iATN Member GM Auto Repair Tech Exchange for July 30, 2008

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Open Help Requests for GM

	Help Request	Answers
	1963 Buick skylark CID ride control This car came in about a month ago for a shimmy around 40 miles per hour. Guy decided to replace all the front end parts due to some where on a few. Just going through it, process of restoring. My question is does anyone no of a cause for the shimmy, only when...	View
	1991 Buick Regal 3.8L emergency brake The emergency brake is inoperative on the left side. The right side holds well. The lever is going to the stop there is no travel left but the brake does not hold. Is there an adjustment for these things or am I missing something?	View
	1998 Buick Century 3.1L starting hello to all and thank you. our century came in 2 weeks ago for an alternator charging 18.5 volts replaced alternator sent home next day returns with a car that starts in the run position all by itself turn key off and the starter stops turn to the run positio...	View
	1999 Buick Century 3.1L Misfire Thanks for your help. We have a century with an interment misfire. It sets p0300 only, and when I go back through the miss history I see cyl #2. It never sets p0302! The miss usually happens on acel up a hill hot in 4th with tcc locked. I have switched module ... Trouble codes: PO300 (Random misfire).	View
	1995 Chevrolet Pickup 7.4L No Start this truck act like it is not getting enough fuel. pressure is at 14 psi. if i pinch the return line off i can get the truck to run it bump the pressure up to about 41 psi. i dont think i have the fuel pressure to make it run right. most tbi was 9-13 psi. but ... Trouble codes: 54 (fuel pump circuit).	View
	1999 Chevrolet Cavalier 2.2L Charging Hi guys and thanks in advance for any help.I'm posting this because maybe i've overlooked something and it has me a little stumped.I've got this 99 cavalier that came in not charging.The battery light is not on while running.Voltage across the battery is 12.9 ...	View
	2005 Chevrolet Malibu 2.2L radio, trunk release button hello fellow techs. i am currently looking at this malibu that has several inop accessories. the radio is completely dead no display. also the trunk release button located on the left side of the driver seat is inop. and finally the digital display of the curr...	View
	2005 Chevrolet Equinox 3.4L Hanger Bearing Hi, I started doing a hanger bearing on a Equinox AWD when I removed the front of the driveshaft all the balls for the CV part of the driveshaft came a part and the outer part of the CV is seized in the yoke of the transaxle .Any ideas to get this back togther...	View
	1999 GMC Safari 4.3L Misfire this van has been to another shop for an lower intake gasket.customer got van back running bad. customer found dist.out of sync. replaced dist.,cap ,wires,and plugs. runs better but has miss on cyl. #4 . only at 50 to 70% load. now this mess is mine. i checked... Trouble codes: PO300 (random misfire).	View
	2005 GMC C6500 6.6L lost high idle ths truck has lost it's pto high idle operations and cruise function. repair cruise by replacing defective stop lamp switch with oem. when the oem dash pto switch is pressed normally the high idle begins in approx 8-10 secs. no codes, checked ecu inputs and al...	View
	2000 Oldsmobile Intrigue 3.5L EBTCM module Car came in because of lights on dash: ABS, service vehicle soon/ PCS. I can't find any info on c0898. C0550 means a malfunction within the electronic brake/traction control module. C0896 means incorrect voltage at the EBTCM module. I followed the diagnostic c...	View
	2000 Oldsmobile Bravada 4.3L converter I have a problem with this trans that is driving me crazy. The trans was rebuilt and has about 10,000 miles on it. It shifts perfect and the torque converter comes in at around 37 mph and is solid. With the tech 2 I can do the torque converter test and the con...	View
	1996 Pontiac Grand Am 2.4L Misfire This vehicle has a random misfire mostly #s 2 and 4 somtimes #1 and rarely #3. It occurs mainly when the engine is hot and under load such as accel from stop or in a cruise in lock-up. I have replaced all related ignition parts module, coils, tower, boots, and...	View
	2002 Saturn SL2 1.9L key and tumbler We had this saturn towed in because the key will not turn. This car has been hard to turn the ignition for some time , you had to have it just right to start the vehicle. To remove the key/tumbler it needs to be in the run position and then push on the release...	View
	2002 Saturn L200 2.2L starts then dies This is strange. The car will start up fine ,rev up to 1500 RPM and die. Then it will not start imediately after it dies you have to wait about 10 seconds then it will start up again and go up to 1500 and die. The code 1599 said something about no crank signal... Trouble codes: U1000 (Class 2 serial communication problem), P1599CC (CC power Management mode or engine).	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1992 Buick Regal 3.8L No Start, Poor Idle Quality, Hesitation, Stall, Misfire OK well this one has me stumped as to why it wouldnt run but here goes on what it actually was. To clear things up I generally dont mess with diag on cars with hard codes unless allowed to fix that issue too. As for wiring all wiring checked good, it has what ... Trouble codes: 41 (cam sensor), 42 (est).	17
	1989 Chevrolet S10 Blazer 4.3L Hesitation, Cuts out, BACKFIRE Thank you all for all the help. I found the o2 sensor was fouled. This vehicle was running rich after the engine install and fouled the o2 sensor. The vehicle runs much better. I still have a slight stumble nothing like before. I have contacted Painless Perfor...	19
	1991 Chevrolet Camaro 5.0L MIL Lamp on THANKS TO JOHN [...] HE PUT ME BACK DOWN TO BASICS, WHY I DIDNT CATCH THE WHOLE 5V OUT OF ECM AND ALLDATA TELLING ME 9.3. I PERFORMED A OUT OF CAR TEST WITH OLD KNOCK SENSOR VERS NEW ONE AND THEN PURCHASED ANOTHER, THE SECOND NEW ONE BECAME THE FIX, BOLTED I... Trouble codes: 43 (esc module or circut fault).	6
	1998 Chevrolet Camaro 5.7L drive cycle OK thank you very much for the help. First off, I did check for pending codes... my fault for not putting that in the problem description. There was never a pending code found. We installed the new Air pump and double checked its operation. We also checked BOT...	13
	1998 Chevrolet Cavalier 2.4L MIL Lamp on FOUND WE WERE NOT GETTING BRAKE SWITCH SIGNAL TO PCM FOUND NO COMMUNICATION TO ABS BRAKE MODULE CUSTOMER DID NOT WANT TO GO ANY FURTHER AT THIS TIME THANK YOU FOR ALL THE HELP. Trouble codes: P1336 (ckp variation not learned).	8
	1999 Chevrolet Suburban 5.7L interior found hvac control unit leaking vacuum. Thanks all	6
	2003 Pontiac Vibe 1.8L no compression found it to be an interferance engine due to lack of maintnence and loss of oil pressure the timing chain tensioner released pressure and the chain jumped. this caused numerous bent valves in the head. a head from GM.is aprox. $2300. . . . and it dosent come ...	4
	2006 Saturn Ion 2 2.2L Poor Idle Quality, Misfire, MIL Lamp on Finally the customer returned. Thank's for all of your help. Ultimately, I found an intermittent fault in the ignition module (mounted to coil-pack assembly). Part was replaced and miss is gone. Thanks again, Trouble codes: P0300 (random cylinder misfire).	11

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