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Prev Professional Automotive Repair Technical Discussions for June 15, 2004
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Open Help Requests for GM
Help Request Answers
1996 Buick Park Avenue 3.8L sluggish VIN: 1G4AC52K8T
Hello everyone. I need help fixing my NAPA salesmans car. The car is sluggish under light acceleration, but runs well under heavy throttle. The problem is more noticable in hotter weather. A Motovac salesman was cleaning the fuel injectors and found low fuel ...
1999 Buick Park Avenue 3.8L No Start, Misfire, false scanner data? VIN: 1G4CW52K4X
we scanned tested system. found code po300 (random misfire). found #2 and #5 cylinders not firing. Cylinders had spark and noid. Then those problems went away. Let sit overnight and restarted in am and vehicle would not start. Scanner read ect at -40 degrees. ... Trouble codes: P0300
1993 Cadillac Seville 4.6L Excessive Emissions
Problem is constant.While i bring this monster inside garage all staff disperse because of blue smog and full-flavoured gas. No codes, injector's pulses are OK - approx. 2.5 msec. Injectors aren't leaking.I didn't put gas analyzer inside tailpipe because i'm s...
1994 Cadillac DeVille 4.9L Cuts out, MIL Lamp on VIN: 1G6KD52B8R
I have a 94 Deville with a P041 (No cam sensor signal) code and a Service engine light on. The Diagnostic tree leads me into Voltage between pins D&E Greater than 2.6 volts running (actual is 13.49V.) It says now to check short to voltage CKT 630. How do I kno... Trouble codes: P0041
1997 Cadillac Seville SLS 4.6L loss of coolant VIN: 1G6KS52Y0V
Original complaint was lossof coolant from overflow. After compression check was good we replace intake & thermostat. We also flushed radiator. this is when we started having the temp gauge shoot up when running 70+mph. It may have been doing before unnoticed....
1992 Chevrolet Lumina 3.1L No Start VIN: 2G1WL54T3L
Hello Guys! Got this 92 Lumina towed in no start. Found severely flooded. Checked pressure regulator found ok. Check injector plugs with KOEO found to be firing at all times. (Noid light stays lit) Unpluged ECM light goes out. Replaced ECM twice. No change. An...
1994 Chevrolet K3500 Cheyenne 6.5L Poor Idle Quality, Surge, Misfire VIN: 1GCHK33F2R
After the heads were replaced the truck starts and runs ok except on a cold start it runs rough and smokes white until it warms up for several minutes, then it runs ok until it cools off. Scan data is ok including timing offset, unplugging coolant temp. sensor...
1994 Chevrolet Camaro Z28 5.7L Poor Idle Quality, Surge VIN: 2GIFP22PXR
hello friends, have this trouble, after engine warms, idle surges very high, upto 2,000 rpm, if vehicle is in gear it really tries to take off. there are no trouble codes, pcm if commanding i.a.c. high. i have jiggle test harness for poor connections, have che...
1997 Chevrolet K1500 Cheyenne 5.7L Steering Effort VIN: 2GCEK19R7V
Customer Brought In For Intermittant Increase In Steering Effort, Like Its Binding Intermittantly, Replaced Gear Box And Pitman And It Got Better He Said, But Still Not Right, Replace Flow Control Valve With Aftermarket And GM Wtih No Improvement, He Says Its ...
1999 Chevrolet Blazer 4.3L Surge, Cuts out, MIL Lamp on VIN: 1GNDT13W1X
Hey Guys (&Gals) Gotta pick your collective brains. Above vehicle has sevear hesitation only in drive. When this occurs the reference voltage to the TPS, as well as EGR, Fuel Tank Preshure Sensor etc drops to 1 volt or below. This will only occur in Drive,3,2,... Trouble codes: P0122 (tps voltage low), P1122 (tps voltage low)
2001 Chevrolet Silverado 2500 HD 6.6L four wheel drive,front end VIN: 1GCHK29111
when driving foward and then stopping ,then proceding to reverse and turning the wheel all left ,while backing up the front end makes a loud click that sounds as if the axles are tring to connect at the solonoid aera.the truck has all high way miles and is use...
2002 Chevrolet Trailblazer LS 4.2L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1GNDS13S92
Good afternoon. Customer had vehicle towed in with a check engine light on and stalling. Vehicle also has reduced engine power light on. The vehicle doesn't have a MAF but a MAP. The flow chart in All Data is of no help. I am also using my snap on modis with g... Trouble codes: P1514 (MAF air flow out of range)
2002 Chevrolet Silverado 2500 HD 6.6L Fuel guage reading VIN: 1GTHK24151
Hi All: Have this 2002 Chev. Duramax Diesel P/U with a fuel guage reading that fluctuates rapidly from full to empty sporadically and blinks the low fuel light rapidly. Checked the fuel level reading on the scanner and it also will increase from the base value...
1999 Pontiac Grand Am SE 3.4L high idle VIN: 1G2NE52E6X
this veh. has a VERY intermittant high idle problem , it only occour after a long drive . while climbing hills around here (approx. 3000ft.) it is fine but when decending hills veh will not slow down , when customer puts it into neutral it races to 3000 rpm. n...
2001 Pontiac Grand Prix GT 3.8L Wheel Speed Sensor VIN: 1G2WP12K51
Good morning folks. This car came in with the ABS light and the Trac Off lights on. When I test drove it, both lights were off, but came on at the first stop. The pedal pulsed under my feet, figured ABS cycling. Checked codes, has (in order) 37 and 40 current,...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Regal Custom 3.8L Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 2G4WB54L1P
Thanks to all that responded. While scoping cam/crank signals at ECM, problem cleared up, engine light went out, and vehicle ran decent. Apparently we had a bad connection in the ECM plug on the IC terminal. Vehicle did still run with a slight miss, had to rep... Trouble codes: 18 (cam/crank error).
1996 Buick Skylark Custom 3.1L MIL Lamp on VIN: 1G4NJ52M6T
Thanks to all who took time to read my cry for help,And the 4 who answered with great advise, I had already looked in the archives looking for an answer but stoped to soon. The drive cycle for the EGR was thare but I never found it until one of those who ans... Trouble codes: P0401.
1998 Buick LeSabre Custom 3.8L No Start, dumping fuel VIN: 1G4HP52K8W
upper intake leaking water at egr ,upper intake was eaten away where egr pipe goes in , pulled lower intake and replaced those gaskets as well . spark plugs looked wet with gas but was water. all the water was setting in the upper intake and none in the lower ...
1998 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1G4HP52K4W
Hi guys, I would like to thank everyone who sent me a reply. I ended up testing the 'drag' on the maxi-fuse terminals. I found the PCM/VATS terminals had less drag that others, so I backed-out the terminals & 'tweeked' them alittle tighter. I also cleaned the ... Trouble codes: P0107 (MAP sensor low voltage), P0122 (TP sesnor low voltage), P0452 (Fuel tank pressure sensor performance), P1107 (MAP interrmittent low voltage), P1122 (TP sensor interrmittent low voltage), P1635 (5 volt reference line).
1986 Cadillac Fleetwood Brougham 5.0L Excessive Emissions VIN: 1G6DW69Y5G
Please read the responces. Great info on this system. With your inputs, here is what I did. Found air switching valve (not deverter) stuck in manifold possition (should be in cat possition in closed loop). Disconnect hose from converter at switching valve. Lot...
1992 Cadillac DeVille 4.9L compressor VIN: 1G6CD13B7N
thanks alot guys. Went back and checked Ac relay and it was staying open. Replaced the relay and all is well. thanks again!
1993 Chevrolet Lumina APV 3.1L Stall VIN: 1GNDU06D4P
Thanks to Jeff from Iowa, Richard from Manitoba, Todd from Ohio, Tom from Missouri, Mike from Oregon, Doug from Ohio, Terry from Illinois, Keith from Montana, Rouzbeh from Michigan, Joe from New York, Scott from Wisconsin, Keith from Ontario and Tim from Texas...
1995 Chevrolet Astro 4.3L refrigerant loss VIN: 1GNDM19Z1R
great news\the van has been gone a week with no complaits from i updated before,we replaced the compressor with customer ok and all is well.thank you again to all that responded.
1995 Chevrolet Camaro 3.8L Poor Idle Quality, Hesitation, Stall VIN: 2G1FP22KOS
I want to thank everyone that replied and tried to help with this post. a PCM replacment ended up fixing this car 5 volts reference was being lost controling the map, TPS and EGR All sensors checked out good but the intermitent problem is what kept me from put... Trouble codes: P1635 (5V reference A circuit problem), P0122 (TPS low).
1996 Chevrolet Beretta 3.1L No Start, Stall VIN: 1G1LV15M0T
Thanks for all of the help. We finally found that the wire leading to the rear Crankshaft Sensor was burned thru because the wire was hanging over the exhaust manifold. We replaced the wire and everything is now OK. Again thanks, it is so often something simpl...
1997 Chevrolet K3500 6.5L ecm-b fuse VIN: 1GTHK34F0V
I would once again like to thank the replies that I received, what appears to have been the problem is the harness that is behind the master cyl. that fastens to the firewall and houses 4 wires that go to the lift pump had wiring insulation at that connector t...
1999 Chevrolet Blazer 4.3L Poor Idle Quality, Hesitation, Misfire VIN: 1GNDT13W9X
thanks for all the help everyone turns out that even though i had the correct fuel press. i did not check the volume of fuel fuel filter was plugged even though pressure was ok thanks again Mark
1994 GMC Safari SLE 4.3L Front Brakes VIN: 1GKDM15Z5R
Got allot of replies to this one.Most all of them said to check the flex hoses.I had just replaced them.Even with the Flex lines removed from both sides fluid would flow freely from the right side & no flow from the left side.Thought maybe restriction in the s...
1996 GMC Yukon SLE 5.7L Cuts out, Stall VIN: 1GKEK13R5T
Thanks to all who offered help. The fix was an igniton switch. we put one in and the cust. drove for three weeks and reported back to us that he had no problems.
1997 Oldsmobile Silhouette 3.4L Misfire, MIL Lamp on VIN: 1GHDX06E3V
Many thanks to those replied to my problem vehicle. Given my past expiriences with working with Land Rover, this particular problem with the Olds had simular simptoms of possible sticking valves. What convinced me to stay the course of diagnosis that the probl... Trouble codes: P0300 (Multiple Misfire).
1993 Pontiac Bonneville SE 3.8L oil pressure VIN: 1G2HZ52L4P
Thank you all for your help, what we ended up doing was to pull the engine out and tear it down. The cam bearings were wasted allowing the oil pressure to drop when warm so we installed a crank kit and cam bearings & replaced the cam, blew out everything real ...
1997 Pontiac Trans Sport 3.4L ABS Module VIN: 1GMDX03E4V
I was going on the wrong info on this one. It appears that the Genesis will not pull up codes on this veh. I used my Snap-on MT2500 and retreaved a wheel speed code out of history. NOTE, if you have access to another scanner when diagnosing something that seam...
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