GM Automotive Technicians Technical Discussion and Fixes for Mar 14, 2007

Join Now

Prev	Professional Automotive Repair Technical Discussions for March 14, 2007 International Automotive Technicians' Network (iATN) - Members Only	Next
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM

	Help Request	Answers
	1997 Buick Century Custom 3.1L park/delay posistion VIN: 2G4WS52MXV I hope i didn't miss something obvious here but here goes.The car in question came to the shop with the wipers parking about 1/3 from the bottom,automatic assumtion was a bad circuit board.Found out after, problem started after a freezing rain(tried using wipe...	View
	1993 Cadillac DeVille 4.9L Hesitation, Surge, Misfire VIN: 1GTER56SEP this vehicle came in at first and would not do anything for me it would only mess up when the customer would go on a 30 to 40 mile run. it skips very bad. they wanted to put parts on. i replaced all tune up parts. cap rotor button plugs wires, coil. this did n...	View
	1994 Cadillac DeVille 4.9L Poor Idle Quality VIN: 1G6KD52B3R Hi there, Deville will idle very high when warm, drives down road as if the cruise was set, tested and replaced valve/stepper motor for idle stop(would not move), now vehicle idles fine, but intermitantly whilst cruising at light throttle, you can feel the gas...	View
	1994 Cadillac DeVille 4.9L Control head VIN: 1G6KD52B8R The De-ice mode does not work. LED in switch does not light when activating the switch. We have greatly improved the flow of air to the windshield in the defrost mode. The original complaint was no or little defrost.Power and ground appear to be good. The cont...	View
	2000 Cadillac DeVille 4.6L Cooling Systems VIN: 1G6KE54Y3X Im having troubles with this car. The temp gauge on the car is showing 220F. The fans our kicking in at 220F. The informations that I have is not telling me when the fans should kick on. I have hooked up scanner and it is showing the same readings that is on t...	View
	2003 Cadillac Escalade 5.3L Alignment VIN: 1GYEC63TX3 This Escalade has a firm drift to the right even after the camber and caster was set to specs (including about .5° caster spread). I've already swapped front tires, etc. I don't like the thrust angle (-.27°) but I believe that number should produce a pull to t...	View
	1988 Chevrolet Celebrity 2.8L No Start VIN: 3G1AW51W9J This car dies out on the freeway and towed in to shop. There is no service codes. Spray with carb cleaner through the intake while cranking and still no running. Hook up timimg light to spark plug cable and noid light to an injector conector, they both has fla...	View
	1989 Chevrolet G20 Sportvan 5.7L service engine soon lite VIN: 2SADC52GDC SERVICE ENGINE SOON lite is on. I have used a Mitchell Pro 9000 older scan tool but nowhere on it is a function to turn off this lite? Is there a quick and easy way of doing this. Van runs great and no codes present.	View
	1992 Chevrolet C1500 Cheyenne 5.7L Likes retards VIN: 2GBEC19KXN Hello all, I got one in that a customer muddied the waters on by trying to fix it himself. His original complaints were check engine light on and hesitation/cutout and rough idle. He replaced the distributor because "a parts store told me thats what the che... Trouble codes: 42 (EST circuit fault)	View
	1994 Chevrolet Camaro Z28 5.7L Possibly ABS module VIN: 2G1FP22P8R This one is our shop project car. Problem began simple enough, it would not hold enough rear brake pressure for us to stall it up(Equipped with a 3800 RPM Yank converter). Attempted to bleed rear brakes and they had almost no pressure or fluid flow at the rear...	View
	1998 Chevrolet K1500 Cheyenne 5.0L Unknown VIN: 1GCEK19MXW Replaced motor 500 miles ago everything went great. Now i am getting a humm noise at first start up from engine compartment that was not there before engine swap. Noise only lasts 3-5 min. Almost sounds like it could be caused buy some sort of vac problem. Thi...	View
	1999 Chevrolet S10 4.3L No Start, Stall VIN: 1G3445HFFH hi guys i have this 99 s-10 that someone has put a 350ci in.it came to me about 3 weeks ago as a no start.it has a after maket disbutor its a flame thrower its a two wire disb + - . it has a ignitor in it,this truck has a carb on it also,really no engine contr...	View
	1999 Chevrolet Venture 3.4L passkey VIN: 1GNDX03E6X I got this Venture van with a passkey light on in the dash. The van starts up every time with no problems. I scanned the VTD module & PCM for codes with Tech2, none present or stored in history. This van has Passkey 3 system, engraved PK3 in the key. After goi...	View
	2000 Chevrolet Express 3500 LS 5.7L No Start, Stall VIN: 1GBJG31R4Y Thank you in advance for reading this. This came in on a tow truck, our customer stated that it stalled on him on the high way. It would not restart and he stated that it would not turn over, nor would the starter click. The engine would turn over this morning...	View
	2000 Chevrolet Blazer LS 4.3L pressure diff. switch VIN: 1GNDT13W6Y Thanks for your help . Customer developed a leak at left rear caliper and continued to drive untill fulid all ran out of rear portion if resivoir . The pressure differiential switch has tripped and I need to know if it can be reset the same as conventional uni...	View
	2001 Chevrolet C3500HD 6.5L No Start VIN: 3GBKC34FX1 Vehicle was towed in, customer states vehicle lost power and would not restart. Computer Anaylsis was perform initially, scanned codes no codes found but during process lost computer communication after 5 mins of checking vehicle. Found ECM-I circuit 439 fuse ...	View
	2003 Chevrolet C4500 Kodiak C4C042 8.1L fail safe won't engage drive or reverse VIN: 1GBC4E1EX3 Truck wouldn't engage drive or reverse ... Unable to pull codes with snap on scanner... acquired TECH 2 and was unable to get unit to power up ... found no ground at pin 4 of the aldl connector, applied ground to circuit and TECH 2 came to life, was told that ...	View
	2004 Chevrolet Cavalier 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1JC12F34 good afternoon, i have a 2004 chevy cavalier with a 2.2 liter engine. this car has an obvious misfire at idle and more pronounced in drive or reverse. seems ok while driving unless you try to accelerate wot. code p0300b is set and show misfires on cylinders #1... Trouble codes: P0300	View
	2005 Chevrolet Uplander 3.5L air bag VIN: 1GBDV13LX5 Found out customer never showed up at dealer, now past warranty, code isn't hard fault but cant find code b0092 in alldata to go to pinpoint tests. Know it's passenger side air bag problem but nothing else, codes go to b0082 or so and jump to b0100, no 90's at...	View
	2007 Chevrolet Equinox LT 3.4L MIL on P0711 VIN: 2CNDL73F77 Hi everyone. This is my girlfirend's vehice. She bought it new and has had no problems untill the MIL came on. At about 3500 miles the MIL came on and set a P0700 and a P0711. The car was cold started, warmed up and driven 60 miles, shut off then restarted usi...	View
	1999 GMC Savana 3500 5.7L starter VIN: 1GTHG35R4X hello i have this van that will engauge the starter as soon as you turn key on. tryed to remove crank fuse and the starter still runs. replaced the relay and starter with new units from delco. to no change. dont know how to test ignition switch or park/neutral...	View
	1999 GMC Sierra 1500 SL 5.3L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1GTEC19TXX We had scanned this 1999 GMC Sierra 5.3 V8 Truck and had 2 codes, p0171 and p0174. We repaired the upper intake since our data was much like the ones that had that problem. After repair was done the codes do not come back but now the trck is skipping a low idl... Trouble codes: P0171 (Fuel Trim System Lean Bank 1), P0174 (Fuel Trim System Lean Bank 2)	View
	1988 Oldsmobile Cutlass Supreme 2.8L No Start, Hesitation VIN: 1G3WS14WOJ Vehicle came in hard to start cold, we've replaced the coolant temp sensor, regulator, filter, crank sensor, one injector. We have a parts car so we've replaced about everything, has good fuel pressure, checked with noid light, it is like trying to start a car...	View
	1997 Oldsmobile Aurora 4.0L unknown VIN: 1G3GR62C2V Customer states vehicle is overheating by gauge and boiling out of reservoir. Coolant was low on arrival. Pressure tested system and found no visual leaks or pressure loss. Filled cooling system and checked to see if cooling fans are working. Found fans coming...	View
	1988 Pontiac Firebird 5.0L fuel system? new to the forums guy. i am a auto tech student currently employed in the trade for over 3 years. this is my personal car and its driving me batty. when the car warms up if u hold a costant RPM it will start to lose RPMS and then surge back up. or if ur drivin...	View
	1999 Pontiac Grand Am SE 3.4L Stall, MIL Lamp on VIN: 1G2NE52E3X vehicle was in for CEL and running rough at 110,000 miles. needed tune up and had leaking fuel press reg. performed maintenance tune up and replaced press reg, cleared codes and fuel trim was normal. vehicle is back with 117,000 miles and has a P0172 sys rich ... Trouble codes: P0172	View
	2000 Pontiac Bonneville SSEi 3.8L climate control VIN: 1G2HZ5418Y Customer drove th car in stating that the driver side dont get cold. When we checked the system. We found that the passenger side works o.k with no problems we can get hot or cold air. We checked the air flow direction. It works o.k we can make it go to the fl...	View
	2005 Pontiac Grand Prix 3.8L Hesitation, Surge VIN: 2G2WP522X5 the vehicle has an int hesitation off idle on accel from a stop. It may not happen for several weeks but when it does happen the condition will be present until the ign is cycled then the problem will go away. there is no codes set and no after market parts on...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2003 Buick Rendezvous CXL 3.4L 4 wheel drive VIN: 3G5BDO3EO3 Sorry about taking so long to close this post, the customer never brought back his vehicle since it quit snowing and now he does not need the 4 wheel drive, (I hate it when they do that). I did get 5 replies saying that the rear axle is ingaged by a pump and t...	5
	1996 Cadillac Fleetwood 5.7L Long Crank Time VIN: 1G6DW52P8T The vehicle started right up on a cold start.So the marginal bleeddown problem was normal.The fuel pump Was the only problem . Thanks for all replies.	7
	1995 Chevrolet C1500 Suburban 5.7L l VIN: 1GNEC16K3S Hello all. It is late and I have had too much Tequila, since I gave up beer for lent. Anyway, the truck is fixed. I overlooked the obvious, though after at least 300 trans overhauls I have never run into this. The responses were overwhelming. Everything from f...	24
	2000 Chevrolet Tracker 2.0L Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 2CNBE13C7Y Hi all who had a suggestion on this Tracker. It seemed #3 and #4 cylinder picked up on short run a misfire. Suggestions included a possible carbon problem. I feel the broken/gutted spark plug had loosened bits and pieces in the combustion chamber. Using the in... Trouble codes: P0300 (random cylinder misfire), P0303.	4
	2003 Chevrolet Trailblazer North Face 4.2L battery VIN: 1GNDT13S53 hello again, we did end up fixing this one by having the new liftgate module reprogramed. the tool of choice when working on a gm class 2 serial data problem is truely the tech 2.before borrowing the tech2 i did follow every lead.there were so many good ideas....	10
	1993 Pontiac Bonneville SSE 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1G2HZ5212P Thanks for all the input. This car looked like it had a bad ECM. I decided to check this car over again. I rechecked all the sensors they seemed to be fine. So I decided to take the ignition module off of my wife's car and put it on and it run good with NO cod... Trouble codes: 41 (No camshaft reference signal).	19
	1997 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HX52K9V Thank's to all who replied, We ck'd fuel press ,changed fuel pump relay, ing. mod., crank and cam sensor, cleaned ecm conn.'s scanned for snap shot, ck'd for stored codes nothing fixed the stalling. The car will fire right back up. The customer has taken the... Trouble codes: P0135, P1106, P1406.	6
	2000 Pontiac Grand Prix GTP 3.8L engine fire VIN: 1G2WR1214Y I recieved three responces to this post. I thank all who took the time to read and reply to it. I have learned that the NTSB is looking into these fires that seem to happen a few minutes after the cars are shut down. I have seen info suggesting that the O ring...	3
	2001 Pontiac Bonneville SE 3.8L Valve train VIN: 1G2HX54K81 Well this one ended up being a bad lifter after all. I found out that YES a lifter can cause a miss. Cylinder head, push rods, springs, etc. all checked ok. We ended up changing all the lifters. Thanks for all the replies!	11
	1995 Saturn SL2 1.9L No Start, Poor Idle Quality VIN: 1G8ZJ5275S Thanks guys. The sensor and harness was replaced and worked perfectly. This car haunted me. Turns out when the car is in failsafe mode. the letters appear in the data stream. when normal mode the temperature appears in the stream. Thanks again for all the repl... Trouble codes: 15 (ECT reading High or open).	11

(Also Available: All, Asian, Chrysler, European, Ford, GM.)