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Prev Professional Automotive Repair Technical Discussions for December 15, 2005
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Open Help Requests for GM
Help Request Answers
1990 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP54C3L
This car has been brought to us by another shop that has done all that work. They got it from the owner who had tried to replace the balancer himself and had damaged the crank sensor. I don't know what other work or attempted work has been done. This car is in...
2002 Buick Century Custom 3.1L abs VIN: 2G4WS52J62
scan with mastertech...c1225 excessive wheel speed variation, Left front. no play in bearing, wire is not touching anywhere. data stream never shows zero, rather the numbers blur for a very short duration. on occasion this will happen at highway speeds going s...
1997 Cadillac DeVille 4.6L Cuts out, Stall VIN: 1G6KD52Y9V
this vehicle has really been a pain,no codes found and problem does not happen with any regularity.dies only on decel and only after 30 min. or more of driving time,engine will restart no problem, vehicle runs normal rest of time
1989 Chevrolet C1500 Cheyenne 5.7L door locks VIN: 2GCEC19K3K
This truck is making me feel like an idiot! The power locks are inoperative all of the time. Looking at the diagram(assuming alldata has the right one?) it's not that complicated of a system. It appears that there is no relay in the power side of the circut. I...
1991 Chevrolet Lumina Euro 3.1L Cuts out VIN: 2G1WN54T3M
This is one that can keep me humble. when it's cold, it has a stumble just off idle and it is also apparent at a medium to hard acceleration. when it warms up, it runs well. we tried a new prom from gm and it made things worse. we put the old prom back in and ...
1995 Chevrolet K1500 5.7L Poor Idle Quality, Cuts out, Stall VIN: 2GTETK19K9
thanks in advance to any help that we receive this has been a headache all week for us, truck comes in and when it is left outside and drops under 0 degrees celcius wont stay running when in open loop. wont idle at all. once it warms up it runs like a charm, ...
1995 Chevrolet Corvette 5.7L shocks VIN: 1G1YY23PXN
hello all, customer wants to replace factory shocks with aftermarket, and do away with the electronics, i know on some of the cadillacs there was a relay kit to keep the light off, was wondering if someone new of something for this to keep the asr light off, t...
1996 Chevrolet Tahoe LS 5.7L Drive Line VIN: 1GNEK13R2T
Customer complaint of growl noise from under vehicle after a loud pop noise. Checked rear end and found broken center shaft, posi governor+pins, shaft bolt fell out causeing above problems, replaced all parts and fluid, and additive, test drive, still has grow...
1998 Chevrolet Blazer 4.3L transfer cas VIN: 1GNCT18WXW
this unit will not engage into 4 hi it will go into 4low when the switch is engaged you can hear relays working and i checked for bad grounds & for voltage and all wiring to motor all ok the 4hi and 4 low lights blink 5 times when pressed then some times both ...
1998 Chevrolet K2500 Cheyenne 5.7L clunk VIN: 1GCGK24R2W
I have a 1998 K2500 that has a horrible clunk intermittently. It only does it once per drive cycle, and so far has only done on or near the 2-3 shift. Also the trans has to be cold. After a few starts from a stop, it sounds like a quick ratchet and a clunk you...
1999 Chevrolet K1500 Suburban 5.7L noise VIN: 1GNFK16R3X
thank you in advance this is my better halfs grocery getter.she has been noticing a loud pop when shifting to reverse or drive. i heard it and it is more of a clang/pop and sounds external in transmission area. it does have 4L60E and i know we are on barrowed...
1999 Chevrolet Blazer 4.3L head lights VIN: 1GNCS13WXX
was told there 2 relays found 1 in fuse box under hood its good
2003 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J13
car came in about 4 months ago with a no start.after checking found bad crank sensor. drove approx 4500 miles and would not start after overnight.check all normal things and we are not getting injector fire but we do have plug fire.we have checked cam and cran...
1993 GMC C1500 Sierra SLE 4.3L Surge VIN: 1GTDC14ZXP
you can call this one surge at steddy speed . the truck have a good idle but when i test drive at 90-100 kmh speed start to drop no throttle response, start to buck and hesitate unless i go to full throtle only then the power come back. Fuel pressure remain go...
1995 GMC w4 5.7L Excessive Emissions, Poor Idle Quality VIN: 4KDB4B1A3S
Hello and thanx for your time. This truck ran very poorly and had multiple codes and problems. I made repairs (related repair history,with the exception of fuel pres. reg.) and truck runs relatively well (no dead cyls.) but the emissions are through the roof. ...
2001 GMC Savana 2500 4.3L belt/ tensioner VIN: 1GTFG25W41
Odd problem here van had a belt noise,.belt was replaced,.shortly thereafter the belt just kinda grenaded,.replced with GM belt,...a few hours later same thing,. now i get the van found bad idler and alt. replace those as well as tensioner and a new GM belt. A...
2002 GMC Savana 1500 5.7L Misfire, MIL Lamp on VIN: 1GTFG15R32
van came in on the hook customer reports having it at a shop and they replaced the plugs-wires-cap-rotorand fuel filter van ran good on his way home it stalled and would not restart so it was towed in to me i removed the o2 sensors and the van started so we so... Trouble codes: P0300
2000 Hummer H1 6.5L slips out of overdrive VIN: 137ZA8432Y
car has chech engine lite on(unable to read any codes) after 4-5 miles falls out of overdrive, tach drops to idle off throttle but holds 3rd gEAR on throttle. weve tried three differnet scan tools and cannot access any codes!! any ideas would be appreciated.
1989 Oldsmobile Delta 88 Royale 3.8L No Start VIN: 1G3HN54C1K
Original concern vehicle came in for was lack of power & hard to start. Had been to 2 other shops-no luck. test fuel pressure-was at 25 psi. replaced fuel pump & filter-test pressure. at 45 psi, test drove-ggod power. released vehicle to customer. came back in...
2002 Oldsmobile Bravada 4.2L Misfire, MIL Lamp on VIN: 1GHDT13S72
replaced #5 injector suspected bad spray pattern misfire gone. vehicle back the next day' misfire #5 stillhave good spark still have good inj. pattern/signalper Vantage. Cam and crank looked good out of ideas! Trouble codes: P0305
1995 Pontiac Firebird 3.4L valve adjustment VIN: 2G2FS25S22
alldata says to put #1 cylinder to firing position and adjust 1,2,3, exhaust and 1,5,6 intake then put the motor on #6 firing position to adjust the rest. there is supposed to be a arrow on the front timing cover but for the life of me i can't find the arrow. ...
1996 Pontiac Grand Am SE 3.1L starts and dies VIN: 1G2NE52M7T
hey everyone this car sat four about 8 months and we just installed long block now the car just starts and dies I installed a new key cylinder and tryed a used dash cluster but light still flashes i also cycled key 10 times trying to reset and let sit for 10 m...
2001 Pontiac Aztek 3.4L No Start VIN: 3G7DAO3E41
Thanks in advance to the gm doctors out there.The Aztez was towed in for a no start no crank condition.Odometer is lit up with error instead of digits.There is no communication with the pcm & there is no mil light during the bulb check.Checked inputs & outputs...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Buick LeSabre Custom 3.8L No Start, Stall VIN: 1G4HP54C4J
This beast is fixed and I am a happy camper! (bg) I would like to thank all 15 techs that responded to my post. In summary, it was recommended that I check the coils. I did and they produce 40KV with no problem. One person mentioned the ICM. I knew my ICM was ...
1992 Cadillac DeVille 4.9L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Poor Fuel Economy VIN: 1G6CD53B4N
this one turned out to be three problems. poor mpg was a bad 02 sensor that we didn't check out good enough and the poor idle and other related problems were blocked tubes under the throttle body. the main problem was that it stalled bucked and jerked after ab...
2003 Cadillac Escalade ESV 6.0L ebcm,lateral sensor codes VIN: 3GYFK66N73
thanks guys for all of your suggestions. the vehicles computer needed to be reflashed and that took care of all the problems... sincerly john blaine comunity car care
1985 Chevrolet Celebrity 2.8L Surge, Stall, MIL Lamp on VIN: 2G1AW19X7F
sorry all. forgot to close this post. I did fix vehicle. It was ditributor. installed new complete dist. from carquest - came with module and pickup. all set now. thanks
1997 Chevrolet Monte Carlo Z34 3.4L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 2GN4W57XWV
replaced oxygen sensors and fuel trims went back to normal, drivabillity concern went away thanks to all that replied you were a great help Trouble codes: P0300 (Random cyl. misfire).
2000 Chevrolet Prizm 1.8L engine
Well thanks for all the replies. I was going the wrong way on this one, just assumed something had gone wrong with the timing. Turns out the locator pin on the head for the intake didn't line up, causing a huge vacuum leak. Reinstalled intake and vehicle ran f...
2002 Chevrolet Trailblazer LS 4.2L fan clutch VIN: 1GNDT13S72
Got 14 replies, 13 said replace the clutch, while Kevin #14 said the fan should spin free at the end of my test...thank you for answering my question Kevin...everyone was right...a new fan clutch fixed the truck.
1995 GMC K2500 Sierra SL 5.0L Clutch VIN: 2GTFK29H0S
This truck is on the back burner for now. I ended up dislocating my knee and wont have time to get back to it right away. Thanks to all who replied with advice and sympathy. The general consensus seems to be that there is something wrong with the new clutch ki...
1969 Pontiac FIREBIRD 400CID generator light
Well, I have to say that was the most responses I have ever received. Thanks a bunch. It became apparent after reading multiple posts that I was making it more complicated than it needed to be. Here's my summary: First, I didn't make it clear on the conversi...
1993 Pontiac Trans Sport 3.8L MIL Lamp on, A/C malfunction VIN: 1GMDU06L4P
In addition to the areas I covered in the update, I tried 2 Snap-On scanners and different years as William suggested but still doing it.. but still sounds like the best explanation. The intake temp code hasn't returned so maybe a fix there...? I can't say for... Trouble codes: 25 (MAT too high), 65 (cruise control servo position sensor), 66 (A/C pressure), 69 (high pressure switch circuit), 88 (PCM reset), 99 (power management problem).
1999 Pontiac Grand Am GT 3.4L MIL Lamp on VIN: 1G2NW52E4X
This was repaired by flashing.I had three replies that were 1.try another scanner..2 a short in the ecm.. 3 check the right lamp. i did appreciate the help but i was alone this time .This is a great tool thank you
1998 Saturn SC2 1.9L MIL Lamp on VIN: 1G8ZH1278W
thank you for all the replies. we followed the majority of the advise and replaced both sensors and the cts harness. the ses light did return while we were driving it with our test equipment on board and we diagnosed a failure in the pcm.we replaced the pcm an... Trouble codes: P0711, 90117 (engine temp).
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