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Prev Professional Automotive Repair Technical Discussions for March 24, 2015
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Open Help Requests for GM
Help Request Answers
2008 Buick Enclave CXL 3.6L No Start, MIL Lamp on, no crank VIN: 5GAER23778
Help GM techs! This enclave came in with the typical throttle body related faults and a complaint of a no start condition- we found throttle plate was not binding so we PROPERLY serviced the throttle body (no spray) and re leaned the basic throttle position. V... Trouble codes: P2176
1999 Chevrolet Express 2500 5.7L turn signals VIN: 1GCGG25R2X
When i turn on the parking lights the turn signals stop working, with parking lights off turn signals blinks fast on both sides with left or right turn signal on. grounds good checked with headlamp.removed all bulbs and both turn indicators light up on dash an...
2000 Chevrolet Blazer LS 4.3L Fuel trim VIN: 1GNDT13W2Y
Car starts up runs fine indefinitely if just idling. When brought up to cruise starts surging and fuel trim start going negative very repeatedly. Then when the throttle is released it dies. Will start again after long crank and will idle badly. Fuel trims are ...
2003 Chevrolet Avalanche 1500 North Face 5.3L transfer case VIN: 3GNEK13T93
Ok guys, I could really use some help on this one. Truck came in for growling noise while driving. Discovered truck was stuck in 4H and had the infamous hole in the t-case. Encoder motor had corroded between the case and motor enough to push it out and crack t...
2003 Chevrolet Venture LS 3.4L fuel VIN: 1GNDX03E93
Thanks in advanced for any input i get on this vehicle. The problem with this van is if i let it sit for a couple of hours will not start unless i spray some carb cleaner then it will start as many times as i want as long as it dont sit for hours. i have tried...
2008 Chevrolet Silverado 1500 WT 5.3L Unknown VIN: 1GCEK19018
This truck has a harsh 1-2 shift. All other shifts are beautiful. There are no transmission codes, the highest adaptive value was 5.2 and the fluid is in excellent condition with no indications of any concerns. We decided it had to be a broken 1-2 accumulator ...
2009 Chevrolet Express 3500 6.6L Charging VIN: 1GBJG31629
Hi guys need help.truck towed in for alternator not charging.charge the battery.this is ambulance truck. Dual alternator.verify alternator not charging.put scope on primary alternator gray wire -f terminal i have 8 volt square waves and l terminal has 8 volts ...
1999 Pontiac Montana 3.4L camshaft VIN: 1GMDX03E6X
replaced camshaft & bearings crankshaft oil pump timing chain head gaskets 12,000 miles ago because cam broke now has broke again aftermarket parts what do i look for on why
2007 Saturn Outlook XE 3.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 5GZEV13767
Need some feed back on this one. Not very familiar with Saturn. Wondering if any one has run into this before? Thinking perhaps timing chain problem. Hard to start, misfire, rattle noise from engine, all intermittently. Shows misfire worse on #1. Seems to lac... Trouble codes: P0016 (CKP-CMP Correlation), P0017 (CKP to exhaust CMP Correlation B1), P0018 (CKP to intake CMP Correlation B2), P0106 (Map or Baro pressure circuit out of range), P0300 (Engine Misfire detected)
2008 Saturn Outlook XE 3.6L Converter Lock VIN: 5GZER13728
we have done several of these units over the past few years with no issue - however this one and one other unit we overhauled did developed a converter shutter or vibration when the converter is under partial lock and the transmission is hot. On the first un...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick LeSabre Limited 3.8L No Start, Stall VIN: 1G4HR54C6K
As we said in the update, spark died. Got some good info from AutoLine, to see if the PCM or ICM was bad. First, unplug the PCM totally. If spark now, PCM is the culprit. A second check of PCM is see if you got 5v on the purple/white reference line. KOEO, gr...
2000 Chevrolet Silverado 1500 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire VIN: 1GCEC14WXY
Thanks to all who responded. Although it may be a band aid fix, I slotted the distributor which gave me 0* cam retard. This morning it fired right up and ran extremely well. No detonation, misfire, or hesitation. Again, thanks for all the help...
2011 Chevrolet Equinox LTZ 3.0L Hesitation, Surge, MIL Lamp on VIN: 2CNFLGE5XB
well i replaced the primary fuel pump and that fixed my problem. Alot of sedement build up on sock,not sure what it was but it almost look like a fine brown powder, nothing in the tank itself.Thanks again for the input guys it put me back on track. Trouble codes: P018B, P2635.
2013 GMC Sierra 2500 HD SLT 6.6L MIL Lamp on VIN: 1GT020C87D
thank you ralph, resetting the reductant system and nox sensors is what got this, i also had to run the exhaust fluid quality test twice and took vehicle for a road test not even 5 minutes down the road the exhaust fluid light went out, customer stopped back i... Trouble codes: P204B.
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