GM Automotive Technicians Technical Discussion and Fixes for Sep 2, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1989 Cadillac DeVille 4.5L no comms VIN: 1G6CD5157K Long one - bear with me. Vehicle arrived for A/C check, "Service A/C" lamp illuminated on dashboard. Being a caddy owner myself, I immediately tried using the onboard diagnostics to gain access to the system, expecting to pull an "F" series code. Using the OFF...	View
	1985 Chevrolet Camaro Berlinetta 5.0L Excessive Emissions, Poor Idle Quality, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1G1FP87E9F hello andd thanks for any help in advance im the third person to work on this car i have found the system that the problems on...and im thinking a ground problem..this car will run as long as the altinator is disconnected...as sooon as you plug the alternator...	View
	1987 Chevrolet Caprice 5.0L Alternator VIN: 1G1BN81Y9H Hello Everyone, This one has got me stumped. Original complaint was belt squeel and battery runs down. Checked charging and Amp output was 0 Amps, voltage was battery voltage(12.6) Found regulator connector was gone and someone had replaced with spade terminal...	View
	1997 Chevrolet K1500 Cheyenne 5.7L rear brakes VIN: 2GCEK19R2V Hello all This truck is like the many of the GM's that come to us. They go through 5 sets of front brakes before the rears start to show wear, this particular one the customer pulls a big boat with it, and is warping rotors and going through pads like crazy. ...	View
	1997 Chevrolet C1500 4.3L Misfire VIN: 1GTDM19W3V This vehicle came in with an SES light coming on going up a hill. I road tested the vehicle and found the vehicle has a dead misfire on cyl 1 as soon as you reach 100km As soon as you slow down below 100 km the miss stops. I monitored fuel pressure during the ... Trouble codes: P0301	View
	2002 Chevrolet Trailblazer LS 4.2L No Start VIN: 1GMDT13S72 Suv came in on a rollback was stuck in owners garage. When the driver tried to get it off the wrecker the shift interlock wouldn't work. Disconnected the shifter on the trans to get it off. checked the interlock solenoid and no power was getting to it. After f...	View
	1994 GMC Jimmy SLE 4.3L drive VIN: 1GKDT13W5R this truck came in with an intermitant slip, it will be driving and shifting excelent, then after it gets hot, it will go into neutral, usually after i slow down then accelerate again, if i cycle the ignition key it will go in gear again. at first i thought it...	View
	1999 Oldsmobile Silhouette Premiere 3.4L Running lights and dash lights VIN: 1GHDX03E8X I've searched the internet, and I've found a few people who have had this problem but no solutions have been posted. This van has no running lights, dash lights, or automatic headlights. When you open the door the vehicle chimes quickly as if the headlights ar...	View
	1999 Pontiac Grand Am GT 3.4L MIL Lamp on VIN: 1G2NW12E0X car runs great. tightened gas cap. need help with the 172 code. thanks in advance for the help Trouble codes: 172 (rich exhaust), 440 (emission evap leak)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Cadillac DeVille 4.6L Low side temp senser VIN: 1G6KD52Y1T Well I have fix this car I called the caddy dealer and they had no idia about a criping tool but i foud a speeo cabale criping tool fit around the line and I recripted it and drove and all is well now thanks for all the help you all are great thanks	9
	2000 Cadillac Seville SLS 4.6L starter VIN: 1G6KS54Y8Y Thanks for all the replies. Every reply confirmed what I had been suspecting. I replaced the Ignition switch and the vehicle starts everytime. I had thought about that but could not find anything on how to test the ignition. But after all the post and help I r...	5
	1985 Chevrolet Corvette 5.7L Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1G1770786F Sorry but I need to close this for now. Waiting on a injector tested so I con flow test them as alot of you suggested. My friend also own a body shop and wnated to start replacing all the body bushings. As soon as I get the car back I will reupdate this with w...	19
	1987 Chevrolet V10 Custom Deluxe 5.7L Poor Idle Quality, Surge VIN: 1GCEV14K7H Well, first of all thank you to all who responded. All of the replys were good but Rolfe, Robert, and David were the closest to the solution to the problem. While, my specs on fuel pressure say 9-13 psi, I decided to try to increase the pressure by altering th... Trouble codes: 44 (Lean exhaust).	14
	1992 Chevrolet C3500 Cheyenne 5.7L Force Motor VIN: 1GBJC34KXN Thanks for all the help, but the solution is way too easy. I went ahead and dropped the pan to check the wires in the trans and I found the wires for the force motor were frayed.	5
	1993 Chevrolet K1500 Cheyenne 5.7L Poor Idle Quality, Stall VIN: 1GCEK14K9P First of all, thank you to all that replied. The fix ended up being a distributor shaft and pick-up coil. One of the replies suggested checking to see if timing advanced 5-10 degrees at about 2000 r.p.m. with e.s.t. wire disconnected. This is a test that I h...	11
	1994 Chevrolet Cavalier RS 2.2L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 1G1JC5442R After checking everything under the sun, customer decided to take vehicle and bring it back later. I didn't get Ron's reply until after the car had been picked up but that is where we were going to go next. We tried borg warner injector first and then a set of... Trouble codes: 45 (Rich Exhaust).	10
	1995 Chevrolet Blazer 4.3L ABS module VIN: 1GNDT15W1S The customer took this vehicle and I haven't seen it since I posted. I wanted to switch pins going to the ebcm, as Nick from NH (thanx, Nick)suggested, to see if I could make the problem 'move,' so to speak. That was a great idea. As i said before, I was getti...	7
	2000 Chevrolet S10 4.3L Hesitation, Hard Start VIN: 1GCCT19W5Y I installed a new fuel pump which fixed the hard start problem. I also installed a new mass airflow sensor which took care of the hesitation. Thanks for all who helped	5
	1992 Oldsmobile 88 Royale 3.8L Excessive Emissions, Cuts out, Stall VIN: 1G3HN53L3N I'm happy, car is happy, customer is happy. Thanks for all the great replies. This is the type of fix you read about in tech mags and hope you never see one in your shop. I will start with the fix and go on from there. The o2 was bad(stuck lean), the ECM was s...	19
	2002 Pontiac Grand Am GT 3.4L Pads/rotors VIN: 1G2NW12E22 The noise has been gone for a couple of weeks now. The upgraded pads did the trick. The customers husband actually called and said that his wife is a 'chronic complainer' (NO KIDDING!) and that everything was fine with the repair.	19

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