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Prev Professional Automotive Repair Technical Discussions for November 29, 2010
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Open Help Requests for GM
Help Request Answers
1998 Buick Park Avenue 3.8L mode doors
Greetings fellow techs, Got this 1998 Buick Park Avenue late in the day with the customer complaint of the AC/Heat not switching modes. Everything is coming out the center vents no matter where the control is set. There are no codes in the system. Normally I w...
1999 Buick Regal GS 3.8L Starter, DRL, OD VIN: 2GAWF52L3X
I get all the junk. This S/C regal came in with the customer stating that he hit a bump and now the car wont crank. I was trying to test the starting system when the auto headlights came on and the vehicle began to start every time. Then the lights went off ag...
2004 Buick Rendezvous CX 3.4L Steering Wheel VIN: 3G5DA034E4
There is an intermittant vibration felt in the steering wheel mostly when making right turns. It also can be felt when parking the vehicle and the steering wheel is moved slightly. It is accompanied by a slight whine. System was flushed using BG products. Coul...
1999 Cadillac Seville SLS 4.6L Not sure VIN: 1G6KS54Y9X
There is a distinctive random knocking occuring in the flexplate area that is liken to that of a loose torque converter nut(s) when listening with a stethescope. We checked the crankshaft end-play and it measured .011- well withing spec. I know that these 4.6L...
2007 Cadillac DTS 4.6L Sensors VIN: 1G6KD57Y17
I am not sure the system was working correctly in the first place as displayed tire pressures were inaccurate across the board. If a sensor is bad how do you know? The left tires will not cause a system chirp when changing pressure in those tires while in the...
2000 Chevrolet Express 2500 5.0L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCFG25M5Y
vehicle came in barely idling with definite rich smell, chugging exhaust output. does this all the time worsens as engine warms up. stalls when in gear especially on brakes. checked vacuum leaks, all parts listed were tried and or replaced. ohm'd harnesses inc... Trouble codes: P0300
2002 Chevrolet S10 Xtreme 4.3L Poor Idle Quality VIN: 1DCCS19W71
Truck drives and idles fine, but while driving when you let your foot of accerator truck adles high 2200 rpm if while you are cruising and push in trhe clutch truck idles high when you hit the brake the truck comes down to normal idle during the summer months ...
2003 Chevrolet Silverado 2500 HD LS 6.6L Glow Plugs VIN: 1GCHK23163
Unit came in on the hook and would crank and no-start. Hooked up scan tool and began to diagnose. No DTC's, unit had good cranking speed (book calls for 100RPM cold and 180 warm) unit was at about 140. Desired FRP is 25-40 and actual is running dead on. Interm...
2004 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCDT13X74
we verified the codes cleared and reset. went through the diag for p0135 assuming the cause might be the same for all 3 codes. the diag led us back to needing an ecm, and since we have had to replace ecm's for this problem in s-10s before it seemed reasonable.... Trouble codes: P0135 (HO2 Sensor heater performance bank 1 sensor 1), P0141 (HO2 Sensor heater performance bank 1 sensor 2), P0155 (HO2 Sensor heater performance bank 2 sensor 1)
2005 Chevrolet Malibu LS 3.5L MIL Lamp on VIN: 1G1ZT55485
This is mainly just for information. I got all of these codes when the car first arrived. I cleared the codes and immediately P2125 and P2138 came back. Upon testing the wires i have found that the LT/BLU wire is open. However, the wiring harness runs undernea... Trouble codes: P0463 (Fuel Level Sensor Circuit Problem), P0826 (Up Down Shift Switch Circuit), P1125 (TP/APP Sensor Circuit Problem), P2120 (APP Sensor 1 Circuit), P2125 (APP Sensor 2 Circuit), P2138 (APP Sensor 1-2 Correlation)
2006 Chevrolet Avalanche 1500 LT 5.3L Hesitation, MIL Lamp on VIN: 3GNEK12Z76
Hey all. I have a problem with a 2006 Avalanche with all signs pointing to the PCM. You don't see to many PCM problems these days. Nothing personal, but I hope somebody else has had this problem. The truck came in on the hook. Customer complained of check engi... Trouble codes: P0107 (Map/baro sensor low voltage), P0068 (Airflow performance)
2007 Chevrolet Suburban 1500 LT 5.3L Oil pressure gauge VIN: 1GNFK16337
First, thank you. This truck was on a trip and the oil pressure gauge went to o customer said engine sounded fine so they drove home with it, about 100 miles. I attempted to check oil pressure just to make sure but you have to have a special adapter to hook on...
2007 Chevrolet Impala LS 3.5L P/S Pump VIN: 2G1WB58K79
Replaced p/s pump approx. 2mos. Ago for being noisey but has assist. 1mo. Later vehicle came back with pump screaming,no assist, and fluid puking out cap.replaced pump under warranty,flushed out system again all was well and proper, sent vehicle home. Agan 1 w...
2001 GMC Yukon XL 1500 Denali 6.0L Misfire, MIL Lamp on VIN: 3GKGK26U91
Hi guys, got a s.o.b. here, this truck will set misfire codes at 70 mph cruise intermittently. the ses light will flash but no misfire is felt. it sets cyl 1 and 6 misfire codes. we changed the fuel pump and filter per customer request with no change. I have s... Trouble codes: P0301, P0306

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Park Avenue Ultra 3.8L Unknown VIN: 1G4CU5210W
Thanks for the input. After checking grounds, which were ok, we installed an ignition switch. All seems to be well after driving the car over the long thanksgiving weekend. Thanks again, another job well done.
1994 Chevrolet Astro CS 4.3L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GNDL15W3R
Sorry all I got alot of good ideas but none of them solved my problem. I am currently waiting on a PROM for the van. But there is an issue on finding one. So thanks to all that tried to help. Trouble codes: 45 (rich exaust).
2003 Chevrolet Malibu 3.1L radio? VIN: 1G1NE52J33
Thanks to all that offered help. Charles [...] had the right fix. Once I read the replys that you sent, I asked the customer if he had any problems with his door locks and he did. The problem was that the drivers door lock would stick, causin...
2003 Chevrolet Silverado 2500 HD LS 6.6L Stall VIN: 3GBKC34F31
we added a relay for lift pump - will run fine after over night start up other disel boards suggested adding relay done will see how it turns out
2003 Chevrolet Malibu 3.1L guages & warning lts VIN: 1G1NE52563
I did swap out a known good ignition switch, and had no change. Customer decided they wouid sell the car as is, and declined any further repairs. I believe with the amount and nature of the water damage it is just a big can of worms to me, and I am happ...
2004 Chevrolet Silverado 2500 HD 6.6L Shift points, and no shifts VIN: 1GCHK23194
This truck is not fixed. We done several alldata flow charts and always came down to nothing wrong, because it was so intermittent. We had it for a week and drove it and it happened once. Replaced Ign switch but didnt help. Going to have customer take back to ...
2004 Chevrolet Trailblazer LS 4.2L Flywheel VIN: 1GNDT13SX4
2007 Chevrolet Silverado 1500 LT 5.3L MIL Lamp on VIN: 2GCEC13077
well,i checked all wiring,grounds-ok.installed wheel bearing and fuel pump,sender assembly which was broken from accident and holding the sender float up-gauge problem.ran vehicle ,no problems.customer has it back and driving also.i think it was a software gli...
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