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Prev Professional Automotive Repair Technical Discussions for May 3, 2006
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Open Help Requests for GM
Help Request Answers
1995 Buick Park Avenue 3.8L Hesitation, lacks power VIN: 1G4CUS5219
Previously this car (and others like it) would lite up and smoke tires on concrete pavement from stop, very agressive acceleration, now it runs like a non-supercharged 3.8 with a flat spot-hesitation on inital acceleration. Will run 80 mph + just lacks previou... Trouble codes: P0321 (This code does not set MIL lamp - Lacks spark refrence)
1996 Cadillac DeVille 4.6L transmission VIN: 1G6KD52YXT
This car vehicle came in and the customer said it seems to slip out of gear going down the highway. the fluid is not burned and is full by the stick but when I went to scan it I can get no scan data for the transmission. I can connect to the engine just fine b...
1990 Chevrolet K1500 Cheyenne 5.7L Valves VIN: 2GCEK19KOL
Hi all I am at my witts end, This truck came in and had burnt valves, We recomended an eng Cust said eng didnt have that many miles on it so just do heads, Cust came back and 2000 miles later said it is pinging and no power.We checked every thing timming, bala...
1994 Chevrolet Corsica 3.1L Misfire VIN: 1G1LD55M1R
6 cylinder spark will come and go,note switch coil and ing mod. same thing,on 6 cylinder
1998 Chevrolet C3500 Cheyenne 7.4L Hesitation VIN: 1GBKP37J2W
Hey NEED help from all The GM techs This very large rv came in for a hesitation that only occurs when the vehicle is cold and occurs within the first five minutes of driving. We have had it for several days. The first attempt was to replace the fuel pump due t...
2001 Chevrolet Venture LS 3.4L Driver Information Center VIN: 1GNDX03E01
I am working on a 2001 Chevy Venture van. The Driver Information Center is not working. What it does is when I first turn the key to the on or start position, the display will show correct outside temperature, after about 5 seconds, the display goes blank & sh...
2003 GMC Sierra 3500 6.0L Poor Idle Quality, hard start VIN: 1GDJK34U63
Hello again everyone, I have this 2003 GMC Sierra 1 ton dually with a weird problem. The initial complaint was that he stopped at the light, went to leave and the truck would not rev up. There were no warning lights or any other previous indication of problem... Trouble codes: P0131 (o2 sensor b1s1), P0137 (o2 b1s2), P0151 (o2 b2s2), P0157 (o2 b2s2)
2000 Oldsmobile Bravada 4.3L drivetrain VIN: 1GHDT13W1Y
this vehicle vibrates or is binding on slow left turns only. no noise from front axle shafts or suspension. we've check for technical bulletins and other related issues on iatn and identifix still have no answers. any help would be gratefuel.
2003 Oldsmobile Alero GL 3.4L No Start VIN: 1G3NL52E83
This car has been an ongoing problem Intermittently won't start hot or cold. I finally got it to act up for a few seconds and was able to determine It lost spark. The car never cuts out on the road. I replaced the crank sensor located in the engine block din't...
1990 Pontiac Bonneville LE 3.8L MIL Lamp on VIN: 1G2HX54C6L
Hello domestic experts. This is my own Bonnie. It's been in the family since it was new and we have maintained it very well. I have a code 41 and an intermittant long crank/hard start. I've read the fix database and it seems that the consensus is replacing the... Trouble codes: 41 (cam sensor)
2002 Pontiac Grand Am SE 3.4L starter VIN: 1G2NF52E02
When the car was first towed in I scanned it with my Genesys and found no codes. When looking through the data I found that when the shift lever was in park the Genesys showed reverse. I checked the linkage and found no problem so off to the local dealer for a...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Cadillac Eldorado 4.6L Shifting/Dash VIN: 1G6EL12Y3R
Thanks to all whom responded to my post, your help was greatly appreciated. The fix was indeed another ECM.
1997 Cadillac DeVille d'Elegance 4.6L tcs & abs lights VIN: 1G6KE52YSV
Thanks to all who replied. After checking all related wiring circuts I reconnected the module and the lights went out and now I had TCM data and six codes. C1232,1233,1234,1235,1255 and 1298. I then cleared codes and test drove and all seems to be good. I gues...
1999 Cadillac Catera 3.0L Radio VIN: W06VR52R3X
i can't believe it. i must have skipped over the back of this fuse to fast. i didn't have power on this fuse at all yesterday, or so i thought. i sharpened my 8 year old test light to do some probing yesterday, and today, i recieved 1 response from steve - THA...
1974 Chevrolet G30 Van 5.7L 3-2 shift VIN: CGY3343106
Thanks Sherman. Sure enough the governor was worn to about .792, so I got a new one and it's workin' great. Thanks again for the quick help!
1993 Chevrolet Pickup K3500 6.5L speed sensor
i found then the speed wheel in the tranny had been left out removed tranny installed wheel all worked great thank you all for the help
1994 Chevrolet G30 Sportvan 7.4L backfire VIN: 1GAHG39N1R
Thanks for all the replies. Most were correct, there were a couple of weak valve springs allowing the valves to hang open. Replaced all of the springs and all is well.
1995 Chevrolet Lumina 3.1L Pass Key VIN: 2G1WL52M3S
The customer decided to not return the vehicle and live with the intermittent no start. Go figure! Thanks for the help in spite of not being able to fix it.
1997 Chevrolet Blazer 4.3L alternator VIN: 1GNDT13W5V
we replaced 4x4 switch and instrument cluster and found no other problems, have not seen or heard from customer for a couple of weeks now. thanks for all the help.
1999 Chevrolet K2500 Suburban 7.4L Encoder Motor VIN: 1GNGK26J5X
Thanks for the replies. My suspicion was that there may be a pattern failure with parts manufacturing on this design, but no responses confirmed that. Currently the vehicle is working properly, so my customer has elected to leave it alone for now. If I have an...
1999 Chevrolet K1500 Suburban 5.7L lack of power VIN: 3GNFK16RXG
thanks for all the help on this one guys. the airflow meter was the problem. i still dont understand why the injector pulse was so high and it was still running lean, but either way the airflow meter now comes up over 100 grams a second and the o2s are not sho... Trouble codes: P0131, P0137, P0151, P0157.
1999 GMC Sierra 1500 SL 5.3L heat controls VIN: 2GTEK19T3X
Hello all, I am putting this as a fix for now. Sorry for the delay in posting but I am waiting for the customer to return. I have a feeling he either went to the General or is not worrying about it. Thanks to those who replied. I had suggestions of wrong par...
1991 Oldsmobile Cutlass Ciera S 3.3L No Start VIN: 1G3AJ54N2M
Thanks to all for assistance in identifying signal to ECM to verify malfunction, open circuit in bulkhead connector. thus no signal to ECM.
2001 Oldsmobile Alero GX 2.4L anti theft system VIN: 1G3NK12T01
From all of the replies I received, the general consenses was to replace the ignition switch assembly. I have done this and the vehicle has not had any problems to date. I hope this is the last of it. All the testing I have done has not shown me any defective ...
1978 Pontiac Firebird Trans Am 6.6L evap. and heater core VIN: 2W87Z8N111
The suggestion to first remove the evaporator, then remove and install the heater core, finishing up by installing evaporator box was the best option.
1997 Pontiac Trans Sport 3.4L Surge VIN: 1GMDX06E0V
Thanks to those who replied. Most of the responses suggested further testing of the fuel pump, I already thoroughly pressure and flow tested fuel system. One suggested a possible MAF problem, and possible bad alternator diodes. The fix was actually the cranksh... Trouble codes: P0706.
2000 Pontiac Firebird Formula 5.7L ride height VIN: 2G2FV22G2Y
have followed up on all suggestions. while the vehicle has no accident history (per customer history and car fax ), we still can find no chassis or suspension reason for body height to be off. local GM dealership is going to put on their frame rack and check a...
2003 Pontiac Grand Am SE 2.2L pump VIN: 1G2NE52F33
All the replies I received were appreciated, but not the answer. I found the answer as a last draw. We put 1 oz of Ford diff additive in the fluid and the noise immediately went away. All I can sum up is that the fluid was pulsing so bad that I was hearing a k...
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