GM Automotive Technicians Technical Discussion and Fixes for Jul 13, 2005

Join Now

Prev	Professional Automotive Repair Technical Discussions for July 13, 2005 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
	1988 Buick Regal Limited 2.8L Poor Idle Quality, Stall VIN: 2G4WD14W3J i have cked we have good ignition,great fuel pressure,has fire to the end and fuel pressure,thought it might be maf,but was not tested fine,map sensor test fine also,when you start this car it runs for about 5 secounds then dies as if someone turned the key of...	View
	1994 Buick Roadmaster 5.7L Cuts out, Misfire VIN: 1G4BN52P5R AAAAAAAAAAAIIIIIEEEEEEEE This car is driving me nuts. At an idle the car does great, start to power brake it and above 1200 rpm it starts shaking and missing. After that it seems to miss all the time until it idles for a lil while. I replace the cap, rotor, w...	View
	1990 Cadillac DeVille 4.5L keeps running VIN: 1G6CD1337L customer states that sometimes engine continues to run after key off and removed from ignition. has stayed running from 1 to 10 min. after igniton off. vehicle has not acted up yet in the shop. just wondering if anyone has seen anything like this before. ignit...	View
	1992 Chevrolet K1500 Suburban 5.7L t.v. pressure VIN: 1GKEV16K6M i have a 700r trans that i just rebuilt. its back in the vehical. it shifts fair with a soft 2/3 up shift not a big concern could be better.with a pressure gage on the unit min.tv pressure is 75 psi in park,nuetral, od and man 3rd.pulling the tv cable to max p...	View
	1992 Chevrolet Astro CL 4.3L left front hydraulics VIN: 1GNDM15Z9N Hi gang! The owner of this fairly high mileage van asked me to simply flush the brake fluid. What he didn't mention until later was that he was hoping it would tkae care of this condition. He put pads in a while back with the help of a friend and since that ti...	View
	1996 Chevrolet Blazer 4.3L 4 wheel drive VIN: 2GNDT13W8T Customer states that vehicle goes into 4 wheel drive automatically when customer is going slow and turning, grinds real bad, hi and low button flashes on and off at the same time, transmission won't shift out of first gear, if you disconnect battery cures itse...	View
	1996 Chevrolet C3500 HD 6.5L clutch hydraulics VIN: 1GTHC33F7S when we stripped it down we found non oe clutch, compared it to an original clutch, found a difference in the pivot points for the springs, so thought we had got it rechecked everything measurements all very similar to old units so discounted wrong flywheel e...	View
	1997 Chevrolet Venture LS 3.4L r/r turn lamp VIN: 1GNDX03E1V During the light check, it was noticed that the right rear turn signal lamp does not function. The right front lamp flashes too fast, as does the lamp in the I.P. panel. Left turn lamps all work normally with the exception of the I.P. panel lamps. When moving ...	View
	1998 Chevrolet Corvette 5.7L wiper motor VIN: 1G1YY32G9W This car came to me with the wipers moving up and down going in and out of park with the switch off.The car owner said he had just had it washed when the problem started.I pulled off the wiper motor it was full of water,this is almost unbeliveabe based on the ...	View
	2000 Chevrolet Prizm 1.8L Lack of Power VIN: 1Y1SK524YZ Vehicle has a cold stall, lack of power when started cold. Not every time. Codes were cleared about a week ago. Have not come back. Has exhaust leak @ front pipe. Had to wait for clamp to come in. Will replace tomorrow. I didn't want to post until I had solved... Trouble codes: P0300 (Random Misfire), P0301 (Cyl 1 Misfire), P0302 (Cyl 2 Misfire), P0303 (Cyl 3 Misfire), P0171 (Fuel System Lean)	View
	2000 Chevrolet Impala 3.8L No Start VIN: 2G1WF55K8Y Hey All, This impala is not starting, it happened all the sudden for the customer. Customer drove car to store, when returned to car it would not start. Waited on tow and when tow truck got there it started. Customer drove home, and then next day started fine...	View
	2002 Chevrolet Express 3500 5.7L Poor Idle Quality, Cuts out, Stall, Misfire VIN: 1GBHG31R62 Have 3 of these 2002 Mini Busses (5.7 ltr Vortec) with the same problems. Is there a problem with the distributors or other common problems. Hard starting when cold. Cranks as if distributor is wet or has fouled plugs. All 3 started the same problem within 2 w...	View
	2003 Chevrolet Silverado 1500 4.8L odometer VIN: 1GCEK19V3E I have a 03 silevado wt, The problem that I am having is with the message center in the odometer window. The message to set the language to english - spainish or french will not stop flashing. This truck being a wt, has no steering wheel buttons, but it does h...	View
	1990 Geo Prizm 1.6L cooling fans VIN: 1Y1SK5460L After both engine cooling fans were replaced because they were burned out, the fans both stay on anytime the ignition switch is on. Engine has cooling and the condensor cooling fans since it has AC. Using the Shopkey wiring diagrams the circuits were traced. T...	View
	1999 GMC Jimmy SL 4.3L No Start VIN: 1GKCT18W6X truck has an intermittent no start. seams worse after the truck is driven and then sets for an hour. the problem occurs about every 2 days. finally got the truck to act up at the shop. found the fuel pump was not running. removed the fuel pump and tested for p...	View
	2001 GMC Yukon XL 1500 SLE 5.3L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1GKFK16751 O.K. folks did a trip prepare on wifes Yukon on June 28 so we could drive it to Virginia on the 30th, decided to flush the cooling system while I had it in, Day before we are sposed ta leave she calls and says check engine light came on while getting on hiway ... Trouble codes: P1639, P0332	View
	2002 GMC Yukon XL 1500 SLE 5.3L MIL Lamp on VIN: 3GKEC16Z62 i have searched all over mitchell repair, and all-data, cannot find any pinpoint test or flow chart for PO179, any help would be greatly appreciated. Trouble codes: P0179	View
	1990 Oldsmobile Delta 88 Royale 3.8L engine VIN: 1G3HN54C2L i replaced 1 injector, module, coil pack...could i have a bad new injector? i was going to install original injector i presumed was bad into a cylinder i know is working, then install that removed injector into the dead middle cylinder. if the cylinder does no...	View
	1999 Oldsmobile Silhouette Premiere 3.4L abs/tcs inop. VIN: 1GHDX03E0X Hi GM techs. Im in over my head on this one. I have this 99 olds van with abs/ tcs/ brake warning lamps on.I checked power and grounds and all seems ok, with key on eng. off. when engine is started, power from module that powers relay coil for abs/tcs, goes aw...	View
	1995 Pontiac Trans Sport 3.1L Lack of Power VIN: 1GMDU06D4S Hello Ihave this van giving me some trouble. Going down the road and up hills I have lack of power until I plug my Snap On scan tool in and go into data then i gain back my lost power, but once I get out of the data screen power is lost. Can anyone help? All ...	View
	1997 Pontiac Grand Am SE 3.1L Surge VIN: 3G1SB158RR i have two clients with the same vehicle that after the vehicle sits in the shop for say half an hour,when you start the car it will run normal for 10 seconds then it will start surging madly.sometimes it will stall. i hae=ve tried swapping everything i can t...	View
	1997 Pontiac Trans Sport 3.4L Cuts out VIN: 1GMDX06E0V Please offer something up if you have it. History was motor was run out of oil and knocked. Customer had reman motor put in at local dealership but it made some noise and they complained enough to get another motor put in. Original motor and first replacement ...	View
	1998 Pontiac Sunfire SE 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1G2JB5245W Engine stalls and stumbles and has strong emission smell even unhooked exhaust at manifold to check for converter blockage . Trouble codes: 0300 (random misfires)	View
	1992 Saturn SC 1.9L brake hydraulics VIN: 1G8ZH549ON this car does not have abs is power assisted but has no proportioning valve like service manual notes believe these cars use diagonal hookup on the frt. and rear wheels instead of prop. valve. never ran into any thing like this. not sure if i got a bad m/c or ...	View
	1997 Saturn SW1 1.9L Hesitation, MIL Lamp on, No Power VIN: 1G8ZH8283V Just replaced cylinder head with Saturn reman. due to oil in coolant. Vehicle runs fine until road test,has a slight surge and loss of power,replaced knock sensor,tsb on this. Made no change,spark advance fluctuates at idle from -13 to -25,at 2000 rpm it stays... Trouble codes: P0404, P0326	View
	2000 Saturn LS2 3.0L MIL Lamp on VIN: 1G8JW52R7Y Both P1779/P1780 appear to deal with comm. between ECM and TCM on the CAN network. Cannot find problem with PNP sw. inputs to either ECM or TCM. Have perfect continuity between ECM and TCM on tan and tan w/black wires(CAN network) No TCM codes, clear ECM code ... Trouble codes: P1780 (pnp sw./mil requested by tcm)	View
	2002 Saturn L200 2.2L noise VIN: 1G8JU54F42 Thanks for your time first. This car makes a high pitched (quite loud) whislting type nosie. It seems to come from the intake manifold area by clyinder #1. If i raise up the car and on a lift and lightly pry the bottom of the manifold up the noise changes tone...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1998 Buick Regal 25th Anniversary Edition 3.8L convertor lock-up VIN: 2G4WF521XW This 4T65e is shifting fine now, thanks to Brian, Bernard, Keith and Stephen for their input. As Brian suggested, I dropped the lower pan and checked for metal particles which would indicate a possible component breakdown and possibly debris in the valve body....	4
	1990 Cadillac DeVille 4.5L MIL Lamp on VIN: 1G6CD5331L Thanks to all. Codes are easily read. Cadillac has on board diagnostic code reading. To get codes press 'off' AND ' warmer' buttons on climate control at the same time. All segments of climate control and fuel data center will light up. Let go of buttons and...	8
	1995 Chevrolet Tahoe 5.7L abs. lite VIN: 1GNEK18K8S the fix for this 4wal system was using the snappy scanner with the multi plug adapter at H + A terminals . have lost faith in this cartridge for abs trouble shooting , [counting flashes ] the right front sensor would drop off any reading , replaced with new oe...	11
	1998 Chevrolet S10 LS 4.3L MIL Lamp on, CEL on VIN: 1GCCS19X1W Hi, Thanks for the responses. I failed to mention that the ABS,low fuel and brake lights would come on when I hooked up the scanner. However I had another GM that would not communicate today. Found out that my scanner software had taken a dump. Anyways the S10...	3
	1999 Chevrolet K1500 Suburban 5.7L Differential VIN: 3GNFK16R9X Thanks to all that replied, much appreciated, the problem was in the brakes, the holing springs were weak and letting the shoes move around too much also the backing plates were contacting the the drums but only when loaded, straightened the backing plates and...	8
	1999 Chevrolet Astro 4.3L Drive Train VIN: 1GNEL19W0X Well all i have to say is thanks for making me look again guys! Most all of you said tires were the cause and they were. One had been replaced with a new, very similar, tire of same brand and size, but not exact type. I missed it and feel a little dumber after...	7
	2000 Chevrolet Suburban 1500 5.3L Poor Idle Quality, Stall, Misfire, MIL Lamp on, Lack of Power VIN: 1GCEK142TX Hey Folks! Well I relayed your info to the other shop / tech and he is very thankful. According to him he investiagted all tips but they were not the problem with this vehicle. What I was told is that he compared the crank and cam sensor syn on his scope to a ... Trouble codes: P0300 (mis-fire), P0343 (Camshaft), P0101 (Mass Air Flow), P1870 (Transmission).	8
	2000 Chevrolet Express 3500 6.5L Surge VIN: 1GCHG39FOY thanks to the three responses i recived on this request the fix for this van was a new fuel driver module located on the side of the injector pump, not the easyest to change and very expansive about $900.00 parts and lab. but fixed the stumble off load. thanks...	3
	2000 Chevrolet Silverado 1500 5.3L Stall, PCM Fuse VIN: 2GCEC19VXY Thanks to all that replied. After taking your advise I searched the wiring diagrams and did find that that fuse does power the fuel pump also. Checked amp draw and found over 18 amps when hot. Never did blow the fuse for me but a new fuel pump was installed an...	5
	2001 Chevrolet Blazer LS 4.3L Transfercase VIN: 1GNCT18W71 The replies were pretty evenly split between the control module and dash switch. All wire connections were clean and tight and there was no water intrusion or corrosion. The switch was working properly every time. We feel this was a control module issue but ...	11
	2002 Chevrolet Malibu 3.1L caliper and mount VIN: 1G11NE52J5 creaking caliper assy. removed old assembly as per lots of replies andinstalled rebuilt caliper assy. noise gone and customer was just tickled pink. thanks dave	19
	2002 Chevrolet Silverado 1500 5.3L a/c tennsioner VIN: 2GCEC19T22 The customer chose not to fix this vehicle but we are satisfied that the compressor (and related parts) would have fixed this problem. Since this vehicle, we have had 2 identical late model GMs with the same problem. Both of them were repaired as per the TSB m...	15
	1993 Oldsmobile Cutlass Supreme 3.4L ignition module VIN: 1G3WH51X8P thanx to all who replied to help this problem was was a two fault problem when engine warmed up (after replacement of module) car would stall. replacing ck sensor completed fix.	17

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