GM Automotive Technicians Technical Discussion and Fixes for Aug 26, 2004

Join Now

Prev	Professional Automotive Repair Technical Discussions for August 26, 2004 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
	1988 Cadillac Fleetwood 4.5L multiple electic devices VIN: 1G6CB5154J This caddy shuts down many components after it warms up. All at once the following turn off: fuel data center, digital cluster, climate control (but compressor still cycles), radio, and wipers. I searched all the wiring diagrams. G100, G101, and G200 are goo...	View
	1961 Chevrolet CORVETTE 283CID hard hot restart VIN: 12345678NA does anybody have access to location of jets in a 61 corvette 2 4bbl setup .shoul;d the larger jets be in the primary side. when we took thes apart both carbs had larger jets in primary side . i can't remember if this is right or not . i thought the smaller je...	View
	1987 Chevrolet S10 Blazer Sport 2.8L Must manual shift for overdrive VIN: 1GNCS18R7H Hi guys, This is my personal work vehicle but I'm not too sharp when it comes to automatics. What's happening is I have no drive with OD selected, but it's fine when you put it in regular Drive. However when I'm up to speed, (like over 45), I can shift it int...	View
	1990 Chevrolet Lumina 2.5L backfires VIN: 2G1WL54R8L attempted to start vehicle after third try it started and backfired through exhaust.idles good but when snapping throttle backfires through intake,removed air filter housing assy from throttle body,found black soot everywhere which then led me to believe to mu...	View
	1995 Chevrolet Tahoe 5.7L a/c VIN: 1GNEK13KOS A/C Changes From Cold To Hot, Dash Controls Switch From Normal A/C Vents To Defrost+Heat. It Only Happens On Hills + Acceration . Works Ok At Idle + Steady Cruise On Road. Checked ALLDATA + Dealer On Help? Thanks,Colburn Brothers	View
	1995 Chevrolet C-70 366CID Fuel Pressure VIN: 1GBJ6H1P5S Thank you for any help. We normally do not see these big trucks but found several problems and repaired them with great results. However, it still is running lean and we have about 30 to 32 psi fuel pressure and need to know if this is within specs before goin...	View
	1997 Chevrolet Lumina 3.1L engine VIN: 2G1WL52M2V Engine has noise in rear valve cover area or front cover area, it's hard to tell. it sounds like a lifter tap with a scraping thrown in. I hope someone out there has some thoughts before we start tearing away. thanks in advance.	View
	1998 Chevrolet Monte Carlo LS 3.1L Unknown VIN: 2G1WW12M7W Sirs, I hope some of you Chevy techs can help with this one. Vehicle has no cold air. Parts replaced at another shop include: Compressor, Drier,Orifice,Condensor. The pressures are all over the place and I'm guessing it's the Variable Displacement valve in ...	View
	1998 Chevrolet C1500 Cheyenne 5.7L excessive noise VIN: 2GTEC19R1W Hi everyone. I could use some help with a bad fuel pump noise. the fuel pump is whining like most gm pumps do in this generation truck. but the weird part is that the fuel lines are resonating the noise of the pump up to the intake manifold. I can feel and hea...	View
	2000 Chevrolet Venture 3.4L temp guage VIN: 1GNDX03E5Y van is used by local caterer, temp guage never went over 1/2, the other day in traffic it went almost into the red, running it in the shop overheat was varified,the cooling fans did come on at 225 degrees.we replaced the thermostat, the overheating is fixed bu...	View
	2000 Chevrolet Suburban 1500 5.3L Coolant loss VIN: 3GNNFK16T2 Customer bought vehicle 6 weeks ago. Shortly after it needed coolant topped up once a week. We pressure tested and found no leaks. He then drove and monitered, found low coolant light come on every 3-4 days and has to fill with 3/4 galon of coolant. We pulled ...	View
	2002 Chevrolet Impala LS 3.8L wiper VIN: 2G1WH55K42 Hi folks! These wipers are driving us crazy! They intermittently park up, stop in up position on intermittent. Tab from wiper frame is in proper position, updated park arm installed, re-installed, rechecked, rechecked! - Now, 50% of the time it will park prope...	View
	1997 GMC Yukon SLE 5.7L PRNDL light VIN: 1GKEK13RXV PRNDL light is inop. Using an MT2500 found code P1870 - undocumented code. Test drive showed trans to be shifting ok. Tested power to the PRNDL fuse - ok. Checked fuse - ok. Nothing in our Mitchell Manuals on diagnosing this system or any explination of how it...	View
	1998 GMC Sonoma SL 2.2L No Start VIN: 1GTCS1447W hello, this truck was in a flood.in heavy rain,the water rose up to about 6 inch below the bottom,of the side window.the bcm was summerged in water.it dose not appear the pcm was summerged.the spark plugs were remove & engine spun over to clear any water. the ... Trouble codes: U1000 (no class 2 communnication), P1632 (theft deterrent system-fuel disable)	View
	1990 Oldsmobile Delta 88 Royale 3.8L Surge, Cuts out, Stall, MIL Lamp on VIN: 1G3HN54C5L ok here's the deal with car, customer calls and complains that the car is cutting off constantly, car stalls and will restart immediatly, snapon mt2500 will not comunicate with car, check all fuses that are known to me for this. and no luck, looked at all powe...	View
	1993 Oldsmobile Silhouette 3.8L MIL Lamp on VIN: 1GHDU06L7P Good morning all, Installed a new A/C compressor on this van 2 weeks ago. Customer takes vehicle on vacation, everything working fine, stops to fill gas tank and when he restarts van the SES light comes on and A/C will not cool.I checked all my work around the... Trouble codes: 17 (Crank rpm signal shorted), 47 (uart link problem), 26 (Quad driver module failure), 56 (quad 2 problem)	View
	1999 Oldsmobile Alero GL 2.4L Poor Idle Quality, MIL Lamp on This car came in on a hook - low fuel pressure - replaced pump. Car came back after dying w/driving - ran out of gas. Put gas in car and sent on. The next time I see this car P0105 code set - CEL on. Checked car and replaced TPS along with plugs (had Bosch) an... Trouble codes: P0105 (tps / map)	View
	1995 Other GM 16 pass bus 5.7L Stall VIN: 1GBKH32K7S The complaint that brought this unit in was dieing at idle sometimes (most of the time). I originally was not looking at this one and only suggested from the sound of things to check the fuel filter. It was slighty plugged and changed for maint. and to be able...	View
	1997 Pontiac Grand Prix GT 3.8L Air Bag Module VIN: 1G2WP12K4V I an trying to replace the ignition lock cylinder because it will not turn. In order to remove the air bag the Mitchell says to use a flat bladed screwdriver to release 4 leaf springs on back side of steering wheel. This is where I am having difficulty. I can ...	View
	1999 Pontiac Grand Prix GTP 3.8L MIL Lamp on VIN: 1G2WR5211X vehicle came in for a "chuggle" at steady speed, with no codes in memory. we had already done a motor vac in past, which got rid of the code po300. we went to check spark output of the wires, coils etc. & a backfire occured, with an engine stall.it started bac... Trouble codes: P0341	View
	1995 Saturn SL2 1.9L Excessive Emissions, Poor Fuel Economy VIN: 1G8ZK5273S Hello and thanks in advance for your help. Customer complained immediately after we installed a reman engine that she could not pass the VET. We did not hear from her for 3 months. She brought the car back after having replaced her catylitic converter, O2 sens...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1988 Cadillac DeVille 4.5L stating system VIN: 1G6C05155K thanks for the advice guy but this car dose not have a relay so i landed up rewiring thr ign system the car is running and good buy one of those that can only cost us money and not the customer once again thanks to the guy that responded paul	2
	1991 Chevrolet Lumina Z34 3.4L Excessive Emissions VIN: 2G1WP11X92 hi run out of time on this one,customer will get a conditional pass,thank you for all helping.	10
	1995 Chevrolet Blazer 4.3L Excessive Emissions, MIL Lamp on VIN: 1GNCS13W5S OK guys, the fix is in! Sometimes you must get a little rest and think things over. The re-recheck was the key to the problem. I went to the right rear head and looked at the ground wires there. The wires were bolted to the head, but the tan wire (O2 sensor LO... Trouble codes: 13 (o2 sensor circuit).	3
	1992 Oldsmobile Cutlass Supreme S 3.1L No Start VIN: 1G3WH14T6N a big thanks to all that replied-stan, don, carl, sam, and knottheboss. as previously stated, ignition mod was no spark problem, timing chain had sliped and was remainder of problem. sam [...] hit with rpm discrepencies. car has not had gm update-no sticker a...	5

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