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Prev Professional Automotive Repair Technical Discussions for April 17, 2012
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Open Help Requests for GM
Help Request Answers
1988 Chevrolet V10 Suburban Silverado 5.7L Stall VIN: 1GNEV16KXJ
will stall in the shop at idle in park, disconnect est connector will stay running, hook up scan tool watch idle control motor counts, at 30 counts disconnect motor will stay running. with everything hooked up and scanner connected watch iac counts go to 0 and...
1994 Chevrolet Caprice Classic 5.7L failsafe erratic dtcs VIN: 1G1BL82P5R
vehicle was brought in operating in failsafe with codes 84 3-2 downshift sol feed back fault, 34 map sensor signal low code 83 tc quad driver module fault. after finding high resistance on the 3-2 ds sol. we checked the wiring from the pcm to the trans and eve...
2006 Chevrolet HHR LS 2.2L Poor Idle Quality, Surge, Misfire VIN: 3GNDA13D66
Vehicle came in customer stated car was hard to start and runs rough intermittent. This morning it ran rough it had code p0300. It was racking up missfires on cylinders 2 and 3. We replaced the ignition module and it still ran rough. We have also replaced the ... Trouble codes: P0300
1990 GMC Safari 4.3L Stall VIN: 1GTCM15Z8L
Vehicle came in as a no start i diagnosed bad distributor. Replaced Distributor with some WPS brand even though i asked for an OE distributor but according to my service writer OE distributors are no longer available. In the process of setting timing the start...
1998 GMC K1500 Sierra SL 5.7L No Start VIN: 2GTEK19R8W
Thank you in advance for your help. Vehicle came in for an engine, ran at that time. Installed engine and would not start. Has spark, will jump a 30kv gap, fuel pressure is 60psi cranking. Can start vehicle with brake clean and run. Has injector pulse, can pul...
2003 Hummer H2 6.0L Ride Control VIN: 5GRGN23U73
Hummer came in with Sevice Air Suspension Light On. Code c0711. Pressure Valve. Went though tests and determined it needed a Compressor assembly.Bought new Compressor without Controller.Installed assembly. I can communicate with module for codes,but will not a...
2002 Pontiac Firebird 3.8L MIL Lamp on VIN: 1GC2MERUS2
vehicle came from another shop, with both not enough cross counts codes, bank 1 and bank 2. O2 sensors are responding fast based on testing, MAF has been swapped with known goog one, no change, im leaning twards not enough fuel volumen at cruise, fuel pressure... Trouble codes: P1133, P1154
2005 Pontiac Grand Prix 3.8L Steering VIN: 2G2WP52235
This car is beyond killing me. Power steering issues. Non stop Nite mare. 1st in installed aftermkt p/steer pump for leak. That came back with a shaft wobbling and broken, fluid lost. Installed 2nd after mkt pump and this time did rack and pressure hose for mo...
2007 Saturn Ion-2 2.2L Electric Steering Assist VIN: 1G8AJ55F47
Good morning everyone, this Saturn after about 4 miles of driving the power steering shuts down, I have tried to get a code with my scanner but no codes set while in this condition, what am I missing. Thanks in advance

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Century Special 3.3L Ecm VIN: 1G4AG54N0M
First of all thanks for the replies and especially to Todd who was kind enough to E mail me a diagram and Mike who was going to mail me one. OK ill give a better review here: Car was towed in with customer replaced fuel pump, pressure regulator, ignition modul...
1996 Chevrolet K2500 Cheyenne 5.7L Stall VIN: 1GCGK29R8T
Due to the intermittent nature of this problem it took quite some time to isolate the problem. I found that it had to sit several hours before the problem might occur, and if it didn't happen in the first 10 minutes of running, it wasn't going to stall. So, I ...
2000 Chevrolet C3500 7.4L Poor Idle Quality, Misfire VIN: 1GBKC34J0Y
thanks to all who replied. I took a fuel volume test and had good volume, however the bottle in which i dumped the fuel into contained mostly water in it after the test. Gas tank was mostly full of water. drained front tank and checked rear tank. All is good!
2010 GMC Sierra 2500 HD SLE 6.0L No Start, Cuts out VIN: 1GT4K0BG9A
Thanks to all who replied, I had a new PCM installed and programmed at local GM dealer and problem is gone. They also warned me that a trailer brake control module can cause the same problem. 100% for timely and acurate fix info IATN Trouble codes: P0601 (Read only memory failure).
2001 Saturn SL 1.9L Poor Idle Quality, MIL Lamp on VIN: 1G8ZF52891
Hi everyone; thanks for all the input. I pressurized the system from the gas tank filler and still no leaks. So, I just went ahead and replaced the vent valve. Evap monitor has ran, no leaks found. The customer has had not complaints since. Trouble codes: P0442 (Evap Small Leak Detected), P1599 (Engine Stall / Near Stall Detected).
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