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Prev Professional Automotive Repair Technical Discussions for June 10, 2009
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Open Help Requests for GM
Help Request Answers
1995 Cadillac Seville SLS 4.6L MIL Lamp on VIN: 1G6KS52Y6S
The light comes on AFTER the vehicle is started (usually around 1200 rpm in Snapshot), this is important for the trouble tree. Followed the trouble tree and came up with problem not present at this time. Scoped Ignition Control and 4X signals, both good 0-4.5V... Trouble codes: 23 (Ignition Control Circuit Problem)
1990 Chevrolet K1500 Cheyenne 5.7L pcm VIN: 1GCDK14K4L
Hello Friends, Passing gear will set a spark timing code 43 with MIL and (lack of power, after the code sets),every time. The dtc chart has you rap on the engine block and watch the scanner, whick the scanner does indicate knock. The diagnostic aids has you ch...
1995 Chevrolet p-30 5.7L preignition / knock VIN: 1GBJP32K1S
vehicle came in with engine noise . diagnose broken crankshaft...replaced the engine with a good running used that we drove into the shop . change all sensors and tbi onto the donor engine and test drive .severe preignition .adjusted timing to 0 degrees (still...
1998 Chevrolet Metro 1.0L MIL Lamp on, Will not idle VIN: 2C1MR2263W
Customer complaint of no idle and after driving 30-40 minutes loosing power and dying. Customer will have to charge battery and then he can drive for 30 more miles. I found vehicle is running rich, short term fuel trim is -20%. You have to press pedal down hal... Trouble codes: P0141 (O2 Heater Circuit Bank 1 Sensor2)
1998 Chevrolet K2500 Cheyenne 5.7L Rear brakes VIN: 1GCGK29R3W
Hello, Customer came in with this truck for a brake vibration. Vehicle was road tested and the vibration appeared to be coming from the front and rear brakes. We were able to confirm rear brake vibration by applying the park brake while driving. Pulled all whe...
2000 Chevrolet Malibu LS 3.1L Surge, Stall VIN: 1G1NE52J5Y
Vehicle stalls on start up after sitting for 10 min. Vehicle has 1200 rpm flare up. Seems like there is no "base idle". Engine stalls twice. Third time it hunts. Fourth time it's fine. Car runs and drives fine, no idle hunting. When restated right away, idle i...
2002 Chevrolet Silverado 1500 5.3L Rear Differential VIN: 2GCEK19VX2
Im trying to find a cause for milky fluid. We changed the gear oil durning the last service, approxiamtly 3000 miles ago because the fluid was milky. We pull the cover for our diff services. the diff gets drained washed down with Shop Solve and dryed with air ...
2004 Chevrolet Cavalier 2.2L Excessive Emissions, No Start, Poor Idle Quality, Poor Fuel Economy, No power VIN: 1G1JC52F24
I have one of those great ECO techs. I will tell you before I get started that in the morning I am going to check the timing chain because I started this thing up cold this evening and it was rattling pretty good. So maybe a jumped a tooth or two? So here it ... Trouble codes: P0172 (Rich exhaust)
2004 Chevrolet Express 3500 6.0L Misfire VIN: 1GBHG31U74
Vehicle has a misfire on cylinder #2 & #6 at idle only. It trips the code mostly when cold after running for 2-3 minutes. Eventually the MIL light will come on. We have replaced plugs, wires, swapped coils with different cylinders, flushed injectors twice, ins... Trouble codes: P0300 (Misfire)
1991 Oldsmobile Cutlass Supreme SL 3.1L No Start, Cuts out, Stall VIN: 1G3WS54T5M
THIS IS A INTERMITTED PROUBLEM . CAME IN COUSTMER COMPLANED IT WOULD STALL AND CUT OUT . AND COMPLANED SOME TIMES NO START . WOULD HAVE TO WAIT 45 mint before restart. the car acts like it starving for fuel . it starts fine but most the time stalls and restart... Trouble codes: 35 (i a c)

Fixes & Summaries for GM
Fix/Summary Answers
2004 Cadillac Escalade ESV 6.0L MIL Lamp on, TIGHTEN FUEL CAP VIN: 3GYFK66N04
after replacing fuel level sensor,returned vehicle to customer no return after 2 weeks Trouble codes: P0455.
1999 Chevrolet K2500 5.7L Excessive Emissions, Cuts out VIN: 1GCGK23R0X
Ok I finally got this thing to show a severe misfire on #5 cylinder at 14-1500 rpm. swapped spark plug with #1 misfire went away #5 was fouling. Did a leakdown check and found air going right out the tailpipe. Pulled heads and found one with a huge crack in it... Trouble codes: P0138.
2001 Chevrolet c6500 7.8L Starting VIN: 1GBJ7H1C71
I apprectate all the help. Everything I tested was good. I have good signal to and from all the sensors but no signal to the injectors. I suspect it is the ecm but without anyway to prove this I am refreeing this to the dealer.
2003 Chevrolet Silverado 1500 HD LS 6.0L Right Turn Signals VIN: 1GCGK13U63
Thanks for all of the help. The u1000 code ended up being a blown maxi fuse for the power windows, unrelated to the lite problem. After spending lots of time looking for an open in the blue wire for the right side turn signals I decided to cut it and run my ...
2005 GMC Envoy XL SLE 4.2L blend doors VIN: 1GKET12S54
thanks to all who replied it was bad blend module acuator plastic end was broke off were it attaches to blend door-- seeya on to another challenge
2001 Pontiac Montana 3.4L No Start, Cuts out VIN: 1GMDX03E71
the crank sensor that was installed was faulty, replaced, ok Trouble codes: P1189 (Engine Oil Pressure circuit).
2003 Pontiac Grand Prix SE 3.1L No Start, Stall, MIL Lamp on VIN: 1G2WK52J73
Thanks all (Gordon, Christopher, Cenen, Charles, Robert, and Matthew) for the great input, Sorry it took so long. I sorta feel Dumb in that I shoulda just Programed the replacement computer and let it go, given the total failure. Instead I Check every sensor a... Trouble codes: P0122 (TP Circuit Low), P0452 (Evap Pressure Signal Low), P0462 (Fuel Level Sen. Low Volt or Short), P1122 (TP Cir. Int. Low), P1635 (5 Volt Ref. Cir A Low), P1639 (5 Volt Ref Low TCM A/O Fault).
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