GM Automotive Technicians Technical Discussion and Fixes for Dec 29, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Buick LeSabre Custom 3.8L No Start VIN: 1G48P52L4R Happy New Year to all. I could sure use some help on this car. It will fire up then drop dead after about two seconds.Acts like a VATS problem. There's no injector pulse after it dies. There is good spark. Turn the key off then it will restart and drop dead th...	View
	2000 Buick LeSabre Limited 3.8L no 4th gear VIN: 1G4HR54K3Y Vehicle just won't go into 4th gear.	View
	2001 Cadillac DeVille 4.6L Poor Idle Quality VIN: 1GEEH90Y71 Vehicle idles high sometimes, sometimes idle will drop off and car will stall. code P0507 stored but has not come back.Vehicle RPM @ 1100, desired rpm 1000, vehicle spec @650.When commanding idle with Tech 2 willdrop down to 500, but IAC count never drops belo... Trouble codes: P0507 (Idle System High)	View
	2007 Cadillac escalade 6.0L tpms VIN: WE56TR6798 I have a 2007 escalade I need some information about the tire pressure monitoring system. this truck lost 3 wheels in a wreck and wheels and senors and tire have been replaced. I need to know how to program the replaced sensors. I have tried after entering lea...	View
	1968 Chevrolet Camero 454CID Engine I.D. VIN: 124378L842 Hi Gentlemen, Just tring to identify this Chevy BB casting # [...]. Thanks, Sam	View
	1990 Chevrolet Corvette 5.7L Misfire VIN: 1G1YY238XL Hello all, I have a 1990 corvette that has 3 dead cylinders at all times, #5,6,7 CYLINDERS. Have scope tested igntion and even replaced all igniton components except internal distributor parts, have tested compression-good, have scope tested injector pattern...	View
	1994 Chevrolet Astro 4.3L No Start, hard start This vehicle came in with a no start condition. We found good fuel pressure and wet plugs. Coil wire was faulty. We replace plugs, wires, cap and rotor. We also checked for a leaking injector. We removed the intake manifold tuning valve and looked in with a bo...	View
	1996 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 2GCEK19R3T Hello out there and happy new year! Please help us!! Customer phoned with no start condition - mid Dec, I went on a road call and vehicle started (after a few tries) and I drove it to the shop. It started up fine for the next couple of days, then it did it aga...	View
	2002 Chevrolet S10 4.3L drive shaft VIN: 1GCCS19W82 Vehicle has a vibration at about 20, 40 and 55 mph accompanied by a noise. Replaced drive shaft w/aftermarket built drive shaft. This unit was made with a single u-joint on each end instead of cv joint. Noise and vibration is a lot better but still present. An...	View
	2003 Chevrolet S10 4.3L Timing chain VIN: 1GCCS19X53 Customer came in with noisy motor under load. First suspected Idler pulley but after replacing, noise still there. Removed serpentine belt to disconnect all accessories and under brake load, noise is still there and predominant around the timing chain. Wonder...	View
	2005 Chevrolet Trailblazer LS 4.2L engine tick VIN: 1GNDT13S55 Hello everyone, I have this Trailblazer with a 4.2L engine that has what I believe to be a valve train ticking noise. When it came in the coolant in the overflow was down so I thought there could possibly be antifreeze in the oil. Drained and pressure checked ...	View
	1998 GMC K1500 Sierra SL 5.0L No Start VIN: 1GCEK19M4W Towed in, no start. Checked fuel pressure, 60 lb, marginal. Installed motor vac with shop fuel, adjusted fuel pressure to 64 lb. Checked for injector leak down, marginal for #7 at first but detergeant must have cleaned it and it now seals. Plugs were soaked, c...	View
	1999 Oldsmobile Alero GLS 3.4L Long crank time VIN: 1G3NF52E9X HELP PLEASE This one has me realy wondering when this eng is cold and you try and start the car it will crank and crank it may buck a little and then it will start and idal and run fine it has set no codes in any mudule now this is where I get confused I have ...	View
	1991 Saturn SC 1.9L No Start VIN: 1FTWW33F93 I'll apologize ahead of time for the basic post, guys, but I have talked to all the techs I know personally and NO ONE has ever replaced the fuel pump on a Saturn. Why is this? Are these pumps that good? Anyways, I'm doing a friend a favor by replacing his f...	View
	1996 Saturn SL1 1.9L Cuts out VIN: 1G8ZG5285T This vehicle arrived barely running with a po336 crank sensor code stored. Lab scoped sensor on purple and yellow wires both erratic, replaced sensor. Now vehicle starts and runs normally to 2700rpm at which point it acts like a rev limiter kicks in also tach ... Trouble codes: 336 (crank position sensor performance)	View
	2003 Saturn Vue 2.2L Poor Fuel Economy, MIL Lamp on VIN: 5GZCZ23D23 Vehicle came in with p0172 and a complaint about poor gas mileage. We found a vacuum leak at the intake manifold cyl#1. After repairing the leak a smaller vacuum leak was also found at the injector o-rings. Now at idle the fuel trims all stay normal and even a... Trouble codes: P0172 (fuel trim rich condition)	View
	2003 Saturn Ion-1 2.2L No Start VIN: 1G8A152F73 hi customer stated this car ran fine no ck engine light no symptoms, went to start car in driveway and had no start condition, no codes stored, scanned sensors iat and ect read -40 degrees, iac reads 192333 lt fuel trim -81 5 volt reference at iac tps map iat ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Buick Roadmaster Collector's Edition 5.7L Level Control VIN: 1G4BT52P7T On this particular vehicle, the customer only noticed the compressor running when it had a lot of weight in it. When removing the weight, he never noticed it. We found a leak in an air line repair fitting, that only leaked under higher pressure. After repairin...	6
	2002 Buick LeSabre Custom 3.8L door locks, cig lighter, garage opener, courtesy l VIN: 1G4HP54K82 Well This one went to the dealer after some checking... turns out there was a ground issue witch was the only thing left that made since but I had no luck finding out which ground was at falt...	5
	2002 Buick LeSabre Custom 3.8L column VIN: 1G4HP54K32 Thanks Chuck and John, greasing the Steering gear upper seal was the cure. Thanks for all the help.	7
	1996 Chevrolet K1500 Cheyenne 5.7L No Start, Misfire VIN: 2GCEK19RXT Thanks to Gary from Az. & David from Wisc.The dist.drive gear was stripped.I'm curious as to how long it took y'all to find this? After looking at the replies I removed the cap and turned the cap& dist.cap back and twisted harder to find the dist.would finally...	15
	2001 Chevrolet Monte Carlo LS 3.4L cooling fans just a quick thank to all that replied. Sorry it taken a while to post a close i was out on an injury and just returned to work. This vehicle turned out to have a shorted ecm causing the high speed fan to not come on. Programed new comp and installed and fans ...	4
	2001 Chevrolet Silverado 1500 5.3L hard start VIN: 1GCEK19T91 Thank you all for your advice. Found it hard to believe, but we had a defective ac delco fuel pump. We had a hard time finding a place to hook up guage because of steel and hard plastic lines, but when we finally did, we lost pressure when cranking. New fuel p...	17
	2002 Chevrolet Suburban 1500 LT 5.3L No Start, Stall, MIL Lamp on VIN: 1GNFK16Z62 This one is fixed. I had to go under 2003 in mitchill to find the code p0179 and the wiring for this truck. That ecm fuse number 2* sent power to the FCM on this flex fuel truck. I found the module next to the fuel filter and check the Wiring harness for it up... Trouble codes: P0179.	7
	2004 Chevrolet Malibu 2.2L Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G1ZS52F04 we found out that the cat was under warranty. the car went to the dealer and the customer is going to let us know how things nwork out. thanks for all the help.	15
	2002 GMC Sierra 2500 HD 6.0L abs VIN: 1GTHK29UX2 We never could see anything funny with a speed sensor (using a lab scope too), but looking at data, found the left front dumping pressure. quite a few said replace the bearing instead of just sensor, so we went that way, when we removed the bearing, we found t...	38
	1990 Oldsmobile Toronado Trofeo 3.8L Radio / A/C VIN: 1G3EV13C7L Thanks for the help. I don't know, nor can I confirm whether or not the last 4 of the VIN will unlock the CRT unit. It is more than just a radio, it is the ATC and NAV unit with some type of theft unit. (Although, it did not keep the car from starting, nor did...	3
	2000 Pontiac Bonneville SE 3.8L Stall, MIL Lamp on VIN: 1G2HX54K8Y thanks for all the replies. i ended up changing the pcm and problem seems to be gone. i went with the pcm because i couldnt believe that i had 2 maf sensor that were bad and would cause the same thing. there must have been a short in the pcm to cause the maf t... Trouble codes: P0101 (Mass Air Flow Circuit Out Of Range).	7
	1993 Saturn SC2 1.9L Stall VIN: 1G8ZG1574P Well it has been over a week and the car is still running so I will say it is fixed. We had some great suggestions and I appreciate all the help. Most of the suggestions were basics and I like to reinforce them to the kids. I was frustrated that we never fou...	11
	2000 Saturn LS1 2.2L dash lights,security VIN: 1G8JU52F5Y HI techs, I replaced the bcm and all is well.The bcm did have to be reprogrammed by the dealer.Thanks to all who responded.	8

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