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Prev Professional Automotive Repair Technical Discussions for September 26, 2006
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1983 Buick Skylark Custom 2.8L Poor Idle Quality, MIL Lamp on VIN: 1G4AC69X5E
Hi everyone, Working on one that has me stumped. The car came in running with mil on, when attaching scanner it had no communication. I checked ecm power & grounds, both were good. I then ordered & installed reman ecm (not delco as we prefer). Turned on ignit...
1990 Buick Regal Limited 3.8L MIL Lamp on VIN: 2G4WD14L9L
This unit came in with a MIL on and a code 42. Did all the tests and found the ignition module was at fault. Replaced the module with a Wells unit twice and then with a Sorenson unit once. The problem now is that the MIL will light on start up with a code 42, ... Trouble codes: 42 (est)
1997 Buick Park Avenue Ultra 3.8L Stall VIN: 1G4CU5218V
checked car from top to bottom, cannot find anything that would make this car stall, the only thing I have found is the car has 2 bad engine mounts, Don't really know if this is relevant or not. Any help at all would be greatly appreciated...
2001 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y51
I'm a little confused here all we did was to remove the dash to install a new evaporator core. All of that went well, everything works on the car, but these codes keep popping up. We have a Solus scanner and we're unable to relearn the crank position sensor an... Trouble codes: B1001 (Option configuration error), P1336 (CKP system variation not learned)
1991 Chevrolet Camaro RS 3.1L starting VIN: 1G1FP23T1M
I have a 91 3.1 chevy camaro, when starting, it bucks the starter severly like the timing is way over advanced, I have checked the timing, the damper ring has not sliped, it has a new starter and cap and rotor, tryed module, timing chain is good, I can get it ...
1991 Chevrolet Camaro Z28 5.0L No Start VIN: 1G1FP23F4M
hello - vats help needed. car came in with hard/no start. check fuel, spark etc. found the injectors were not firing. 12volt to supply wire & control wire to computer also had 12v. after feeding the purple/white wire at the ignition control module with a test ...
1994 Chevrolet C1500 5.7L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, When started, dies VIN: 1GCEC14K7R
This is killing us! The vehicle was towed in. When cranking the engine it will start but immediately dies. If the gas pedal is pumped aggressively, the engine will stay running but with a very bad miss, but will eventially die. My guys have slaved in the follo...
1996 Chevrolet K1500 Cheyenne 5.7L Excessive Emissions VIN: 1GCEK19M3T
This one is giving me fits. Original problem was P0300 random misfire only on load. After trying everything I finally replaced all injectors with the GM conversion kit from CSFI to MFI injectors. This fixed the misfire problem. It runs perfect. But... imedeatl... Trouble codes: P0420 (TWC System low effeciency bank 1)
1998 Chevrolet Tahoe LS 5.7L Ignition VIN: 1GNEK13R5W
Hello fellow Techs, Sometimes when key is turned on there is no power to anything. No dash lights, no cranking, etc.. moving gear selector or bumping steering wheel will turn it on. At that time the clock reads 1:00. Sometimes when you start it and then move t...
1999 Chevrolet Silverado 1500 5.3L Differential VIN: T6X1508555
Hello techs, dealer got me going nuts, we got this truck that we wanted to install new rear spider gears They sent part# [...] & they swear that those are the ones, well we can not get the spiders to roll in with side gears, the old side gears have 15 teeth...
2000 Chevrolet Impala 3.4L Misfire VIN: 2G1WF55E3Y
Came in with lack of power for complaint. Ran like the converter was plugged. Disconnected at the manifold, made no difference. Fuel filter is new. Fuel pressure is 55 psi. Stall it in gear and it runs great up until .370 volts tps then it is like a switch is ...
2001 Chevrolet Suburban 1500 5.3L Steering/ Suspension VIN: 3GNEC16TX1
Customer brought this in with a popping sound a few weeks ago. This was a loud deep "pop" when you turned right and were rolling. We replaced the Right wheel hub because we had been thru this before on GM vehicles. The noise was gone after the repair. We did n...
2003 Chevrolet Impala LS 3.8L Security light VIN: 2G1WH55K33
Hello, I have This impala that customer states the security light will flash as she is driving down the road and all Lights are flashing like The alarm is going off,There is Also A clicking noise by The glove box area when This is All happening but of course ...
2007 Chevrolet Tahoe LTZ 5.3L radio/chime/window locks VIN: 1GNFK130X7
Can anyone guide me in the right direction on this vehicle. the problem I have is the radio is inop. also the window lockout will turn on but the windows still go up and down and the chime doesnt chime when the key is in the ignition when the door is open. i b...
1999 GMC Savana 1500 5.0L waterpump VIN: 1GTFG15M5X
the van came in with antifreeze coming out the waterpump weepage hole outlet .changed waterpump &stat. refilled ran and purged .let run 2 hrs double checked everything.2 days later its back in with antifreeze coming out from the block and waterpump. replaced g...
1999 GMC Jimmy SL 4.3L Stall VIN: 1GKDT13WBX
truck came in with intermittent stall. checked for dtc's - none. finally got it to stall, but restarts almost every time. sometimes it will crank for 10-15 seconds and sometimes you have to cycle ignition key. fuel pressure stays at 63 psi. if left idling in b...
1996 Pontiac Sunfire SE 2.2L Misfire, MIL Lamp on VIN: 3G2JB5240T
Hello everyone and thank you in advance for any help. We replaced a 2.2 motor in a 96 sunfire. After replacement, the SES light comes on and either code P0300 or P0335 when ever the engine is accelerated. There is no detectable misfire but the scanner confirm... Trouble codes: P0300 (Random misfire), P0335 (Crank sensor circuit A malfunction)
2003 Saturn Vue 3.0L No Start VIN: 5GZC263B83
Car will not start after hot soak . No codes.

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Regal LS 3.8L starter VIN: 2G4WB55K51
Thanks to all who replied. I had the car for 5 days without another failure. It started every time. The other thing I did was wipe the keys off again. I suspect oil from the manufacturing process may have remained on the keys or the pickups.I did try leaving t...
1994 Cadillac Seville SLS 4.6L Excessive Emissions VIN: 1G132A12Q3
sorry for long delay. cust went on vacation. wont believe it. out of all the high tech questions it ended up being a low tech problem. motor oil was 5qts over. thanks again
1980 Chevrolet Corvette 5.7L steering cylinder VIN: 1Z878AS408
Well, once again it pays to be a member of IATN. The general idea that I got from replies was bad pressure from the pump valve, or bad cylinder. I had changed everything in this system with reman parts, except for the cylinder and it was new. I [...] it goes t...
1997 Chevrolet Astro 4.3L Poor Idle Quality, MIL Lamp on VIN: 1GNDM19W1V
Well everyone this one was a nightmare but is fixed. There was a excessive voltage showing a 5 volt reference on the ignition side. This caused the I.A.C & TPS voltage to increase to give the vehicle a high idle. We were running out of time so we called a frie... Trouble codes: P0560, P0748, P1121 (tp sensor ckt intermittent high voltage).
2001 Chevrolet Malibu 3.1L No Start, Cuts out, Stall, MIL Lamp on VIN: 1G1ND52J01
Hi, Thanks to all that replied. Jim, You were right on the money. I was watching the scanner readings, mostly for the MAF, during the road tests. When I did check the MAP, it showed 20hg at cruise. It also showed 20hg at koeo.We replaced the MAP, engine runs n... Trouble codes: P0101.
1999 GMC C1500 Suburban SLE 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GKEC16RXX
found wiring harness from ckp sensor burnt in two from exhaust manifold behind alt. thanks for all who replied. Trouble codes: P0339.
2001 GMC Sierra 2500 HD SL 6.6L No Start, Cuts out VIN: 1GTHK29131
Vacuum tested fuel filter housing, had a very slow leak. Tried to set primer pump would get better but not 100% Replace fuel filter housing, [GM said they have never sold one], replaced, retested held vacuum overnight. Let go, called customer today and said th...
1999 Pontiac Grand Prix SE 3.8L No performance issues VIN: 1GWP12K1XF
Thank you sssooo much for all of your replies. Many of you hit the nail right on the head. This vehicle was in for an oil change back in July at a quick lube, it is apparent that the PCV valve was changed, and the o-ring not replaced, the crankcase vacuum went...
2002 Saturn Vue 3.0L MIL Lamp on VIN: 5GZCZ63BX2
I would like to thank everyone that replied to my post. We had initially cleared the codes and let the customer drive the vehicle over the week end when the problem reoccured. The codes that sent this time were; p0221, p0121, p2135 p0700 and p0638. Found out t... Trouble codes: P1779, P0700, P0121.
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