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Prev Professional Automotive Repair Technical Discussions for July 6, 2010
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Custom 3.8L No Start, Stall VIN: 1G4HR52L0R
Hello all, this car was towed in saying it died going down the road. I go out, check codes and give it a once over under the hood. Nothing out of the ordinary, and above codes found. I am automatically thinking crank sensor with the p1361 but run through the b... Trouble codes: P0341, P1361, P1565
1990 Cadillac Allante 4.5L code 63 VIN: 1G6VS3383L
the brake light will come on when you stew on the brake. checked for codes. found 12 and 63-valve relay fault. read that the 12 will always come up. went through service bulletin trouble tree for abs/tcs system diag. ran into problem with there not being a wir...
2001 Cadillac Catera 3.0L MIL Lamp on VIN: W06VR54R31
Tech 2 shows bank one putting out on avg 18kg per hr and bank 2 shows 13 kg per hr. GM states normal flow is expected between 17 - 21 kg/hr. Swapped O2s, no change,removed tube feeding bank 2 and found clear,checked back pressure on bank 2 via O2 sensor mount ... Trouble codes: 411 (secondary airlow flow detected)
2001 Chevrolet Express 2500 5.0L MIL Lamp on VIN: 1GCFG25M91
This is a good commercial account, they brought the vehicle June 30th and need a June inspection in order to take vehicle out of town. Our back is to the wall and each time we think we have it fixed and drive to reset the monitors, the code comes back. Trouble codes: P0154
2001 Chevrolet Monte Carlo SS 3.8L stereo VIN: 2G1WX15K51
vehicle radio turns on and seems to operate all functions as designed however no sound from all speakers. scanned and found no dtc's. however data list shows amplifier not present. refer to svc info from alldata. tested amplifier enable signal and find it is f...
2002 Chevrolet Cavalier LS 2.2L Transmission VIN: 3G1JC52482
My daughter's car, she has been having this problem for quite a while now, while cruising down the highway, it will downshift from overdrive to drive all on its own. It will do this for 10 seconds or so and then shift into overdrive again. There are no codes, ...
2003 Chevrolet Suburban 1500 LS 5.3L Valve Train VIN: 1GNEC16Z83
I have a noise in the valve train. A tapping that increases in volume from being barely discernable at idle to a sharp staccato sound above 2k rpm. Cancelling cylinders via injectors makes no change whatsoever. We removed the driver valve cover and ran the en...
2004 Chevrolet C5500 Kodiak C5E042 6.6L Excessive Emissions, Stall, Poor Fuel Economy VIN: 1GBE5C1214
I have a upset cust. he spent all his money and truck runs worse than it did. The complaint is excessive black smoke on take off,hard start or start then stall,and no low end power. Cust. stated that he was having to change the fuel filters around 3500 to 4000... Trouble codes: P1093
2005 Chevrolet Suburban 1500 LT 5.3L Vses VIN: 1GNFK16Z95
This Suburban sets code C0131 at key up about 25% of the time. The pressure sensor always shows 0psi and .5 volts on the tech2 regardless of weather the code sets or not,and gradually goes higher as you step on he brakes. Ofcourse the scan tool wont function a...
1996 GMC K3500 Sierra SLE 7.4L Fuel Gauge VIN: 1GDKC34J1T
Customer states the fuel gauge moves from empty to full on occasion. He says he doesn't really know where the fuel level really is. This vehicle is a flatbed with dual tanks. When you first turn the key on the needle will bounce to max full and then back lt to...
1997 GMC Safari 4.3L Blower Motor VIN: 1GKDM19W9V
On the vehicle listed in the thread title, the blower speed works only on #2. Speeds #1, #3 and #4 are inop. I plead guilty to jumping the gun in calling a blower motor resistor. Replaced the reistor new from GM, and the same thing happens. Speed #2 is the o...
2003 GMC Sierra 2500 6.0L 1-2 Shift VIN: 1GTHK29U23
After driving for 15-20 minutes the truck will start out in 2nd gear for a split second then shift down to 1st gear. Fluid is nice and clean (even before valve body removal) the 1-2 shift solenoid is on and the 2-3 shift solenoid is off when this happens, whic...
1995 Pontiac Firebird Formula 5.7L cooling fan VIN: 2G2FV22P3S
after driving car to operating temperature, shut off the car and let it sit for a few min. then start it, put it in drive the fans turn on then stay on until pull it out of gear. coolant temp not overheating and check eng light comes on. When i hook up the sca...
2002 Pontiac Grand Prix SE 3.1L Compressor VIN: 1G2WK523X2
Car came to me with compressor not engaging. Found that harness had rubbed against accumulator, fixed that. Pcm now recieving info from pressure sensor. Compressor still not engaging,pcm recieving request from hvac control mod. Pcm will not command relay on, c...
1999 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZF528XX
Customer may drive this car for days before it causes the light to come back on with these EGR faults. Voltage may be on the low side sitting in the shop but not this .04 volts and cannot duplicate this problem. Tried replacing valve twice using AC Delco parts... Trouble codes: P0405 (EGR Valve Position Sensor Circuit low voltage), P1404 (EGR Valve Sensor Closed Pintle position), P1599 (Engine Stall or Near stall detected), P1620 (Low Coolant Switch circuit)

Fixes & Summaries for GM
Fix/Summary Answers
1985 Buick Regal Grand National 3.8L Hesitation, Misfire VIN: 1G4GK4791F
i would like to thank everyone that responded. the fix for this car was the crankshaft position sensor connector had come off of the bracket and was rubbing on power steering pulley and was shorting to ground. noticed this when attempting to get a waveform of ...
1996 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY5297T
Sorry it took so long to close this request. But that for all of your help. It turned out that the timing chain was off one tooth. Causing an in correct signal. Trouble codes: P0340.
1997 Cadillac Seville SLS 4.6L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G6KS52Y9V
Ok everybody this one is a confirmed fix. Thanks for all the help. We unplugged the transmission connector (thinking maybe the shift sol was bad) but it still popped the fuse. We then just took the fans, etc.. out of the way and opened up the wiring harness. F...
1988 Chevrolet K3500 Silverado 7.4L No Start, Stall VIN: 1GCGK34N3J
After several test on fuel/pump oil pressure switch being incolclusive, i just ordered one from Napa and the vehicle is gone, never have I seen these switches fail and kill injection. from teh wiring it appears its only function is a backup for the fuel pump r...
1997 Chevrolet K1500 Suburban LS 5.7L Transmissioj VIN: 1GNFK16R0V
Thank You to all that responded especially Martin (I owe you one) After taking everyones advice and checking line pressures, wiring, ect. We decided that we would once again check fuel pressures . Pressures were all at specs but still acted like the trans woul...
1991 GMC Tracker 1.6L No Start VIN: 2CKBJ18U4M
replacing the ecm was the fix now the unforeunate part is they seem only to last long enough to get past the warranty period did like the idea of running a relay to pwr up the injectors and the fuel pump if and when the next one goes thanks for the replies
1994 GMC G2500 Vandura 5.7L Hesitation, Cuts out, Stall, Poor Fuel Economy VIN: IGDEG25KRF
Well after all the headaches this van is finnally fixed.Thanks to everyone who responded.The fix ended up being the coolant temp sensor.It was showing crazy readings once the van ran for more than 3-4 minutes causing it to go full rich.Thanks again for the hel...
2001 GMC Safari SL 4.3L No Start, Stall VIN: 1GTDM19W01
Unplugged the SIR ECM and the vehicle runs perfectly. Had to cut away the rubber floor to get to it, it was highly corroded and because the van was used for food transport, something got spilled and it manifested into a horror of sugar bubbles and bugs. When...
2003 GMC Sierra 1500 SLE 5.3L Drivers Information Center VIN: 2GTEK19T13
I will close this as a fix even though I haven't replaced the dash yet, I'm sure all of your advice is correct about the dash needing replaced. I was looking to find out if a reflash was needed since the only thing effected was the language. A special thanks g...
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