GM Automotive Technicians Technical Discussion and Fixes for Jul 15, 2010 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1961 Buick Invicta 6.6L Charging VIN: 4667B0DYBA This Invicta has had the geerator and the voltage regulator replaced. The wiring from the generator to the regulator is good. I have 14 volts on the white wire to the regulator but only battery voltage on the red charge wire. I don't have a good wiring diagram...	View
	1978 Cadillac Seville 5.7L No Start, Hesitation VIN: 6S69B80466 Found coolant temp sensor open [infinite resistance] switched iat sensor and coolant sensor, started better but ran rich. Installed 3.3 k ohm resistor in iat circuit. Note: vehicle died before I did this but I thought I had flooded it. Now have no fuel pump or...	View
	1997 Chevrolet Tahoe 5.7L everything VIN: 5634GHDFHG ac workes fine util the heat of the day is beating down on it for a couple hours. Then nothing works.	View
	1997 Chevrolet C-Series Kodiak C6H042 7.0L Hesitation VIN: 1GBJ7H1MXV I was looking for the fuel pressure specifications on this truck. I dont have any information on this. thanks for the help.	View
	1997 Chevrolet K1500 Silverado 5.7L mode doors and a/c comp VIN: 2GCEK19R6V I have not seen the a/c controls "smoke" but they will simply fail to operate correctly. Mode doors,blower all work good for a short time.(before control quits)Previous owner says he has seen the control smoke and then it quits all funtions except blower. Have...	View
	2001 Chevrolet Venture LT 3.4L hydrolic brake system VIN: 1GNDX03E71 I cant seam to fiqure this one out. the pedal travel is too long and the brakes are to weak. the don't have enough bite to lock up the wheels and they fade very quickly. The pedal pumps up good and does not drop when the vehicle is not running but if started t...	View
	2001 Chevrolet Venture LT 3.4L Compressor? VIN: 1GNDX03EX1 Good evening group-I need to post another hvac dilemma to all out there. I replaced the condensor in May and the system cooled great until last week. Owner stated that on July 4th, he backed the car out of the garage with the a/c on and noticed no cooling. Sud...	View
	2002 Chevrolet Trailblazer LTZ 4.2L Head Lights VIN: 1356224054 Thank you ahead of time to all who answer.cust advises while driving at night automatic headlights will shut off at times.then will come back on after a moment or 2.also manueal headlight switch will not function.we do not have the car at this time i just thou...	View
	2000 GMC Safari SLE 4.3L inadvertent power relay VIN: 1GKEL19W3Y We have a 300ma constant draw on the battery. When we disconnect the ctsy fuse #3 or the tbc fuse #9 or the inadvertent power relay the draw is gone. We let the van sit for a 1/2hr and still has the draw. Disconneted the body control module and the draw went u...	View
	2001 Oldsmobile Aurora 4.0L Misfire VIN: 1G3GS64C31 Car came in shop with ses on, has po171-po174 lean bank 1-2. check fuel pressure within spec, (42) psi althogh a little low for me. Monitored fuel trim and ho2s, fuel trim at the time of failure was 20. max spec is 23. check ho2s both switcheing 200-800 mv. re... Trouble codes: P0171, P0174	View
	2002 Oldsmobile Alero GL 3.4L No Start VIN: 1G3NL52E4C Hey guys! I would greatly appreciate any input you guys can give me on this one. About a month ago this car came in on the hook with a no start. The security light was on while cranking. We replaced the passlock. It started fine. Today it came in on the hook a...	View
	2006 Pontiac Torrent 3.4L Evaporator VIN: 2CKDL73F06 I have this Pontiac Torrent here that has great cold a/c untill a long drive cycle. When the air is run for a long time it turns warm (evaporator freeze up, I think). When the car is stopped and restarted several hours later the air works fine again. I found a...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Chevrolet Lumina 3.1L starter VIN: 2G1WL52M7S Thanks again for the great response. Almost everyone that responded said lock cylinder wires. I just could not get past the fact that the resistence @ the cylinder wires under the dash matched exactly the resistence across the key. I should have known to check...	28
	1995 Chevrolet G10 Chevy Van 4.3L Poor Idle Quality VIN: 1GCDG15Z45 well,after many hours re-checking everything i had checked before,vacuum leaks,egr,fuel pressure and volume,even tried an ignition module. final try was a new ecu...and tada. ran vehicle on 5 test drives a total of 15 miles and no problems.although i cannot ch...	18
	2004 Chevrolet Silverado 1500 LT 5.3L evaporator VIN: 2GCEC13T74 Thanks to the many who replied. I was suprised that several replies indicated that the charge specified by chevrolet was wrong. after verifying the correct orfice tube was used and checking for blockages on the low side, we started adding freon about two oun...	29
	2005 Chevrolet Uplander LS 3.5L rear suspension VIN: 1GNDV23LX5 thanks to all of you guys you really helped me ,my problem was the trailer arm busching it was looking good but it was bad .thanks again .	7
	2006 Chevrolet Cobalt LS 2.2L left front door latch VIN: 1G1AL55F66 Thanks to all who responded. No suggestions opened the door but did confirm that I was doing the right things: VERY helpful. Now my solution. This info may only be helpful on limited models but knowledge is power. Everything I am going to describe was done wit...	7
	1995 GMC C3500 Sierra SL 6.5L Surge, Cuts out, Stall VIN: 1GDKC34F3S Customer had to use the rig and he's just nursing it around. As soon as I see it again I will update this post. I'm eager to try the ideas that were suggested. Thanks Trouble codes: 31 (Map input low), 27 (APP 2 cicuit fault), 23 (APP 1 circuit fault), 22 (APP 1 circuit low), 65 (APP 3 circuit range), 99 (APP 2 5 volt ref fault).	9
	2003 GMC Sierra 2500 HD 6.6L Electronic VIN: IGTHK291X3 Problem is solved. I found chaffed wiring at the fuse box area. Someone had not properly positioned the harness and it rubbed through on the edge of the brake m/cyl. It wore into the green and yellow wrapped wires (data wires i believe). Thanks to the guys who...	4
	1998 Saturn SL2 1.9L Unknown VIN: 1G8ZK5273W I am tending to think we may have been getting poor MLS switches --We will try "another" and see what happens and update this help request when we get more info	4

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