Lamp on VIN: 1G3CW53L2M
After making several wiring repairs this vehcle still set the code for the cam sensor. Replaced the PCM after verifieing that it was receiving the proper signal. This had no effect on the problem. The customer is taking it to the dealership. Trouble codes: 41 (Cam sensor circuit).
1995 Oldsmobile Cutlass Ciera 3.1L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G3AJ55M9S
Let me start by explaining our problem again. This 3.1 would intermittently buck and some times die at idle. SES light would come on at times. I am going to call this one fixed. Stephen [...] suggested unplugging the alternator to see if the problem went awa... Trouble codes: P0341 (Cam position sensor).
1990 Pontiac 6000 LE 3.1L Excessive Emissions, Poor Idle Quality, Surge, Cuts out, Stall, Poor Fuel Economy VIN: 1G2AF51T9L
High all, thanks for all your input, couldn't get permission from customer to pull the intake off to get to the rest of the injectors, but the two I could get to I rechecked those at different temps, ok. I had previously checked the EGR, but it's one of those ... Trouble codes: 35 (Idle air control IAC problem), 45 (Rich exhaust), 44 (Lean exhaust).
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