GM Automotive Technicians Technical Discussion and Fixes for Apr 6, 2004 - iATN (Members Only)

×

Join Now

Prev	Professional Automotive Repair Technical Discussions for April 6, 2004 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
	1994 Cadillac Eldorado 4.6L abs/traction control VIN: 1G6EL1291P HELLO THERE TO ALL TECHNICIANS. Have a shop in Italy and once in a while I service american cars. Customer came in one week ago with a lot of error codes in the DIC and other mechanical complaint. Repaired most of the problem exept for one. on he IPC the "AB...	View
	1986 Chevrolet Caprice Classic Brougham 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Stall, Poor Fuel Economy VIN: 1G1BN69ZXG the engine at cold start-up,starts easily and revs to about 1800rpm for a short period and then slowly comes down to normal idle speed,shortly after it does this,check engine light comes on,code 45,engine running rich.the engine i feel is lacking power and has... Trouble codes: 45 (rich exaustreplace 02 sensor)	View
	1987 Chevrolet Camaro Z28 Iroc-Z 5.7L rough idle/no power The customers complaint was while driving it started to run rough and no power.Turned car off did his business then went to go home and was hard to start, cranked fine but hard to fire up and idled rough. Check ECM for codes none the data showed O2 bias rich ...	View
	1989 Chevrolet V2500 Suburban Scottsdale 5.7L Transfer case VIN: 1GNGV26K5K 89 Suburban that won’t come out of 4WD without stopping and backing up. Vehicle has automatic locking hubs and a simple mechanically engaged transfer case. Tires are all the same size, both differentials have same gear ratios. The console lever moves freely in...	View
	1993 Chevrolet C1500 Suburban 5.7L pulling right VIN: 1GNEC16K4P Hello again: we have a fun one hear. this suburban has a nasty pull to the right. the brake pads, rotors, front hose, abs hyd.module & calipers have been all replaced. the module was the customers idea! on a cold test drive all is working just fine but after t...	View
	1994 Chevrolet Astro CL 4.3L Hesitation, Cuts out, Misfire VIN: 1GNDM19W1R Hello to all Gm Techs I have a Astro van that is hesitation about 1700 to 2000 when the trans is about to shift from 1 to 2 and 2 to 3 3 to 4 and when I feel the van missing, I gun the engine and it will run fine. I could make it start to hunt in park about 1...	View
	1995 Chevrolet Lumina APV 3.8L Stall VIN: 1GNDU06L4S Vehicle will stall intermittantly. It will run for an hour and then just stall in the shop. It always starts right back up normally. Sometimes it will stall again right away, start up and run fine for hours. No codes stored. Checked engine grounds, ok. Cleaned...	View
	1996 Chevrolet Camaro 3.8L Stall, Misfire, MIL Lamp on VIN: 2G1FP32K7T need some help fellow techs.got car in shop for running rough.# 6 cyl was dead.replace wires and plugs.skip gone.test drove for about 15 miles and ran fine until about back to shop.check engine light came on and started skipping and then almost stopped in its ... Trouble codes: P0300	View
	1997 Chevrolet S10 2.2L starter VIN: 1GCCS1444V customer brought truck in with starter engaging anytime, it will engage going down road or setting still with no one in vehicle or if key is not in ignition, this is a manual trans and it has had all the componets replaced in article above after problem starte...	View
	1998 Chevrolet C1500 Cheyenne 4.3L MIL Lamp on VIN: 1GCEC19W7W customer came in from another shop complaining that engine light was on, scaned vehicle, all o2 sensors were bad, replace them all, then 2 days later engine light came back on, rescaned again, was the back one, replaced again and still came back on, checked co...	View
	1998 Chevrolet Malibu 2.4L No Start, Cuts out, Stall VIN: 1G1ND52T2W i have a intermitent stall on accelleration it will not restart untill key is cycled off then on sometimes it takes several tries. it looses spark and injector pulse i replaced module crank sensor and computor. then found i am loosing 5 volt reference signal o...	View
	1992 GMC K1500 Sierra 5.7L Poor Idle Quality, Hesitation, Poor Fuel Economy VIN: 1GTEK14KXN vehicle came to us because the idle was not stable at idle. also, volt meter on dash would move down from 14 to 10 volts, the temperature gauge on dash would drop down to 160 and it would run poor. customer replaced parts listed in related repair history tryin...	View
	1995 Oldsmobile Aurora 4.0L Poor Idle Quality, Misfire VIN: 1G3GR66C1S vehicle has intermittent miss at idle, new plugs and wires. the miss is not strong enough to determine which cylinder. have tried swapping coil packs.	View
	1997 Oldsmobile 88 Royale 3.8L ob ii connector VIN: 1G3HN52K6V i get no communication to scanner it keeps on saying check for fuses grounds wirings any solutions gentlemen?	View
	1999 Oldsmobile Silhouette Premiere 3.4L Tail Lights, Turn Signals, Back up lights VIN: 1GHDX03E3X This vehicle came in with the rear lights acting strangely. The Brake lights work fine when the ignition switch is off and the headlights or running lights are off. If any of these are on and the brake pedal is pushed, the indicators for the turn signals both ...	View
	1998 Pontiac Grand Prix GT 3.8L abs VIN: 1G2WP12K8W Car came in with ABS & traction off lights both on, customer told me lights came on after he hit a pothole with left wheels. I used a Snap-on scanner but the scanner doesn't give codes for this system, data only. I drove the car in data mode and left rear whee...	View
	1998 Pontiac Sunfire SE 2.2L Hesitation VIN: 3G2JB5243W This car seems have a hesitation most of the time on right turns, only sometimes going straight. It feels like a quick drop in rpm's then its ok. No codes ,no misfires shown, fuel pressure good in the bay .The computer is under the right fender pulled it to ch...	View
	1999 Pontiac Montana 3.4L abs & tcs light VIN: 11GMDX03E2 hear is another weird one guys: this vehicle came in with a complant of the abs & tcs light coming on intermittenly. when the customer brought the van to us the first time we hooked up the modis and found no codes. after a couple of days she brougt it back and...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Buick Park Avenue 3.8L fuel gauge VIN: 1G4CW52K1V This customer has not returned, and indicated she is moving out of town. Most of the replies I received indicated a poor battery connection or a spike caused by jump starting may cause the fuel gauge needle to end up on the wrong side of the tracks. We were an...	10
	1977 Cadillac DeVille 7.0L power antenna VIN: 6D69S7E663 Thanks for all the help on this one.A special thanks goes out to John [...]. from California (Northern) who hit the location right on the head.Once I had the right relay...I removed and disasembled it.I then used my power probe...which showed that the winding on t...	4
	1988 Chevrolet Gruman 2.5L Surge, Stall, Misfire VIN: 1GBBS10E5J Thanks for the 6 replies I got but the timing must have been off. I switched distributors with the other one, no change,but when I installed the original and set timing the surge and rough idle were gone. It still makes a puff out of the tail pipe now and then...	8
	1991 Chevrolet Caprice 5.0L Poor Idle Quality, cannot set base time VIN: 1G1BL5370M Sorry for the delay on closing. The customer had to take car and was supposed to bring it back, but hasnt returned yet! When he does I have a new distributor I am going to try. Thanks for the help.	8
	1993 Chevrolet K1500 Cheyenne 5.7L blower motor and brake lites VIN: 2GCEK19R2K you guys were spot on. we had to remove trans for anyway repair,and found the offending culprit.a broken ground wire at the back of the cyl.head.with youre input it was easier to spot thanks to every one for their help allan	11
	1994 Chevrolet G30 Chevy Van 5.7L front brakes VIN: 1GBHG31K4R Thanks to all that relied after replacing the calipers, brake hose, rotors,contorl arm bushings, upper and lower ball joints,flushing brake system and pressure bleeding. The fix was the ABS control module And pump. Alot of replies was to swap brake pads trust ...	18
	1994 Chevrolet S10 Blazer Tahoe 4.3L Poor Idle Quality, Cuts out, Misfire, hard starting VIN: 1GNCT18Z2R Glad to say this one is fixed. Many thanks to all who replied. Chet suggested the computer [...] have to be reprogrammed. This one did not. One suggested fuel pressure which I had already checked. Several said computer and sensor grounds. That was the trick. Aft... Trouble codes: P0117 (coolant temp low), P0123, P0139, P0327, P0328 (Knock sensor problem), P0320 (Ign control error).	15
	1996 Chevrolet K1500 5.7L brake system VIN: 2GTEK19R2T several people suggested trying different premium pads, i installed wagner super duty pads but noticed no differnce. many suggested that 12 inches of vacuum was too low and they were correct, turns out my gauge was reading incorrectly, replace it and found i a...	21
	1999 Chevrolet Lumina 3.1L Cuts out, Misfire, MIL Lamp on VIN: 2G1WL52M9X Sorry for the delay, operator is no longer experiencing a problem with this vehicle. Should it act up again I will reply with what I found. The replies I received included a shorted PCM and to check for a blown head gasket. Thanks, John. Trouble codes: P0300, P1381 (Misfire detected no EBCM/PCM serial data).	3
	2000 Chevrolet Tahoe LT 5.3L MIL Lamp on VIN: 1GNEK13T2Y Thanks to Chris, Allen and Cale for taking the time to respond to my help request. Right now customer is driving truck around with no problems other than MIL. When I do get it back which will be soon I will carefully check egr tube to see if its clogged even p... Trouble codes: P0404 (Egr feedback signal out of range), P0230 (Fuel pump control circuit problem).	6
	2001 Chevrolet Silverado 2500 HD 6.6L Cooling Systems VIN: 1GCHK23191 Thanks for all the help. The customer decided not to continue with and repairs but the most likely culprit looks to be injector sleeves. Thanks again!	9
	2004 Chevrolet Silv 25004wd 6.0L Poor Fuel Economy VIN: 1GTHK24V12 I recieved a lot of great replies...good places to check out. I realy appreciate the help. www.transferflow.com looks like the best bet. Thanks again.	8
	1996 GMC Jimmy SL 4.3L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GKCS13W8T This vehicle came back in the shop today. Customer said the MIL came on only after he drove 80 mph on the expressway. Found a bad ignition coil - arcing internally! We also found the CAM RETARD signal at -10º, so we reset that to as close to zero as it would g... Trouble codes: P0340 (camshaft sensor circuit malfunction), P0175 (fuel system too rich bank 2).	6
	1997 Pontiac Grand Prix GTP 3.8L abs module VIN: 1G2WP1212V well it turned out it was the front wheel speed sensor... i only had one repley ...he said ck the history codes... there it was ..fornt wheel speed sensor...i cant remember his name but if he reads this i would like to thank him for his time Donald s.Phillip...	5

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