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Prev Professional Automotive Repair Technical Discussions for October 11, 2004
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Open Help Requests for GM
Help Request Answers
1995 Buick Riviera 3.8L Harsh Cold Engagement VIN: IG4GD2217S
Let me begin by stating that I am not a transmission specialist; our shop generally performs routine maintenance, leak repairs, and electronic sensor/ solenoid repairs only. We have never come across this particular problem before; pretty much what we hope to ...
1972 Chevrolet K10 5.7L Lacks power
Hey guys I need some help with this one and it seems so simple but I cant get it. I put a new gm crate motor, 290 hp part #[...] that the gm perfo...
1984 Chevrolet Corvette 5.7L overdrive VIN: IGIAY07877
Hello everybody, I have a customer who has a strange problem with the overdrive operation. intermittantly it jumps out of overdrive and then comes back in on its own. exactly the same feel as if the switch was turned on and off. we can not simulate the fault ...
1992 Chevrolet C3500 Cheyenne 7.4L popping in intake VIN: 1GBJC34N9N
Truck runs great other than popping in intake.
1995 Chevrolet Lumina 3.1L shift cable or steering colum VIN: 2G1WN52M45
I would just like to know if the cable goes bad or just needs lubrecated this is a common problem on luminas, and if anyone has experienced this before? is their a TSB, recall or an improved cable available? thanks, John
2000 Chevrolet Astro 4.3L Drivers power window VIN: 1GNEL19W1Y
Hi techs, wondering if anyone has run into this. Drivers window will sometimes stop in either up or down direction as if a circut breaker pops. After what seems like a cooling down period window will work again. All other windows work fine even when drivers do...
2001 Chevrolet Impala 3.8L Misfire, no power spark knock VIN: 2G1WF55K01
When it starts this problem is at part throttle in 3rd gear [...] 48mph Maf 85.31g/s TP 1.78v Load 73% Map 4.13v O2 .56 spark adv.-1 knock retard 14 Also will drop #6 clyinder I have switched plugs and coil with no effect. Ran a injector flow test 52psi to ...
2002 Chevrolet Silverado 3500 8.1L intermitant p0743 VIN: 1GCJC33G82
this belongs to a friend. called one sunday from about a 100 miles from shop. owner had no reverse. claims she never saw a check engine light. i told her to turn off the truck and restart it. problem was cured. next day i retrieved p0743 from trans with tech 2...
2003 Chevrolet Tahoe LS 4.8L MIL Lamp on VIN: 1GNEC13V23
I have this tahoe setting a code p1516 ELEC THROTTLE VS THROTTLE POS and REDUCED POWER MODE. The pcm has been up dated I have replaced the [tp]throttle position sensor,[app] accelerator pedal position,and the[tac] throttle actuator control. The code still sets... Trouble codes: P1516 (Elec. throttle mod. vs throttle pos.)
1996 Geo Metro LSi 1.3L bucking VIN: 2C1MR5294T
Just moved to an independent after years as a line tech. I agreed to swap trans as vehicle was hanging in bay. Engine was swapped by another tech several hundred miles ago and ran OK. Vehicle returned to me with cracked flexplate, customer supplied transmissio... Trouble codes: P0505 (Isc)
1994 Oldsmobile 98 Regency 3.8L Poor Idle Quality VIN: 1G3CX5K8S4
it seems to idle fast at times, the icounts is usely above 70, but when you shout the car off and restart it right away it goes down to 36 icounts and idles ok about 800 rpms any ideas.
2000 Oldsmobile Intrigue GLS 3.5L Steering Angle Sensor VIN: 1G3WX52H9Y
This car arrived with the service vehicle soon, PCS, and Trac Off lamps illuminated. Checked for codes with Tech 2 and found the current code C0710 steering angle signal. Tried to clear code but it comes back immediately. Power and ground at the sensor are ok....
2000 Oldsmobile Alero GL 2.4L Misfire VIN: 1GNL12TXYC
Previously came into shop after having been elsewhere with randomisfire on cyl 1 & 4. Shop previously had replaced coils with no sucess. We tried coils and shell with new insulators and miss still present. Took advice from previous post chec oil pressure and a...
2003 Oldsmobile Alero GL 2.2L rotors and pads VIN: 1G3NL52F43
Vehicle has been driven aprox 3000 miles since front brake rotors were turned and pads replaced and rotors are starting to warp again (slight rotor runout vibration felt on road test during braking) Customer showed me the old pads, the inboard pads were worn ...
1995 Pontiac Grand Am SE 2.3L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G2NE55D3S
Hello Techs I have a 1995 pontiac grand am that starts fine and idles fine until it goes into closed loop then the fuel trim will start to drop from about 125 to 35 the car will stumble then go back into open loop for a few seconds idle will pick up until clos...
1996 Pontiac Sunfire GT 2.4L Cooling Systems VIN: 1G2JD12T9T
Hallo fello technitians.The temp gage on this car varies from 1/2 to 3/4 on hot days in a traffic but never goes to red. I have changed the thermostat, coolant, and the temp sensor on the scaner reads exactly what the gage is showing. The fan comes on but seem...
2001 Pontiac Sunfire SE 2.4L ses light on VIN: 1G2JD12T7Y
Hi to all! And thanks in advance for any and all help. I have a 2001 Pontiac Sunfire 2.4l. SES light on codes P0622, P0621 Generator "F" and "L" control circuit problem respectivly. Cust came in with SES light on and "BATT light coming on intermittantly. (just...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Cadillac Eldorado 4.9L Misfire VIN: 1G6EL1ZB9P
thanks for all your replies, I recieved suggestion of injectors to head gasket but the one that was right was Ronald in wisconsin. lets here it for ronald!!!
1994 Cadillac DeVille Concours 4.6L Poor Idle Quality, Cuts out, Stall VIN: 1G6KF52YHR
Thanks to all who replied, Replaced the pcm and everything is ok right now. I kind of had the feeling it was going to be the pcm, but with the trans just being replaced a few hundred miles ago I did not want to just throw the pcm in. All of the grounds were go... Trouble codes: 41 (no cam ref signal), 47 (bcm to pcm serial data problem), 52 (def pcm ecu ram chip error), 95 (eng stalled), 109 (int. ecm problem), 107 (bcm to pcm serial data problem).
1988 Chevrolet G30 Hi-Cube 5.7L Cuts out, Stall VIN: 2GCHG31K0J
Hello, I want to thank you all the techs. out there for the advised, the problem was the pick up coil, replace used one from the local used parts. thanks again.
1991 Chevrolet S10 4.3L Poor Idle Quality VIN: 1GUKCT18ZM
Thanks to all the replies. There was a very unique fix to this one. After checking the ECT sensor multiple times and finding a cracked magnet in the distributor the problem was still there. While blowing smoke through the vacuum lines we found the line from th...
1997 Geo Metro 1.0L MIL Lamp on VIN: 2C1MR2269V
Well, This one almost fooled me, yet it didn't. The computer was the fault, but Don't let this one fool you like it did me. The computer is programmed to NOT ground the Rear O2 sensor (only the rear) until the car has been driven in 4th or 5th gear for a few m... Trouble codes: P0136 (O2 Sensor Fault Bank 1 Sensor 2).
1991 GMC Safari SLE 4.3L idle climbs in gear VIN: 1GKDM19B3M
the new autozone iac that some other shop installed had a mind of it's own - replaced with a new delco unit, works fine now. no vac. leaks or trans convertor problems
1996 Oldsmobile Cutlass Supreme 3.1L Poor Idle Quality, MIL Lamp on VIN: 1G3WH12M5T
Thanks to all the techs who offered help. Most recommended the injectors and I also came to this conclusion. Unfortunatly, the customer did not want to invest that kind of money in the car so I guess I will never know if injectors would have repaired it. It ... Trouble codes: P0300.
1997 Pontiac Grand Am SE 2.4L Engine VIN: 1G2NE52T0V
Sorry for the lack of updates. Between the computer problems I had and the lack of problems with the car (probably restart tomorrow) I just forgot to fill out the close form. Lots of good ideas but the biggest problem with the car was it never had a no start p...
2002 Pontiac Grand Prix SE 3.1L Hesitation, Surge VIN: 1G2WK52J31
Thanks for all feedback. We cleaned all grounds and power supplies and problem has been gone now for two weeks. We are hopefull that we will not see this one back in. At this time, we are convinced that the problem has been corrected by cleaning weak grounds. ...
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