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Prev Professional Automotive Repair Technical Discussions for July 20, 2009
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Open Help Requests for GM
Help Request Answers
1989 Buick LeSabre Custom 3.8L Noise VIN: 1G4HP54C5K
This is not a normal pump noise, it can get pretty loud. The first time i heard it, i swear it sounded like a rear brake squeal, but it was not. It starts out making noise when coming to a stop, but as the level gets lower, it really starts getting noisy, all ...
1981 Chevrolet C10 Custom 5.0L fuel gauge VIN: 1GCDC14H1B
The gauge will work sometimes but mostly goes on to read full or completley empty at will on both tanks have checked grds an signal from the tanks no opens also any help would be great thanks for your response
1989 Chevrolet Cavalier Z24 2.8L Cuts out VIN: 1G1JF11WXK
This car sat in a customers driveway fro over a year with no plates. He brought it in to us to shape it up so he could give it to his teenage daughter. The car drove in. The customer said it would occasionally stumble at a light. We drained the tank of the old...
1995 Chevrolet Blazer 4.3L Excessive Emissions VIN: 1GNDT13W4S
Hi Smog Tech (CA) and GM tech, we needed help on this Blazer Car came in with fail smog check high nox from another smog check station (gold shield). They replace new cat with aftermarket, they had car for 2 to 3 weeks and gave up. Now we got it, the smog read...
1998 Chevrolet Malibu 3.1L speedometer & fuel gauge VIN: 1G1ND52M5X
Hello everyone, and Thanks in advance for your help. This vehicle has an intermittent issue with the Speedo and Fuel gauge shutting doewn at the same time while vehicle is driving,customer states it stalled too, but just once, I have never had it act up on me,...
1999 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W6X
this vehicle was towed in with a crank no start, found fuel leak at the back of the upper intake. removed plentum, found the injection unit leaking badly. replaced injection unit with updated part. csfi to mfi. also replaced cap, rotor, plugs and wires. still ...
2001 Chevrolet Suburban 1500 LS 5.3L mode accuation VIN: 1GNEC16T91
Vehicle came in with complaint of hot air blowing through the vents, the rear air is cold. Started with the reprogram procedures for the ac control head. Disconnected battery, touched battery ends, and then reconnected and turned on ignition for koeo relearn. ...
2003 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK23113
This vehicle came in last week and the customer stated. Intermittently the engine will turn over but not start. This happens when the engine oil gets low. He has had this problem a couple times. Adding oil has cured it. The last time he added a quart and the v...
2004 Chevrolet Tahoe LS 5.3L Rear heater /AC VIN: 1GNEK13Z84
This is a dual (front and rear ) climate control system that is stuck midrange (so to speak)between hot and cold.Front zones work fine -- only the rear is affected we have .. 1) Reclaimed and placed proper weight charge in system --Front works great both hot ...
2001 GMC C3500 HD 8.1L No Start VIN: 3GDKC34G11
Truck will crank but won't start, it will try to start but will stall within a second. I'm using a Genisys 2.0 and it says "Communication Error, check grounds, fuses and loose connections". I see no problems with a loose connection, grounds or fuses. Thought m...
2006 Other GM P Series 6.0L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 5B4JPD2U86
Thanks in advance for any help. We have this 06 Workhorse chassis with a Gm Drivetrain. We have the MIL on with intermittent communication, also there is only intermittent DTC set with MIL on and/or flashing. Mis-fire counts should cylinders 1,3,5, and 7, only... Trouble codes: P0300 (Random Mis-fire detection)

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Regal 3.1L No Start VIN: 264WB54TXN
Hey Thank you to all who replied. I pulled the cranshaft position sensor wiring harness out and visually inspected the wires. The insulation around the wires was hardened and cracked,shorting out the crankshaft position sensor. i replaced the wires and all is... Trouble codes: 13 (o2 sensor).
1993 Chevrolet Corvette 40th Anniversary Edition 5.7L abs VIN: 1G1YY23P7P
Well thanks to all the Techs that respond to my help request. An alternator fixed this one. The tech help replies suggested EMF interference[AC voltage leak] with ignition wires or an alternator. I had never had this type of condition on any car or truck befor...
2001 Chevrolet Malibu 3.1L parklamp control VIN: 1GND52J016
thanks for all the replies it ended up being a bad headlamp switch sending a high enough voltage signal to the bcm in the off position to make the bcm think the park lamp switch was being turned on.
2004 Chevrolet Suburban 1500 LS 5.3L Cuts out, Stall VIN: 3GNFK16Z44
Apologies for taking so long to close this out. I just heard from my customer and the Suburban is still running great after two weeks. I thank everyone for their input. After testing everything imaginable I decided to go ahead and replace the pump again and... Trouble codes: P0171 (Lean bnk 1), P0174 (Lean bnk 2).
2005 Chevrolet Trailblazer LS 4.2L feul gauge inop VIN: 1GNET16SX5
Thanks for all the help. most of the replys were right on point.the problem was the sending unit.i replaced the gauge on the sending unit, only available from the dealer.this vech is done.
1992 Oldsmobile Cutlass Supreme S 3.1L 1-2 shift VIN: 1G3WH14T1N
Pulled transaxle back out and got an overhaul kit,no sense in getting another used unit,customer agreed to pay for overhaul kit and pay for half of R&R labor cost,rebuild cost free, and we gave him a card for 3 Free oil changes,these days you can't afford to l...
1999 Oldsmobile Alero GL 2.4L Hesitation, Stall VIN: 1G3NL52TXX
Thanks for the help, unfortunately, she needed to use the car and has not returned, she will not return my calls. She is thinking of trading it off, doesn;t want to spend any more money on it. Here are some of the suggestions I received- high fuel psi, bad fue...
2001 Pontiac Grand Prix SE 3.1L Hesitation, Poor Fuel Economy
Thanks for all the help fellas. Congrats to all of you who suggested the cat. We were fooled on this one due to the slight degree of blockage. Combine that with 110 degrees in the shop and Friday...Well, you know. Not real proud of myself and gave away everyth...
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