GM Automotive Technicians Technical Discussion and Fixes for Jan 26, 2005

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Open Help Requests for GM

	Help Request	Answers
	1992 Cadillac DeVille 4.9L Hesitation VIN: 1G6CD53B8N Fellow Cadillac Techs, problem occurs from idle to 3500, in gear, under load, car feels very sluggish( eg.sticking brakes) no power to move itself from a stop, did this before transmission overhaul. all parameters on data stream are within spec, no codes in dr... Trouble codes: 61 (Pump motor test problem ABS)	View
	1994 Cadillac Seville STS 4.6L engine VIN: 1G6KY5299R just need to now one bit of info if any body knows.i have a customer that wants to put a used engine in his caddy.the engine it has is a vin 9 4.6l and he wants to put a vin y 4.6l in its place.the only difference in the motors is the vin 9 is a higher output ...	View
	1994 Cadillac DeVille 4.9L Mechanical VIN: 1G6KD52B2R The car makes a loud metalic knock random/intermittantly from inside the transmission. Sounds like a hammer striking the inner case with various intensity. It occurs when revving up the engine (+2000 rpm) in park or while operating under normal driving conditi...	View
	1990 Chevrolet R1500 Suburban Silverado 5.7L speedo VIN: 1GNER16K9L i have not had any luck in locating the drac(digital ratio adapter controller) unit on this vehicle. i have exhausted my resources(alldata and mitchell). the information that i have recieved is for the late body style.i am posting this in hopes that someone ha...	View
	1994 Chevrolet C2500 Cheyenne 6.5L MIL Lamp on VIN: 1GCHK33S2R Truck originally came in with an intermittent stalling and a MIL lamp on. Fuel solenoid driver repaired stalling. Have followed procedures in Mastertech and Mitchell to reset and change offset. Code sets immediately. Truck runs fine. Can not cure code 88. Trouble codes: 88 (TDC offset error)	View
	1996 Chevrolet Monte Carlo LS 3.1L Poor Idle Quality, MIL Lamp on VIN: 2G1WW12M9T When I got this vehicle I was told that it failed the emmision test and that the mil was on. Scanned for codes, none found. While observing scanner data I noticed that the idle did not want drop below 1300rpm and if you tried to control the IAC the rpm would o... Trouble codes: P0171 (bank 1 lean)	View
	1996 Chevrolet Blazer 4.3L engine VIN: 1GNCS13W1T customer came into shop stating engine would not shut off. the only way to shut engine off was to pull the number 2 fuse. after replacing number 2 fuse with ignition switch in off postion all dash lights come on and fuel pump activates.you can then turn key to...	View
	1997 Chevrolet K1500 Cheyenne 5.7L MIL Lamp on VIN: 2GCEK19R7V this vehicle was in our shop 1yr ago and replace engine with jasper reman came back few weeks later and found bad #7 and #8 injectors - replaced injectors - came back 1 month later and found #5 injector weak - had miss fires and those cylinders - truck came ba... Trouble codes: P0300	View
	1997 Chevrolet Cavalier Z24 2.4L timing chain VIN: 3G1JF12T7V a few days cust returned with noise sounding like timing chain,tensioner problem rebooked a few days later to check out noise.car ran in the shop for 90 min after cold start in -12 c and test drove after not a tick or a noise out of it.pulled car in for courte...	View
	1997 Chevrolet K1500 5.7L Misfire, MIL Lamp on Hello to all the great Techs out yonder, I have a very unusual problem with this "generic" farm truck. Excuse me for not listing all of the tests done but maybe some one has seen these symptoms. I just recently replaced lwr gaskets for leaks, r+r 2 lifters for... Trouble codes: 0300 (multiple cyl misfires)	View
	2000 Chevrolet Cavalier 2.2L no start VIN: 1G1JC1248Y car came in as a no start. has good spark, fuel psi per specs, int injector pulse. car will start and run for about 10 seconds then die. at that point it looses injector pulse .it will do this as many times as you want to always the same results.it has no secu...	View
	2000 Chevrolet Silverado 2500 6.0L No Start VIN: 1GCGK24U7Y I have a customer that was complaining about hard to start silverado. Last week was 10 degrees or lower and he said it would eventually start but would have to try it about every 20 minutes or so. He brought it over and was below 0 the first night, next morn...	View
	2001 Chevrolet Silverado 1500 4.3L Unknown VIN: 1GCEC14W91 Hello Techs , trying to help out my brother in law that lives in Houston. When coming to a stop and releasing the brake there is a loud clunk you can feel through out the truck. Twice he has been back to the dealership with this problem. The Gm rep said this i...	View
	1997 GMC K1500 Sierra SL 5.7L steering wheel VIN: 2GTEK19R7V This truck came into our shop because the customer wanted us to switch the tire from black wall to white letter. We flipped the tires around, balanced them and put them back on the truck. Customer comes back and says there is a shake in the steering wheel at a...	View
	1997 GMC Safari SLE 4.3L No Start VIN: 1GKDM19WGV this safari van came in on the hook with a cranks, wont start problem. checked battery and cranking speed-good. pulled engine cover and checked for spark-good. checked for fuel pressure--failed. pressure at 30psi, needs 50 or more to start. my tech sprayed sta...	View
	1998 GMC Safari SL 4.3L steering VIN: IGKDM19W9W customer complains about a wandering steering at high speeds. he always has to correct the steering while driving. we have replaced idler arms in the front end and a power steering pump. we have checked the front end and there is no play in anything. cannot ta...	View
	1997 Pontiac Grand Prix SE 3.8L abs VIN: IG2WP12KXV thank you to all in advance . abs light comes on & red brk light , but not all the time . code c1261 rf motor circuit open / history code of c1251 rear axle nut fail mtr free spins . checked for gears stripped on bottom of motor pack , all ok & none of the nut...	View
	2001 Pontiac Montana 3.4L Accessories VIN: 1GMDX03E51 hi techs i`m hoping someone has had same problem . this montana started acting up after nasty snow storm - fuel gauge reads full when empty . when the tank gets to about half the fuel gauge starts to go back to full as level drops in tank . also rear wiper wil...	View
	1997 Saturn SW1 1.9L No Start VIN: 1G8ZG8285V Car came in for hard start 1ST time in am once started was ok rest of day. Vehicle cranks no start, no spark, very erratic injector pulse, when first scaned computer had 32 codes cleared they came back! Got pcm from junk yard and replaced crank sensor because ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1987 Buick Regal Limited 3.8L reverse VIN: 1G4GM11A2H Thanks to all who took the time to reply. I had several that said the same thing. There is a small rubber seal in the case between the valve body and the low and reverse drum. When you remove and install the drum, you tear the seal. I am used to 4L60E's. I did...	15
	1991 Buick Regal Gran Sport 3.8L Excessive Emissions, Surge, Stall VIN: 2G4WD54L7M all right after woring on this 'sucker' sor two days and with the help of the IATN support group we got this baby licked!!! first off thanks to all who answered my request. The problem was with the MAF sensor wiring. somone had stripped the wiring back to chec...	15
	1987 Chevrolet Caprice Classic LS Brougham 5.0L part lost VIN: 1G1BU51H9H The lost part measures .190' dia. and .730' long and it is coated with teflon. The final length is not super critical because you need to adjust the TPS anyway. Some of you said it came with a new TPS, (but not the one Standard sells, however, I already had on...	17
	1988 Chevrolet Celebrity 2.5L Poor Fuel Economy, MIL Lamp on VIN: 1G1AW51R2J thanl you everyone. the ecm was the problem. I checked the aldl connector and it appeared i have the correct voltage and a proper ground but, the computer would not let me in to scann the computer. i replaced one from a junkyard and swapped out the prom chip i... Trouble codes: 12 (i can only get this if i use a jumper wire).	14
	1988 Chevrolet C1500 Cheyenne 5.7L No Start, Stall VIN: 2GTDC14K6J Well this truck finally seems to be fixed. I've driven it for three days now.Most replies said to change the dist. shaft. I changed the hole dist. still had the same problem.Thanks to Bruce [...] I when't back to basics. Even though I had checked all the grou...	25
	1995 Chevrolet S10 2.2L Hesitation, Surge, Cuts out VIN: 1GCCS1442S thanks to all who helped.i found that the cat. converter was restricted when the vehicle was at normal operating temp.at cold temps, there was plenty of exhaust.i replaced the cat. converter and i have full power like it should.thanks again. john	5
	1997 Chevrolet Blazer 4.3L 4 wheel driv VIN: 1GNDT13W9V The problem was ground up splines in slider assembly. The fix was easy with all your help. I got 12 replies all with good ideas and gave me some insight on this system. Thanks Ryan	12
	1997 Chevrolet Blazer 4.3L Drive-axles VIN: 1GNDT13W9V Some reason I sent this help request twice. The problem was ground up splines in slider assembly. The fix was easy with all your help. I got 12 replies all with good ideas and gave me some insight on this system. Thanks Ryan	10
	1998 Chevrolet S10 LS 4.3L No Start VIN: 1GCCT19W5W I've had many replies about c.t.s and t.p.s. voltage. Coolant temp. and i.a.t temp within 10 deg. of outside temp. T.p.s. voltage .47. I tested a sample of fuel and had less than 5 percent alcohol, specific gravity was very heavy and it had a very yellowish ti...	23
	2000 Chevrolet K3500 7.4L MIL Lamp on VIN: 1GCHK34J6Y This truck did not get fixed. All replies were tried and retried. This truck beat the fool out of me. By lowering fuel pressure to lower end of specs we were able to keep the no.s down slightly but not enough to keep it from flagging a p0175. next trip would b... Trouble codes: P0172 (Fuel trim system rich bank 1), P0175 (Fuel trim system rich bank 2).	17
	1995 GMC G3500 Vandura 5.7L Excessive Emissions, Poor Idle Quality, Stall, MIL Lamp on VIN: 1GTFG35K2S many thanks to schurch, dave, al's auto, shawn, kenneth, b2b1. input they gave was great. can never have to much, the fix was a stuck valve on #3 cylinder. again thanks to all of you so much. maybe my hair will grow back. thanks, rusty Trouble codes: 34 (map high voltage).	9
	1996 GMC C1500 Sierra SL 5.7L Misfire VIN: 2GTEC19R3T We went back over everything agin to cover all the bases and it ended up being the lower intake gasket. Third time was the charm. We used Fel Pro's new and upgraded gasket part#98000T and it did the trick. Thank you very much for all the help, everyone is very...	31
	2001 GMC Savana 1500 5.7L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1GDFG15R91 I was hoping to have this fixed before I closed this post. The van went to the dealer to have a PCM installed and that didn't help either. It is back to me now and I have 'thrown Parts' at it with no help(MAF,MAP,CKP,Distributer w/ cap and rotor OE). I am abou...	26
	2000 Pontiac Bonneville SSEi 3.8L Surge VIN: 1G2HZ5416Y After long time spent reviewing scanner snapshots I found that when the surge was occuring the TCC duty cycle was cahnging up and down almost like the PCM was cammanding the surge. I reflashed the PCM in attempt to reset all the transmission adapts. I drove th...	9

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