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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 13, 2004
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1987 Buick Regal GNX 3.8L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1G4GJ1179H
Car goes like a top fueler down the road, but also idles like one. Very rough, unstable idle. Problem only started after installing rebuilt engine. Prior to the rebuild engine had an occasional miss at steady cruise, which we were chassing with the ignition pa...
1989 Chevrolet K1500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, MIL Lamp on VIN: 1GCDK14KOK
this truck has a lean condition above idle idle o2 volts range from 82-.08 when you rev up to 1500-200 o2 sensor falls steady to 0 volts and stays there. disconect o2 and it goes to default. truck runs strong and powerful but idles poor and surges. we have rep... Trouble codes: 44 (o2 sensor lean)
1996 Chevrolet K2500 Suburban LS 7.4L transfer case VIN: 3GNGK26J2T
Vehicle started making poping noise when taking off from stops. The poping noise seems to be coming from under the driverside area and you can feel it in you feet. Also sometimes you can feel and hear the noise when coming up to a stop.Have allready greased th...
1997 Chevrolet Lumina 3.1L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 2G1WL52MV9
Vehicle arrived here with a check engine light (P0300 random cylinder missfire)and a ESC code. New plugs, wires, fuel and air filter already installed. The knock sensor was unhooked (ESC code explained). Noticable slapping noise at high idle was noted. Idles s... Trouble codes: P0300 (random cylinder missfire)
1998 Chevrolet Cavalier 2.2L Misfire, MIL Lamp on, CYL. 1 ONLY VIN: 3G1JC5241X
Car came in with check engine light on and tune up was performed. We compression tested the cylinders and all checked out ok. I switched spark plugs, wires, and coils and the miss stayed on number 1. Used my MODIS on the CKP sensor and the pattern was good. Us... Trouble codes: P0300 (random misfire)
1999 Chevrolet Astro 4.3L Hesitation, Misfire VIN: 1GNEL19W6X
Hey guy's tech lost needs help. Working on a 1999 chevy astro van. One of are first vans from a particuler fleet account.Came in for hessitation on acclaration and AWD light on also anti-loc light on.Checked for codes and found c0226,c0222,p0101,p0463,u1041,u1... Trouble codes: P0101, P0463, U1041, U1192, C0226, C0222
2002 Chevrolet Avalanche 1500 5.3L erattic shift VIN: 3GNEC13T02
this is an intermitting failure looses shift indicator, fuel gauge, tempature gauge, transmisson shifts poorly and will not shift into overdrive. codes indicate lose of voltage to transmisson and to dash unit. components ellimated (1) ignition switch (2) fuse ...
1997 Geo Tracker 1.6L No Start VIN: 2CNBE1367V
Hi fellow techs, I have a tracker here with no spark. Followed the cranks but wont start diagnosis and came up with a bad ignitor. The igniter can not be seviced, so a distributor was installed,I later found out a different shop put 2 distributors in this to n...
1955 GMC truck 307CID Firing Order
This engine is used as a power plant on an oil drilling rig. It is known to be out of a 1955 GMC truck. The engine is a straight 6 that is 307 cid. Someone vandelized the rig and pulled all the plug wires off. We can not find any information that shows correct...
1994 GMC Safari SLE 4.3L Surge VIN: 1GKDM19Z1R
Hi Guys, need some GM help. This van idles and drives nice at cruise. On accell once engine has warmed up most noticeable in drive, but does show up in lower gears, this thing starts to surge big time. Engine vaccum bounces from three to seven inches. EGR desi... Trouble codes: 32 (EGR Excessive Flow)
2000 GMC Safari SL 4.3L gauges/lights VIN: 1GKEL19W7Y
Customer compliant of eratic gauges fuel+alt. Lights on in dash when condition battery,low fuel+abs. Hooked up scan tool. Codes U1041 loss of ebcm/ebtcm communication and u1064 loss of bcm/ vtd,vim pzm,and or sbm data. Checked conditions of connectors under da...
1977 Oldsmobile 98 Regency 6.6L engine VIN: 3X69K7E128
yes hello i am a new technician at a chrysler dealership wll i have a problem with one of my personal vehicles.i am certified in brakes electrical i do not have a lot of major engine work experience.well my 1977 oldmobile 98 403 engine 400 turbo trans the car ...
2001 Oldsmobile Aurora 3.5L trunk VIN: 1G3GR64H11
Hey guys, so heres te problem. The trunk seems to have a mind of its own, it will open either by itself or when you open either of the two front doors. There is also a switch in side the car on the drivers door panel that opens both the trunk and the gas tank...
1994 Pontiac Grand Am SE 3.1L dome lights VIN: 1G2NE15M6R
vehicle towed in.no crank.charge battery.start vehicle,check charging system.no charging voltage and battery failed test.replaced battery and alternator.retest.starting and charging system now work.noticed no dome light.checked and found all bulbs missing.inst...
1995 Pontiac Trans Sport 3.1L low HVAC airflow VIN: 1GDMU06D9S
Vehicle came in with a faulty blower motor for the front AC unit. We replaced the blower motor and it now works, but there is VERY little airflow, regardless of whether recirc is selected or which vents are chosen, or heat or cold is chosen. I spoke to the cus...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Cadillac DeVille 4.9L heat
programer works fine.a/c still stays on no matter what what settings you put it at.can take rod from blend door,sill cold air compressor running.
1995 Chevrolet Lumina 3.1L shift cable or steering colum VIN: 2G1WN52M45
We fixed it today, removed lower dash panel,put plastic mat on floor to catch drips,from left side of collum, cleaned ball socket and slot with carb spray, blow out old grease, clean second time and relube with [...] lith grease, lube inside collum with 'JB 80...
1997 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52M6V
Thanks for all the great replies guys! Ended up being the igntion switch. To be honest really never took close notice of the warning lights while cranking. They have to be on or else the car will not start! This car would only lose the warning lights in certai...
2000 Chevrolet S10 4.3L MIL Lamp on VIN: 1GCCT19W61
Thanks to all who replied. the problem was finally traced to a chaffed wire near the bulkhead , repaired and road tested good .
2001 Chevrolet Silverado 2500 HD 6.0L turn signals
turned out to be a sort of combination problem.The multifunction switch cured the fast flash , but when you put the brake on they started flashing fast again.the service body had been fitted with a trailer adapter(in the begining unhooking this made no differe...
2001 Chevrolet Impala 3.8L Misfire, no power spark knock VIN: 2G1WF55K01
Thanks too all of you that replied. The fix for this car was very simple, Spark plugs were the problem.MY problem was when I pulled 2 spark plugs out#6 and#5 cly looked at them they were great.My fault that I did not check the companion clyinder#3 thats were t...
2002 Chevrolet Silverado 3500 8.1L intermitant p0743 VIN: 1GCJC33G82
thanks for all the replies. only one was correct. the tcc sol. was bad. when cold it ohm'd at 14.7 when hot over 25 ohms. it pulled so much current it would set the code and lock out reverse. this took some time to get to happen almost 90 miles of highway driv...
2002 Chevrolet Tahoe LS 5.3L Parking brake
Hello! Here is the help That I recieved. Valuable information. Sorry I cannot post a REAL fix as customer has not returned for further repairs. Rusty [...] When they are set up perfect, they barely function. I think it's a design problem with the self-a...
1991 GMC K2500 Sierra SLE 5.7L brake light in dash VIN: 1GTFK24K3M
after all of IATN's members' recommendations, we have finally diagnosed and came to a conclusion that the problem causing the 'red' brake light to come on was a faulty anti-lock brake module. after replacing the module & test driving the vehicle, the light cam...
2002 GMC Sierra 2500 HD 6.0L Fuel Tank Going Dry VIN: 1GTHK24U82
Customer had vehicle towed to dealership for warranty. Chances are it was that valve to the purge tank was plugged. Thanks to Linn for his help.
2003 GMC HUMMER 6.0L battery VIN: 5GRGN23UX3
ok many thanks for replies the fuse labeled info in fuse box in eng bay had the drain on it . on pulling fuse it no longer ran & remote locking wouldn't work unless fuse was removed it still wouldn't start . after ringing the dealer in florida that had servi...
1999 Oldsmobile Silhouette GL 3.4L Keyless entry FOB VIN: 1GHDX03E5W
Got 3 replies and the secret is that turning the ignition from lock to acc position must be done rather quickly within 1 sec. I was taking too long to turn the key back and forth. After I got the key moving at the right speed, it entered into the reprogramming...
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