GM Automotive Technicians Technical Discussion and Fixes for Jul 7, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Buick Park Avenue 3.8L Poor Idle Quality, MIL Lamp on VIN: 1G4CW52LTR This car came in for the check engine light being on. The customer also mentioned that the car would stall when going done the highway mainly when the fuel tank is about a quarter of the way full. When I hooked the scan tool up to the car I first got codes PO1... Trouble codes: P0131 (HO2S Low voltage), P1640 (QDM 1 Error), P1670 (QDM 4 Error), P0122	View
	1997 Cadillac DeVille 4.6L Theft System VIN: 1G6KD54Y0V Customer inserts key and gets no crank, instrument panel message says "wait 3 minutes before starting", waits 3 minutes and car will usally start, also message will come up intermittingly that says "car may not start" . We have found the 2 white wires that com...	View
	1998 Cadillac DeVille 4.6L blower motor VIN: 1G6KD54Y7W Good afternoon everyone. I have a 98 deville that i agreed to work on for a local car lot that sends me alot of work. the problem is that i dont do american cars and have no wiring diagrams or troubleshooting for this model. The blower motor is not working. Th...	View
	1989 Chevrolet Corvette 5.7L No Start, HOT ONLY VIN: 1G1YY3180K this one is beating me up. 89 vette. runs good other than slight rough idle. once hot, it will not restart even 10 seconds after shut down. while running all sensors are in range. tps-maf-o2-ipw-etc. when it cranks it has spark with correct timing, injector pu...	View
	1992 Chevrolet S10 2.5L Hesitation, Surge, Cuts out, Misfire VIN: 1GCCS14A6N The Truck Idles Ok,But When You Take Off under lite load It feels like a dead miss or Even like its running out of Gas but once you get up to speed you dont feel it as much then on decl every once and awhile youll get a back fire out the exhust. Trouble codes: 25 (Mat Readings Are Very High Around 200 Deg)	View
	1993 Chevrolet Corvette 40th Anniversary Edition 5.7L tcc VIN: 1G1YY23PSP Unfortunately, I need help with MY car! The converter was intermitantly not applying. I scanned the system and thought electronicly it was working so I expected just a faulty solenoid. While I was waiting for the opportunity to install the new part, my car is ...	View
	1996 Chevrolet Astro 4.3L Hesitation, Stall VIN: 1GNEL19WXT van has hesitation,worst cold, almost gone when hot.step on gas any degree from a crack to wide open and it falls on its face and pops out intake.o2 sensors go very lean for a split second as problem occurs. flushed injectors with no improvement.	View
	1997 Chevrolet Express 3500 5.7L brake bleeding VIN: 1GBHG31RXV Hello, This vehicle came in with a blown left rear wheel cylinder. We replaced both wheel cylinders and shoes. We are unable to get fluid to the rear wheels. We have fluid to the ABS unit, but not after it. We tried gravity, manual, vacuum, and pressure bleedi...	View
	1998 Chevrolet K2500 Cheyenne 6.5L No Start VIN: 1GCGK29F2W Hi there hi tech people, Customer brought this truck in on a hook. The starter had stuck on taking the batteries and cables with it! We replaced all the aforementioned as well as an ignition switch and starter relay. Went for an initial start before buttoning...	View
	1999 Chevrolet Tahoe LS 5.7L No Start, Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1GNEK13R9X Hi all, thanks in advance for your help. This one has us stumped. Customer complaint was hard start, when it did start it ran rough until operating temp was reached. Check engine light came on, the only code is P0300, random miss fire. We had the truck over ni... Trouble codes: P0300	View
	2000 Chevrolet Suburban 1500 LT 5.3L srs air bags VIN: 3GNFK16T2Y Hello, I have this suburban with the srs light on and indicating a code b0041(driverside deployment loop open.)I have the gm flow chart for diag but no wiring diag. At this time I have tested wiring from SDM connectors to driver door module, connector under dr...	View
	2000 Chevrolet Suburban 2500 LT 6.0L compressor VIN: 3GNGK26U8Y The AC compressor got so hot that the clutch and the switch in the back of the comp. were melted. I checked the orifice tube and it was full of filings, so I ordered a compressor, condenser, accumulater and orifice tube. I am thinking the expansion valve is fu...	View
	2001 Chevrolet Impala 3.8L Poor Idle Quality, Stall VIN: 2G1WF55K61 Hi group this is an police car, and the problem occurs only on cold start. The engne run great for about 1 minute and after the idle become unstable and the engine stall. At the initial start the two o2 sensor read up to 1000 mv,but the fuel pressure regulator...	View
	2001 Chevrolet Silverado 3500 6.6L reverse VIN: 1GCJK33191 Customer went to back out of a parking spot and go to lunch and truck would not back up and service engine light illuminated. Transmission then was in default mode. code P0847 pressure switch "D" stuck closed is present. Since this one time transmission has wo...	View
	1998 GMC Safari SLE 4.3L evaporator VIN: 1GKEL19W4W problem with my mothers van all wheel dive safari.has rear ac i nstall freon and gone in approx 3 days.three pound system.cant not see leak i used a sniffer seemed like it went of at the vents front and rear.is it commom for both evaporators to leak?	View
	1998 GMC Jimmy Envoy 4.3L brake fluid VIN: 1GKDT13W1W The brakes drag and overheat causing the truck to shake. All four rotors test out at aprox 500 degrees when this happens. I checked the fluid and noticed the gasket on the cap is swelling. I suspect fluid contamination but the fluid shows no visual sign of oil...	View
	1993 Oldsmobile Cutlass Supreme S 3.1L No Start VIN: 1G3WH54T7P this is my neighbors car. yesterday his wife had been driving it and it stalled and restarted for her. she got home and it was stalling when put into gear. it was later in the afternoon when he grabbed me and the problem had subsided, so i told him i would che... Trouble codes: 13 (o2 circuit), 15 (ect circuit), 22 (tp low), 23 (iat low), 32 (egr circuit), 41 (cylinder selct error)	View
	1999 Pontiac Montana 3.4L Hesitation, Stall VIN: 1GMDX03E7X This 1999 Montana was involved in a recent rear end crash. The visible damage was minimal, but immediately following the wreck the van began having intermittent driveability problems. For the first week or so it would simply hesitate, usually on take off, and ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Buick Park Avenue 3.8L No Start, Cuts out VIN: 1G4CW52K3V Well fellows this park ave is fixed,I would like to thank the tech's for their help,all excellent suggestions.Rock from Quebec,Joe from Maryland,Thomas from Penn.,Antonio from Ontario,Scott from Wisconsin.The fix was a pcm & reflash,Thank You and lets keep thi... Trouble codes: P0748.	5
	1993 Cadillac Seville 4.6L Excessive Emissions thanks to all who replied . I replaced fuel pressure regulator.Bad news-doesn't help. Checked all fittings, fuel rail, MAP - everything ok. After that very carefully checked spark plugs just after 10 sec engine was running and stopped and find out spark plug #...	9
	1998 Cadillac Seville STS 4.6L Long cranking time VIN: 1G6KY5495W After replacing the fuel pressure regulator the vehicle had one time when it cranked too long. After that no other problems. The vehicle has been gone for about a week with no problems reported by the customer so far. Thanks	5
	1968 Chevrolet corvette 327CID headlights thanks i recieved 9 great replies with variety from look on ebay for manuals to go to library to several who would fax me but the one i used was from paul [...] who gave me the phone # of dr rebuild, 1 [...] who supplies the vac kits and diagrams f...	9
	1998 Chevrolet Malibu LS 3.1L front end noise VIN: 1G1NE52M6W Customer is debating whether to sell this POS or have it repaired. Since the motor mounts are cracked I am recommending replacement as well as the lower control arms which seems to be the consensus. Thanks for taking the time to reply and sorry for the delay.	18
	1998 Chevrolet Monte Carlo LS 3.1L radiator VIN: 2G1WW12M1T I appreciate all replies. Again the symptoms was oil floating in the radiator. The replies came in with 4 places to recheck. 1. Block needing magnafluxed and checked for leakage. Since there was not a mmilky mix in the radiator we chose not to pursue this opti...	8
	1999 Chevrolet Express 3500 6.5L runaway idle VIN: 1GCHG35F3Y We have not gotten back on vehicle- We will report when we can get back oon Thanks Jim	9
	2000 Chevrolet C2500 5.7L Won't run Monitors VIN: 1GCGC24R4Y I still have not been able to get these trucks to pass smog. I am going to contact a dealer that is equiped to work on the CNG system and send them 1 truck as a test sample to see what they can do. I appreciate all the responses and I think as a last resort I ...	8
	1994 GMC K1500 Sierra SL 5.7L timing VIN: 2GTEK19K4R to all who replied,thanks very much. it is good to be able to ask for help and receive it. i do this by myself and have problems sometimes. the locations suggested were behind the power distribution cover on the fierwall, in the passenger compartment possibly ...	33
	1996 GMC K3500 Sierra SL 7.4L Ignition VIN: 1GDJK34JX1 With some further investigating I still was getting no spark. Under aluminum cover to right of coil was the ignition module. I replaced module and truck started and ran find except plugs were alittle fouled.	6
	2000 GMC C2500 Sierra SL 5.7L No Start VIN: 1GDGC24R0Y Thanks to those who replied. Most of the replies said that the problem was in the after-market fuel pump, because this vehicle needs 55 psi to start. I replaced the fuel pump with a pump from the dealership. It produces 56.2 psi; the vehicle starts fine, even ...	12
	1999 Oldsmobile Alero GL 2.4L front end VIN: 1G3NL52TOX thanx for all the help. found that the noise was coming from the right front hub. as many of you said, a local dealer had replaced the hub with a aftermarket hub. they replaced the right front hub 513137 and 1 nut [...]. and the customer says the noise is o...	9
	1998 Pontiac Grand Prix GT 3.8L rear main VIN: 1G2WP12K5W Most of you said seal or gasket on the seal retainer plate.This one appeared to be the gasket.One said to try stop leak and see if it slowed down then you could tell if it was the seal.This one didn't slow down so I figured I would it was time to pull the tran...	17

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