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Prev Professional Automotive Repair Technical Discussions for March 11, 2009
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Open Help Requests for GM
Help Request Answers
1995 Buick Century Special 3.1L Engine VIN: 1G4AG55M4S
Please any help would be greatly appreciated. We replaced the intake manifold gasket (due to oil leak) and after repairs the engine has a loud ticking noise from one area under the valve cover gasket. We read all the prior posts and determined the gasket we us...
1999 Buick Century Custom 3.1L Poor Idle Quality VIN: 2G4WS52M4X
Good day people. I have this 99 Buick with a 3.1L engine that has a low idle speed. On cold start up the idle is low, approx. 600 RPM. Of course it doesn't want to stay running. You must feather the gas pedal to keep it running. Once warm it will idle by itsel...
2003 Buick LeSabre Limited 3.8L ABS/ TCS lamps VIN: 1G4HR54KX3
this lasabre has a intermitant ABS, TCS lamps coming on issue. they come on and go off at will. everytime I check for DTC's there are no DTC's present. customer brought car in with both lights on and left it running. I scanned with auto enginuity PC based scan...
1985 Cadillac DeVille 4.1L Excessive Emissions VIN: 1G6CD4783F
tested egr valve,valve bad, replaced valve and checked egr solonoid.solonoid tested ok, tee in vaccum gauge and test drove to verify operation. no vaccum reading. checked for codes only e52 pcm reset present. pulled computer to check, had burned spot on circui... Trouble codes: E52 (pcm reset)
1996 Cadillac Seville STS 4.6L charge indicator in dashboard VIN: 1G6KY5299T
Made a mistake looking at the dash board charge indicator was showning 12.02 volt so I installed new alternator. After replaceement of alternator same thing with load charge drop lower @battery. Difference from battery test show good charging but at dash seems...
2005 Cadillac STS 4.6L MIL Lamp on VIN: 1G6DC67A15
looking for some assistance on this problem. is a used car at a local car true history on any previous repairs...we've gone thru test and can find no reason that problem comes drivability problems are present at all...problem is so intermit... Trouble codes: P1101 (actual measured airflow from mafmapegrtp is not within range), P0068 (map/maf throttle position correlation)
1988 Chevrolet Corvette 35th Anniversary Edition 5.7L Poor Idle Quality, Surge VIN: 1G1YY2183J
Hey all, have a tuned port 5.7 corvette. Has a rough idle after closed loop kicks in. Doesnt run too bad in open loop but not smooth. Will run good in back up spark and fuel mode. Block learn and integrator indicates a rich condition. Plugs are turning black. ...
1994 Chevrolet S10 4.3L Clutch Master Cylinder VIN: T19Z7R8208
I'm at the point where I am ready to scream. Customer came in for a typical motor replacement, replaced everything as usual including clutch and clutch hydraulics. Very last item to replace was the clutch master cylinder. From G.M., part number [...] the re...
1999 Chevrolet Venture 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDXO3E9X
Thanks to all that take the time to help. I have a big problem that i just cannot figure out. I have this van that came from the dealer. The dealer replaced the crank sensor that mounts on the frt of the crankshaft, it did not fix the problem, so they recom th... Trouble codes: P336, P341
2000 Chevrolet S10 2.2L Misfire, MIL Lamp on VIN: 1GCCS195XY
Hello, I have this little truck here that has been to a couple of different shops locally and now to me, when first started it runs o.k. for a few seconds then starts missing on #4 cylinder. Checked compression, has 125 cranking compression across the board, f... Trouble codes: P0300, P0304
2002 Chevrolet Trailblazer LS 4.2L no communication VIN: 1GNDT13S62
This t- blazer came in with the radio light going off and all cluster lights coming on at start up. The rear lift gate solenoid would also chatter when the gate was opened. We found no communication with the lift gate module and multiple communication codes u1... Trouble codes: U1000, U1016, U1088, U1301, U1305, U1064
2003 Chevrolet Tahoe LT 5.3L Cuts out, Misfire, MIL Lamp on VIN: 1GNEK13Z43
This Tahoe came in and the customer ststed that the check engine light comes on while driving, engine misfires and check engine light flashes. No big deal, should be an easy misfire correction. I took the vehicle out and sure enough it happened. What I noticed... Trouble codes: P0154 (ho2b2s1 insufficient activity), P0157 (ho2b2s2 circuit low voltage), P0300 (random misfire)
2005 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEK13T45
Hello Fellow Tech's. This is My First Time Asking for Help on iATN so Forgive Me if I do not do everthing write.The Problem is this, The Customer complant is when they fill the vehicle to top with gas it is very hard to crank. So the customer took to nearest d...
1995 GMC C6000 Topkick C6H042 6.0L Poor Idle Quality, Cuts out, Poor Fuel Economy VIN: 1GDJ6H1P9S
hey everyony i just changed jobs and inherited this problem this is a water truck that has only one injector pulsing i am not sure which side was the one that at the beginning for i was told that the wires were swapped to see if it was injector or wiring now o...
1989 Pontiac Grand Prix 3.1L Hesitation VIN: 1G25768787
Vin wrong I dont have it at this time. Car came in with hesitation at 1/4 thru full throttle falls flat on its face. Ran fuel pressure test 38 psi and scann codes. Tps locked at 1.54v no sweep disconnected battery Tps voltage good and sweep test good but hesit...
1997 Pontiac Grand Prix GT 3.8L No Start VIN: 1G2WP12K8V
I am working with a 1997 Pontiac Grand Prix with a 3.8N/A engine. Currently it is a no start. Car was brought to me because it would die while idling and stall sometimes. So I have checked for spark, fuel pressure, and injector pulse. I only have spark, and it...
2000 Pontiac Grand Am SE 3.4L Misfire VIN: 1G2NG12E8Y
I need some help here fellas. 2000 Grand Am 3.4 misfires and bucks at 72+ mph. While driving on interstate this vehicle will run great until you reach 72+mph and let off slightly. At that point it begins to misfire and buck, scan data shows misfires across the... Trouble codes: P0336, P0300
2002 Pontiac Grand Am SE1 2.2L No Start VIN: 1G2NF52F12
This vehicle came in with a crank no start issue, the fuel pump and strainer were replaced, everything was fine car started normally sat outside for a day then wouldnt start. wiggling on the ignition control module connector while cranking the engine would sta...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Cadillac DeVille 4.6L Misfire, MIL Lamp on VIN: 1G6KD57YX2
Thanks to ALL of your help with this one... After all of the parts we put on this car for nothing, It ended up being a simple Crank sensor relearn... I should know better by now to look here first... Trouble codes: P0300 (random misfire).
1989 Chevrolet Corvette 5.7L headlamp circuit, high beam side VIN: 1G1YY2184K
Turns out a bad ground on the foglamp side. Headlamps and foglamps share the common ground G115/G116 at the front frame. I originally tested with a new test ground wire at this location and it had no effect. Plus, the wires and ground looked perfect and show...
1995 Chevrolet Camaro Z28 5.7L temp VIN: 2G1FP22P9S
Well this on got our goat, I hate to say just what was wrong, it was a bad thermostat, my teck even had it out in his hand and reinstalled the orginial one, just did not make sense to us how only the temp in cylinder heads was hot, but this is a reverce coolin...
1996 Chevrolet Lumina 3.1L Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 2G1WL52M8T
Bad news 90lbs of compression on #6... customer may not decide to go any further thanks for the help Trouble codes: P0306 (6 misfire).
1999 Chevrolet Malibu LS 3.1L bcm VIN: 1G1NE52M4X
Well after taking this car apart! It turned out the short was in the radio. Thanks to everyone that offered help!
2001 Chevrolet Impala LS 3.8L Security light on VIN: 2G1WH55K11
Thanks for all the help! It was Michael's suggestion to check/replace the Passlock 3 wire connector that led me to this fix. I used Kerry's thoughts that the the system was getting the wrong voltage from the Passlock sensor so that is what I watched on the s... Trouble codes: B2960 (Security data wrong but valid).
2005 Chevrolet Equinox LT 3.4L Extended Crank VIN: 2CNDL73F25
we did a fuel system cleaning on the vehicle and we have had no problems since. Trouble codes: P1626 (Anti-Theft Enabled), B1327 (Power ne Circuit Low).
1997 Pontiac Grand Am SE 2.4L theft VIN: 1G2NE52T2V
Mike [...] gave the most helpfull insite, as he said "Passlock 1, 2 do not require specific OEM keys. The sensor is a hall effect switch mounted in the lock cylinder housing with a magnet in the lock cylinder. As long as the cylinder is rotated(with anythin...
1999 Pontiac Bonneville SE 3.8L dome lights VIN: 1G2HX52K8X
Thanks to all who replied. I have not been able to get the vehicle back in the shop yet, but I have made arrangements to use a tech 2 to diagnose the problem. This will be a huge time saver. Thanks again for your help. Herb
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