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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 19, 2014
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Open Help Requests for GM
Help Request Answers
1996 Chevrolet Impala SS 5.7L Misfire, MIL Lamp on VIN: 1G1BL52P2T
i need help on this one. this impala was brought to me from another shop, where motor and trans were rebuilt also had a compleat tune up with above repairs. car came in with 8 codes in memory four were for ox sensors no activity lean exhaust and heater codes b... Trouble codes: P0300
2004 Chevrolet Malibu LS 3.5L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1ZT54854
thanks in advance.car came in w/random missfire code, missing on cyls 1 & 3 mostly some misses showing on other cyls but very little figured this was due to major skips on 1&3.cust had installed new plugs & wires,chkd firing order ,ok.swapped plugs & wires aro... Trouble codes: P0300
2004 Chevrolet Silverado 1500 5.3L Hydraulics VIN: 1GCEK19T34
Customer brought vehicle in for spring maint. we noticed brake pedal was very low,he said "Been like that a long time" we said "we'll take a look". Power bleed,automated bleed,still low. Blocked off front brakes pedal feels moderately better. Replaced pads,rot...
2004 Chevrolet Trailblazer LS 4.2L 4x4 operation VIN: 1GNDT13S14
Vehicle came in initially stuck in 4 Hi & had lots of transfer case codes stored - found someone had replaced the encoder motor and used butt connectors that were not weather tight - all wires were green and would break off when touched - moisture had wicked a...
2005 Chevrolet Trailblazer LT 4.2L door locks, power windows, no start, radio rear wi VIN: 1GNES16M85
Need some help with this one. VIN decoded as a 6cyl but it is a 5.3l v8 truck. customer lost drivers door switches approx 6 months ago but it still ran fine and everything worked from the other doors. Now towed in as a no start. Vehicle will not turn over and ...
2003 Pontiac Montana 3.4L Poor Idle Quality, High Idle VIN: 1GMDX03E63
Can not figure this one out. Idles high 1500-2000. Can get to idle down 900. As soon as it goes into gear idle jumps up again. Replaced IAC, Replaced bad PCV hose on throttle body, cleaned MASS Air Flow. Replaced IAC With different vendor. IAC reads correct. J...
2006 Saturn Relay-3 3.5L Cuts out, MIL Lamp on VIN: 5GZDV23136
Sensor is no good.Need to know the best way to remove this crank sensor. Looks like I will have to remove the back exhaust manifold. Trouble codes: P0336 (Crank sensor)

Fixes & Summaries for GM
Fix/Summary Answers
2009 Buick Lucerne CX 3.9L No Start
Thanks to all that replied special thanks to jeff for outlining some tests for me which led me back to pump drawing to much fuel pressure was spot on koeo 58 psi and koer 61 psi another fuel pump was not available for a couple days customer decided to take car...
2006 Chevrolet Silverado 1500 WT 5.3L transfer case control VIN: 1GCEK19B66
We replaced the encoder motor position sensor. Vehicle gone a week so far no more problems.
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