GM Automotive Technicians Technical Discussion and Fixes for Jul 18, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1987 Cadillac Fleetwood 60 Special 4.1L Hesitation, Cuts out VIN: 1G6CS5186H O.K. GM guys,This one has alot of people stumped.The car has no power, It feels like your pulling a tractor behind you. it doesn't have any type of miss or backfire. old lady style(starting off real slow) it does fine.If you try to beat traffic and gun it and ...	View
	1988 Cadillac DeVille 4.5L Brake pedal VIN: 1G6CD5156J This car came to me with the customer complaining of ("brakes don't feel right"). Upon driving the car into the shop I can feel the brakes hanging up, I'm releasing the brake pedal and the car stops, doesn't roll. After a careful brake inspection I find, the l...	View
	1999 Cadillac DeVille 4.6L Instrument VIN: 1G6KD54Y2X This car came in running with an intermittent complaint of instrument warning lamps coming on including messages stating Antitheft was activated and Car may not restart,service airbag, etc. Also at this time fuel filler door would not work. Most of the time th...	View
	1999 Cadillac Seville STS 4.6L ebtcm VIN: 1G6KY549JX Hello again. I've got this STS and the traction control light and ABS light will come on intermittenly. 2 weeks ago I pulled a total of 28 different codes out of all computers. Talked to another mechanic and was told to replace the PCM. Had PCM replaced and re...	View
	1994 Chevrolet K3500 Cheyenne 6.5L Hesitation, Cuts out, Stall VIN: 1GCHK39F2R truck has had this problem for several months, intermittently while pulling a trailer on hot days ses and service throttle lights come on, speedo bounces erratically and engine loses power for only a few seconds, customer describes it as if you let off the acc...	View
	1995 Chevrolet Lumina APV 3.8L Hesitation, Surge, Cuts out, Misfire VIN: 1GNDU06L2S Need some vetran help! This van has a severe cut out on light accel. & is worse the hotter it gets. Using a snap-on scanner & taking a movie, I can see the MAF go to 0 for a few frames, the pulse width freeze at 6.4 & then goes to 30, the load percentage flucu...	View
	1996 Chevrolet Corsica 2.2L steering wheel VIN: 1G1LD5548T customer claims that on more than one occassion the steering wheel has locked on this vehicle while she was driving. Customer states to unlock she had to turn vehicle off then back on and the steering wheel was unlocked. we can not duplicate this problem while...	View
	1999 Chevrolet Venture 3.4L Poor Idle Quality, Misfire VIN: 1GNDX03E5X This problem has existed for many months and seems to be getting worse. There is a bad misfire in the system at all times. Even when the vehicle starts up cold the misfire can be felt. EGR system was checked. Code and check engine light reappear immediatly aft... Trouble codes: P0300 (random cylinder misfire detected)	View
	1999 Chevrolet Astro 4.3L starting VIN: 1GKDM19W6X Customer complains van wont start about once a weak. van has a couple of codes, p1626 anti-theft system fuel enable ckt. u1192 loss of passlock comm.i drove van all weakend happend 1 time. was not able to do much checking, it restarted after a few minutes, but...	View
	2000 Chevrolet Tracker 2.0L transmission VIN: 2CNBJ13C7Y wont shift out of 1st gear hot when cools for 30 mins works good till hot . no codes ,service trans check throttle cable moves free all dealers and transmission have not seen this kind of problems thank u for any hints what to check	View
	2001 Chevrolet Suburban 2500 8.1L Stall VIN: 3GNGK26GX1 Day 3 on this one. Customer complains of intermittent stalling. It did stall on me as I was pulling it into the shop on day 1, and again later that day after I had left the area for a moment. The truck has always restarted after it stalls like nothing is wrong... Trouble codes: P0706	View
	2001 Chevrolet Tahoe 5.3L don't know VIN: IGNEK13T51 I aligned this Tahoe about 2 months ago. First off, it has a salvaged title as the local dealer has a lot full of them. He calls them " light roll overs" and I have quite a time with some of them as far as getting them drivable. The customer came back yesterda...	View
	1998 Oldsmobile Achieva S 3.1L Vehicle Theft Deterrent VIN: 1G3NL52M2W This Achieva is driving me crazy and that isn't a long drive anymore. Last week I found the main computer ground was green, I cut the ends off the grounds, put a new end on the wire (soldering the terminal) and have driven it more than 100 miles since with no ...	View
	1999 Oldsmobile Silhouette Premiere 3.4L abs/tcs inop. VIN: 1GHDX03E0X Hi GM techs. Im in over my head on this one. I have this 99 olds van with abs/ tcs/ brake warning lamps on.I checked power and grounds and all seems ok, with key on eng. off. when engine is started, power from module that powers relay coil for abs/tcs, goes aw...	View
	1994 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HX52LOR This is a 1994 Bonneville with a 3.8L. This car will stall for no apparent reason. Also, when you are cruising at 55mph and ever so slowly accelerate you can feel a slight chugging sensation. Checked for codes and there are none. Customer has had a new crank s...	View
	1997 Pontiac Bonneville SE 3.8L A/C lines VIN: 1G2HX52K2V This car presents with a broken LF motor mount (on top of the transmission) and an a/c line that is snapped in two. We replaced the mount and the a/c line 2 days ago and it returns with the very same issue. All other mounts look fine. The engine runs fine and ...	View
	1999 Pontiac Sunfire SE 2.2L timing chain VIN: 3G2JB5243X This car came in as a lost power, died and wont restart problem - we cranked it over and it sounded like no compression and so we assumed timing chain but this seems like low miles for a timing chain failure - MOD is very lacking on tsb's and we found nothing ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2001 Buick LeSabre Custom 3.8L air vents VIN: 1G4HP54K51 The way we fixed the car was evac/rech but also talked the cust into an evap[which had a slight leak] and a manifold assmy; once fully charged car worked great. So even though we did put some freon in it first time we really needed to evac/rech with proper amo...	14
	1972 Cadillac eldorado 8.2L cv shaft VIN: 6L67S2Q402 Thanks to all that responded. The job went as everyone had described. After my father read all the posts it was enough to jog his memory and we did them in no time. Actually not that bad a job (just like most of the newer stuff found these days). Again thanks ...	13
	1963 Chevrolet corvette 327CID carburetor VIN: 30837G1159 I have the car back on the road. As I stated in the update that I had put the #76 jets in the primary side and the #71 in the secondary side of the carburetor. That was the cause of the too much fuel problem. I found that manifold vacuum is 7hg and I presently...	36
	1972 Chevrolet C10 5.7L system VIN: CCE142S149 thanks very much to all 17 replies, some of what we had already covered some not, but thanks to all who took the time to reply. we ended up replaceing the whole system with a kit from old air products, new condensor, pypass for original drier , new evaporator,...	17
	1990 Chevrolet Lumina 3.1L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 2G1WL54T5L Hey guys, Finally all my headaches are gone, for the time being. It turned out to be two shorted injectors on each bank. and a few days later an ECM. Shorted Injectors: I checked into specs about what the injectors should ohm out as and GM's Spec was 6 ohms....	21
	1999 Chevrolet K1500 Suburban 5.7L power accy circuit breaker A shorting VIN: 3GKEC16R0X Thank you to everyone that replied. After receiving help from others and thinking about this over the weekend, I decided to go into work today and find the splice pack S255 and figure out which wire is causing the short. I proceeded by removing the instrument ...	6
	2000 Chevrolet Venture 3.4L starter VIN: 1GNDX03E9Y sorry everyone this problem was self inflicted and very time costly. it turned out that there are two connectors three inches apart at the rear of tranny that can be swapped and i did it. thanks to all who replied. alls well that ends well.hope i can be a help...	4
	2001 Chevrolet Venture LS 3.4L turn signals cruise brake lamps VIN: 1GNDX03E51 we found the problem in u haul after market wiring harn unhooked for now told customer he needs to install factory style that hooks into harness he will bring back at a later date	8
	1997 Oldsmobile Bravada 4.3L code po740 VIN: 1GHDT13W9V I would like to say thanks to everybody that replied. Lane from Michigan suggested a possible tcc slip at idle. He said they should be less than 50 rpm's with tcc solenoid engaged. I checked and had less than 50. Eric from Oklahoma suggested a possible short t...	4
	1998 Pontiac Grand Prix GT 3.8L HVAC Blower and automatic headlamps VIN: 1G2WP52K3W The fix turned out to be an ignition switch. Took the switch apart and found carbon on three of the contacts. Replaced w/ new Delco switch and works great. Guess this is an electrical Gremlin that the GP's have. Special thanks to Paul Neerhof, schomischg@power...	9
	1999 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NW12E3X Customer decided not to fix the car. Thanks to those who responded. One suggested the crank might be broken, hence the unreliable signal, one suggested the trigger wheel for the crank sensor, and one said timing chain. We did find a silver dollar sized hole in...	3
	2000 Pontiac Grand Prix SE 3.1L pressure selonoid because this tranny was less than a year old,they sent us another remaned unit that we installed at all is fine.i wish i knew what was wrong with the old one,thanks for all your help	4

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