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Prev Professional Automotive Repair Technical Discussions for February 11, 2015
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Open Help Requests for GM
Help Request Answers
2008 Buick LaCrosse CXL 3.8L battery VIN: 2G4WD58258
Well here goes, vehicle came in for dead battery after sitting for approx. 5 days. vehicle has current draw of approx. 170ma. what is strange,is it pulses like a heartbeat from approx. 114 to 200 ma. consistently. Have pulled all fuses,relays, and ckt. breaker...
1997 Chevrolet Express 1500 5.7L No Start VIN: 1GBFG15R0V
Van came to shop with a no start condition after the van had been sitting for a few years. We first checked fuses and found the ECM1 fuse blown. We then checked fuel pressure, and spark. Fuel pressure is good- 58 psi with KOEO, 62psi while cranking. Spark- goo...
2012 Chevrolet Silverado 1500 LTZ 5.3L 6-5-3 downshift VIN: 3GCPKTE71C
got a downshift issue. if you gas on it say 45 to 70mph it downshifts and TM takes over and the rpm's drop the transmission locks up as it downshifts and the rear tires will squeal if over 60mph and then it shifts and launches and does fine. It has done this f...
2013 Chevrolet Silverado 1500 LTZ 5.3L MIL Lamp on VIN: 3GCPKTE79D
I have this pesky problem on this 5.3 V8 Silverado. It keeps coming back with this P0128 and will not reach operating temperature as far as I am concerned. It will pass the code test after thermostat replacement - but barely. I did not see anything wrong with ... Trouble codes: P0128 (eng wont reach operating temperature)
2008 Saturn Astra XR 1.8L MIL Lamp on VIN: W08AT27158
ECM monitors the MAF sensor signal and if not within the specified range/model thats stored it triggers the DTC and it has to be in open loop. Understanding the systems just needing some input of where to go now. Trouble codes: P1101 (Intake air flow system performance)

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52KXW
customer had a dorman kit installed for upper intake leaking was not installed properly coolant was getting in to exhaust and contaminting o2 sensor
1997 Chevrolet K3500 Cheyenne 5.7L Poor Idle Quality, Misfire VIN: 1GCHK34R7V
Hello everyone and thank you for all the good helpful hints. What I ended up doing was cleaning the injectors with the motor vac and doing a combustion cleaning. my fuel trims dropped back down where they belong and the truck runs smooth. Thank you for your ... Trouble codes: P0174.
1997 Chevrolet Blazer 4.3L abs
We did replace the master cylinder, and rebled the entire system, including the ABS auto bleed. Brakes are now good, no pulling, no fading, no soft pedal. Thanks all for the help/info!
2005 Chevrolet Avalanche 1500 LT 5.3L Excessive Emissions VIN: 3GNEK12Z35
Wow I dont post often but you guys are awesome.Thanks Jason,Don,Robert and Gordon.You guys hit it on the head even though I could ground vent solenoid at pcm connector and make it work running a new wire enabled the pcm to control solenoid.Im sorry I did not t... Trouble codes: P0449 (Evap vent control solenoid circuit).
2007 Chevrolet Express 3500 6.0L p/s pump VIN: 1GCHG35UX7
Thanks to the five that replied. a longer belt was not available. A new oem pulley was the spoke design. instead of solid. installed new oem pulley and advised customer. thanks again. Bob
2007 Chevrolet Silverado 1500 LTZ 5.3L right front end sensor VIN: 1GCEK19027
The customer left with the vehicle after the post. I was unable to check under the driver seat or replace the sensor. He is an older man that doesn't go out a lot in winter. I am told I need to close this. Sorry I was unable to post a repair. Thank You for...
2010 Chevrolet Malibu LT 2.4L Flooded on starting VIN: 1G1ZC5EB9A
Thanks for all the response to this problem, and we finally got it repaired. Although we tested the Purge Valve with the Scan Tool, we removed it and bench tested it. We could then see it was not closing completely. Replaced it and the vehicle started and ran ... Trouble codes: P0172.
1984 Pontiac Fiero 2.5L Fuel Tank VIN: 1G2AM37R5E
First off thanks for all the replies. We followed up on all of them. Shipping was the biggest issue. We found one on and had it picked up down country! Gas tank will likely be worth more than the whole car! Thanks again, Mat
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