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Prev Professional Automotive Repair Technical Discussions for March 29, 2006
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Open Help Requests for GM
Help Request Answers
1988 Buick Reatta 3.8L touch screen VIN: 1G4EC11C8J
this car has a digital dash and a touch screen in the center cunsole to control the radio,heating and a/c. sometime the screen lights up and sometimes it doesn't. when it does light, it usually doesn't respond to any of the buttons that control it. sometimes t...
1993 Buick Regal 3.1L Cuts out, Stall VIN: 2G4WB54TOP
Car came in on tow in AM. Customer stated would stall at idle and stoplights. Charged battery and ran fine. Later in day let run and finally it stalled without much fanfare. Continued to do so throughout the afternoon. Cranked fine everytime. Vehicle was towed...
1995 Buick Park Avenue Ultra 3.8L cd--err--message VIN: 1G4CU5219S
Radio displays err message and wont play cd's including new and old cd's that will work in home player.
1989 Cadillac DeVille 4.5L climate control VIN: 1G6CD5154K
Hey Guys, Customer brought in this cadillac complaining of no speedometer and no climate control function. Someone had tried to replace the radio and it was removed. All of the wires to the radio had been either stripped back or cut loose from their original ...
1968 Chevrolet camaro 327CID ring and pinion
Good afternoon older chevrolet techs.I am an import tech so I don't get to see these old buggies very often.A friend of mine purchased this old car and had me redo the engine in it ,now he wants me to replace the gears in the differential.I have never replaced...
1992 Chevrolet Lumina Euro 3.4L Surge VIN: 2G1WN54X7N
This car has been a pain in my side for several years but I have always been able to fix it until now. The car was running fine until the customer left the dome light on and drained the battery. After he jump started the car with a booster box the car started ...
1997 Chevrolet Lumina 3.1L Misfire, MIL Lamp on VIN: 2G1WL52M3V
This 97 Lumina 3.1 has a intermintent rough running, and flashing check engine light. Thats what the customer says, one time that we had it we started the car to bring it into the shop and it was missing and light was flashing, bring in shop and shut off to ge... Trouble codes: P0300
2000 Chevrolet Impala 3.4L Cooling Systems VIN: 2G1WF55E8Y
Hello all, I have this Impala in here where oil is getting into the radiator. I can see the intake (of course) leaking, but do not find any other leaks. I have never seen oil leak into the cooling system from an intake but that doesn't mean it can't happen. I ...
2001 Chevrolet Silverado 2500 HD 8.1L trans data VIN: 1GCHK29GX1
Allison Guys Please help We have an 01 silv 2500 hd 8100 allison trans. Customer complaint was it would only go in second gear and cel came on. Test drove and truck shfted fine but had no t.c. lockup. All modules active, codes in vcm and pcm. Vcm code was 700 ...
2001 Chevrolet Suburban 1500 5.3L transfer case VIN: 3GNFK16761
This Suburban will shift in & out of all four wheel drive mode or at seem to with koeo with motor running will stay in 4 w high or auto 4 w drive. As stated there has been a new switch install in the dash but the atc module had a code b2725 which ther is a tsb...
2003 Chevrolet Trailblazer LTZ 4.2L air flow VIN: 1GNDS13S23
air blows out wrong vents. we replaced ign. switch because the car would cut off instuments go crazy etc. part of the switch was not supplying full voltage to all fuses under hood (and possibly under rear seat where hvac fuse is). customer says the air distrib...
1992 GMC Safari 4.3L not sure VIN: RBT02D9656
hello every body, this 92 safari has a driveline vibration between 110)120 KPH. the vehicle has new tires, u-joints,& shocks. nothing has made a differance. seems to be slightly better with vehicle weighted down. any help is greatly appreciated. thanks in adva...
1996 GMC C1500 Sierra SL 5.7L Rear brakes VIN: 1GTEC19RXT
Hello: Not feeling to smart here. This should be a no brainer!! Customer complaint: Groaning noise in rear (Wheel speed & rythmic) at slow speeds. We confirmed that the noise is the LR brake area. It noise sounds like a brake shoe dragging & groaning. It only...
1999 GMC Jimmy SL 4.3L Serpentine Belt VIN: 1GKDT13W0X
This has been an ongoing problem for the last year. The customer has been very patient with us on tring to figure out the problem. Every 3 or 4 months the serpentine belt starts squeeking. It seems to become glazed and it seems to be on either side of the belt...
1999 GMC Yukon SLE 5.7L fuel gauge VIN: 1GKEK13R1Y
we have had 3 or 4 suburbans and tahoe's do the same thing before or after fuel pump replacements is there a ground somewhere causing the needle on the gauge to shake violently (in one spot ) we have one suburban doing this and it never had a pump replacement ...
2003 Hummer H2 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 5GRGN23U93
car returned to shop again running poorly p0300 again tested left back pressure and found +4 psi figured this cat had alos failed replaced left cat still ran poorly checked right back pressure and found +10psi why are the cats going bad fuel trims are around +... Trouble codes: P0300
1996 Oldsmobile 88 Royale 3.8L Unknown VIN: 1G3HN52K6T
we have this olds that came in steaming from the exhaust a pressure test revealed leak at upper intake replaced the upper intake coolant consumption problem solved, the problem we have after reassembly is what sounds much like a belt squeal, we have replaced t...
1999 Oldsmobile Intrigue GLS 3.5L headlights VIN: 1G3WX52H9X
The headlights will shut off while driving, but if you manually turn headlights on with switch they will work fine. I tested the wires at the DRL module and found the ground from the BCM would drop off when the headlights shut off. I did some searching through...
2000 Pontiac Bonneville SE 3.8L Misfire, MIL Lamp on VIN: 1GZHZ5419Y
Hello: I have this car which is my stepson's that has missfire code on cylinder 1.It missfires badly on quick accel.in park and will count about 5-10 missfires each time.Under load while driving it will miss when it gets into high gear with slight accel.I have... Trouble codes: P0301
2000 Pontiac Grand Prix GT 3.8L Stall, looses tach int. VIN: 1G2WP52K9Y
The car loses the tach and the traction control light comes on. During the act up it loses the 18x signal from the ign. module to the pcm. But if you turn car off and restart everything works fine. The 3x,18x,and the cam signal going to the ing. module all loo... Trouble codes: P0327, P0332, P0336, C0236

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Roadmaster 5.7L No Start VIN: 1G4BN5379N
i forgot because this was my first time useing this for help but i did test the ing. module 6 times before asking for help all 6 times it tested good i got a few new ideas to check so i did but after those did not locate the trouble i went with the help from t...
2003 Buick Century Custom 3.1L Poor Idle Quality VIN: 2G4WS52J63
I am closing this help request due to customer not coming back. Thank you for all the replies I got. If car comes back i will update what we find.
1992 Cadillac DeVille 4.9L No Start, Cuts out, Stall VIN: 1G6CD53BXN
thanks to all that replied. after reading your replies i decided to start with verifying my grounds as some of you wrote. this was an easy one when i tested the them at the pcm. high resistance on the wires appeared. i ran a seprate wire off the ground wires d... Trouble codes: 52 (ecm reset).
1987 Chevrolet Corvette 5.7L Cooling Systems VIN: 1G1YY2185H
I'm calling this a fix. Most everyone that responded said that the operating temps are fine. Car does not overheat during extended highway and street drives. I did inform our customer to return in the summer time so we can check operating temps under hotter we...
1990 Chevrolet Astro 4.3L MIL Lamp on VIN: 1GTDM15Z2L
hello, well went back through power and grounds to ecm ok, when grounding pin b on aldl connector some solenoids would start clicking and then the check engine light would stay on solid and no communication with scan tool, that told me that the circuits were o... Trouble codes: 32 (egr system problem).
1992 Chevrolet S10 Blazer Sport 4.3L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GNDT13W4N
sorry it took so long to close this. I thought I already did. Ended up being a chunk of carbon in the egr valve like everyone had said as well as the lower intake being almost full of carbon in the egr passages. replaced lower intake and egr and all is well. T... Trouble codes: 32 (egr problem).
1992 Chevrolet Cavalier RS 2.2L No Start VIN: 1G1JC1449N
After days of going back and forth with her husband, these folks elected not to fix the car. Salvage yard showed up and left me a hundred to give them and took the car.
1999 Chevrolet Malibu 2.4L Misfire, MIL Lamp on VIN: 1G1ND52T6X
We replaced pcm to repair this car. I had already tested injectors as several suggested. Thanks for all the replies. Trouble codes: P0300.
2000 Chevrolet Corvette 5.7L driver power window VIN: 1G1YY32G8Y
Well fixed one ! basically We checked the main power wire going into the left door module and we had voltage but as one respondent said maybe a wire just holding on by a few strainds in the door jamb made sense however this car was pretty much brand new, wires...
2001 Chevrolet Impala 3.4L No Start VIN: 2G1WF52E41
Well, what fixed this vehicle was an ignition switch...losing power somewhwere intermittently, thanks for all replies
2001 Chevrolet Silverado 1500 4.3L Surge, Cuts out, Misfire, MIL Lamp on VIN: 2GEC19W311
Thanks for all the replies, simple fix, turned out to be the coil wire. ohm tested fine however when installed it was jumping an arc to a metal support near dist. I couldn't see it due to all the debris stacked on top of this thing! Finally tonight pulled back... Trouble codes: P0300.
2003 Chevrolet Malibu 3.1L keyless entry VIN: 1G1ND52J53
Thanks for all the quick replies guys. The fix is: The programmable horn chirp can be disabled by pressing and holding either of the door lock switches in the unlock position for 10 seconds with the ignition ON and all of the doors closed. When you hear the ho...
2005 Chevrolet Colorado Z85 LS 3.5L MIL Lamp on VIN: 1GCCS13685
i want to start by thanking all who e-mailed and agree with most who said i should send the customer back to the dealership. this time i armed him with a little more knowledge and documention, thanks you guys. i really think the dealership will do the work und... Trouble codes: P00, 300 (multi-misfire).
1993 GMC C3500 Sierra SLE 5.7L brake pedal feel VIN: 1GTHC39K3P
Sorry about the lack of info on the original help request.I was posting for a former fellow tech.The problem was as many had stated that the rear shoes were grabbing. The fellow former tech did not pull the rear drums as they are not easy to do. After I got th...
1995 Oldsmobile Aurora 4.0L coolant leak VIN: 1G3GR62C9S
Thanks to everyone that took the time to respond. The vehical has been returned to the place of purchase. We pressure tested it cold this morning and were able to see a leak coming from the rear head gasket. The numerous responses were that the gaskets LEAK CA...
1997 Oldsmobile Achieva S 2.4L Excessive Emissions, Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1G3NL52Y9V
crack in head thanks for all your help guys should have figured that from the start ,but run down the road to good to believe, thanks again J MAC Trouble codes: P0300.
1999 Oldsmobile Bravada 4.3L Mechanical VIN: 1GHDT13W6X
Basically all I can say is I got some great information from alll responers especially who ever mentioned the tsb describing how to properly diagnose one of these things Im pretty confident we can fix it now if the guy ever returns to have it fixed . As he kno...
1992 Pontiac Grand Prix LE 3.1L Excessive Emissions, No Start, Poor Idle Quality, Misfire VIN: 1G2WH54T8N
Sorry it took so long but we finally got it.To make a long story short, do you remember when I said we had spark, well we did but not strong spark. When I pulled the wire off with the car running I could hear spark jumping to ground but I could not see the col...
1997 Pontiac Grand Prix SE 3.8L MIL Lamp on VIN: 1G2WJ52K6V
Sorry for the long fix on this one. AFter many, many tests we finally decided to try a computer. We could not find any vacuum leaks or any sensor that would test bad. We tried an new computer and everything is working ok now. Thanks again for all the help.
1998 Pontiac Trans Sport Montana 3.4L brakes VIN: 1GMDX03E1W
thanks for all the replies. a couple where right on th money. the brakes finaly after miles, got hot & i found the brake switch was holding the pedal on.
2001 Pontiac Grand Prix GT 3.8L Stall VIN: 1G2WP52K61
Thank you everyone for your responses. We appreciate it. As it turned out, the fuel pressure regulator was the culprit. It was intermittenly leaking from the vac. port... Thank you again.
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