GM Automotive Technicians Technical Discussion and Fixes for Dec 1, 2005 - iATN (Members Only)

×

Join Now

Prev	Professional Automotive Repair Technical Discussions for December 1, 2005 International Automotive Technicians' Network (iATN) - Members Only	Next
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM

	Help Request	Answers
	1994 Buick Regal Custom 3.8L No Start, Cuts out, Stall, dies when warm VIN: 2G4WB55L3R vehicle starts and idle fine drive about 8-10 miles vehicle will die and not start until cool.	View
	1994 Chevrolet C1500 Suburban 5.7L Misfire VIN: 1GBFK16K5R #3 is dead, good compression, plenty of spark, vacuum waveform looks great which in my mind rules out just about everything mechanical. Smoked it and no vacuum leaks. disconnected booster and all other vacuum lines. injectors spraying good. ALL OTHER CYLINDERS...	View
	1997 Chevrolet Monte Carlo LS 3.1L Dash lights VIN: 2G1WW12M5V Car came in end of the day today. No dash lights and no light in console for PRND12. Vehicle has headlamps and taillamps. Additionally, radio lights up when lights are switched on and dim with rhestat switch. Checked socket at shifter bulb and have no signs of...	View
	1997 Chevrolet Express 2500 4.3L Hesitation VIN: 1GCFG25W5V Hi Guys, Please help me out here. I have a Chev Express van that is giving me fits. About 2 months ago the customer complained of a lack of power on accel. They took the van to the dealer and the dealer put on 3 new o2 sensors (all but bank 2 sensor 1) and a n... Trouble codes: P0135 (o2 sensor 1-1 heater circuit)	View
	1997 Chevrolet Astro 4.3L Misfire VIN: 1GNEL19WSV my conclusion is low fuel pressure under load is causing number six pop it injector to hang up ??? vehicle runs fine untill hard load applied then #six cylender begins to miss also #4 misses but not nearly as bad fuel pressure drops to just below 55 psi and v... Trouble codes: P0300	View
	1997 Chevrolet Tahoe 5.7L long crank VIN: 1GNEC13E6V This truck runs & starts great for me every time. The boss says it did it once for him. unfortunately, that was when the fuel press guage was not on it. The fuel pressure is in spec & holds good every time I check it. Is ther any history of intermitant failure...	View
	1997 Chevrolet K1500 Cheyenne 5.7L transfer case VIN: 2GCEK19R6V Hey, I'm kinda stuck on this one. When driving in 2 wheel drive the truck makes a bad gear grinding noise on medium acceleration. When I let off the gas it goes right away. If I accelerate slower it seems not to happen. The noise feels like its right under my ...	View
	1998 Chevrolet Lumina 3.1L tcc VIN: 2G1WL52M7W Mother in-law came in for general maintenance (LOF,trans and cooling system services,rotate,balance,brake inspect) and SES light on continuously. She had no "driveability complaints". DTC 1870 stored so I checked freeze-frame data: engine load 30%. Coolant 198...	View
	1998 Chevrolet C1500 Cheyenne 4.3L No Start VIN: 1GCEC14WXW Towed in on a hook. ECM-B Fuse blown,replaced fuse & returned to customer. Next day it blows again, go out & replace fuse, drive it back to shop & run for 30 minutes, while inspecting & wiggling fuel pump wiring, No problems found. Start truck this morning & b...	View
	2000 Chevrolet Silverado 1500 4.3L fuel gauge VIN: 1GCE19W4YZ Hello all you GM guru's, I need help with this one. The fuel gauge does not work, the temp gauge is inop, the message center flashes a battery icon with a low fuel message. This is what I have found. My scanner, Modis and Mentor, reading the pcm sees 14.2 vol...	View
	2001 Chevrolet Silverado 2500 6.0L Transfer case VIN: 1GCGK29U41 Greetings GM wizards. This 01 with a 246 transfer case came in for a faulty fuel sending unit in the tank. Between ordering the sender and getting it put in we had a nasty ice storm that made all the roads here into giant hockey rinks and when we went to test ...	View
	2001 Chevrolet S10 4.3L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCCS14W61 pinch off both pressure and return fuel hoses to find system still drops- removed upper intake to find pressure reg. leaking- replaced reinstall intake- runs ruff- misfires- rechecked fue pres. still droping off- removed intake to find all injectors plugged wi... Trouble codes: P0300	View
	2002 Chevrolet Silverado 2500 HD 8.1L Code P0708 VIN: 1GCHK29G32 Hello all...this is my personal vehicle and Its kicking my butt. The dash display and the auto doorlocks Dont always unlock, they have been acting up for sometime on and off. Never got the time to fix. Untill the truck banged into gear and set the mill. Checke...	View
	1993 GMC Jimmy SLE 4.3L No Start, Stall VIN: 1GKDT13W9P Truck towed in due to stall and no restart. Customer stated truck has been stalling more often and getting harder to start each time. Next day I hit key and truck started immediately and settled into decent idle. Ran for half an hour and I took for test drive....	View
	1995 GMC Safari SLE 4.3L Excessive Emissions, Poor Idle Quality, Surge, Poor Fuel Economy VIN: 1GKDM19W1S Vehicle came to us as a fail test. (IM 240) This vehicle is running very rich at an idle and at cruise. Checked fuel pressure and it was in spec and did not leak down. It will run rich untill fuel trims drop drasticaly then will go into fuel control. O2 works ...	View
	2002 GMC Yukon XL 1500 SLE 5.3L No Start VIN: 3GKEC16T11 This vehicle eventually starts but cranks a long time or must crank several times before starting. Check with A/C Delco Tech Support and they have been helpful but problem still not resolved. They beleive we have a ground issue. We have check and cleaned all g... Trouble codes: U1041	View
	1998 Pontiac Grand Am SE 2.4L bleeding VIN: 1G2NE53T6W already given	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1985 Cadillac DeVille 4.1L engine VIN: 1G6CD6980F Thanks guys for all your help. The problem causing this particular Cadillac to not shut down was a bad alternator. Replaced and was fine. Thanks again.	20
	1997 Cadillac Seville SLS 4.6L radio, display in VIN: IG6KY529XV I have now installed the fifth body control module. I let the car set for a week and it started right up. customer is happy? The dealer had installed the other body control modules over a period of seven years. Go figure...I can't	4
	2002 Cadillac Escalade 5.3L abs VIN: 1GYEK63N32 had to send vehicle to gm & have ebcm reprogrammed for 23 inch tires, seems to have fixed code problem	1
	1994 Chevrolet Caprice Classic LS 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire VIN: 1G1BN52W1R thank's to a couple of member's and a good friend @ a dealership the vehicle is fixed. the guy @ the dealership said yes you probably have skewed knock sensor's but to also replace the knock sensor module inside the pcm(look's like a prom) and have the vehicle...	7
	1995 Chevrolet Blazer 4.3L Stall VIN: 1GNDT13W5S thank you everyone for your help. especially paul [...] who hit it right. the injector connector had a relaxed fit on it causing a poor connection. we cut the pigtail off and soldered in another and she is running great! thanks again everyone!	15
	1996 Chevrolet Tahoe LS 5.7L No Start VIN: 1GNEK13R0T Thanks every one for all your info. Your comments did help. Got more info. from customer. Found that the starter fail due do excessive cranking. Customer replaced starter prior to bring tahoe to the shop. When Tahoe was brought on the hook to the shop the fuel...	16
	1997 Chevrolet K1500 5.7L Excessive Emissions, Poor Idle Quality VIN: 1GBEK19R7V Thanks to all who replied on this one. Sorry for the delay as the customer was the hold up. He brought me a used upper and lower intake intact. I removed the spider out of it and installed it in the truck. Still ran fat for awhile but after a good warm up it c...	17
	1998 Chevrolet Venture 3.4L MIL Lamp on VIN: 1GNDX03EXW thanks to all who replied god ideas but the fix for this one and i hate to admit it was the bosch 02s we used were just plain lazy compared to the delco i dont know who makes delcos 02s but it looked alot different it had 3times the vents im usualy not a perso... Trouble codes: 1133 (lack of 02 switching).	8
	1998 Chevrolet Venture 3.4L door locks VIN: 1GNDUO6E1W this van can be a electrical night mare the passeger side carpet fills up with water and there is a lot of wiring that pass through that area the area where my problem was right side under the carpet just as it goes up the firewall 8 wires were melted together...	8
	2001 Chevrolet Impala 3.4L MIL Lamp on, fALSE CODE??? I'm going to call this one 'fixed', simply because we have not heard one word from customer since I posted the help request, and I'm sure if the MIL came back on, we'd hear about it pronto. Many of the replies were helpful, including complete flowcharts; I h... Trouble codes: P0401 (low EGR flow detected).	15
	2004 Chevrolet Impala 3.8L No Start VIN: 2G1WF55K14 Thanks everyone for you replies. Special thanks to Peter from FL and Gene from Nebraska. After replacing module again we checked kv and found 1 plug wire with very high kv. We replaced all plug wires and all seems to be well after 50 miles of test driving. Tha...	6
	1993 GMC K1500 Sierra SLE 4.3L Surge VIN: 1GTEK14Z3P Thanks to Rich [...] for the help. You hit the nail on the head. The ground between the firewall and engine looked good, but crumble when I touched it. Replaced ground, all is well. Thanks again, IATN is a lifesaver.	13
	1999 Oldsmobile Intrigue GL 3.8L suspension VIN: 1G3WS52K5X Didn't get to fix this one yet. Customer declined any further diagnosing or repairs at this time. I used electronic ear on strut mounts & hubs & control arms, & cant pinpoint the noise. Thank you for the replies. Greg	7

(Also Available: All, Asian, Chrysler, European, Ford, GM.)