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Prev Professional Automotive Repair Technical Discussions for June 19, 2006
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Open Help Requests for GM
Help Request Answers
1993 Buick LeSabre Custom 3.8L Excessive Emissions VIN: 1G4HP53L4P
car failed state inspection fo hi nox.nspect coolant system found transmission fluid in coolant.motor vac done. pulled egr checked for clogged ports ok. put power / ground to egr valve when running not a large rpm drop. i am not sure if egr is being commanded ...
2001 Buick Century Custom 3.1L Surge, Misfire, MIL Lamp on VIN: 2G4WS52J71
I did a cylinder head gasket about a year ago on this vehicle because intake manifold gasket was leaking into cylinder. Today vehicle came back for multiple problems. Customer complain vehicle misfire during accleration, lost of power, and delayed shifting. I ... Trouble codes: P0300
1981 Chevrolet K5 Blazer Custom 5.7L Excessive Emissions VIN: 1G5EK18H0B
Ok this blazer is not stock has aluminum heads angled plugs and no air pump and headers dual exhaust glasspacks. Thank you to start with. Vechicle came in not passing emissions idle test. I could not adjust carb lean enough to pass idle test.And then noticed h...
1991 Chevrolet S10 Blazer Tahoe 4.3L Poor Idle Quality, Stall VIN: 1GNCS13Z7M
Hello Techs, Its been awhile since Ive had to use this but im in serious need of help. This one came in two weeks ago, and the boss handed me an IAC and told me to put it in. I did. the car ran fine before and after. Last week it comes back and customer is com...
1995 Chevrolet Camaro Z28 5.7L cooling system VIN: 2G1FP22P3S
hello techs, this vehicle came in overheating and loosing coolant. we diagnosed it as a water pump and did the repair. problem is now it still overheats. i think i have an airlock but i can't get it bled out. it has no heat from heater we have flushed it with ...
1995 Chevrolet Blazer 4.3L Cuts out, Misfire, MIL Lamp on VIN: 1GNDT13W9S
this vehicle came in with an acceleration miss (violent miss) and a code 341 & 338, my customer has had this to a variety of repiar shops and everything has been replaced, even the vcm. the car wont miss when brake torqueing, only when accelerating on the road... Trouble codes: P0341, P0338
1999 Chevrolet Corvette 5.7L Stall VIN: 1G1YY22G6X
i tested fuel pressure it 8 psi book tells me 55 to 61 i enable pump from scanner no change i check steel bradded line on fuel rail same 8 psi is that line from pump or is it return line i changed fuel filter one side i can blow thought other side acts blocked...
2002 Chevrolet Tahoe LS 5.3L cooling system VIN: 1GNEK13Z42
This is a fleet vehicle that idles for periods of 8-10 hours at a time with the AC on, while on shift. The current conditions are temperatures around 100-106 degrees. The vehicle will run for about 3-4 hours until it overheats (temp gage reads 230, scaner read...
2002 Chevrolet Cavalier 2.2L engine will not start VIN: 1G1JC52412
cust brought car in the shop , said it would die at times, and it wouldnt start back,that you would have to sit for a few mins and it would start back,so i brought the car in and scanned for codes , i pulled a u1000,u1064,p1626,b2707,b2662,b2958,u1088,u1096,at...
2001 Geo prizm 1.8L MIL Lamp on VIN: 1V1SK54871
after first repair car came back with ses light on again, but now is setting code p0441 for no flow during purge. smoke tested evap system, no problems found. pressure tested evap system no problem found. tested all soilnoids on and off car. all ohmed out ok a... Trouble codes: P0446, P0441
2001 GMC Yukon XL 1500 SLT 5.3L abs VIN: 3GKFK16T81
this yukon came in with a abs light on ck'ed codes and found c0265 ebcm relay circuit. ck'ed for batt voltage at the module (ok). next i ck'ed ohm's of pump motor and that is were it took a left turn alldata say's .3 - 1.0 ohm's and the pump motor was much gre...
1993 Hummer H1 6.2L No Start, Cuts out VIN: 137XE8336P
Hello all, Have this Hummer diesel which is giving me the fits. I am not a fan on diesels nor do I work on them usually but this is the truck of a guy that restores my wood in Classic cars. Vehicle towed in no start. Found broken wire at Glow Plug controller a...
1991 Pontiac Grand Prix STE 3.4L abs pump VIN: 1G2WT54X6M
when appling brakes at stop you can hear abs pump cycling it drops rpm to point of killing engine you can see a very hard voltage drop 14.1volts down to 13.3 any ideas
2000 Pontiac Montana 3.4L Steering, suspension VIN: 1GMDX13E6Y
This van came in with a complaint of a popping sound when turning. We can duplicate the noise by driving the van backwards and forwards with the wheels turned in either direction (seems worse when wheels are pointing left)this will occur at low speeds. When we...
2000 Pontiac Bonneville SE 3.8L Window VIN: 1G2HX54K2Y
Ive got this 2000 Bonneville that is acting like ghost is in it. The drivers window works perfectly, but none of the other window work from any switch. The drivers door lock unlocks, but wont lock and the others wont do anything from any switch. All problems a...
2002 Saturn Vue 3.0L service light VIN: 5GZCZ63B32
i have a problem with this vue.i get a code p0065 out of the bcm history only.clear code and it comes back only in history never current.i know this shouldnt be a p code but i get it anyway.if anyone knows what this code means,or seen it before any help would ...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52L8S
Thanks to everyone for all your inputs. The fix is a rem: PCM. After all the vss circuits checks out good, the only thing left is the PCM. Now the speedometer/odometer and vss can be read and the tranny is doing just fine. Thanks again to all of you and especi... Trouble codes: P0502.
1969 Cadillac eldorado 472CID compressor
Hi guys. First I would like to thank all who replied. Most knew the problem was the POA valve. Some felt R134 would not work on this system but the owner also has a 1970 coupe which I used R134 succesfully with a POA valve a week before. I could not get the va...
1992 Cadillac DeVille 4.9L Excessive Emissions, No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1G6CD53B1N
Thanks for all the help on this one. I cleaned all the engine grounds with no results. I then replaced the computer and the car is running great. Thanks Daniel
1995 Cadillac Fleetwood 5.7L Surge, Misfire VIN: 1G6DW52P2S
Good morning,The cadillac fleetwood is fixed. bad electrical connections on ckt 430, high resolution signal to pcm was causing idle flare/surge. also, we removed distributor to inspect reman unit. there was a metal shield missing inside. replaced with another ...
1989 Chevrolet Corvette 5.7L No Start VIN: 1G1YY3183K
Problem with this 1989 Corvette was no power at fuel pump. Simple fix turned out to be bad F/R (fuel pump relay) fuse in fusebox. This fuse ONLY has power during cranking or engine run. When testing fusepanel, you will find a dead hole and may be thrown off tr...
1993 Chevrolet Corvette 40th Anniversary Edition 5.7L No Start VIN: 1G1YY23P8P
Well this one is done. Just a few minutes after posting I did cut the tach filter out of the system. It still would not start. I found the ignition module was also bad. I am unsure of the first problem. I would have to say that the filter shorted to ground int... Trouble codes: 42 (IC Grounded).
1997 Chevrolet Blazer 4.3L Leaking Refrigerant VIN: 1GNDT13WXV
Good morning fellow techs!!! 'Houston...We have a repair.' The problem was no cooling due to the compressor leaking the refrigerant, just like 15 out of 37 of you stated, out from the compressor body o-ring. I took the UV light and aimed under the compressor ....
1998 Chevrolet K1500 Suburban LS 5.7L MIL Lamp on VIN: 3GNFK16R3W
I talked to the customer yesterday and the light still has not come back on. I had amy replies to replace the vent valve but for some reason chevy could not find the right vewnt valve. The vent valve is mounted on a bracket on the side of the canister mounted ... Trouble codes: P0442.
2003 Chevrolet Avalanche 1500 North Face 5.3L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Misfire, Poor Fuel Economy VIN: 3GNEK13T23
Sorry it took me so long to close this post. Thanks to all who offered there help. I took it to the local GM dealership for inspection of cats. Dealer says cats are fine but would not do a backpressure test, only tested efficiency. Tested for intake leaks repe... Trouble codes: P0300 (random cyl missfire).
2000 GMC Sierra 1500 SL 5.3L Shift Feel VIN: 1GEK19T7YE
This one is fixed and gone, hopefully forever. After further checking on reflash possibilities and pressure control issues, I decided to pull the valve body to have a look, even though the pan was very clean. Low and behold the 4/3 sequence valve was sticking....
2001 GMC Yukon SLE 5.3L whistleing noise VIN: 1GKEC13T51
I want to thank everyone who took the time to help me , but as most of you mentioned it is a normal sound from air traveling into the engine on the Vortec Gen III engines. I did try to explain the situation to the customer but she did not want to accept the di...
1992 Pontiac Sunbird LE Value Leader 2.0L Unknown VIN: 3G2JC11H3N
Thank you for all your help. We found the vacuum leak under the dash for the vent controls on the passenger side. It was difficult to find because it would only make noise while braking in motion. The problem is gone and the customer is happy. Thanks again
2001 Pontiac Grand Am SE 2.4L trac light VIN: 1G2NF52T21
thank you to those who replied after replacing the failed oxygen sensor on this car I cleared the codes and the light has stayed off ever since. I guess the code was a byproduct of the bad oxygen sensor.
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