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Prev Professional Automotive Repair Technical Discussions for January 15, 2007
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Open Help Requests for GM
Help Request Answers
2004 Buick Park Avenue 3.8L rear suspension VIN: 1G4CW54K64
this car drives and rides remarkebly well on smooth roads. when you encounter bumps in the road or a ridge were the concrete and pavement meet at the edge of a bridge you get rear bump steer for a couple of seconds and then the car returns to normal. I was onl...
1990 Chevrolet Corvette 5.7L Misfire VIN: 1G1YY238XL
Hello all, I have a 1990 corvette that has 3 dead cylinders at all times, #5,6,7 CYLINDERS. Have scope tested igntion and even replaced all igniton components except internal distributor parts, have tested compression-good, have scope tested injector pattern...
1991 Chevrolet S10 4.3L clutch VIN: 1GCCS14Z9M
Thank you in advance. This truck came in with a hard shifting problem. The clutch pedal felt firm but it was difficult to change gears and it grinds badly, especially reverse. If you put it in gear then start the engine, it would want to creep and the clutch w...
1992 Chevrolet G30 Chevy Van 5.7L brakes VIN: 2GDHG31K9N
Driver says brakes lock up at times and vehicle will not move. On several occaisions brakes self apply coasting down hill and the harder you accelerate the faster the van stops. Lines at master were opened one at a time to release pressure and vehicle is able ...
1994 Chevrolet C3500 Cheyenne 6.5L engine VIN: 1GBKC34F5R
This came in as a no start. We checked for codes and the ecm would not communicate. found no MIL, two blown fuses, on bypassed w/ a piece of wire. and the glow plugs were not working. we replaced the fuses found a burned out mil bulb, and a shorted fuel heater...
1994 Chevrolet C1500 5.7L Excessive Emissions, Poor Idle Quality VIN: 1GTDC14KXR
Good evening GM techs.I have an old pickup here that is driving me crazy.I start it cold and the tailpipes look like chimneys,black it warms up it goes into closed loop and starts to idle marginally better but not much.Coolant temp is right on spec.the...
1995 Chevrolet K3500 6.5L all brakes VIN: 1GBHK34F6S
vehicle is ex-electric coop, has been sitting for year or so. customer brought it in with bad engine and rear brakes seized from lot rot. install used engine and completely redid rear brakes including wheel cylinders, manually bleed system completed abs functi...
1996 Chevrolet Blazer 4.3L Rear Lift Gate VIN: 1GNDT13W3T
Hello everyone, I have this 1996 Blazer in the shop and the rear liftgate won't open. When you press the dash switch you can here the lock operate inside the door. Whan you press the button on the liftgate you here the same sound. when trying a key in the tum...
1997 Chevrolet Astro 4.3L No Start VIN: 1GNDM19W3V
Engine cranks but will not fire. New van to the customer, no repair history. Van was driving down the road and stalled. She tried to restart it and said it would crank but not fire. The next morning she tried it again and nothing, No cranking. Then she used th...
2002 Chevrolet Venture LS 3.4L Surge VIN: 1GNDUO3E32
Hi guys, I've got one here thats kicking my butt. Customer brought vehicle in stating that it failed emmission testing. The first thing I noticed is that someone has removed the check engine light bulb. Vehicle has slight surge at idle. Scanned for codes (see ... Trouble codes: P0171, P0446, P0453, P0300, P0507
2002 Chevrolet Astro LS 4.3L Misfire VIN: 1GNDM19X42
This Astro has a reoccuring problem of condensation in the distributor cap. This has happened three times in the last year. I have checked the vents in the distributor and made sure that there is no coolant or water splashing the distributor cap from the outsi...
2005 Chevrolet Equinox LS 3.4L No Start
Looking for a little guidance here. Alldata has no info on these codes. Symptoms are intermittent no crank, no throttle response. (drive by wire-engine will not rev) I have not experienced the problems first hand but customer states this happens a couple of ti... Trouble codes: C0000, U1024
1999 GMC Sonoma SLE 4.3L Steering VIN: 1GTDT19X4X
Hello folks in iatn land. This truck will intermitantly seem to loose power assist during parking menuvoirs at any time any where. Does seem to happen more in reverse and close to lock. Ha anybody seen this? And what fixed it? Thanks for the help.
2001 GMC Sierra 2500 SL 6.0L battery VIN: 1GTHK23U41
2000 Oldsmobile Alero GL 2.4L heater control VIN: 1G3N152T6Y
Hello All, on this vehicle the Heater/AC control switch works fine physically and feels good but does not change the damper doors. It is stuck on a blend between vent and floor. It is vacuum controlled but no vacuum is getting to the control. With the engine o...
1993 Pontiac Grand Prix SE 3.1L Hesitation, Surge, MIL Lamp on VIN: 1G2WJ14T9P
I dont quite know how to categorize this request. This Grand Prix recently did a little "mud running". The customer got it stuck in a puddle. After that he brought it to me because it was hard starting and running poorly. I confirmed it running poorly-missing.... Trouble codes: MU1T1
1999 Pontiac Grand Am GT 3.4L engine cooling VIN: 1G2NW12EXX
engine will overheat after a few miles of operation... losses coolant from the beginning of operation. coolant that is lost initially is cold whether engine is hot or cold from bleeding valve . engine runs great...lots of power with no loss of coolant in exhau...
2000 Pontiac Grand Prix SE 3.1L input speed sensor VIN: 1G2WJ52J8Y
hello folks, car came into shop with a service engine soon light, and shifting harsh. pulled codes found po717 {input shaft speed sensor low input}. proceded to find a tsb for condition, bulletin #02-07-30-022a.talks about 20 pn connector problem not seating r...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick Reatta 3.8L instrument cluster VIN: 1G4EC13C5L
wow 14 responses in 24 hours all say the same thing, either replace or send out for rebuild, got lots of info as were to go for this part. i will send out for repair, will take some time so decided to close request. thanks for the help brian
1982 Cadillac Eldorado 4.1L No Start VIN: 1G6AL5780C
sometimes you get so rapped up in acar you forget basics . almost every reply dealt with a 12 volt circuit controled by the computer(basicly low resistence in circuit) check all switches and solenoids and'CRAIG FROM OKLAHOMA' hit it on the head. Low resistance...
1995 Cadillac Seville STS 4.6L Dash Displays VIN: 1G6KY5298S
Many sincere thanks to those that offered suggestions. The root cause of the problem with this vehicle was not a malfunctioning part, but rather a failure that may have been brought on by a previous repair! The ICM was remaining powered up key off due to a cor...
2001 Cadillac Catera 3.0L Mechanical VIN: W06VR54R21
sorry if i was not clear with my post,my concern was about getting into a job that i may need special tools etc like for replacing studs in north star engine. i advised customer about the posibility of plug/coil boots and the fact that the valve covers may act...
1991 Chevrolet Blazer Silverado 5.7L Poor Idle Quality, Poor Fuel Economy, Timing Unadjustable VIN: 1GNEV18K3M
Thanks for all who replied...Found that the timing disconnect lead to the ECM had an open condition. No signal to the ECM. Basically the ECM was unable to advance the timing due to lack of signal from dist. Therefore, where ever the timing was locked down is w...
1995 Chevrolet Camaro Z28 5.7L No Start VIN: 2G1FP22P2S
Z28 is fixed,runs, thats as far as used car dealer wanted to go. Problem was PCM,Ignition module is part of PCM.Spent a few more hours after reading replies with car. I would intermittenly be able to communicate with PCM then lose it.I was also losing communic...
1998 Chevrolet K3500 Cheyenne 6.5L Poor Idle Quality, Cuts out, MIL Lamp on VIN: F6WF017624
Thanks to all that replied.After raeding replies looked for a used PCM not alvaiable at this time .Sent original PCM in for rebuilding.After installing rebuilt PCM back in vechicle TDC was +.56 for injector pump. Was able to make necessary adjustments to injec... Trouble codes: P1214 (injector pump timing offset), P0216 (injector timing circuit at times).
1998 Chevrolet Astro 4.3L Rear brakes VIN: 1GNDM19W1W
Thanks so much for the replies. Unfortunately customer has not yet brought vehicle back for repair. Brakes are still grabbing (right rear) and I expect to get it in here later this week and try some of the fixes in the replies. Common themes are backing plate ...
1998 Chevrolet Corvette 5.7L Steering VIN: 1G1YY22G6W
Well this vette is finally fixed, not to sure why I was having problems finding the fault code in the multi computer systems on this car but I was. Anyhow thanks to Robert,Stephen,Jason,Michael,and Bill for replying in favor of replacing the steering sensor I ...
1998 Chevrolet Cavalier Z24 2.4L No Start VIN: 3G1JF12T4W
As many of you suggested, due to the poor fuel pump repair, and the amount of time the car sat, the Injectors did need a good cleaning. After reassembly of the injector rail, the car fired right up and ran for about 3 minytes and stalled. It would restart imme...
1998 Chevrolet S10 LS 2.2L high idle VIN: 1GCCS1941W
All of the ten replies provided useful information and multiple ways to diagnose the problem. Worth reading. Ken [...] got me back to basics with the suggestion to block off the air intake and see if the engine kept running. It did and confirmed what the scan t... Trouble codes: 507B.
1999 Chevrolet Silverado 1500 4.8L No Start VIN: 2GCEK19V6X
this truck is gone for now, we put in another ecm with gm relay, rechecked all grounds, time will tell on this one, i don't know why this circuit went bad again. thanks for all the replies...joe
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDS13S02
I did install a new cam phase solenoid. One response said he had seen this sensor made the engine idle rough. If you do one make sure you add time for unmounting the p/s pump, the solenoid is long and won`t clear the pump. Trouble codes: P0014 (cam phase performance).
2003 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1432G935
first THANKS to everyone who emailed me with help. i fixed this vehicle by finding the valve for p/s exhaust pipe and replaced valve cleared code and drove for 2 cycles. thanks again Trouble codes: P0416.
2003 Chevrolet Silverado 2500 HD 6.6L Cooling Systems VIN: 1GCHK23103
Great News! This Duramax is running again. The truck had a bad injector as well as it was leaking coolant so we called the GM dealer we work with and they replaced all the injectors under warranty and installed all new sleeves at almost no cost to our customer...
2003 Chevrolet Avalanche 1500 North Face 5.3L four wheel drive VIN: 3GNEK13T53
I enjoyed reading all of your suggestions, turns out my original inspection and changing of fluid did the trick, just took a couple of days of the owner driving the vehicle for it to quiet back down. It will be interesting to see if this one develops into more...
2004 Chevrolet Express 3500 6.0L oil pressure VIN: 1GCHG35U84
hey guys thanks for the replies the customer decided to take the van to the dealer. i was notified by the customer a week later and he told me they replaced the cluster and it was fixed so i hope this information helps in the future.
2004 Chevrolet Suburban 1500 Z71 5.3L loss of monitors VIN: 1GNFK16Z54
Well I'm sorry to say I didn't get the chance to fix this truck. We got the monitors to run long enough to get it to pass nysi and then we lost the readiness again. At this time the client has decided to wait on fixing it. With everyones reply's and what I hav...
2004 Chevrolet Silverado 1500 4.8L will not run monitor VIN: 2GCEK19V04
Thanks to all who responded. Got some good info. I did check Tstat to make sure it was getting up to temp. We tried to update the computer with new software and that is when we realized where the problem was! The PCM would not allow us to go any farther with t...
2001 Oldsmobile Bravada 4.3L ebcm relay VIN: 1GHDT13W11
I came into this second hand, our other tech checked this out,at that time he could not duplicate the problem. I got the vehicle and it messed up for me, ended up being the EBCM. thanks for the replies.
1997 Pontiac Bonneville SE 3.8L Hesitation, Misfire, MIL Lamp on VIN: 1G2HZK7VH2
Well After countless hours and pulling all of my hair out. I checked just about every sensor and the ecm. The last sensor i checked was a map sensor...Go figure that fixed the car and it is running like a champ. Thanks for all your help and feedback! JOHN Trouble codes: P0171, P0300.
2003 Saturn Ion-1 2.2L No Start VIN: 1G8A152F73
we came up empty on diagnosing this car, we kept the car for 4 days it started every morning with the exception of a slight rough idle cold, we sent the car to saturn and did a reflash and a fuel filter, checked back with customer today and all is fine, rough ...
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