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Prev Professional Automotive Repair Technical Discussions for August 6, 2009
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Open Help Requests for GM
Help Request Answers
2005 Cadillac STS 4.6L power assist VIN: 1G6DC67A35
Hello! Have a Caddy with lack of power steering assist. Is very stiff to turn wheel, unless light acceleration is applied then power steering works great. I dont have a p/s pressure gauge, but on the return line at the pump, fluid flow looks good until you try...
1993 Chevrolet C1500 Cheyenne 5.0L Poor Idle Quality, Hesitation, Stall VIN: 1GCDC14H8P
this truck came in and would not idle in gear or in park.check for codes and found code 33 and code 44.check for problems and found both sensors to be "good".replaced fuel filter due to 8 psi and repaired that problemnow has 12 psi fuel pressure.unbolted exhau... Trouble codes: 33 (map sensor circuit too high), 44 (lean exhaust)
1995 Chevrolet K2500 6.5L MIL Lamp on VIN: 1GCFK24SXS
have a strange one here need help. vehicle came in with a complaint of lacking power and a ses light on found a code for the waste gate solenoid traced the problem down to a bad pcm. replaced pcm with a remaned code went away and vehicle had all it's power bac... Trouble codes: 56 (injector pump calibration)
1998 Chevrolet C3500 Cheyenne 5.7L Front Brake pull VIN: 1GBJC3R0WF
Hi. Well I have a fun one here and am looking for a little help from the GM guys. I have a C3500 dual rear wheel truck that dives great down the road under all conditions other then hard rapid brake application. It pulls left then right and then no pull.Very r...
2002 Chevrolet Trailblazer LS 4.2L Alignment VIN: 1GNDT13S82
Looking for ideas on camber and caster adjustment. ESI states loosen lower control arm bolts and move lower control arm. Niether the control arm nor the bushing are slotted. The control arm hole might be slightly larger than the bolt., but not enough for any r...
2002 Chevrolet Tahoe LS 5.3L Stall VIN: 1GNEK13Z12
This truck stalls intermitantly hot only it will start up again and run fine some times have to crank more than once before it starts up again. When it dies the fuel gauge goes to empty and the ses light flickers and loss of scanner comunication also had the f...
2003 Chevrolet Suburban 1500 LT 5.3L Tachometer VIN: 1GNEC16T23
Owner states during start-up, Tachometer needle abruptly drops under zero and a ratchet-y noise is audible. One engine starts, Tach functions normally, noise gone. Owner also states left side of Speedometer is dimmer than right, not unreadable but about 20%. C...
2003 Chevrolet Venture LS 3.4L MIL Lamp on VIN: 1GNDXO3E53
this wonderful venture is a ongoing nightmare everytime you touch it something else goes wrong .today problem is have codes po138 po171 po1133 o2 codes and a lean code. two o2 system front not switching rear high aprox 965mv constant cant see it to be a comput...
2005 Chevrolet Suburban 1500 Z71 5.3L No power VIN: 3GNFK16Z25
The client complaint is this vehicle will have a no acceleration issue intermitantly. Press the throttle and nothing happens, or a bucking intermitant throttle responce. I have not been able to duplicate the issue while on test drives, or in the shop. To date ...
2005 Chevrolet Silverado 3500 6.6L Poor pedal VIN: 1GCJK33265
Hello all GM Truck Techs, So the issue here is this truck has a customer complaint of a "something wrong with brakes" This truck belongs to a friend of mine who has let me borrow in the past. Every time he has lent it to me he has mentioned the brakes to me. I...
2006 Chevrolet Equinox LT 3.4L Blower Motor VIN: 2CNDL63F66
Vehicle came in for blower motor not blowing. Checked it out and found not blowing in any speed. Followed flow chart and it came down to replace the blower motor resistor, which I did. Same thing. Still inop. It seems that I only have 9 volts at the blower mot...
2007 Chevrolet Cobalt SS 2.4L electric steering VIN: 1G1AM15B37
power steering goes away completely. can turn key off and start back and will be ok again for a while. message comes across dash- power steering. doesnt alwys do it. never gives warning. co475 is only code- electric power steering circuit.
2000 GMC Jimmy Diamond Edition 4.3L unknown VIN: 1GKDT13W3Y
This Envoy will stumble and buck during launch. The type of launch does not matter, light throttle to full throttle. In fact, the stumble acts like a primary or secondary ignition miss. We checked engine drivability. No problems found. We then discovered that ...
2001 GMC Yukon SLE 5.3L MIL Lamp on VIN: 1GKEK13T41
I hope someone can point me in the right direction because this small leak is killing me. Yukon came in with check engine light on with p0442 small evap leak. closed system with scanner and smoked it. found evap vent valve leaking as well as fuel cap. vent val... Trouble codes: P0442
2003 GMC Sierra 1500 5.3L Evaporator Housing VIN: 1GTEC14TO3
Greetings fellow techs, Got a wierd one here. Well customer brought in this single cab truck with A/C system working extremely well. Customer complained of water in floor board. I smelled the towel that he wiped it up with and it doesn't smell like antifreeze....
1991 Oldsmobile Cutlass Ciera 3.3L No Start VIN: 2G3AJ51N5M
2 weeks ago poor idle no communication with scanner, replaced pcm (used) and all is well. came yesterday no start, no injector pulse scoped crank sensor 3x and 1x good pattern at ICM Scoped signal to and from ICM and PCM both good pattern put back old PCM stil...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick LeSabre Custom 3.8L Noise VIN: 1G4HP54C5K
I replaced the fuel tank and that took care of it. William, Rob and Ken hit it. The customer didn't like it, but that's the way it goes.
1995 Buick Park Avenue 3.8L Charging VIN: 1G4CW52KOS
Hello fellow techs.This park avenue is fixed and the customer is happy and I am happy.Thanks to all the techs who took the time to respond to my help request.Bill and Ron gets a special thanks for their response about the ign module. After pursuing all the ide...
2003 Buick LeSabre Limited 3.8L MIL Lamp on VIN: 1G4HR54K73
Thanks guys for all of the suggestions. found out that I had 2 issues going on here. The ABS module had taken a dump, And the ignition switch was dropping power out on the pink wire intermittetly. Took a bit of Diagnostic time but we got it fixxed. Thanks a... Trouble codes: P1571 (TCS PWM circuit no frequency/ signal), U1040 (Lost communication EBCM/EBTCM), P1689 (TCS deliverd torque fault), U1255 (Loss of class 2 communication).
2005 Cadillac Escalade ESV 6.0L Heated seats VIN: 3GYFK66N35
The replies were split between the switch and the drivers door module. I'm leaning towards the module because it clicks on and off intermittently. I told my wife if she can let me have the car one day I can maybe accurately diagnose it. The dealer says the ...
1994 Chevrolet Corvette 5.7L Accessories VIN: 1G1YY22POR
The Tech1 flashed it with only the Mass Storage Card, Body cartridge is not needed. Not familiar with this scan tool, found out you have to scroll past PCM, ABS, BCM, and proceed to programing, then the rest is obvious. The Tech2 does not work due to software ...
1995 Chevrolet K1500 5.7L Stall, stalls in gear only VIN: 1GND123456
well thanks for all the input...yes it was a weak pick-up in the dist. also the harmonic balancer had slipped a bit causing inacurate timing. i made my own marks and we were good to go! thanks again
1996 Chevrolet K1500 5.7L Misfire VIN: 1GTEK19R4T
unfortunately, none of the replies were helpful. the fix was to warranty out his cardone distributor. i received a call from identifix yesterday, and was told that in one other instance, the cam sensor caused this exact issue. on his advise, i unplugged the ca... Trouble codes: P300.
1996 Chevrolet K1500 Cheyenne 5.7L Poor Idle Quality, Misfire VIN: 2GCEK19R0T
Pulled out the oxygen sensors and no difference in the way it ran. Replaced the injectors with the updated part and the problem went away. Trouble codes: P0161, P0172, P0175, P0300.
1999 Chevrolet Tracker 2.0L No Start, Stall VIN: 2CNBE18C6X
Thank you to all that responded. I replaced the pcm and still had the same problem. I didn't like it, but I sent this one to the dealer. I will update post when I hear what the dealer found. Thanks again.
1999 Chevrolet Cavalier Z24 2.4L valve train VIN: 3G1JF12T9X
thanks for all the replies found oil gallies gunked up which also caused a spun bearing at this time customer plans on trading vehicle in for a new one thanks again for all the replies oil pressure dropped after runnimng for 15 min due to gu...
2002 Chevrolet Express 2500 LS 5.7L MIL Lamp on VIN: 1GAGG25R42
informative only repair is listed above. this vehicle had gone to the dealer for 2 injector cleanings and a reman. pcm then it went to another shop and they cleaned the injectors and did a full tune up then I got my shot at it. When vehicle arrived it had a c... Trouble codes: P0200.
2002 Chevrolet Malibu 3.1L Unknown VIN: IGINE52J92
I forgot to tell everyone that I put a new control head in it already. The new one was bad. so all replies were right. thanks
2004 Chevrolet Express 3500 6.0L Surge, Stall VIN: 1GCHG35U54
after checking everything i could think of and everything you all suggested. spoke with local chevy dealer shop foreman,he suggested that if everything else checked out to replace the intake gaskets just to eliminate them. he has seen lots of them go bad,and y... Trouble codes: P0506, P0507.
2005 GMC Envoy SLE 4.2L Hesitation, Stall, MIL Lamp on VIN: 1GKDT13S85
I want to thank everyone again, after rechecking the timing multiple times I moved the exhaust cam 1 tooth and found that the flat spot in the back is way off, so you would know if you were off a tooth. I pulled the exhaust cam and found scuffing/wear on beari... Trouble codes: P0017.
2005 GMC Safari 4.3L MIL Lamp on VIN: 1GKEL19X55
we finally got a oe sensor. the heater circiut was about 13.8 ohms vs about 8.5 for the bosch far it passed its 1st monitor ck. will keep you all advised. thanks alot for your input. david Trouble codes: P0053.
2003 Saturn Ion-3 2.2L head lights VIN: 1G8AL52F63
This car came in with headlights inop. I had just taken over the used car team in my dealership. I have no reference material available yet and the used car manager opted to "wholesale this one". Thanks for the reply from everyone. I took a W.A.G. at the BCM b...
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