iATN Member GM Auto Repair Tech Exchange for October 23, 2007

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Open Help Requests for GM

	Help Request	Answers
	1965 Chevrolet corvette 327CID axle shaft ok vette guys i need help. installed new u-joints in lr axle had to replace spindle flange because it was sprung could not get both u-joint snap rings in. bolted flange and axle shaft to wheel flange the u-joint caps on the diff. side are 1/8 to 1/4 away from ...	View
	1994 Chevrolet Pickup 7.4L Master cylinder Help, This is a 1 Ton company vehicle, same driver every day. It came in with clutch out, replaced all componants including flywheel. Came back in a week with the master cyl broken about 2 inches from the end on the cylinder. we have installed several differen...	View
	1994 Chevrolet Pickup 5.7L 1-2 shift This is our work truck. This 4L60E will not shift into second gear most of the time. When cold it seems to shift properly the first few times. After that no second gear. The scan data shows the command to shift to second and the wires going to the tranny are ...	View
	1995 Chevrolet Suburban 5.7L 1-2 and 3-4 shift I put the whole story in the related repair history.	View
	1999 Chevrolet Blazer 4.3L u-joint Common knowledge is some GM u joints are non-servicable---some are serviced at 7500 mile intervals---I had a customer whose drive shaft u joint failed on a trip. We were the last shop he had been to for an oil change. We did not lube the drive shaft, it has gr...	View
	2000 Chevrolet Silverado 5.3L Hesitation Truck came in with cold hard start and poor drivability cold for 1/2 mile. No codes. Seems to be running lean but I cant catch it on scanner. After 1/2 mile of driving it is fine all day. We first Cleaned the fuel injectors and it starts faster hot but no chan... Trouble codes: non (testing and results).	View
	2003 Chevrolet Silverado 6.6L 3-4 shift Hi everyone, Our first Allison here and it isn't going to good, We originally got this one a couple months ago and the clutchs were burned, the owner had been stuck with it and said it acted up after that so we did a overhaul on it replacing the clutchs, seal ...	View
	2004 Chevrolet astra .0L Lighting Hello everyone this car is made out of the country and i don't have any info on it. I have two issues, one should be easy the other should be really easy. first I would like to know what coolant is reccommended in this car, the customer is insistant on changin...	View
	1998 GMC Jimmy 4.3L heater No heat most of the time. then great heat. A years ago this truck came in with the same symptoms. Flushed the system and the heater worked great. Came back a week ago,with no heat. Being that the dex-cool was only 2 years old we just flushed the heater core. n...	View
	1999 GMC Yukon 5.7L 4wd hello friends. we have this 99 yukon with inop. 4WD. the switches on the dash seem to work,as they all light and blink once with ignition cycle. we found a bad connector at the transfer case encoder motor, and replaced it. fuses are good and circuit is getting...	View
	1999 GMC Suburban 7.4L engine lifter noise hi and thanks for reading my post. this 99 gmc is a regular customer. we did the lifters about 6 months ago all of them because it was ticking and they were falling apart. well, he was out of town for about 3 weaks, and the veh sat in his driveway while he wa...	View
	2002 GMC Yukon XL 5.3L heater car came in with complaint of no heat in front, that is true, rear heat ok no front heat, checked temp of heater hoses going into and out of core almost 25 degree difference, problem solved--i wish-- 3 days later after removing dash and installing new oe heate...	View
	1997 Oldsmobile Achieva 2.4L No Start Car was towed in for no start about one month ago. Security light was flashing. This system does not have the chip in key .I did the relearn and car would start some of the time.When the car would not start I could wiggle the key switch around and after a few ... Trouble codes: 1629 (theft deterrent crank signal fault).	View
	2000 Pontiac Grand Am 3.4L engine first repair: vehicled failed co2 test. replaced head gaskets, t-stat, head bolts, had heads machined and checked for cracks and resurfaced. reassembled with all new gaskets. returned to customer. ok for about a week. car returned doing same thing. overheat an...	View
	2006 Pontiac Grand Prix 3.8L security system this vehicle was towed in for a cranking over no start and sometimes it would start and run for 20-30 seconds then die. there were no codes in the ecm, bcm or any other module. so we decided to put a cyl. lock and switch in--but we have the same result. i have...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Buick LeSabre 3.8L Misfire replaced the ecm and all is fine so far thanks to all that replied !!! when I scoped the injectors I could see #6 drop out so I replace the ecm for a bad driver circuit Trouble codes: p0300 (cylinder 3 and 6 missfire).	38
	2003 Buick Regal 3.8L 1-2 shift I have not fixed the vehicle yet. Problem is very intermittent and I'm leaning towards a rebuild because of the miles. Most posts suggested replacing pressure control valve.	16
	2003 Buick Century 3.1L rocker bolts we repaired the threads (heli coiled) on 4 of the 6 rear rockers, since only 2 would tighten to 24 ft lbs. added a little thread locker, and started it up. ran very well. thanks for all the help!	18
	1992 Chevrolet Pickup 5.7L Hesitation, Misfire Thanks for all the replies. It turns out that we were following a lost cause. The customer just wanted the initial problem of running rough fixed. We thought the other problem of the misfire was related to that problem. Turns out the truck has been doing t...	21
	1993 Chevrolet Suburban 5.7L Hesitation Hello and thank you all this suburban is fixed. A couple of you suggested I look to the distributor for cracks or arching and I found the rotor was starting to be worn down on the outer edge. When I was removing the rotor that is when I found the slop in the...	17
	1996 Chevrolet Caprice 5.7L egr ports restricted Hello everyone and thanks for the help on this one. I recieved many replies on this one about using close hangers etc to ream this out. Also some were lighting the carbon up with a torch etc. Scares me, but will trust that works. I found that this one was ...	9
	1997 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, MIL Lamp on Many thanx to all who responded. Sam from AR brought up inj. issues and also dist. cap problems. The cap had already been replaced before I got the truck from another shop. I had already installed a new inj. in cyl. #2 position as well with no change to sympt... Trouble codes: PO300 (random misfire).	9
	1997 Chevrolet Pickup 5.7L Misfire This vehicle has not come back yet for further diagnosis.Some techs suggested the injector system, and I am leaning in that direction.Other than that, most suggestions were the usual common items. Thanks for all the help, Dave	14
	1999 Chevrolet Corvette 5.7L Automatic Door Locks and Loss of Key Fob Memory Thanks to all who replied. The customer decided to trade the car off	3
	2000 Chevrolet S10 Pickup 2.2L MIL Lamp on after 2 crank sensors i tighend the pins in the ecu connector and havent any more probs we will see the dealer had already put the icm on the car thanks for the help Trouble codes: 335 (ckpcircuit).	3
	2003 Chevrolet Impala 3.8L Run Stand I received a few good replies on this one. Most helpful suggestions included the use of bypass modules for theft deterrent systems. I chose to go with modules from fortin electronics. After wiring all of the computers and anti-theft systems, I was able to u...	11
	2003 Chevrolet Cab & Chassis Silverado 6.0L no fuel well the truck is fixed with 2 problems found.problem 1 The new aftermarket sending unit wand is one inch to long. and there is a very narrow window for it to move it was stuck at empty.the next problem is alittle strange.there are three wires i was testing ,...	6
	2004 Chevrolet Venture 3.4L wire harnesses When you lift the carpet to find 2 gallons of water and a thriving colony of slime mold, you know there is a major problem. Haha. Wash hands frequently. ... ... In this case, the sole source of the water was A/C condensation. I had just finished drying ...	6

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