GM Automotive Technicians Technical Discussion and Fixes for Aug 8, 2007

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Open Help Requests for GM

	Help Request	Answers
	1997 Buick Park Avenue Ultra 3.8L Stall VIN: 1G4CU5216V this car starts and runs great,on cold start - outside temp 70* car runs for about 4 to 10 miles and just shuts off - slide in nuetral twist key and starts right away and will run great for 50+ miles for customer to return from work place.seems to need to sit ...	View
	2001 Buick Regal LS 3.8L engine VIN: 2G4WB55K11 I have a 2001 regal and every time you turn the signals on the engine dies out.The four ways have no effect on the engine.If you pull out the front lamp assembly plugs it stops happening Any help would be greatly appreciated Thankyou neil [...]	View
	1994 Cadillac Seville SLS 4.6L temp gauge VIN: 1G6KS52Y7R I have a strange problume with this cad. As the car warms up at about 200 degrees the stop engine overheat message only for a brief minute then turns off. the car gose into limp mode for the breif time the message is on. car doesnot over heat and temp gauge re...	View
	1998 Cadillac Seville STS 4.6L waterpump housing VIN: 1G6KY5493W Vehicle's waterpump housing is leaking coolant. Is it possible to remove the housing in the vehicle. Mitchell has 4.4 hours. It looks real tight down by the transmission. I don't want to open up a can of worms. I have no repair procedure available to me on thi...	View
	1999 Cadillac DeVille 4.6L Hesitation, Cuts out VIN: 1G6KD54Y8X Customer complains car jerking at times and hesistates when accelerating. Ck out ignition circuit, replace module & cam sensor, hooking up Tech2 nothing found at all. Any body has experience on these codes, please advise. Thanks. Trouble codes: P0371 (Ign. control 24X pulse fault.), P0372 (Ign. control 24X missing pulse), P1323 (Ign. control 24X low freq.), P1350 (Ign. control 24X.)	View
	1986 Chevrolet C20 Custom 5.7L Unknown VIN: 1GCGC24M86 this vehicle came to us a few years ago, and we have done the repairs for those years, it has had 2 crate motors and 2 rebuilt transmissions. In the last year or so it has broken 4 flywheels, the last one was for a 2 ton truck, (very heavy duty), and it has br...	View
	1991 Chevrolet Cavalier Z24 3.1L No Start VIN: 1G1JF14T6M This car came in as a no start it had very low fuel pressure so I installed a new fuel pump, strainer, pump wiring harness, and fuel filter. Now it has good fuel pressure about 48psi at key on but it will not start but if I spray just a little starting fluid i...	View
	1992 Chevrolet Lumina Euro 3.1L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 2G1WN54T5N The car acts like it has a dead spot in it when you step on the gas. The customer was stopped then gassed the car and turned left to cross traffic and it stalled out. While on a test drive it just feels like it has a dead spot and then it takes off after a sec...	View
	1993 Chevrolet Lumina Z34 3.4L Engine VIN: 2G1WP14X1P This Vehicle Came Into The Shop Needing An Engine Replacement. I'm Looking For Some R&R input, Specifically Rather I Should Drop It Out The Bottom Or Pluck It Out The Top ? Any & All Help Will Surely Be Appreciated	View
	1993 Chevrolet Lumina APV 3.8L Surge, MIL Lamp on VIN: 1GNDU06L7P Gentleman Had a customer referred to us from a local tranmission shop. The owner has had a long running problem with the van bucking under partial throttle/load. We have duplicated this condition in road test. Customer states it's worse in warm weather. Cold/... Trouble codes: 88 (PCM Reset), 99 (Power management problem), 65 (Cruise control servo position sensor), 66 (A/C pressure sensor/circuit), 67 (Faulty cruise control switch), 69 (High pressure switch circuit)	View
	1993 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Surge, Cuts out, Stall VIN: 1GCDC14K4P It would have been easier to list what has'nt been changed on this truck that being the PCM, EGR, fuel injectors.I dont have access to the truck right now, I usually see it on the weekends. I have had this problem before I replaced the engine, And really made ...	View
	1995 Chevrolet Cavalier Z24 2.3L Steering assist VIN: 3G1JF12D6S Car was brought to my shop from another shop who is reputable and honest but uses us when these problems occur as they are primarily a body shop. Car has no power steering assist. Pump is driven from the end of the camshaft via Quad 4 engine. The car came to h...	View
	1996 Chevrolet Blazer 4.3L Hesitation, Surge, Poor Fuel Economy, fuel leak VIN: 1GNDT13W1T This vehicle sat for seven months with a bad trans. customer finally had us replace it. after repair a complaint of fuel leaking was brought to our attention. Upon inspection we found fuel coming from the vapor pressure sensor above the frame rail. Using modis...	View
	1996 Chevrolet Lumina 3.1L no reverse when the trans. is put into reverse it does not enguage (like the trans is in neutral) after 3-4 minutes of sitting in gear it will enguage, at first there is a slipping type feeling (car will slowly roll backwards, if engine is reved just slips, then it will ...	View
	1998 Chevrolet Camaro 3.8L Engine Removal VIN: 2G1FP22K7W This vehicle came in with a bad rod knock so we need to pull the engine out to get it rebuilt. Reading through Mitchell, it says to pull the engine out the bottom (probably due to the fact half the engine is under the cowl). Looking at the vehicle it looks lik...	View
	1999 Chevrolet Tahoe LS 5.7L engine VIN: 1GNEK13R5X OK,This Tahoe had a slight misfire on start-up. Finally determined cracked head or head gasket(pressurized cyl.#4 and water shot out of radiator). Removed heads and sent to machine shop and determined 3 cracked cyls. in heads. The shop repaired cracked heads,r...	View
	2000 Chevrolet Express 3500 5.7L NO REVERSE, 1st ONLY VIN: 1GCHG35RXY Hello everyone and thanks for the input on this one. A customer of mine just bought this delivery van and it has lost reverse and all forward gears but 1st. This is a 4L80E. In manual or automatic forward postions, it only has 1st and when you get up to speed ...	View
	2000 Chevrolet C2500 5.7L Stall VIN: 1GCGC24R1Y customer said vehicle will stall when shifting into reverse - i couldn't get it to stall untill after driving at least 5 or 6 mi & only if i shifted from dr to rev quickly. if going from dr to n to rev like normal it wouldn't stall. the customer said it would ...	View
	2001 Chevrolet Malibu 3.1L rpms VIN: 1G1ND52JZ1 once or twice a week on the highway only between 100 and 120kms per hour the cruise control will shut down and the rpms will jump up approximately 400 rpms and comes back down===problem has been ongoing for about 1 year===no codes were presented===abs light ha...	View
	2001 Chevrolet Silverado 3500 6.0L cruise control VIN: 1GBJK34U81 thanks in advance for reading this post. we have this truck that the cruise control is inop, all inputs from cruise control switch, brake switch, powers, grounds, vss are good. the only wire i'm not sure about is cruise engage input, have b+ at wire disconnect...	View
	2002 Chevrolet Express 1500 4.3L Misfire, MIL Lamp on, MULTIPAL CODES VIN: 1GCFG15W32 only #2 has misfires at speeds of 40 mph - 45 mph when accelerating setting both codes p0101 and p0300. same results when both upstream o2 sensors pulled. when fails- freeze frame loads 40 map hg 27.8 rpm 2045 maf gm/sec 67 speed 44 egr volt .73 egr pos 0 ba... Trouble codes: P0101 (mass air flow circuit out of range), P0300 (random misfire)	View
	2003 Chevrolet Suburban 1500 LT 5.3L Poor Idle Quality, Misfire VIN: 1GNFK16Z93 car came in w/po300 miss fires ck plugs & replaced ck wires coils & injectors all good ran compression ck all at 145 to 160. tech then ck fuel pressure an found it below spec 40 psi replaced pump & filter still no fix ck back pressure on cat had .5-1.0 at idle... Trouble codes: P0300	View
	2004 Chevrolet Suburban 2500 LS 6.0L Encoder Motor VIN: 1GNGK26U24 Vehicle came in with service 4 wheel drive in the instrument cluster. Retrieved code C0327 - Encoder motor circuit malfunction. 4 wheel drive buttons light up on bulb check but have no lights when truck is running, and buttons don't seem to do anything, but on...	View
	2004 Chevrolet Monte Carlo LS 3.4L Starting VIN: 2G1WW12E04 car was at dealer for starter runs 2-3 sec after start. they could not duplicate. car is now at our shop & can not duplicate. i dont think customer is crazy. i know that this is not much info but any help would be great. thank you	View
	2007 Chevrolet Corvette 6.0L vibration VIN: 1G1YY36U67 This car has developed a vibration that is worse when the car is first driven and seems to improve as it warms up. It is almost a shutter making me think it may be a driveline or transmission problem. It does not change with braking. Of course it is not possib...	View
	1993 Geo Storm 2+2 1.6L Starting VIN: J81RF2369P hello fellow techs i am working on this gem of a vehicle that has a 1.44 amp draw. i have pulled every fuse and relay that this car has with no apparent change in the draw. i have even removed the aftermarket alarm. i have a lot of time already into it and am ...	View
	2000 GMC Jimmy SLE 4.3L Hesitation, Surge, Misfire VIN: 1GKTD13W9Y hi gm tech... i ajust the cam retard on this vortec... it was -11... my question is... is the timming chain a possible cause??? now its on 0 degree and it runs fine...	View
	2005 GMC Canyon Z71 SL 2.8L false activation VIN: 1GTCS19865 Hi Replace front hubs ,rotors and pads and ABS slow speed false activation developed afterwards.My scanner does not go up to 2005.Will receive new cartridges in a week.Read a lot in the archives about scanners versus scope. Just got a new Matco md4000 scope,ho...	View
	1997 Oldsmobile Achieva S 3.1L rear brakes VIN: 1G3NLYZTWM Hey again all, I am hoping you can lead me in the right direction on this one. The car was rejected for state inspection at our shop because of brake problems. The rotors were too thin and rear brake adjusters froze up but the main problem is that when you ste...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1998 Cadillac Catera 3.0L traction control lamp VIN: W06UR52R5W took vehicle to dealer for reprogramming and all is well, live and learn, tahnks for the replies i got. john	3
	2001 Cadillac Catera 3.0L Abs Module VIN: W06VR54R6Y Well I would like to thank all that replied. I proceed to retest every power and ground at the EBTCM for intermitten loss, all checked ok at time of tests only one option left replace EBTCM. I called the local dealer to get a price 1200.00 list, I called my cl...	5
	1993 Chevrolet Lumina APV 3.1L No Start, no spray or injector VIN: 1GNDUO6D2P Very shamefully I will admit, the black two pin connector with the white wire and the purple/white wire was plugged in upside down. So here is how they should be, and I hope noone else makes this mistake: As labled on the module: P and N go to the ...	8
	1997 Chevrolet Malibu 3.1L Low Coolant Light VIN: 1G1NF52M6V	14
	2000 Chevrolet S10 2.2L Misfire, MIL Lamp on VIN: 1GCCS1446Y Thank you all for the hints. I pulled the coils and used a test light to check for flash from the primary terminals of the module, there was none on # 2-3. Turned out to be a bad module. This is the first module I've seen fail on just one of the two coil pa... Trouble codes: P0300 (Multiple Cylinder Missfire).	7
	2000 Chevrolet Tracker 1.6L No Start VIN: 2C3GND3782 after checking cam signal noticed that the signal was quite strange. it would drop off and then i would get a signal but most of the time signal was not present. after removing the cam sensor housing found that the reluctor wheel on the cam shaft only had two ...	3
	2001 Chevrolet Venture LS 3.4L starter VIN: 1GNDX03E51 I hooked up scan tool and found the security activated. I took and had the system tested and found the chip in the key to be bad.	12
	2001 Chevrolet Silverado 2500 6.0L shift problem VIN: 1GCHC23U01 Thanks for all the replies... had to let it go... we dont do a lot of trans work here... i wondering if its not a really a prooblem... i could live with it.	4
	2001 Chevrolet Express 2500 4.3L Misfire VIN: 1GCFG29W51 I PUT THE NEW UPDATED INJECTORS IN FIX THE PROBLEM THANK YOU GUYS	8
	2001 Chevrolet Cavalier 2.2L theft system VIN: 1G1JC12491 thanks for all the help i did end up replacing the lock cylinder and key then programed the theft system all working good	7
	2001 Chevrolet Tahoe 5.3L MIL Lamp on VIN: 1GNEC13T71 i replace the switch valve solenoi, and the problem is gone. the valve sometime not working. this is what i think original, but i am not sure. thanks to all good techs who help... thoa Trouble codes: P0410.	9
	2004 Chevrolet Trailblazer LS 4.2L Hesitation VIN: 1GNDT13594 WE REPLACED THE FUEL PUMP AND THE FUEL FILTER AND THE VEHICLE IS "FIXED" WE THINK. THANK YOU ALL KEITH	4
	2005 Chevrolet Malibu LS 3.5L Unknown VIN: 1G1ZT52805 I WAS ABLE TO PROGRAM THE BODYCONTROL WITH THE TECH 2 AND THE MILLAGE	3
	1999 Oldsmobile Alero GLS 3.4L Fuel Odor VIN: 1G3NF52E5X The fuel odor is gone- The feed line to the right rail uses the same size o-ring as the crossover tube and I was able to match the o-ring in the plumbing section of my local hardware store. This leak was caused primarily by a previous repair, someone had repla...	5
	2003 Oldsmobile Alero GL 3.4L Drivers power window VIN: 1G3NL12E53 Thank you for the replies I replaced the switch like many of you suggested and the problem seems to be solved.	5
	2001 Pontiac Aztek 3.4L Charging VIN: 3G7DA03E11 I installed a new battery and customer says it did not help. I have been on vacation and and have not seen car since i left. Will have to close this as a non fix, sorry.	13
	2002 Pontiac Montana 3.4L Unknown VIN: 1GMDXO3E12 Thanks for all of the relies,I found that the blend door motor lever was getting stuck on the motor.I removed some plastic on the motor and now it has a [...] temp drop. thanks again.	9

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