GM Automotive Technicians Technical Discussion and Fixes for Sep 28, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1997 Buick Park Avenue 3.8L Airbag VIN: 1G4CW52K2V 1997 Buick Park Avenue engine Code K prod 6-96 vin: [...] Hi fellow techs out there, thanks very much in advance for your thoughts and experience. I've been using IATN for a little over a year now. The fix database and forum archives been very hel...	View
	1999 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4CWS2KSX Traction control ses light sir light come on at the same time when caer is started clearing the codes has no effect as all the light come on again im thinking a possible bad connection at the pcm or a connecter that they share am i on the right track? Trouble codes: P1602, P1610, B1159	View
	2004 Buick Rendezvous CX 3.4L Cuts out, lack of power VIN: 3G5DB03E34 Original complaint was severe power loss above idle. Tested exh back pressure at 8.5psi. Called GM as under warranty, GM had replaced cat once before. We installed new cat, backpressure dropped to 3.5 at 2300. tried running without exhaust hooked up, still no ...	View
	1989 Cadillac DeVille 4.5L Stall VIN: 1G6CD5152K car came in for no start. customer complaint it died while driving.. spark ok fuel ok. check mechanical timing ok compresion at 130 psi. no codes.. dropped exhaust manifold and started right up.. installed new cat and car no power, and miss all the way from mu...	View
	1996 Cadillac DeVille 4.6L all upshifts VIN: 1G6KDF2Y8T When this caddi first came in it would not shift out of second gear, no codes. After dropping the pan is was found that one of the shift solenoids was broken. I replace both solenoids and the screen and bracket in the kit from GM. It now has a very late shift ...	View
	1998 Cadillac Seville SLS 4.6L Poor Idle Quality, Misfire VIN: 1G6KS54Y8W Has misfire when cold in mostly cylinder 1 when cold. When engine warms up in (closed loop) the mis-fire goes away and runs clean. Ignition checks out with no codes///date stream looks good except for LTFT...Smoke tested and found leak at rear of intake closes...	View
	2001 Cadillac Seville SLS 4.6L Unknown VIN: 1GGKS54Y01 customer just returned from 4000 mile trip. check engine light on for last 1ooo miles. code p0740 and p1860 stored. alldata does not show p0740 code.has any one seen this code or did we miss read scanner. cleared codes and did not return during test drive. we ...	View
	1993 Chevrolet Corvette 40th Anniversary Edition 5.7L input shaft bearing VIN: 1G1YY23P5P Hello everyone and thanks in advance for the advice on this 6 speed Corvette. The vehicle appears to have a noisey trans input shaft bearing(noise with clutch out, idling). I know the thing needs to come down, but am concerned about special tools needed if I g...	View
	1994 Chevrolet S10 4.3L No Start VIN: 1GCDT14Z7R Before replacing a bad electric fuel pump, I check voltage at the connector at the sending unit connectoor. It read 8.6 volts. Battery voltage at the time was 12.1. Is this normal or should I get battery voltage at this connection Thanks to all!!!	View
	1994 Chevrolet Blazer 5.7L Cuts out VIN: 1GNEK18KOR After replaced several components we have after fire sometimes then at that point we loose power. Note: in reference parts replaced, EGR valve, timing kit and lifter valve are aftermarket, rebuild ECM, Thank you, Anel [...]	View
	1997 Chevrolet Blazer 4.3L wiring VIN: 1GNDT13W4V Good morning, I have a 1997 Blazer that came in with the complaint of "popcorn popping behind glove box, smoke, and a horrible smell". This has happened twice with the truck being driven directly to our shop after the second occurence. There was a burnt elect...	View
	1998 Chevrolet Cavalier LS 2.4L Poor Idle Quality, Surge, Misfire VIN: 1G1JF52T9W Well here goes, I received this vehicle with a blown engine, I procured enough new engine parts to build a new engine, slapped it in and here we are. The engine has a rough idle the MAP is 42-48 kPa hot with misfire occurring on all cylinders. Since I didn't h... Trouble codes: P0300	View
	2001 Chevrolet Suburban 1500 5.3L Steering/ Suspension VIN: 3GNEC16TX1 Customer brought this in with a popping sound a few weeks ago. This was a loud deep "pop" when you turned right and were rolling. We replaced the Right wheel hub because we had been thru this before on GM vehicles. The noise was gone after the repair. We did n...	View
	2001 Chevrolet Silverado 2500 6.0L Poor Idle Quality, Misfire VIN: 1GCHK24U11 this truck is only used about twice a month. one day it started running poorly after sitting for a week. i replaced worn plugs and wires, fuel filter, and flushed fuel injectors and rail. the fuel trims are all within 2% of 0, there are no cylinders that seem ... Trouble codes: P0300 (random misfire detected)	View
	2000 Oldsmobile Intrigue GX 3.5L cooling system VIN: 1G3WH52H3Y car came in for a noise when cruising @ 50-55. found the noise was suging hoses like a boiling cooling system. when this happenes gauge goes up to about 5/8's. also when this occurs lower hose is cool, which is engine output, and upper is hot. acted like head ...	View
	1999 Pontiac Grand Am SE 3.4L ac rpm lites VIN: 1G2NE12E7X on start up at different times rpms will not work then again ac will not work and then again all the warning lites will stay on does different every time it is started has no effect on running of car then at times start and all ok security lite stays on all th...	View
	1998 Saturn SL1 1.9L vent solenoid VIN: 1G8ZH5287W Hi everyone we have this saturn with evap code Po446 (evap vent pluged). Removed vent solenoid and vent solenoid pluged. Replace vent solenoid. Same code returns right away. Took evap lines apart and no restictions. Used scan tool to command vent solenoid to o...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1983 Buick Skylark Custom 2.8L Poor Idle Quality, MIL Lamp on VIN: 1G4AC69X5E First I would like to thank everyone who took the time to offer valuable help. It turned out to be a bad canister purge solenoid. When cps was cold resistance was 35 ohms, but when connected and KOER solenoid would heat up and short out and shut down ecm commu...	15
	1993 Chevrolet Lumina 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2G1WL54T3P Car arrived with customer complaint of poor driveability and MIL. We confirmed poor idle, poor acceleration, and rich exhaust. Car will start immediately. We scanned the ECM and found all the previously reported codes which when erased return immediately with ... Trouble codes: 35 (iac), 43 (ESC Module), 53, 16 (System Voltage too low. System voltage too high), 23 (IAT high), 21, 22 (TPS high. TPS low), 81 (Internal ECM problem).	17
	1995 Chevrolet Camaro 3.4L Poor Idle Quality, Hesitation, Misfire VIN: 2G1FP22S8S Most of the replys said to swap the injector with another cylinder. After looking at this mess, we decided to just go ahead and replace the injector. Unfortunately, now the car won't even start and run. It pops back through the intake like it's out of time. So...	8
	1997 Chevrolet C1500 5.7L serpentine belt VIN: 1GLEC14R8V I would like to start by saying THANKS to all who replied to me request for help. I am amazed by the response I received. It turned out to be the power steering pulley was out of alignment by a fraction of a millimeter. I also checked belt length and it turned...	27
	1998 Chevrolet Venture 3.4L No shift VIN: 1GNDX03E6W Thanks for all the helpfull replies. The van is up and running again.I Hooked up scanner and pressure gauge to tranny.When scanner shows a shift their is a jump in the gauge but stays in first.This tells me that the solonoid is working it is making the shift b...	8
	2000 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS1456Y Thanks for the help. We removed the sensor and could not see any sensor ring. After calling Jasper they agreed that the engine has the wrong camshaft installed in it. They are sending us another engine to install. Trouble codes: P0340.	4
	2001 Chevrolet Blazer LS 4.3L No Start, Stall VIN: 1GNDT13W31 thanks for all the help. many useful replies and helpful informatiom. although no one hit it i am thankful in knowing what other areas to investigate if and when this type of symptom shows up again. the fix was simple, from the engine compartment fuse box runs...	14
	2001 Chevrolet Silverado 1500 5.3L Misfire, MIL Lamp on VIN: 2GCEK19TX1 Thanks to all that replied. Brad and Roger, I think you guys are right on the mark. Pulled a fuel sample, did not see any water but the fuel was cloudy. Found out the next morning after reading your replies that the customer just filled the tank. Installed a c... Trouble codes: P0300 (Multiple misfire detected).	10
	1997 Hummer H1 6.5L Low pressure switch VIN: 137ZA833XV Hi group! Thanks for the replys! The switch we got from hummer has been verfied as the corrct part and matches the old switch we took off, however it will not cycle the clutch. After much searching we found a switch (napa part #rd5-4640-0) that would screw ont...	3

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