GM Automotive Technicians Technical Discussion and Fixes for Oct 1, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1989 Buick Century Custom 3.3L Misfire VIN: 1G4AH51N4K This thing has a misfire, worse on cylinder #2 but somewhat reflected on #5 (companion cylinder but seems to share nothing else but the coil). I feel a little stupid that I can't figure this thing out. It seems to be lean on #2 and the O2 waveform cycles at 5....	View
	1971 Chevrolet Corvette 350CID wipers VIN: 194671S104 Help. We are looking for a wiring diagram for the wipers. The switch appears to work and so does the wash part of the system but we do not know the specs of the three wires at switch or where the ground is at. Currently there is 12v at two wires on motor with ...	View
	1992 Chevrolet Blazer Cheyenne 5.7L No Start VIN: 1GNEK18K4N Hi guys Have an interminent problem starting this beast. At times during crank will have injector pulse but no spark. Negative lead at coil is flat lined at battery voltage when this happens. Disconnecting four wire lead at distributor will give me spark ever...	View
	1995 Chevrolet Cavalier 2.2L abs/sir VIN: 1G1JC1244S i can comm. with everything until i start the car. then i loose comm. with the ebcm and the sir mod. when you put car in gear the brake/abs light and air bag light comes on. the also come on sometimes when you turn the light switch on the column on and off a c...	View
	1995 Chevrolet C1500 Suburban 5.7L a/c compressor VIN: 1GNEC16K6S Vehicle came in with awful sounding compressor and no cold air. Installed new aftermarket compressor, accumulator, evaporator, and oriffice tube. Flushed condensor. Compressor was a little noisy from the start and after a month customer requested new unit whil...	View
	1997 Chevrolet C1500 4.3L Poor Idle Quality, HIGH IDLE VIN: 1GCEC14W9V vehicle idles ai 1100 and has new iac and no problems found	View
	1997 Chevrolet S10 4.3L Unknown VIN: IGNDT13WIV This lady bought this as a repo. She has had it for several months. Fuel gauge didn't work - fixed it right away. She brought it in a couple of days ago with a ( as she put it ) funny noise under the hood. It is very intermittent and sounds like a gurgling - s...	View
	1998 Chevrolet C3500 Cheyenne 7.4L Excessive Emissions VIN: 1GBKC34J1W okay here you go guys and gals. i have this truck. it came in for a state emissions test. this truck failed for excessive hc at idle. i have replaced both upstream o2 sensors. checked all 8 plugs. gap was god and plugs looked ok. ignition system looks ok. has ...	View
	1994 Pontiac Trans Sport 3.1L Speedometer VIN: 1GMDU06D3R Im new at this so please bear with me.We have an interesting situation - a 1994 Transport came into us that needed a transmission.I purchased one from a reputable local salvage yard & installed it.All was well- no leaks,road tested out great- customer was very...	View
	1997 Pontiac Sunfire SE 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1G2JB524XV Hey guys this one has got me. It came in on the hook from another shop. The car has no power missfires on all cyls. It blows black smoke and has codes for multible misfire and running rich. The car has a new ignition module, coils ,crank and cam sensors. We ch...	View
	1997 Pontiac Grand Prix GT 3.8L ABS Warning Light VIN: 1G2WP52K7V After replacing a leaking steering rack assembly on this 97' Grand Prix with a AC/Delco rebuilt unit, the ABS light came on and off intermittently a couple of times during the road test and now stays on all the time. At first I hadn't adjusted the toe-in when ...	View
	2000 Pontiac Grand Am GT 3.4L 1336 VIN: 1G2NW12E5Y car came in with no headlights and no a/c, we repaired shorted wiring and replaced bcm,, we now have a code 1336 when we try to run the relearn procedure our modis locks up at the beginning of the test or it just keeps flashing, waiting for full throttle, does... Trouble codes: 1336 (ckp variation relearn)	View
	1995 Saturn SL1 1.9L No Start VIN: 1G8ZG5280S Hello all Basically when the problem occurs, the engine has spark, has fuel & injector pulse but no cranking RPM on the scanner. Our MODIS shows the crank sensor generating a wave form but not a very good one (compared to the example shown on the scope). Anot...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1982 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1AY0782C All the suggestions I received were greatly appreciated. The fuel pump and filter were recently replaced, the MAP sensor was properly functioning, the oxygen sensor was also OK. The fix was to rebush the throttle shafts on both throttle bodies. Thanks again fo... Trouble codes: 44 (lean exhaust).	15
	1997 Chevrolet p chassis 454CID engine VIN: 1GBLP37J4V Thanks for all the great suggestions as to how to get this thing out, still waiting for customer ok (the motor alone is $4500) so I think he is saving some money. Anyway I've done a partial teardown pulled condensor and rad. After careful measuring this will c...	11
	1999 Chevrolet C65 3126CC alternator VIN: 1GBJ6H1CXX thanks to all that helped,bob [...] said they see worn brushes. the problem was one brush wire was broken,install new brushes and all is well. dale.	3
	2000 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS1451Y Hi,Finally I got this one fix,after fllowing the good information from,Robert,Michael and Richard they lead me to replace again the knock sensor,installed a GM P#1045209 and drove it few times and the MIL never came back,sent the truck to customer and the driv... Trouble codes: P0325 (knock sensor circuit).	4
	1999 Oldsmobile Intrigue GX 3.5L scan data VIN: 1G3WH52H5X sorry for the late close, but we wanted to be sure car was fixed. in short, we were loosing class 2 serial data to the scanner. you are supposed to eliminate each module one at a time, by unplugging each, serial data is a 0 to 7 volt signal, you are to watch f... Trouble codes: P1602 (serial data failed between pcm and etc module).	4
	1994 Pontiac Firebird Formula 5.7L crank pulley VIN: 2G2FV22P1R Thanks very much to all who replied. The hub on this vehicle really requires a special puller that goes all the way inside of hub and bottoms on the crankshaft. You can use a regular balancer puller by installing an appropriate bolt that will bottom in the hub...	17
	1995 Pontiac Grand Prix SE 3.1L Unknown VIN: 1G2WJ12M6S well, thank you to everyone who replied all the help was greatly appreciated. Replaced pcm still no fix. So we replaced the transmission with another gm reman. Works great. My assumption is that the tcc solenoid was not working properly. I just wouldn't have t...	6
	2001 Saturn SL2 1.9L No Start VIN: 1G8ZK52751 hi, looks like its fixed, so far so good. i recieved some good responses, thanks to all. a few said bcm, one pointed out a connector on the back of the inst cluster, another a weak spot in a bulkhead connector behind the center console. one said a dirty batter... Trouble codes: U1300.	11

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