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Prev Professional Automotive Repair Technical Discussions for June 21, 2004
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Open Help Requests for GM
Help Request Answers
1989 Buick Skyhawk Custom 2.0L Hesitation, Cuts out, Misfire VIN: 1G4JS5111K
this vehicle came in the other day from another one of our shops. most things that i have mentioned for the related repair history was replaced there. when i first got the vehicle the idle was very irratic and stalled out. after doing an adjustment and resetti...
1994 Buick LeSabre Custom 3.8L no start VIN: 1G4HP52LOR
This vehicle came in for a no start. Starts and runs perfect sometimes and other times starts and runs about one second and then dies. When it dies it looses injector fire. Hooked up otc 4000E scanner, it has code #s 1626 Pass key failure and 1629 Pass key 11 ...
1997 Buick Park Avenue 3.8L temp & fuel gauge VIN: 1G4CW52K4V
Problem is in dash assy, the customer complains that while driving the temp gauge and fuel gauge goes all the way to the extreme end and the all the warning lights on dash come on and then go off, the car stills runs and starts. I tried cleaning the battery co...
1993 Cadillac Seville 4.6L Excessive Emissions
Problem is constant.While i bring this monster inside garage all staff disperse because of blue smog and full-flavoured gas. No codes, injector's pulses are OK - approx. 2.5 msec. Injectors aren't leaking.I didn't put gas analyzer inside tailpipe because i'm s...
1996 Cadillac DeVille 4.6L extended crank VIN: 1G6KD52Y1T
this car came in with a hard start after hot soak 1 hour. we checked fuel pressure, pressure droped to zero in 10 seconds. replaced fuel pump assembly. pressure now holds to spec. checked fuel pressure regulator for leaks and found none. replaced both crank se...
1988 Chevrolet C1500 Cheyenne 5.0L Hesitation, Surge VIN: IGCDC14H9J
The fellow that mows my yard brought his pick up truck over with a real bad hesitation from a dead stop. His buddy and himself changed the engine. It came from a 84 chev car so they had to change the intake. Actually looks like a pretty good job. I checked for...
1996 Chevrolet S10 2.2L volt meter VIN: 1GCCS1449T
Hello everybody hope you can help me with this one. Alternator originaly repllace 11-2003, had stopped charging,light on. shortly there after at speed on highway voltage would start to drop intermentently, engine starts missing ang signals slowed down. Pulled ...
1997 Chevrolet S10 2.2L fuel gauge VIN: 1GCCS1445V
Good evening Techs, Put a fuel pump assy in for a no start and the fuel gauge reads past full all the time. Was working good according to driver and it is a fleet vehicle and the driver is probally telling the truth.(just my luck)I plugged the old unit back up...
1997 Chevrolet Express 3500 5.7L 1-2 shift VIN: 1GCHG85R7V
Hello. Unit was recently purchased at a fleet sale with the understanding the transmission was bad. The owner took it to our local transmission man. During the test drive, it would shift from 1st to 2nd, then it would either start slipping or go into neutral. ...
1998 Chevrolet Venture 3.4L speedometer VIN: 1GNDXO3E4W
Eh Guys, maybe you have seen this before?! This '98 Venture van has a very irratic speedo/odometer. The cruise control drops out at the same time as well. The GM diagnostic flow chart had me checking for voltage at ECM, underhood junction block and rear of clu...
1998 Chevrolet Cavalier LS 2.4L Cuts out, Stall, THEFT SYSTEM VIN: 3G1JF52T4W
HELP. I went for a test drive with customer and when going down the road at any speed it just drops out and sometimes the theft light comes on. I thought it must be primary, wrong turns out it is turning the injectors off. I then pulled codes ipc had a Z21(sna... Trouble codes: P1629 (theft enabled), Z21 (loss of uart from pcm to ipc)
1998 Chevrolet Cavalier Z24 2.4L timing chain VIN: 1G1JF12T6W
The car came in for an antifreeze leak and a steering groan.The steering groan was low fluid-no leaks found.The antifreeze leak was the water pump dripping with out any pressure on it.We replaced the water pump with a new AIRTEX pump.When the timing cover was ...
2000 Chevrolet Impala 3.8L No Start, MIL Lamp on VIN: 2G1WF55KXY
Hello all, I have a 2000 Chevy Impala with a police package. The engine is turning over very slow with a new starter and all of the plugs pulled. In fact, we can smell the new starter burning up trying to turn the engine. We even tried another starter. Bad ca... Trouble codes: P0135 (O2 Heater CRT Bank 1 Sensor 1), P0141 (O2 Heater CRT Bank 1 Sensor 2)
2000 Chevrolet Malibu 3.1L Elec. cooling fans VIN: 1G1ND52J8Y
We have done everything! Am I just dummmmmmmmmmm! Cooling will not come on when car up to 223 or more. Fans will run when turned on from scanner or will come on with a/c on. Did flow chart from Mitchel and came to cooling fan relays, replaced all 3. More test...
2002 Chevrolet Malibu 3.1L door locks VIN: 1G1ND52J52
Any advise would be appericiated ! Customer states the Power door locks won't lock car anymore when placed in any gear selection. All locks & switches work OK with indivual switches I scanned system, no codes & the PRNDSL indicates proper gear selection ) ?? ...
1996 GMC Sonoma SL 2.2L Compressor VIN: 1GTC51443T
AC was not blowing cold, pressures were about as above. Suspected damaged orifice tube, replaced orifice tube and recharged system. Orifice tube was dry and dark gray in color, with a little debris caught in the screen. Still not blowing cold and high side is ...
2000 Oldsmobile Alero GLS 3.4L Unknown VIN: 1G3NF52E0Y
Popping noise when turning-you have to be moving-sounds like cracked frame-vary random and intermittent. Installed chassis ears and drove the vehicle until vehicle drove me crazy! Possibly the lower control arm-right. When popping noise happens it's quite pron...
2002 Oldsmobile Aurora 3.5L stability control VIN: 1G3GR64H22
Hi Oldsmobile tech. I need help on this one. The car came in 4 or 5 week ago ride stibility light on. After drving the car 2 or 3 mile Ride stibitity light come on. Ride stibitiy and ride hieght inop. Checked codes B1009. Replaced BCM, ride hieght started work...
1987 Pontiac Safari 5.0L Eating ingition modu VIN: 1G2BL81Y4H
What I'm looking for is the procedure too by pass the EST system,did alot in late 70 and thru 80 on chev GMC pickups but time has passed and so has the data in my mind. term. areA B C D . any help will be aprecciated.
1992 Pontiac Bonneville SE 3.8L compressor
High group, i have this 92 Bonneville SSE, the high side pressure does not rise above 100psi and the low side is in the specs. So the compressor is not cycling, there is no codes in the system and the AC works fine except of this problem, does someone has some...
1993 Pontiac Grand Am SE 2.3L No Start VIN: 1G2NE5430P
Car came in as a no start no spark. My tech checked car and wound up replacing ignition module and car started and ran fine. Test drove checks ok. returned car to cust and 3 days later car comes in on a hook and no start and no spark. Check for crank sensor re...
1999 Pontiac Grand Am SE 2.4L traction VIN: 1G2NE12E6X
Vehicle returned today for tcs light intermitantly comming on for a brief second or 2. was able to confirm by "check this out" stopped in the shop, vehicle NOT moving, running, in any gear, turning the steering wheel... tcs light will come on, then go out ??? ...
2002 Pontiac Firebird Formula 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on VIN: 2G2FV22G72
This is very broad and you may not be interested in trying. This car is his baby and I got a panic call will he was on a trip, I have not seen this car in my shop, SORRY! it runs fine until the check engine light comes on then it runs rough and is not responsi...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick LeSabre Limited 3.8L speedometer VIN: 1G4HR54C8L
After further testing we scoped the signal coming out of the ecm and no signal was present.We then checked thse signal coming to ecm that was good.We proceeded to get another ecm and the problem was corrected.
2000 Buick LeSabre Custom 3.8L retained acces.
I have not seen the car back yet so I can not add any sure fix solution to my problem yet , only that it might be fixed by checking the grounds in the left rear of the trunk . Thanks for all the ideas .
1991 Cadillac Eldorado 4.9L Wheel speed sensors VIN: 1G6EL13B4M
Could find no problems with wheel speed sensors or their circuits so I replaced the EBCM. After EBCM replaced all wheel speeds correct, cleared codes and drove vehicle problem no longer present. Thanks to all that submitted Ideas it is alwayse apreciated.
1986 Chevrolet Camaro Z28 Iroc-Z 5.0L Hesitation, Cuts out VIN: 1G1FP87HXG
A major improvement was made in the cold hesitation by decarbing the engine 6 or 7 times. We sent it to our carb supplier and they replaced the carb and fuel pump again. The vehicle now runs good exept for usually subtle but sometimes pronounce hesitation at a...
1988 Chevrolet C1500 Cheyenne 5.7L Cuts out, Stall, BUCKING SURGE VIN: 2GCDC19K7J
I am listing this as a no fix due to customer has not called to complain nor confirm repair. I have seen the truck going down the road several times since it was released. As I had stated in the post I felt that there was more then one problem. The EGR valve... Trouble codes: 45 (RICH EXHAUST memory has not reset).
1996 Chevrolet S10 LS 2.2L Poor Idle Quality VIN: 1GCCS194XT
the egr plate gasket had a breech in it and was leaking internally..thank you to all that responded to this help request Trouble codes: 0172 (fuel trim system rich).
2000 Chevrolet C-Series Kodiak C6H042 7.2L MIL Lamp on VIN: 1GBJ6H1C9Y
The CAT engine can only be accessed by a CAT DEALER) Some causes of a check engine lite is dirty oil, air filter,or a dirty fuel filter. I serviced the truck and these filters and it didn't stop the check engine lite although it takes longer before it comes on...
1990 Oldsmobile Delta 88 Royale 3.8L Hesitation, Cuts out VIN: 1G3HN54COL
well had 3 respoces to this one and finaly got the the car for a day after checking it for codes and looking over wiring well and it had power to the iac with keys out of ignition found ecm to be hot to touch and start car and tap on ecm would cause it to run ...
1997 Oldsmobile Aurora 4.0L Cooling Systems VIN: 1G3GR62C4V
As I said before this vehicle ended up having a blown head gasket probably caused from overheating and pulling the theads out of the block. I was not able to borrow a thread repair kit from the dealer and the kit was on back order from Kent-More. So we ordered...
1998 Pontiac Trans Sport Montana 3.4L Misfire VIN: 1GMDX06E7W
Thanks guys. We did a motorvac(mac)last wed.but stiil had #2 missfire counts. Alot of info was still injector related so we done a second vac this morning and the miss is gone Thanks again, Steve Trouble codes: P0300.
2000 Pontiac Grand Prix SE 3.8L p0716 VIN: 1G2WJ52K4Y
Hello everyone and thanks for the help on this one. The problem ended up being poor connections at the harness pass thru on the transmission. We installed a new internal trans harness and tweaked the mating terminals. All is well Thanks.. Ron
1999 Saturn SC2 1.9L Surge, Misfire VIN: 1G8ZR1274X
I received several replies and did verify that there was not any intake manifold leaks or that ther wasn't a head gasket leak. The customer hasn't returned, but I suspect the possibility of losing triggers to the ignition module from th crank sensor. When I ge... Trouble codes: P0562 (system voltage low), P1599 (engine stall or stal detected), P1602, 10W, C0001, C1RCU.
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