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Prev Professional Automotive Repair Technical Discussions for September 19, 2011
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Open Help Requests for GM
Help Request Answers
2001 Cadillac DeVille 4.6L Unknown VIN: 1G6KD54Y01
Hi, everyone this car came in for door locks and window not operating. Checked all ground and power wiring , everything looks ok. With the remote entery door locks working , which tells me (ddm)is working fine , right front window working fine but other windo...
1991 Chevrolet Camaro Z28 5.0L Cuts out, Stall, no power VIN: 1G1FP23F2M
Trying to find cause of repeat fuel pump failures, pulled tank down and looked for any debris or loose baffles everything looks good. We are changing strainer and fuel filter everytime also. The low amps looks to me like something is clogging strainer, but its...
2001 GMC Yukon XL 1500 SLE 5.3L Surge, MIL Lamp on, Low power VIN: 3GKFK16T61
We don't work on many of these around here so some advice would be appreciated. The customer originally brought it to a local exhaust shop and they replaced all the O2 sensors and both cats. Lots of shiny parts under this vehicle. (see code list) The custome... Trouble codes: P0153 (O2 sensor circuit slow response B2 S1), P0155, P0131 (O2 sensor low voltage B1 S1), P0151 (O2 sensor low voltage B2 S1), P1153 (O2 Sensor insufficient switching B2 S1)
2003 GMC Safari 4.3L Misfire VIN: 1GKEL19X43
This van has been in and out of the dealership a few times and never been fixed.While driving up hill usually,under load, just before it shifts into overdrive, it will miss for a couple of seconds then go away. It will set the check engine light on and sometim... Trouble codes: P0101, P0300
2005 GMC Sierra 1500 5.3L MIL Lamp on VIN: 132FDOI1CD
truck keeps throwing PO446 code replaced vent solenoid and carbon canister as both were full of dirt and would not close solenoid has been back twice now for same code we can hear click (open/close) with scanner vent should be working Thanks for your help we d... Trouble codes: P0446
2005 Pontiac Grand Prix GT 3.8L Suspension VIN: 2G2WP52245
There is a pronounced rear suspension noise going over bumps. Its quite load. Will do it on a small bump too, like pulling into the shop, just the concrete lip into the garage, load clunk. Happens always. If I jump the rear(jounce) it will not make the noise. ...
2004 Saturn Vue 2.2L Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 5GZCZZ3D84
and now when you go to start it.It runs rough for about 15 sec. no throttle response and then shuts off. when you go to crank with out cycling the key we see no spark if you turn ign. switch off and then back on it will start up again we have replaced the thro... Trouble codes: P1599

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Regal Custom 3.8L Poor Idle Quality VIN: 2G4WB52L2S
Thanks to all the replied to this help, David from Manitoba was right on the money only our problem was occurring all the time. We double checked all the readings, checked and disconnected the cruise, checked the throttle plate and checked the idle screw then ...
1995 Buick Regal 3.8L No Start, long crank VIN: 2G4WB52L2S
Thanks for all the replies. The consensus seems to be cam, crank, injector or fuel pump. If the customer brings the car back I will check these things first. Unfortunately he barely drives the car and is not interested in spending much time or money on it. ...
2005 Buick LaCrosse CX 3.8L Stall VIN: 2G4WC53215
sorry for the delay on the fix,this is a family members car,he was doing some of the diagnosing him self and would call me from time to time,it turned out to be a bad crank sensor,thanks for all the replies
2006 Buick Terraza CXL 3.5L chime VIN: 5GADX33LX6
Checking all modules for codes, I found 2 codes in the seat module that related to the seat memory switch. I pulled the switch and touched the pins on the connector with a test light and that re-created the same chime. Found that the switch was shorting to g...
2002 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK29192
This appears to be a injector issue with too much bypass/return back to tank. I am waiting for the customer to get a new set of injectors. Thank you for tour time, Mark
2003 Chevrolet Silverado 2500 HD 6.0L MIL Lamp on VIN: 1GCHC24U73
Still working with this, Delco Rep suggests we rewire pins at computer from throttle. Thanks for your help folks. Trouble codes: P0120, P2135 (tp snsr 1-2 correlation), P0332.
2003 Chevrolet Trailblazer LS 4.2L smell of fuel VIN: 1GNDS13SX3
Thanks for all the information I am waiting for customer to get back to me so I am going to close this and will updat when I hear back and or fix the vehicle. Thaks again, Stan.
2004 Chevrolet Express 3500 6.0L No Start VIN: 1GBJG31U94
Thanks to Michael from Connecticut, for the voltage readings of 10v. Although that didn't totally solve it, it put me on the right track. And Todd from Michigan, for confirming the crank sensor voltages, and Carter from New Mexico for also helping to point in...
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