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Prev Professional Automotive Repair Technical Discussions for October 2, 2012
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Open Help Requests for GM
Help Request Answers
1986 Cadillac DeVille Touring 4.1L electronic climate control VIN: 1G6CD6987G
this car is a friend of ours and the fuel display screen and climate control screen is inop the only thing that shows up is the letter D on both screen and no heater control any of you cadi guys ever come across this before let me know or any ideas i havent wo...
2009 Cadillac Escalade 6.2L front suspension VIN: 1GYFK23289
Truck rides as if front suspension has no shocks/springs, like body is fastened directly to front differential. Scanned suspension system, no codes (OTC scanner). Ran test on compressor test, compressor will pump up rear suspension, air will exhaust at complet...
1996 Chevrolet K1500 Cheyenne 5.7L power steering VIN: 2GCEK19R1T
I have a simple system that is turning out to be a headache. I have power steering that works fine when driving, but in the parking lot it goes away. If you sit still and turn the wheel back and forth a few times the power steering quits and the fluid gets aer...
1999 Chevrolet K1500 Suburban 5.7L 2nd gear VIN: 3GNFK16R0X
Hello there I have this Suburban and I got it from cust with second gear missing. I don't get into fixing transmissions so I took it to a very reputable transmission shop and they looked at it and said second gear band is bad. With that i quoted out a price to...
2001 Chevrolet Impala LS 3.8L Mechanical VIN: 2G1WH55K21
At 40 and 50mph the vehicle will buck let off the thottle all is well when this happens if you touch the brakes also will go away no codes no ses light looks like on the scanner tcc if not sure where to be any ideas
2007 Chevrolet Malibu LT 3.5L flex plate VIN: 1G1ZT58N57
costumer said that motor had internal damage by another shop.i check it and i found an exhaust leak and a loud noise at above 2000 rpm.sound like scrapping noise only,not like a knock.i pulled the stater off to confirm my susspision that the fly wheel was scra...
2009 Chevrolet Tahoe LS 5.3L MIL Lamp on, P1174 VIN: 1GNFK03069
Hi all, this is one of our ems trucks for moving people and supplies around. P1174 came on about 200 miles ago and i looked it over and didnt see anything wrong. Made note of code and date in door jam and cleared codes. Less then 100 miles code is back. Ordere... Trouble codes: P1174 (fuel trim cylinder balance bank 2)
1997 Geo Prizm 1.6L Brakes VIN: 1Y1SK5260V
Customer states that car loses power and won't go over 30 mph. I test drove car over a period of 3 days and finally the problem reared its ugly head. Turns out the car was losing power due to the All Four Brakes Being applied. Both front brake pads lining wh...
1999 GMC C2500 Sierra SLE 5.7L Poor Idle Quality, Misfire VIN: 1GTGC24R7X
I have instsalled a new updated injection from central SFI to MFI on this vortec and this truck isnt running on #5 #7 #6 #8 it is still reading full rich and at about 2500 to 3000 rpm it clears up fuel trim reads -30 on both banks and o2s read full rich at idl...
2000 Pontiac Grand Prix SE 3.8L No Start VIN: 1G2WJ52K4Y
Hey guys need some help on this one does this this pontiac have a bcm and vtd module alldata is not giving a good description on a 2000 model! need to get this pon figured out! it starts and runs for about 5 seconds and dyes with the the theft light flashing t... Trouble codes: P1629
2004 Pontiac Grand Prix GT2 3.8L Theft System VIN: 2G2WS54284
This car had an issue with mph not reading correct so i replaced the cluster with a used on . The prob. Was the miles on the new used one was too much more so without starting the car i put the original one back , but when i tried to start it the theft indicat...
2006 Pontiac G6 GT 3.5L engine VIN: 1G2ZH55816
Engine has been replaced due to broken piston ring. on occasion it will stall turn the key warning light will come on but car will not crank. after sitting for 1 or 2 minutes will crank and start fine Only has done this 3 times. No warning, might go for a week...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Chevrolet S10 LS 4.3L Poor Idle Quality, Misfire, Low Power VIN: 1GCDT19W0R
Very low running compression. With an adjustable spark tester (air gap mimics plug gap in running engine) on the ignition wire and the compression gauge installed, there is little more than 25 PSI on all cylinders. Raising RPMs brings this to about 50 - 75 PSI...
1994 Chevrolet Lumina APV 3.8L Fires, then dies
Well it works...after many replies it did turn out to be a passlock problem of sorts. Many suggestions were related to this system even though the van was not so equipped. after eliminating other options suggested such as ignition switch, cam and crank sensors...
1998 Chevrolet Tahoe LS 5.7L Unknown VIN: 1GNEK13R6W
Turned out to be a bad exhaust Valve on cylinder #3, Seems to be a poorly rebuilt engine, customer declined any further repair , will update if i get to tear it apart, thanks for all the help
2006 Chevrolet Silverado 2500 HD LT 6.6L fuel prime VIN: 1GCHK23D86
Tthe filter housing seems to have done the trick but then the water pump was leaking and that was a fun one HAHAHAH not to bad if you had done one before and the flywheel holder helped a lot too.
1996 GMC Sonoma SLE 2.2L battery and alternator VIN: 1GTCS1943T
Replaced the alt ,that took care of that part. Put my 1816 bulb between the - batt post and cable so I could see when the drain went away and started to disconnect wires,got to the junction block on left fender removed big red wire and light went out then re...
1998 GMC K1500 Sierra SL 5.7L Poor Idle Quality VIN: 2GTEK19R8W
I apologize for the delay in posting this fix. After a bit of a hiatus from this vehicle, we were finally able to get back to it with a fresh look at things. Very close monitoring of the engine crankshaft sensor signal during the warmup period revealed the v...
2001 GMC Sierra 2500 HD SL 6.6L tcm VIN: 1GTHK29171
bit the bullet convinced the customer to install reman for a 2001.i will eat the labour cost and refund the cost of the used transmission.thannks guys.
2007 GMC Yukon XL 1500 SLT 5.3L Fuel Filler VIN: 1GKEK16317
1991 Oldsmobile Cutlass Ciera S 2.5L Misfire, backfire, hardstart VIN: 2G3AJ14R1M
The final 2 pieces of the puzzle were a bad circuit board in the ecm I was able to solder (hard/no start issue) and a faulty ignition control module (off idle consistant misfire, ocassional backfire). Thanks to everyone for all the ideas and help!
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