iATN Member GM Auto Repair Tech Exchange for January 26, 2007

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Open Help Requests for GM

	Help Request	Answers
	1988 Chevrolet K1500 5.7L No Start Aloha to all and thanks for your time, This truck has no injector pulse at either injector. There is power to the injectors. The fuses check out good; power in and out. The customer installed a new fuel pump and aftermarket distributor from Jegs. A new ECM was...	View
	1989 Chevrolet C1500 5.7L Excessive Emissions, Hesitation, Surge, Stall, Misfire Hey Folks thanks in advance. I Have this 89 1500 2 wheel ride 5.7 and it's Kiling me Customer say's Truck will cut off and stall but will restart and has tried several things his self as posted above but we found several codes stored and the main one we though... Trouble codes: 45 (Rich Exhaust), 44 (Lean Exhaust).	View
	1990 Chevrolet Corvette 5.7L horn The horn does not work. I am trying to find the horn relay. The MOD says that it is located behind the right side of the dash. I have taken out the glove box and the lower panel. I think that I can test this thing if I could find the relay. Thank you for your ...	View
	1992 Chevrolet K1500 5.7L heater control Customer was driving when he smelled something hot or wires burning type smell. Next thing he new the heater control module went dark. IWhen he brought the truck in I tested for power and good ground and smelled the control module. It smelled fried so I replce...	View
	1994 Chevrolet Astro 4.3L Hesitation, Surge This vehicle has very poor acceleration from a stop. It seems worse when cold, or when ignition is turned off and re-started. No codes, lean o\2 sensor high B L \integrater, Injector pulse width widens with load. Fuel pressure responds ok. But we cannot find a...	View
	1997 Chevrolet Cavalier 2.2L ignition i have a body shop next to me here and they have been picking my brain about this problem. they try to do most of their own stuff ( i only get what they don't want to do ). anyway this is a car that was hit ( lite hit to right front ) and they replace the lowe...	View
	1999 Chevrolet K1500 Suburban 5.7L MIL Lamp on This suburban came to us with a p0141 heater circut DTC for bank 1 sensor 2 so we check power to the heater on the left rear HO2s and found it to be good so replaced it it came back which we had an aftermarket part in it and put a GM part in it then i came bac... Trouble codes: p0141 (HO2s heater circut bank 1 sensor 2), p0430 (catalyist ineffeciancy bank 2).	View
	1999 Chevrolet Metro 1.3L Unknown came in with check engine light on code p0420 post 02 sensor is staying at 1.275 volts all the time even if you unplug it. Back probed the signal wire and have voltage of 4.3volt I'm thinking it is the pcm bad.has anyone ran in to this before?	View
	2000 Chevrolet Malibu 3.1L Instrument Panel I have a instrument cluster problem I need help with. The first symptom that occurs is the tach starts bouncing around and then stops reading at all. At the same time the low fuel, high coolant temp, cruise control, battery, and oil lights will randomly start ...	View
	2001 Chevrolet Silverado 1500 4.3L Misfire misfire on cylinders 1 and 4 they replaced with a used engine replaced distributor cap and distributor/wires and spark plugs compression good on cylinders, replaced egr cadiallic convertors are good sent to dealer to check for updates and reprograms on pcm no ... Trouble codes: p0300.	View
	2001 Chevrolet S10 4.3L MIL Lamp on Hello all, I have an odd one here. This truck originally came in for a check engine light and running extremely rich, black smoke. Another shop had installed the parts listed in related repair history. We found bank two sensor one biased lean all the time. We... Trouble codes: p0300.	View
	2001 Chevrolet Tahoe 5.3L encoder motor pulling hair and teethe!! Very good customer. Customer first and only engagement of 4wd resulted in all lights on switch going out and service 4wd lamp in cluster coming on. Tried to scann tccm and no communication. consulted wiring diagram and found atc fuse ...	View
	1995 GMC G3500 4.3L heater Van came in for no heat. We flushed heater core, put in new t-stat, dindt hlep. We put a new fan clutch and put cardboard infront of radiator, no help. In shop we get 130 vent temp, out side we get 95 vent temp. So we pulled heaterbox, all doors/seals ok, Air ...	View
	2000 Oldsmobile Intrigue 3.5L temp gauge This car came in with a noisy water pump I replaced the pump and 2 days latter the owner called and said that now the temp gauge somtimes goes to hot stays there a little while and then drops back to normal. I got the car back and test drove at idle it would b...	View
	1990 Pontiac Grand Prix 3.1L ecm Hello Techs, I cannot communicate with this ECM. MIL is on, and this car intermittently bucks and coughs under tip in throttle, sometimes to the point of stalling. I have checked fuel pressure while test driving, no drop in pressure while stalling (approx 38ps...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Buick Park Avenue 3.8L vibration the flywheel and the torque convertor were different,between the old and the buick. so I replaced the flywheel,torque convertor and starter to the ones form the olds and problem soloved. thands to all for the help!!	11
	1993 Chevrolet Lumina 3.1L Misfire performed a compression test on all cylinders - other cylinders read 150 psi - performed a wet test on cylinder 5 - compression increased. faulty rings assumed - tear down necessary. thanks for the help. Trouble codes: P0300.	28
	1993 Chevrolet C1500 5.0L Cuts out, Stall Sorry it took so long, we had this truck for a week. FIRST, LET ME THANK ALL WHO REPLIED TO MY NIGHTMARE. I WENT THROUGH EVERYONES REPLIES AND CHECKED EVERYTHING THAT YOU SAID. WE DID HOWEVER FIND THAT #5 AND #7 spark plug to be carbon and oil fouled. so we pu... Trouble codes: DTC, 44 (lean exhaust).	23
	1996 Chevrolet Cavalier 2.4L Excessive Emissions, Poor Idle Quality, MIL Lamp on Thanks to everyone for suggesting wiring;almost replaced PCM.Ground wire was open.Again, thanks for all the suggestions. Trouble codes: P0134 (No Activity detected on B1 S1).	9
	1999 Chevrolet C1500 Suburban 5.7L No Start Lesson learned. Just because you have power coming from the fuse does not mean you have power every place else. The VTD module power wire had been kinked and was not powering the module. Repaired the wire, went through the relearn and presto it is running. Tha... Trouble codes: P1626 (VTD System), U1192 (testing and results).	23
	2001 Chevrolet Silverado 2500 6.0L Misfire thanks for everyones fast replies,after driving with scan tool hooked up i determined that this is converter slip.i have 98% lockup and 115 to 178 rpms of slip i still dont know if this is acceptable or should i have no or very little slip.i have no ses lamp a...	39
	2003 Chevrolet Suburban 1500 5.3L steering The condition was corrected by replacing the 670 steering box with a 680 steering box per TSB 05-02-32-008a.	11
	2005 Chevrolet Equinox 3.4L No Start I want to thank all who responded. I cleaned the ground connection at the lower passenger side rear of the block. It has been over a week and have not had any call backs from the customer. I am writing this one off as fixed. Trouble codes: c0000 (vehicle speed information malfunction), u1024 (losss of serial communications data).	5
	1996 Oldsmobile Aurora 4.0L No Start Thanks to everyone, almost all replies suggested the fuel pressure regulator. We starter the car let it run for 10 mins, pulled off the vacuum line at the regulator and immediatly had fuel exiting the regulator. Installed a new regulator and problem was fixed....	14

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