GM Automotive Technicians Technical Discussion and Fixes for Jul 9, 2008 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1973 Buick Centurion 455CID None VIN: 4P67W3Y233 Just Need Vacuum diagram for the AIR system. Need the routing on the hoses coming off the air pump. Runs Great!!!	View
	1997 Cadillac DEVILLE 4.6L Poor Idle Quality VIN: 1GEEH90Y2V replaced engine 2 weeks ago with a jasper. mtr runs fine but i have a vibration at idle with a/c on found the elbow at the pvc valve was cracked,repaired this problem.engine runs fine at idle,when a/c is turned on it has a vibration scoped the ing system nothi...	View
	1997 Cadillac DeVille 4.6L engine VIN: 1G6KD54Y9V On a cool day the car doesn't overheat and will maintain a temp of 208F. On warmer days the car will overheat in traffic. started and warmed up vehicle, temp will slowly climb to 215F when the 2 low speed fans turn on. Temp will not come down even with a gar...	View
	1992 Chevrolet C1500 Cheyenne 4.3L fuel guage VIN: 1GCDC14Z2N please see repair history	View
	1995 Chevrolet K1500 Suburban 5.7L rear heater VIN: 1GNFK16KXS hey folks--seems I remember seeing in a trade mag a month or two ago that GM released a part # for rear heater hose connector repair kits. The lazy parts guys at our local dealership just say that they don't exsit--"you have to replace the entire hose assmebly...	View
	1998 Chevrolet K2500 Cheyenne 5.7L brake pedal VIN: 1GCGK24R7W all of these items were replaced at another shop. i replaced the master cylinder with another with a larger bore size and helped but did not fix the problem. the pedal is very soft although the truck stops fine the pedal feels terable. i know a soft pedal is c...	View
	1999 Chevrolet Malibu LS 3.1L Park Lights VIN: 1G1NE52J2X This Malibu came in with the parking lights on with all of the switches off and inside alarm (ding-ding)sounding. I checked archives and found a Venture van with same senario but no fix. I see in the wiring diagram there is a Body Function Controller in the ci...	View
	2000 Chevrolet Silverado 1500 5.3L intake manifold VIN: 1GCEK19T7Y hi..this is more of a case of needing help finding a parts supplier than actual tech help. We desperately need to find out if there is a supply source for aftermarket aluminum intake manifolds for the 4.8/5.3 chev vortec motors in pickup trucks. The "plastic" ...	View
	2003 Chevrolet Cavalier 2.2L Unknown VIN: 1G1JC52F43 Customer came in with a noise complaint and needed an oil change. We found that the noise was an engine knock and it only had about 1.5 quarts of oil in it. After changing oil the noise was gone, but we couldnt pinpoint the leak. We washed the engine down and ...	View
	2004 Chevrolet Trailblazer LS 4.2L compressor VIN: 1GNDT13S94 hello iatn members have a trailblazer a/c compressor acts like its locking up,when it starts to engage it wants to kill the engine,installed new compressor same thing,so need help not sure whats going on with this thanks bud	View
	2005 Chevrolet Colorado Z85 LS 3.5L cv boots VIN: 1GCDT13625 This pickup came in the first time the RH outer boot had caught on fire the joint was ruined so I replaced the axle assembly, customer said he had used 4X4 but had taken it out and drove several miles before joint got hot, thought it stuck in 4x4 so replaced a...	View
	1988 GMC R2500 Suburban 5.7L proportioning valve VIN: 1GNGVR26K7 we have this 88 suburban 4wd, no abs, the left rear wheel cylinder was leaking badly, rear reservoir on the master cylinder was empty, red brake warning light is on. we replaced the bad wheel cylinder and tried to bleed the rear brakes, but i think the proport...	View
	1999 Pontiac Grand Am SE 2.4L security VIN: 00XM789859 looking for some gm guys for a little help.what i have here is a security lite flashes no start wait ten minutes lite goes out and car starts.sometimes try relearn only last a few days and problem returns.have heard through the grape vine there is a way to byp...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1988 Buick Reatta 3.8L Lighting VIN: 1G4EC11C2J We ended up replacing the power inverters-small boxes that convert 12v to 115v for the lights in the headlamp switch panel,wiper switch panel and the shift indicator.New parts were discontinued for it-sourced used parts from buickreattaparts.com-Mike Rukavina-...	3
	1966 Chevrolet impala 350CID linkage? I had a trans man look at it and he said that the manuel valve was not hooked to the linkage.it had gotten pushed into the valve body by my tech and went un-noticed.The linkage pin slides into two discs that are part of the manuel spool valve, the valve must ...	15
	1999 Chevrolet K1500 Suburban 5.7L Glass VIN: 3GNFK16R1X Thank you Marlin, Rick, Michael, and especially Bryan Rench who emailed me the 4 page repair section from GM. All the replies helped. The SC on the mirror display stands for Short Circuit (go figure)and OC is for Open Circuit in the temp sensor, or wiring to i...	3
	2000 Chevrolet Astro 4.3L Misfire, MIL Lamp on VIN: 1GCDM19W4Y This one is rfepaired and down the road. The fix was two injectors, and a distributor. The injectors were indeed clogged, and the distributor was worn on the gear so severely, that the misfire for the injectors was listing the wrong cylinder! When I went th... Trouble codes: 300 (Random Misfire), 121 (TPS reads Low).	18
	2003 Chevrolet Express 3500 6.0L Poor Idle Quality, Misfire VIN: 1GBHG39U43 to all that posted help. thanks . all the testing that was posted i have tested and it passed. van is gone but will be back when they can let go of it. thanks agian. Trouble codes: P0300 (random miss fire).	13
	2003 Chevrolet Monte Carlo SS 3.8L MIL Lamp on VIN: 2G1WX15K52 This vehicle is fixed! Thanks to you guys and iATN! After going over the whole system one last time again, and checking the back pressure only to find it good, I've decided to take a chance by replacing the air pump. I hate trying parts to see if it works, but... Trouble codes: P0410.	17
	2004 Chevrolet Suburban 2500 LS 6.0L Compressor ? VIN: 3GNGC26UX4 thanks to all of you that repied. I am humbled again. I reclaimed all refrig again and charged system with gauges and a 30 lb can until accumulator was cold... I did have an issue with my charge station scale...I was not even considering having an equipment pr...	8
	2006 Chevrolet Uplander LS 3.5L No Start VIN: 1GNDV23L26 This one seems too easy, 2 out of 5 people said clean the throttle body, and that the "self cranking" beyond the key turn was normal...go figure. Cleaning the throttle body did the trick...we appreciate all of the help.	5
	2000 GMC Jimmy Diamond Edition 4.3L transfer cas VIN: 1GKDT13W3Y Thanks to those who took time to reply Alex from Georgia hit it right on the head replaced TCCM and all is well!! thanks again	4

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