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Prev Professional Automotive Repair Technical Discussions for November 12, 2008
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Open Help Requests for GM
Help Request Answers
1998 Buick Park Avenue 3.8L warning lights VIN: 1G4CW52K7W
Intermittently all of the instrument cluster warning lights (ABS, CEL, TRAC OFF, BRAKE, VOLT, OIL etc) will come on while driving-like a bulb check. The customer states that the gauges are uneffected. I have an IPC code of B1652- loss of KAM power. The HVAC mo...
1998 Buick LeSabre Custom 3.8L antitheft VIN: 1G4HP52K5W
this vehicle starts runs for a few seconds then dies .it has two re ocurring codes 1626 and 1629 vts crank signal .check resistance to key tumbler through the wires reads same as the pellet on the key.It it disabling the injectors also has code 1573 any help i...
1998 Cadillac DeVille Concours 4.6L Battery Draw VIN: 1G6KF5497W
Older widow woman with out much money, he pastor told her to bring it to the school to fix. If you unhook the BCM the parasitic draw drops to normal. BCM has been replaced at the GM dealer. Several of these in the fix data base, and the ones that were fixed po...
1965 Chevrolet impala 350CID Stall VIN: 166375D131
ok fellow tech and gurrus,thank you for your help,I have a customer's 65 impala 350 with a little more than mid cam in it. we reomved the holley carb do to not idling and installed an eldbrock.choke is working great and the car runs great,except when the motor...
1986 Chevrolet Corvette 5.7L clutch master/slave cylinder VIN: 1G1YY0785G
been having a problem with this c4 corvette. if you push the clutch pedal slowly, the pedal goes to the floor without restance, and the clutch master cylinder fills up. push the pedal normally, and it works properly. replaced clutch master cylinder twice with ...
1992 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCDC14K3N
help!!!this p/u came in(barely)under its own power,but with considerable surge & some popping back through the tb.took the ign. mod.down to oriellys & tested very bad.replaced w/bwd. mod. no this point ecm.set cts code.checked connector.& wiring, fou...
1997 Chevrolet Express 3500 5.7L Hesitation, Cuts out, Stall, Misfire VIN: 1GDHG31K8S
eng. has a intermittant miss and seems to lose all fire to plugs when this happens . i have no codes .hooked a timing light to eng. and drove van ,when eng. started cutting out i lost signal to the timing light i'm thinking that the pickup coil in the dist. is...
1998 Chevrolet Astro 4.3L Hesitation, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNEL19W1W
Under light accel about 20-30kph engine will hesitate almost always. This problem seems to be at a particular throttle position. For this reason we have chaged both TPS and MAF, with no change. Fuel pressure is at 53@ idle and 58@ snap throttle. I have not exp... Trouble codes: P0300 (Random misfire detected)
2001 Chevrolet Monte Carlo SS 3.8L 3rd & 4th VIN: 2G1WX15K91
After engine and transmission are at operating temperature and driving about 15 miles at non stop freeway speeds transmission slips in 3rd & 4th. When I cone to a complete stop it shifts normal and does not slip in 3rd or 4th, until I travel about 5 miles non ...
2002 Chevrolet Venture LS 3.4L Hesitation, Cuts out VIN: 1GNDX03E52
The van will run flawless and idle and at cruise speed. No miss or erratic idle. If you take off fast at a stop or brake torque the van you will get 2 or 3 pops (backfire) in the airbox and the van will die. I also hear 2 or 3 spark knocks when this occurs. It...
2004 Chevrolet Malibu LT 3.5L transmission leaking VIN: 1G1ZU54894
Hello all, I am having a problem with this car, we serviced the transmission a couple of months ago, it came back a couple of weeks ago with a leak. We replace the (reuable pan gasket), it came back the next day with the same leak so we took it off again and c...
2004 Chevrolet Silverado 2500 HD 6.6L Excessive Emissions, WON'T TOP 20 MPH VIN: 1G13HC2418
Vin #[...] mfg. 11/03 milage is 39,209. Here is the basic run-down: was told by owner, company work truck shut down on highway. Truck runs on high-grade biodiesel. Company employees driving truck assumed the filter had gotten clogged and replaced fi...
2005 Chevrolet Tahoe LS 5.3L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNEK13T35
This problem has started since the costumer pumped E85, but had burned through two tank fulls of regular gas since then. Changed the coil, wire , plug, and the injector. Re flashed the pcm. 150PSI of cylinder pressure ( 1 ) Smoked it for leaks ( Found NONE) F... Trouble codes: P0301, N0, C00DE
2007 Chevrolet Silverado 3500 Classic LS 6.6L cruise control VIN: 1GBHKK3464
Hello IATN technicians, this post is for GM truck techs. Can you field install a genuine GM cruise control(fast idle control)on this model truck. I do not want to use an aftermarkret kit on this truck due the fact that the genuine GM will give me stationary hi...
1991 Pontiac Firebird Trans Am 5.0L computer prom VIN: 1G2FW23F3M
hi out there,i am looking for a computer prom oe#[...],i can't find it any where,if anybody tell me where i can find one please let me know.thanks
2001 Pontiac Sunfire SE 2.2L dash guages
This car intermittently drops the guages,speedometer & tachometer to "o". If the h/lites are on they also significantly dim down. I cannot duplicate in the shop & the condition doesn't last but at the most so far about 30 seconds. Wiring diagram shows all the ...
2001 Pontiac Grand Am SE 3.4L MIL Lamp on VIN: 1GNF52E14M
Car has been fine for a couple weeks, and it's back agaim with the P0442. On day two of pulling out my hair on this one. This trip in No leaks are being seen, Already did the Fuel Pump O ring, but even before tested the tank for leaks. Same after the new O rin... Trouble codes: P0442 (EVAP Leak small)
2003 Pontiac Vibe 1.8L MIL Lamp on VIN: 5Y2SL62873
i have been fighting this vibe for a year now replaced cat and o2 sensors same code had aftermarket cat and then a oem cat still a couple months later p0420 code returns no service bullintens on programming issues any ideas would be helpful Trouble codes: P0420 (three way cat effiecently)

Fixes & Summaries for GM
Fix/Summary Answers
1994 Cadillac Seville SLS 4.6L cooling system VIN: 1G6KS52Y6R
Sorry for late response Blead system and that helped even out temp at idle, test drove at high way speed and noticed after a few minutes of driving started to push coolant out cap, after engine is fully warm and has been driven noticed the exhaust steam coming...
2007 Cadillac DTS 4.6L Stall VIN: 1G6KD57997
first i want to thanks the who replay Paul took the time and send me some tsbs we did fine some wires rubbing behind the rear seat we took care of that and we also clean the throttle body lots of carbon build this lady drive short trips and i think the egr val...
1984 Chevrolet Corvette 5.7L gearbox VIN: 2345678900
Thanks folks for all the input on this retro. I have decided to stay with the Doug nash for now as i dont really want to get too tied up with this conversion. I have learned a lot as far as whats involved.
1998 Chevrolet K2500 Cheyenne 5.7L Unknown VIN: 1GTGK24R4W
First I want to thank all of you who replied, we replaced the PRNDL switch and still had the same problem. We read all the postings again and Darryl from NC said there was a bulliten for a reflash, she we did alittle research and found it. We took the truck to...
1998 Chevrolet K1500 Cheyenne 5.7L module VIN: 1GCEK14R7W
Customer has not yet returned. I have spoke with him but am waiting for him to get time off work? I think Alex may have nailed this one. I rember a truck when i worked at the dealer. One of the other guys installed a new GM motor and the brake lights would not...
2001 Chevrolet Silverado 1500 5.3L Misfire, MIL Lamp on VIN: 2GCEC19T5M
Gentlemen - thanks for all the responses I had to this help request. The fix for code P0300 was an upper intake/injector cleaning (we stock Mighty's FUSION FSC) in combination with a good throttle plate cleaning, which we do manually with a toothbrush and int... Trouble codes: P0300 (random misfire), P0753 (shift 1/2 solenoid).
2005 Chevrolet Malibu LS 3.5L MIL Lamp on VIN: 1G1ZT54875
I called the customer today, and the light has yet to return.So until it acts up and sets a code, we are not going to be able to prove exactly what is causing the problem.To Chester; thanks for the reply,We are still looking for a good way to reset the mininum... Trouble codes: P0404 (EGR position sensor error), P0405 (EGR position sensor low).
2007 Chevrolet Aveo LS 1.6L Poor Idle Quality, Misfire VIN: KL1TD66647
Hey all, well this car in general has had problems with their valves not sealing properly which is why the car would be fine sometimes and misfire at other times. There was a tsb and the car was still under warranty so we gave the customer the tsb and sent him... Trouble codes: 300 (multiple random misfire).
1995 GMC K2500 Sierra SL 6.5L excessive diesel smo VIN: 1GTGK29F4S
turned out to be a bad computer owner had swapped his 94 computer to this95 there different so correct computer fixed problem thanks all for help i will continue to assist in future fixes as i can help
1999 GMC Yukon Denali SLE 5.7L blogs down VIN: 1GKEK13RZX
good morning everyone, i want to says thanks for all the help. i t turn out to be the fuel pump that was installed in jan of this year ( not by me ). it was a airtex fuel pump. i put in a delphi fuel pump what a diffence in power....
2002 GMC Envoy SLE 4.2L air bags VIN: 1GKDS13S32
2003 GMC Safari 4.3L Lighting VIN: 1GDDM19X23
I finally figured it out . basically it was a conversion van mastery which I should have figured . I went over everything I checked so far and figured out even if I removed the interior ground relay the lights would stay on it was like there was another switch...
2002 Pontiac Montana 3.4L abs/tcs module VIN: 1GMDX03E82
after several attempts to fix this vehicle and using the info supplied from you guys, i was ready to give up and send it to the dealer. then i figured i would try a new wheel bearing from the dealer just for peace of mind, and it fixed it. i was shocked, seein...
2004 Saturn Vue Red Line 3.5L Alternator VIN: 5GZCZ634X4
Well, it's fixed! All the aftermarket alternators had the wrong voltage regulators installed in them. I verified this by taking a test light from battery positive and touching one of the other unused pins in the connector at the regulator. This allowed the ...
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