GM Automotive Technicians Technical Discussion and Fixes for Jan 20, 2006

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Open Help Requests for GM

	Help Request	Answers
	1968 Buick GS 5.0L Wiring VIN: 446678B120 Hey everybody out there in "mechanic land?" Need a little help from some "old school" techs out there or whomever can help. Here's the situation. Had a 68 Buick GS that was brought in for I don't know what, but for whatever reason, the tech had to pull the d...	View
	1988 Buick Electra Park Avenue 3.8L Noise VIN: 1G4CW51C3J Thanks in advance for the help with this dinosaur. This car belongs to a real good customer and we have worked on it for years. Problem is when you hit a average size water puddle above 15 to 20 MPH you get a very unusual noise. Sound seems to be coming from u...	View
	1990 Buick Skylark 2.5L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Poor Fuel Economy, MIL Lamp on VIN: LM06275900 This is starting out to be one for the books. I have this skylark here and it is extremely weird. The problem is when you tip into the throttle it will start bogging down if you just hold at a steady light throttle it will continue to chugg and run alittle rou...	View
	1994 Buick LeSabre Custom 3.8L Hesitation, Stall, MIL Lamp on VIN: IG4HR52L9R I need help on this baby as it is driving me nuts. also with i renew a cam sensor but engine would not start with new cam sensor, put back old one but car start. Also with the new cam sensor tachometer on the dash is jumping up and down, as with old sensor it ...	View
	2001 Buick LeSabre Custom 3.8L Shaft or rack VIN: 1G4HP54K21 Noise seems to be in the rack or in the the steering shaft. I had it apart and could not feel any play in the slip joint or the u joints. Does it turning rt in any position. When you stop it klunks and kicks back. If you take weight off either wheel it goes aw...	View
	1988 Cadillac Seville 4.5L idles up and down VIN: 1G6KS5155J Trottle body is clean,no vac leaks,O2 is new,cat is new,got a reman ecm from chevy dealer,but that don't mean anything might just be a bad part,anyone seen this one?Also testing isc motor,connecter looks bad so I will find one. Trouble codes: 22 (TPS open)	View
	1998 Cadillac DeVille 4.6L will not start VIN: 1G6KD54Y7W starter was drawing 698 a before replacement and after only 142 a. now it is back up to 379 a the alternator tested good and the battery is good. the right rear window is not working ??? cables were good. the car can be jumped off and started, taken a mile dow...	View
	1992 Chevrolet S10 Blazer Sport 4.3L Rear Brakes VIN: 1GNDT13W0N I searched and found some information that was helpful, but have not nailed this one yet. We have been trying to fix the rear brakes for a long while. There are virtually no rear brakes. They are working very slightly, as I can see where the new shoes have be...	View
	1996 Chevrolet Cavalier LS 2.4L ABS modual VIN: 1G1JF52T4T Any ideas? After a routine brake job the brakes felt great. Two weeks later the vehicle returned with a soft pedal. We bleed the brakes, and the pedal returned to normal. Two weeks later same problem but we noticed when bleeding the ABS unit the air came out o...	View
	2001 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J61 heres one for you gm techs this malibu,when sitting overnight in cold weather will not start,have no spark and no pulse.after 5 or 10 minutes in the shop it will start right up.during the crank no start,all 6 injector ckts.on scan toll show faults.i assume thi...	View
	2001 Chevrolet S10 4.3L engine VIN: 1GCCS19W61 Hi This 4.3W has intermittent lifter noise on cold start after sitting overnight or 2-3 hrs but not evertime however the frequency of noise occurring is increasing and getting louder. Once warmed up noise goes away dosent come back with engine rpm so dont thin...	View
	2002 Chevrolet Cavalier 2.2L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1G1JC12432 Hello, This car has repeated injector failure on different cylinders. The failed injector is always stuck open. After you replace the failed injector, the car runs fine and has no problems that I can detect for about 1 week. Then the customer gets in to start...	View
	2004 Chevrolet Express 1500 4.3L Poor Fuel Economy VIN: 1GCFG15X24 This is my fathers vehicle. When he first purchased it he got 20-22 mpg on hiway and 18-19 in city. At about 15,000 miles the power loss light came on and he took to the dealer. They claim to have repaired a broken vaccuum line. Ever since his economy has drop...	View
	1997 GMC Jimmy SL 4.3L #4 gauge fuse VIN: 1GKDT13W8V Truck broke down out of town, another repair facility could not find the problem. replaced alternator. Removed complete dash board and short still happens. Apperently was dead short to ground when the other shop had it and short went away so they thought they ...	View
	1996 Oldsmobile Aurora 4.0L No Start VIN: 1G3GR62C3T Fellow techs,This Aurora is really beating me up!came in for extended crank when cold,once it starts it is fine rest of day,when warm outside prob is not their.I am concerned with the fuel pressure it has 30psi allthe time & spec is 45 to 50 psi. I have a moto... Trouble codes: P0707, P0101	View
	1998 Oldsmobile Bravada 4.3L MIL Lamp on VIN: 1GHDT13W2W This Bravada came in with P0446 code. We went through all tests that Mitchell had to offer. First it directed us to check the fuel tank pressure reading. It should read close to 0 in. H2O. Ours reads -7.50 at alltimes. Went through the wiring tests (checked fo... Trouble codes: P0446 (evap system vent valve performance)	View
	1999 Oldsmobile Alero GL 3.4L MIL Lamp on VIN: 1G3NL12E0X have po442 coming back over and over, smoke test shows nothing but once when tank was very full gas leaked out of gas cap when I put the smoke tester on it. Trouble codes: P0442	View
	2000 Pontiac Grand Am SE 3.4L service vehicle soon VIN: 1G2NG52E4Y looking for diagnostic code b2000 cant find any info from alldata. any info would be appreciated. also have code b2695 but i havent done any diagnostic yet. thank in advance. Lenny technician/owner	View
	2001 Pontiac Sunfire SE 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G12JB1244 Hey guys and girls, I need a little help I have 2 of these sunfires on our lot and they are both doing the same thing. I am not getting spark to cylinders 1 and 4 check engine light and code set set for random misfire. Traction control light comes on and stays...	View
	2002 Pontiac Grand Am SE 3.4L door locks VIN: 1G2NF52E62 This car has a problem with only the driver’s side door locking and unlocking with the switch. The other three doors only unlock with the switch. With the scanner hooked up the line showing idle does change from lock to unlock when using the switch. Everything...	View
	2002 Pontiac Grand Prix SE 3.8L Door locks VIN: 1GWP52K32F Costomer complains this car will unlock the doors on its own, the problem is intermittant and will happen at a stop sign or just driving down the road, dosen`t matter if the road is ruff or smooth. Also at the same time sometimes the onstar will flash lights o...	View
	2001 Saturn SW2 1.9L Poor Fuel Economy VIN: 1G8ZN84791 Hello to all. this saturn wagon came to us with the complaint of poor fuel mileage from 30 to 20mpg. used snap scanner & found codes. cleared codes & drove car 10 miles. retested for codes none found. coolant was low & seaping at t/stat. put in t/stat & new co... Trouble codes: P0326 (knock sensor out of range), P1599, P1620, P1624, U1000	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Buick Park Avenue 3.8L power seat VIN: 1G4CW54K7Y Thanks to the replies...The best one was from John in FLA, to manually adjust the motor by turning the worm gear by hand untill the driver is comfortable. If I had the time and the equiptment, I would build some way to repair this problem area. Thank you all. ...	3
	1994 Chevrolet Astro 4.3L No Start VIN: 1GCDM19Z6R OK, I was unable to fix this vehichle. The owner did not think it was worth going any further. I do have some information that could be useful. If you have good compression and you can rotate the crank back and forth and see that there is not excessive slop ...	30
	1995 Chevrolet K2500 Cheyenne 5.7L Hesitation, Stall VIN: 1GCGK29K4S I found it!!!.The hateful piece of shit!! After replacing the dist shaft and module,Ecm,2 fuel injectors I decided to go back to basics because I had obviously missed something.My tech had checked for voltage at the fuel pump with the fuel pump disconnected.BI...	31
	1997 Chevrolet Corvette 5.7L No Start VIN: 1G1YY22G4V If it looks like a duck, walks like a duck, & quacks like a duck, is it always a duck? In this case yes. Finally received a PCM that I could program and vehicle fired right up. Still not sure why a memory code would cause a no start. The comm. errors had me of... Trouble codes: P0601 (Internal control module memory check sum), P1518 (PCM to TAC module serial data).	5
	1998 Chevrolet Tracker 1.6L Check Engine Light VIN: 2CNBE136XW Our customer has not returned with his vehicle so I don't have a fix but several people suggested we clean the EGR passages and when he does show we will do that. It sounds like a great suggestion. Thanks for all your help. Trouble codes: P0400 (EGR Code).	9
	1999 Chevrolet Express 1500 5.7L Not sure VIN: 1GBFG15R5X Thanks for all the help. Larry from Az. said our specs were off on the pressures. Not sure where we got ours from but I believe your were right. Kevin from Mass said to replace it with the old style pump with the reservoir. We did this sense we had one laying ...	9
	1999 Chevrolet Lumina 3.1L No Start VIN: 1G1WL52M8X the problem was a WORN IGNITION CYLINDER itermittantly making contact WITH PALLET IN IGNITION KEY	19
	2000 Chevrolet Impala 3.4L no crank VIN: 2G1WF55E8Y Never able to duplicate no start condition. The dash issue we got fixed. All the dash tests performed with the Tech 2 only checked the gauges and some idiot lights. I borrowed a car and swaped the IPC to this car and the message center box in IPC came on. We s...	10
	2000 Chevrolet Express 3500 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall After replacing the injector coils-and poppets assembly it hesitated a couple more times but stopped after driving the vehicle holding the accerator to the floor and let off 5 times under load and it has run great since.	10
	2001 Chevrolet Impala 3.4L Accessories VIN: 2G1WF55E31 it was the bcm...sent it to a gm dealer and they installed a new bcm and it took care of all the complaints...thanks for all the replies...	12
	2002 Chevrolet Trailblazer LS 4.2L transfer case VIN: 1GNDT13S12 The customer has not returned, I have a pretty good idea of the problem I just need to get the vehicle here again and duplicate the problem. Thanks for the replies. Chris	8
	2002 Chevrolet Monte Carlo SS 3.8L programing VIN: 2G1WX15K72 We installed a new BCM properly programmed it and every thing is in proper working order. Thanks for all the help we really appreciate the input.	7
	1996 GMC K1500 Sierra SL 4.3L Hesitation, Stall, MIL Lamp on VIN: 1GTEK14W8T As always I hear good things about this site now I can attest to it.Most members seem to think that I should re-check fuel, and grounds, as well as pour over t.p.s. codes all good advice ,What I did find on this one was the ground integrity for the t.p.s. as w... Trouble codes: P0012, P1122 (t.p.s circuit open or shorted), P0300 (random engine misfire).	9
	2001 GMC Sierra 2500 HD SL 8.1L Cuts out VIN: 1GTHK24G61 I tried a suggestion from a fellow member that stated the crankshft position sensor could be slowly failing. I install a new one and it fixed the problem. The only thing is when you replace one of these becareful because it sits at the rear of the engine and i...	5
	2003 GMC Sierra 2500 HD 6.0L abs module VIN: 1GTHK29U53 we have completed our diagnostics, as the customer will probably not authorize repair, i am going to update the information to my original help request. after posting the help request, as we were waiting for information from alldata on the code c0055, i began ...	4
	1990 Oldsmobile Delta 88 Royale 3.8L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1G3HN54C0L Thanks again to everyone who took time out of there busy days to respond, it's appreciated!! A new pcm fixed this one, talk to the customer this afternoon, said it was running better than it has in a long time, with no MIL. Thanks and good luck to all those wh... Trouble codes: 21 (tps circuit voltage low), 22 (tps circuit voltage high).	9
	1998 Oldsmobile Intrigue 3.8L Starter VIN: 1G3WH52K0W replaced the key lock cyl assembly which includes the passlock sensor, so far all is good. thanks for all the help	16
	1996 Pontiac Sunfire SE 2.2L No Start VIN: 1G2JB124XT the problem was in the instrument cluster. sent it out for repairs after waiting 2 weaks got it back put it in the car re-learned system, car starts fine, thanks for those who replied.	9
	2001 Pontiac Grand Am SE 3.4L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1G2NF12E41 After buyig another used plenum I was bound and determined that this one would not crack. The tech had used rtv on the lower part of the gasket and had 'glued' it on resulting in a less than smooth surface. We cleaned off all the old rtv and replaced the gaske...	3
	2001 Pontiac Sunfire SE 2.2L fuel gauge inop VIN: 1G2JB12441 wires from tank unit to ecm had been spliced in several locations. both wires were purple. one was for the gas gauge and the other was for class2 serial data. they were crossed at the ecm! now we had the proper amount of ref voltage going to the tank unit and ... Trouble codes: P0463 (fuel level sesor high / open).	6

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