GM Automotive Technicians Technical Discussion and Fixes for Mar 23, 2005

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Open Help Requests for GM

	Help Request	Answers
	1987 Buick Electra Park Avenue 3.8L hard starting VIN: 1G4CW5133H I'll try to make it short, but give as much info as possible. On about 80% of the start-ups the engine will act like the timing is way advanced, with a backfire in the intake. Another tech bought the car with this problem an has replaced the items listed in th...	View
	1987 Buick Regal 5.0L engine VIN: 1G4GJ11YXH i drove this car over 950 miles home, no engine noise, now, i start up car, quiet while cold, once warmed up,at about 1500-2000rpm, i hear a noise simuliar to that of bearing noise? i replaced fuel pump with new ac delco, i ran engine with all 4 belts removed,...	View
	1994 Buick LeSabre Custom 3.8L alternator VIN: 1G4HP52L4R This Buick has a no charge condition. It has the single trigger wire to alternator regulator plug. Unplugging connector at regulator and feeding 12 volts to regulator terminal, alternator turns on and charges at 14.7 volts. Voltage at trigger wire measures 2 v...	View
	2000 Buick LeSabre Custom 3.8L Jerks in to reverse and to drive when cold VIN: 1G4HP54K1Y Symptom: when first starting car when cold going from park to reverse it jerks pretty bad and also when shifting in to drive it's almost like the motor mounts our bad but they look fine. After car is warm is works good. I would like to know if any one has had ...	View
	1976 Cadillac Eldorado 8.2L No Start VIN: 6L6S602420 i have narrowed the problem down to a bad coolant temp sensor and bad throttle position sensor. am not sure if this is the correct forum, but i cannot locate these parts anywhere...anyone have any ideas? this car is dead in the water without them. any help wou...	View
	2001 Cadillac DeVille DTS 4.6L lights and power acc's, no crank VIN: 1G6KF57941 car driven into shop by customer complaining gauges on nstrument panel went out. in shop when engine was turned off car when tried to restart would not crank and none of the accessories would operate. when connecting otc genisys it could not communicate with a...	View
	1972 Chevrolet pickup 350CID electrical Hi all, I am in DESPERATE need of a electrical diagram that includes a GAUGE instead of light for the charging system. All diagrams I have come accross have a light.	View
	1992 Chevrolet Corsica LT 3.1L Stall VIN: 1G1LT53T7N I now have a 1992 Chevy Corsica on the lot. This vehicle has had a complaint of an intermitant stall. The first few times I test drove the vehicle, I hooked up the scanner and drove and drove. I could not seem to reproduce the complaint. Only one time did it a...	View
	1993 Chevrolet Lumina 3.1L No Start VIN: 2G1WL54T2P Car came in 2-months ago on hook W/blown ECM/fuel pump fuse. Replaced fuel pump and fuse. This lasted untill a week ago, blown pump fuse. Replaced relay and oil sender. This lasted one day. Car has never died. It has happened both warm and cold. The only warni...	View
	1995 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W5S Hello All, This Blazer wont start, has spark and good fuel pressure. It has no fuel injector pulse. Replace VCM with used part started right up for about 1 minute then died...seemed like it was running rich. Retested found no injector pulse again. Started pull...	View
	1995 Chevrolet Astro CL 4.3L Poor Idle Quality, Stall VIN: 1GNDM19W7S I have tested all that i know that i can. It just seems to stall out and die when it get warm. If any of you can help that would be great.	View
	1995 Chevrolet Cavalier Z24 2.3L Poor Idle Quality, Misfire VIN: 3G1JF12D0S Hi, thanks in advance for any help. This vehicle came in with MIL on and idle surging real bad. We pulled codes, Multiple misfire, replaced tune parts, and have same problem. Found out from customer that his neighbor replaced head & timing chain due to chain ...	View
	1997 Chevrolet P30 BUS 7.4L park brake VIN: 1GBLP37NXV Had replaced the auto park pump and actuator (both had major fluid leaks and no park brake function). Now I have park brake function but suspect there is still some type of problem. . . If the manual park brake is applied, the park brake light comes on and s...	View
	1997 Chevrolet Blazer 4.3L Hesitation, Misfire, MIL Lamp on VIN: 1GNDT13W0V Customer brought vehicle to us with a complaint of no power. Vehicle boggs down under load. checked for codes and found po100, po300, and po420. checked MAF sensor operation and found B+, referance and activity to be ok. checked fuel pressure and found that to... Trouble codes: P0300, P0420, P0100	View
	1998 Chevrolet Malibu LS 3.1L right axle? VIN: 1G1NE52M9W hi guys i have a 98 malibu with a popping cracking noise coming from passenger side axle, when you turn the wheel hard to either side and let the car roll . clunk can be felt by putting your hand on the center cap of the rim .when i replaced the front axle i n...	View
	1998 Chevrolet Astro 4.3L No Start, LONG CRANKING VIN: 1GNDM19W1W cranks way to long and it won't kick over untill the 4th time when mid or normal temp kicks on second time...psi residual stays, resitance 11.7-12.0 on injectors and computer is pulsing all six...	View
	1999 Chevrolet Tahoe LS 5.7L clunk VIN: 1GNEK13RXX Hey Guys, This is a 99 chevy tahoe 4x4 with a 5.7 votec with auto trans. This truck clunks hard when coming to a stop and clunks on acceleration from a stand still.Does not have any other problems what so ever.The clunk is coming from the drive line via trans ...	View
	1999 Chevrolet C1500 Suburban 5.7L shifting VIN: 1GNEC16R6X Customer had trans overhauled 8 months ago. Came in hard shifting and leaking fluid everywhere last shop said warranty only 6 months. We ordered him a reman from accurate transmissions 4L60E it lasted 3 days and he brought to us slipping and the trans making a...	View
	2000 Chevrolet S10 2.2L calipers/vacuum booster VIN: 1GCCS1443Y The customer's complaint was a soft/spongey pedal effort. The tech found an obvious condition in the front brakes. The rotors had rusted and worn to a point allowing the pads to wear over the outer circumference of the rotors. This caused an unevenly pad surfa...	View
	2000 Chevrolet Blazer LS 4.3L Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13W4Y Owner complains of rough run and poor fuel eco. When I scan trim after driving a while they appear normal values less than 5% both banks. but when I WOT once or twice the B1 values go to 50.00% and will not come down untill you drive for a while. All plugs/ign... Trouble codes: P0171 (lean b1), P0300 (random missfire)	View
	2000 Chevrolet Astro 4.3L MIL Lamp on VIN: 1GNEL19W4Y hi guys i need some help with this one. i have a po325b code that is there all the time. when i checked the voltage at the sensor i had 5 volts thought ok simple needs a sensor wrong!I installed the sensor dropped scan tool voltage to 4.85 volts i found an inf... Trouble codes: P0325	View
	2000 Chevrolet Silverado 1500 4.8L Poor Idle Quality, Hesitation, Surge, Stall, Misfire, MIL Lamp on, LONG CRANK THENSTART VIN: 1GCEK14V3Y ok guys her s what we got have a 2000 chevey that startes hard if u leave it sit for a coulpe hours it will crank for ever then it starts right up we have the advantage from snap on just got it up dated to do coil over plug and guess what it didnt help us at a... Trouble codes: P0300	View
	2001 Chevrolet Lumina 3.1L starter VIN: 2G1WL52J01 hi i have a 01 lumina no power to purple wire at starter have checked fuses and grounds all ok security light flashes,no power at purple wire at theft deterrent relay i have 12v at other wires at relay i have power to theft module and 5v reference signal on bl...	View
	1997 Hummer H1 6.5L Stall VIN: 137ZA8432V the engine will just die (not sputter/die), and it's happening about 2-3 times a week.	View
	1998 Oldsmobile 88 Royale 3.8L Mechanical VIN: 1G3HN52KXW hi guys , I have this 98 oldsmobile 3.8 engine that haves engine noise . whats wired about it is when you take the oil cap off the noise go away. the sound you hear is like a whiny noise. when you put your hand above the oil cap opening you feel alot of vacume...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Buick LeSabre Custom 3.8L warning systems VIN: 1G4HP54K1Y Hi this one quit actng up so it went down the road unrepaired. I had three replies-Aran from Utah said to check cluster wiring paying close attention to power/ground/class 2 data wiring. Douglas from Ontario said that he has seen a similar problem caused by ba...	3
	2001 Buick LeSabre Limited 3.8L Battery draw VIN: 1G4HR54K71 Hello Group---The IPM module was finally found!!! All Data had it located to the left of the steering column. However, some of the other pigtails that were numbered on the diagram were shown to be right of the glove box on the locater for wiring connectors. No...	8
	1997 Cadillac DeVille 4.6L Heater Core VIN: 1G6KD54YXV Thanks for all the replies I received. I replaced the heater core with a new one. I ground the engine to the frame and the engine to the firewall. I flushed the system. The car still has a TCC code, but he was not willing to spend any more money on the car. I ...	11
	1965 Chevrolet corvette 327CID washer pump VIN: 194375S120 Thanks to all who responded, I appologize for forgetting name of individual that said to just push down on plunger and rotate, it popped right off. The plunger is attached to a bladed end of the rod and a 1/4 turn locks it onto the rod. No disassembly of the w...	4
	1967 Chevrolet Camaro 350CID steering box VIN: 124677N139 Hi and thanks to all that replied to my question. We've decided to install an aftermarket performance power steering box. Right now we're leaning towards the AGR box because of their good reputation and because we can get one in a day or so. The price seems ve...	9
	1988 Chevrolet Astro 4.3L No Start VIN: 1GCCM15Z4J Most of the replies were that the fuel pump might be bad, well most were right. Thank you all.	23
	1994 Chevrolet Lumina APV 3.8L temperature control VIN: 1GNDU06L9R Well it appeared that the heater control had an intermittent failure which caused the temp door actuator to go to cold at times. We replaced the heater control with a used one and now it seems to work ok. Thanks everyone.	7
	1995 Chevrolet Monte Carlo Z34 3.4L maf,iat,02 VIN: 2G1WX12X7S replaced intake manifold gaskets runs like a champ thanks everyone	22
	1999 Chevrolet K1500 Suburban 5.7L dome light VIN: IGNFK16R3X thanks to all that posted help to me. ordered pass side switch and replaced . lights work as they are supposed to and customer (my wife) is happy thanks again mark	6
	1999 Chevrolet Camaro Z28 5.7L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 2G1FP22GSX The insurance company allowed us to comince on inspecting further. Found that the rocker arm stud was defective. problem is being repaired. Thankyou to all the members for there good information. With the information that was provided, it helped in repairing a... Trouble codes: P0300 (Random Misfire).	12
	1995 GMC Safari 4.3L case thank you all for the input. You gave me several ideas of things to check. The customer can't bring the van in untill 04/11 so I thought that I would go ahead and close this help request. Thanks again!	11
	1995 Oldsmobile Silhouette 3.8L steerig wheel radio controls Local radio repair shop said to bring in an example, but I had to reassemble the part to use the van.Now that i know how it looks ill check radio shack. d	4
	1995 Pontiac Sunfire SE 2.2L Excessive Emissions VIN: 41SS839546 Well I pulled off the egr/thermostat houseing of the side of the head to make sure it was okay and no leaks. It was okay. Although it runs pretty good, (little ruff at Idle) I decided to do a leak down test. I found #1 cylinder has a burnt exhaust valve. I hav...	13
	2003 Saturn Ion-3 2.2L Poor Idle Quality, Misfire VIN: 1G8AL52F83 i appericate everyone writing back so promptly but the customer was allready upset that we had the car for 3 days and decided to take it to the dealer. we did a leakdown test and the none of the valves were leaking, plus we put a know good map sensor and still...	4

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