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Prev Professional Automotive Repair Technical Discussions for February 9, 2009
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1988 Buick Century Custom 2.5L No Start VIN: 1G4AH51R8J
This vehicle will not start cranks fine. I have a good injector pulse but no spark. Have replaced the ing mod three time and the computer twice to no avail. It would run until it would get warm then cut off. After it would cool down it would restart. Until Fri...
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1991 Buick LeSabre 3.8L Hesitation, Surge, MIL Lamp on, code 41 VIN: 1G4HP54CMH
This is a hair puller.This car was previously diagnosed at another shop. Check engine light on always, code 41,cam sensor circut problem. Customer requested to verify diagnosis that cam sensor magnet was missing. Removed cam sensor and confirmed magnet was com... Trouble codes: 41 (cam signal circut problem)
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1996 Cadillac DeVille 4.6L extended crank times VIN: 1G6KD52Y1T
Car came in with a no start/no crank condition. Diagnosed broken wire in VATS system at ign lock cyl, replaced ign lock cyl. Cranks and starts, but when cold, has extended crank times. Customer confirmed that vehicle had extended crank times before VATS wire ...
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1990 Chevrolet G20 Sportvan 5.7L timing VIN: 2GBEG25K9L
I have a van with no dist. rotating or valve movement and of course no compression.Is there a easy way to check if the chain broke or could it be a cam broke. Any help in the right direction would be really nice.Thank you
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1996 Chevrolet S10 2.2L Poor Idle Quality
did a compression test. 150 every cly. has only 10 inches of vacuum at idle. 18 at higher rpms. I suspect valve timing. I think it jump.
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1999 Chevrolet Venture 3.4L Engine VIN: 1GNDX03E1X
My question is aimed at you GM techs.I am trying to figure the best way to R&R the engine.Top or bottom.I never changed one in a venture.Seen one come out the top, but which way are you flat rate guys doing it.I thank you in advance for any input.IATN is the b...
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1999 Chevrolet Cavalier 2.2L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 3G1JC5248X
Hello.I have a 1999 cavalier that isn't running the best,the cat has good spark,running and starting.fuel system is within spec.has 17 inches of vacuum at idle,and has no codes stored in the ecm.data while scanning looks to be all normal.The car will die if th...
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1999 Chevrolet Silverado 1500 5.3L Poor Idle Quality, HARD START VIN: 1GCEK14T7X
hello, this truck will start up perfectly on the 1st start of the day,if you let it run 10-15 minutes than shut it off and let it sit for 10-15 minutes it will crank over about 6 or 7 seconds before restarting and than has a low idle and a little rough idle. ...
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2001 Chevrolet Express 3500 6.5L Cuts out, Injection Timing VIN: 1GCHG39FX1
Need some Help, I replaced the Injection pump due to Engine ShutOff Solenoid was open. Installed new pump, Runs fine till [...] coolant temp, computer tries to control timing and it cuts out. Scanned, TDC is +2.46 deg (maxed out) Inj Timing at 0 The pump...
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2002 Chevrolet Silverado 2500 HD 6.6L Mechanical VIN: 1GCHK29192
To my duramax diesel mechanics. I am replacing a notorious leaking fuel injector and I'm thinking it would be a good time to adjust the valves. I can't find any where in Mitchell as to when the valves are to be adjusted. Could anyone enlighten me on the subjec...
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2006 Chevrolet Malibu Maxx LTZ 3.5L No Start VIN: 1G1ZU63846
This car came to me after spending 21days at GM dealer-customer lost confidence in the dealer. I have spent 4days on it myself. Car came to me with U-codes for SDM, Rear dvd player and digital radio receiver. I found two cut low speed data lines behind blue wi... Trouble codes: B0331 (Security system controller in learn mode), B0355 (No transponder modulation or no transponder)
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1995 Geo Prizm 1.6L Misfire VIN: 1Y1SK52561
please help : we cant figure this out #2 cylinder miss when it wants to only after warming up / we know injector is good so is injector pulse - weve tried all the basic tune up parts - cap - rotor - plugs & wires still does it - moved fuel injectors just to se...
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2003 GMC Yukon Denali 6.0L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GKEK63UX3
2003 Denali has repeat codes of P0101 (MAF Sensor), P0171 and P0174 (right and left bank too lean). Previous repair history: MAF sensor checks out ok, throttle body was cleaned, PCV was replaced, and fuel filter was replaced. After performing work the light ... Trouble codes: P0101, P0171, P0174
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1999 Oldsmobile Intrigue GL 3.5L Heater control VIN: 1G3WS52H4X
I have a digital heater control ,that does not light up,or work at all. Intermitent,comes on + works fine. The problem is when I get it ,it normally works .Twice it was out + comes on,to quickly to test. + stays working. I installed a used control unit from a ...
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1999 Oldsmobile Alero GL 2.4L No Start VIN: 1G3NL52T8X
Hello techs. I hope someone can help me. I have this olds alero with the 2.4 engine that has an intermittent no start. The only codes was a p0507 that has not returned since being cleared. When the problem happens there is no injector pulse & i think it's miss... Trouble codes: P0507
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Fixes & Summaries for GM
Fix/Summary Answers
1995 Cadillac Eldorado ETC 4.6L Stall VIN: 1G6ET129XS
Thanks to all that took the time to respond. I did make one mistake on the post, the code was P095. Is this a fix? I hope so. When checking for bad fuel pumps, I normaly use a test lite to verify current after finding no fuel pressure. For what ever reason, I ... Trouble codes: P0117 (Stall or near stall).
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1993 Chevrolet K1500 Cheyenne 4.3L hard 1-2 shift VIN: 1GCEK14ZXP
As for the responses just click on "replies." The fix ended up being the EPC solenoid. Even though the ohms were in spec. (1.5 to 3.6) the solenoid was actually sticking somewhat causing high line pressure and hard shift. Just goes to show ohm testing will ...
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1999 Chevrolet Tahoe 5.7L Mechanical VIN: 3687779797
Thankyou gentlemen, we decided to replace the head, we did drill it out with no success. Thanks again.
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1999 Chevrolet K1500 LS 5.7L lock-up convertor VIN: 1GCEK19R9X
LAST MONDAY WE INSTALLED A REMAN CONVERTOR. WHEN MY TECH GOT BACK FROM HIS TEST DRIVE HE ASKED ME IF IT SHUDDERED BETWEEN 50 AND 60 MPH, I SAID YES IT DID. HE SAID IT STILL SHUDDERED. SO WE PULLED THE TRANS AGAIN AND TORE IT DOWN AND INSPECTED EVERY INCH ...
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2002 Chevrolet Astro LS 4.3L Excessive ststic in radio VIN: 1GNDM19X72
Thanks to all who helped! Suggestions went from noisy new NAPA wires to a Capacitor/Filter at primary feed to ign coil to unplugging alternator. Then to changing the antenna location. Making a loop stick and sniffing around the van for the loudest noise, ev...
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2003 Chevrolet Astro 4.3L low power VIN: 1GNEL19XX3
Thank you all for your help. And yes, it was the CAT. The worst part was removing the cross-member for the front torsion bar suspension, ie, (this van was from snow/salt/corrosion state- MI) Most or all of the bolts were rusty/corroded, but we got it done. ... Trouble codes: P0101.
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2004 Chevrolet Silverado 1500 4.8L speed cluster VIN: 2GCEC19T84
the customer was close to home so i gathered info from all yuall and sent them to dealership.thanks evryone you all hit the nail on the head with the info, yours always truly leo [...],the top shop
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2004 Chevrolet Cavalier 2.2L Excessive Emissions, Poor Idle Quality, Misfire, Flooding VIN: 1G1JC52F54
Thanks to all who replied, pulled valve cover, found large amount of sludge, vehicle apperantly was not maintianed well. Led us to examine timing components, found timing chain off by one tooth between cams, replace chain, guides & tensioner, clean oil passage... Trouble codes: P0300, P0171.
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2005 Chevrolet Silverado 2500 HD 6.6L speedometer VIN: 1GCHK23285
Hello thank you for the replies it turned out there was a bad wire behind ipc. Customer brought it to dealer for the ipc and it did not fix it turned out wire was broken behind the dash somewhere. Thank you for all your help again it turns out there is an exte...
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