GM Automotive Technicians Technical Discussion and Fixes for Feb 27, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1991 Buick Regal Custom 3.8L Surge VIN: 2G4WB54LXM HELP. Surge/chuggle/jerk in engine or transmission at about 45-52 MPH at level speeds or slight acceleration while in overdrive & lockup. Customer stated the problem did not exist until the transmission was recently replaced. We test drove and did not feel the...	View
	1976 Chevrolet Corvette Stingray 5.7L power windows VIN: 1737L6S425 If someone has the wiring diagram for this Corvette and could FAX it I would surely appreciate it. Can't find where the power windows get their power from. I think I remember a relay somewhere, but I'm getting so old I have a hard time remembering yesterday. O...	View
	1986 Chevrolet Camaro Berlinetta 5.0L gauges VIN: 1G1FP21P2H this camaro blows fuse for gauges after driving awhile, had some wiring repairs behind dash but never found source of short. have heard that thees camaro's have ground problems, and was hoping that someone out there in camaro land has run into this before, or ...	View
	1993 Chevrolet G10 Chevy Van 5.0L Starting VIN: 1GBEG25K3R the problem is not present it kind of fixed itself when i pulled it in the shop.this is a conversion van that when you tuen the key off it doesnt turn off.it keeps running,not dieseling but running normal.has any one seen this before?	View
	1996 Chevrolet K1500 Cheyenne 5.0L with lights on and putting vehicle into reverse en VIN: 2GCEK19M1T engine stalls with lights on & put into reverse.also stalls in reverse with brake applied.engine stumbles when turn-signals on or brake applied	View
	2001 Chevrolet Express 3500 6.5L fuel VIN: 1GCHG35F51 Customer complaint of check engine lamp on and hard start with lots of white smoke. 1St off replaced fuel filter and road tested. I fixed PO335, a visual inspection found the crank sensor harness bad. PO1870 is overdrive is bad. Truck is going to trans shop ne...	View
	2001 Chevrolet Express 2500 4.3L hard start VIN: 1GCFG25W51 Hey guys, the main complaint is hard starting. I verified this and the engine does not crank smoothly. When cranking and a cylinder fires, the engine jerks to a stop momentarity as if the firing is out of order, just like an engine trying to start with the plu... Trouble codes: P0128, P0300	View
	1998 GMC Jimmy Envoy 4.3L Heater System VIN: 1GKDT13W3W For sone time now, this vehicle has been producing insufficient heat - Have replaced heater core and heat/defrost door in heater box, multiple thermostats - last one was OE, and water pump due to leaking (New - not reman). Still does not produce good heat and ...	View
	1992 Oldsmobile Achieva S 2.3L Excessive Emissions, Poor Fuel Economy VIN: 1G3NL5434N Customer concern is poor fuel mileage. No trouble codes. Monitored fuel trim values, trims are dropping in closed loop, engine is running rich. All sensor values are within proper range, fuel pressure is within specs, pressure regulator is not leaking fuel int...	View
	1999 Oldsmobile Bravada 4.3L No Start VIN: 1GHDT13W6X This 1999 4.3L has the "spider type" injection system - what happens is after 2-3 weeks of driving the car gets towed in due to a no start condition - we find that the injector connection at the top of the fuel metering body has been pushed up and looses it co...	View
	1994 Pontiac Trans Sport 3.8L No Start VIN: 1GMDU06L9R this vehicle was towed in with no start. started diagnosis with fuel pressure test within range checked ignition no spark. as suspected no injection pulse either. scanned vehicle for codes or out of normal data. noticed no rpms during cranking. i also checked ...	View
	1995 Pontiac Bonneville SE 3.8L Misfire, MIL Lamp on, hard cold start VIN: 1G2HX52K7S This 95 Bonneville came in with no check engine light. Starting hard and misfiring. Intial Genisys scan, no communication. Swapped PCM and car runs fine. Comes up with 1 Cam Crank error. Roadtested for 30 mins left car running. Quick roadtest again with Genisy...	View
	1994 Saturn SL2 1.9L Excessive Emissions, Surge, Cuts out VIN: 1G8ZK5576R Thank you in advance.	View
	2002 Saturn L200 2.2L odometer incorrect VIN: 1G8JU54F72 Good Morning and thanks in advance for reading this long help request. This vehicle was brought to a customer shop of mine with a dead battery/ battery cable problem. Problem was repaired and when power was restored the odometer is reading 694729 miles on a v...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1985 Cadillac Seville 4.1L Brake pedal VIN: 1G6KS6980F Thanks to all who responded. After much deliberation and talking with the customer we proceded to throw parts at it. The pedal feel became better with a new proprtioning vale and acceptable to return to the customer when front brake hoses were replaced. I neve...	14
	1998 Cadillac DeVille 4.6L lights stay on dash VIN: 1G6KD54Y8W Thank you to the three people who replied to our post. We did check grounds again to no avail - we also put a test pcm and stock radio (customer had aftermarket stereo system - but they had done a good job of installing it - no breach of the class 2 serial dat...	3
	1986 Chevrolet S10 2.8L fuel gage VIN: 1GCB514R2G thanks to everyone. unit was loosing ground through locking ring on top of tank.most everyone hit the nail on the head.came in this morning checked ground cleaned ring gage works perfect.many thanks again	15
	1988 Chevrolet Celebrity 2.8L No Start VIN: 1G1AW19W1J Thanks to everyone for your help. Ron (chevy tech) hit the nail on the head found #4 & #6 injectors shorted. replaced injectors reinstalled original ecm. vehicle now runs still has a cwl for knock sensor but customer chose to ignore the light for a while. once...	16
	1989 Chevrolet Corsica 2.8L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1G1LT51W4K thanks all for the replys I went and installed a set of injectors and the car now run very good thank you Trouble codes: 45 (running rich).	20
	1996 Chevrolet Caprice Classic 5.7L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2B1B684P1T hello everyone thanks for all your imput,today was my lucky day, i finaly got it!!! it was the wires to the o2 sensors. someone took trans and engine out a year ago and crossed the left rear o2 sensor wiring with the right front o2 wires. ecm was being told it... Trouble codes: 300 (multiple miss fire), P0154 (insufficient activity b2 s1), P1653 (oil level light circuit).	21
	1997 Chevrolet Malibu 2.4L alarm VIN: 1G1ND52T4V Thanks for all the replies. One of these days, customer's are going to learn that things would be a lot easier if they would just tell us everything up front. Come to find out, it did have an aftermarket alarm, it just hadn't been working. I removed the alarm ...	7
	1997 Oldsmobile Achieva S 3.1L theft detterent VIN: 1G3NL52M8V Thanks to all who responded, after relearning the ignition switch 3 times like suggested I still had a start/stall conditionand a code 1629. I checked the serial data line and found it ok no short to groung after disconnecting all the modules IPC,PCM , EBCM, S...	4
	2002 Oldsmobile Bravada 4.2L rear wiper VIN: IGHDT13552 the problem was the rear tailgate control module.it seems they have been updated several times.the module will need to be flashed,	3
	2002 Pontiac Montana 3.4L MIL Lamp on VIN: 1GMDU03E42 This vehicle is going back to the auction as buyer doesn't want to spend any more time or money on it. Replies were to check for c305 connector behind driver's seat due to water getting in it. Grounding class 2 data line, under pass side sillplate and rug area... Trouble codes: U1040, U1040, U1300, C1298.	3
	1993 Saturn SL2 1.9L Excessive Emissions VIN: 1G8ZK5578P thankyou to all who replied, it was a communications problem with the scan tool. The new MODIS and updated red brick have software issues that affect this vehicle. If you use the old cartridges in the red brick, or enter a different set of paramaters the scan ...	4

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