× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 16, 2006
International Automotive Technicians' Network (iATN) - Members Only
(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
1989 Chevrolet S10 Blazer Sport 4.3L brake lite VIN: 1GNCT18Z8K
When the battery is diconnected the brake lite will stay off for about 5 km. I have diconnected the wire at the e-brake and at the porportion valve. The ignition switch is supplying the power to turn on the brake lite. I have replaced the igintion switch with ...
1994 Chevrolet Corvette 5.7L No Start VIN: 1G1YY32P8R
After engine is at operating temp.and heat soaks for 20-30 minutes. Engine cranks for 5-8 sec. before starting,when cold fires immmeadiatly.Have replaced Ignition Coil Module and PCM.Power good at injectors at all times.With scanner hooked up when engine is cr...
1995 Chevrolet Lumina 3.1L Misfire VIN: 2G1WL52M1S
This car has a miss on No. 1 cylinder. If I take the injector conector from 1 and move it to number 2 cylinder then the miss also goes to number 2. I have ran a new wire from the ECM to the injector. I have rplaced the ECM. I have checked the injector connecto...
1997 Chevrolet Blazer 4.3L Cuts out, Stall VIN: 1GNDT13W7V
Hello This blazer is giving my customer some real problems. It will stall intermittenly, door locks will operate allday by themselves, no apparent problems. He has researched this problem via the internet and has come with the idea of replacing the ignition sw...
1998 Chevrolet C3500 Cheyenne 6.5L fuel tank transfer VIN: 1GDKC34F8W
hi folks, i'm having trouble locating information on fuel tank transfer module wiring & pinpoint testing information. i understand that the frame mounted module reads fuel level input from each tank then trips secondary lift pump as required but was wondering ...
1999 Chevrolet Metro LSi 1.3L No Start VIN: 2C1MR2225X
Hi, I hope their are GM Technitions out there who can help. Customer, Another shop, asked for help to reflash this vehicle ECU. Found this ECU was not reflashable. Ok now why will turn over, Crank, but no RUN. Ran the Tech 2 test found no codes and data was go...
1999 Chevrolet K2500 Suburban 7.4L Hesitation VIN: 1GNGK26JXX
We have this Chevy Suburban in here for a hesitation on light acceleration, say from a stop light then taking off. They also said that it seems to happen once in a while over 50mph when they give it more load. The problem is it is so intermitant that everytime... Trouble codes: P0107 (Map/Baro signal low or intermitant), P1107 (Same as above), P0327 (Knock Sensor Bank 1 Signal Low)
2000 Chevrolet Silverado 1500 5.3L fuel gauge message center VIN: 2GTEK19T7Y
This truck came in to us with a message center complaint. the fuel gauage will drop to empty and the low fuel light stays on as well as the message center starts flashing battery, low fuel, sevice 4wd, and security. sometimes if you shut truck down and restart...
2004 Chevrolet Silverado 1500 5.3L transfercase VIN: 2GCEK19T94
This tranfercase (246 np8)leaks at the gasket where the case halves join.Alldata shows how to take the rear case off but is not very specific.Also my questoin is can the rear case be removed or just seperated to clean and reseal,would be a lot simpler than rem...
1995 GMC Jimmy SL 4.3L Air Bag VIN: 1GKDT13W0S
Working on my daughter's vehicle before she goes back to college. Vehicle has never been in a wreck as far as we know. She has owned it for 5 years now. For the past 6 months, the ari bag light has been comming on intermittently. Seems to be more common when t...
1996 GMC Safari SLE 4.3L Mechanical VIN: 1GKEL19WXT
Hey guys and gals I can't believe that we are asking for help again. This safari came into the shop with the customer complaint that at highway speeds when touching the brakes it pulls hard to the left. We found nothing wrong but changed the brake hose and cal...
1997 GMC Savana 3500 4.3L No Start VIN: 1GDGG31WXV
Hi gang, I have read the numerous posts for this particular vehicle and have struck out thus far. The vehicle came in for died while driving and now no start. Vehicle has plenty of spark and WILL run on starting fluid. I have 63 lbs. of fuel pressure and tons...
1998 GMC Jimmy Envoy 4.3L blower motor VIN: 1GKDT13W6W
Hi everyone. This vehicle is getting the best of me. Customer stated that the blower would not operate and the ABS light would come on. I replaced the blower motor resistor and everything worked great. That lasted a day. Now the blower will occasionally work o...
2001 GMC Yukon Denali 6.0L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1GKEK63U71
Looking for known good CKP/CMP sync waveform, Search has not located anything truely usable, ordered A.C.E. CKP/CMP ref cd from AES but thats days few days off. [[...]} Trouble codes: P0336 (CKP signal error), P1336 (CKP variation not learned)
2001 GMC Sierra 2500 SL 6.0L Misfire VIN: 1GTGK29U91
Hi guys got a bit of an odd one. This 2500 has a semi-random misfire at idle. Genisys scanner shows misfires on cylinders 1,2,5,6,7 an average of 6 times (sometimes 2,4 or none) for every 100 misfire data cycles. Noticed a couple plug wires had some nicks in...
2004 GMC Envoy SLE 4.2L speedometer VIN: 1GKDT13S84
tachometer intermittently increases above engine speed and will stay high when engine is shut off. if you turn key on and off several times it will settle back to being acurate. speedo will be way high sometimes too. we have checked the main ground under conso...
1999 Oldsmobile 88 Royale 3.8L Interior Lights VIN: 1G3HN52KXX
The interior lights on this vehicle remain on for 15 minutes after vehicle is turned off and doors are shut. When connector C is removed from BCM, lights remain for 30 seconds and gradually fade out. Body control module has been replaced, no effect whatsoever....
2002 Pontiac Grand Am GT 3.4L Cooling Systems VIN: 1G2NW12E72
3.1/3.4 intake gasket WARNING! If you are using the tool to remove push rods without taking off the rocker arm, then be careful that the tool does not slip off the rocker! The valve will slam shut & could break off the head of the valve!

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52K4W
Thanks for all the help guys, it turned out to be the FP sensor reading higher then normal 'H20. After I replaced the sensor the reading went to O. I aslo informed the customer not to top off the tank to help stop raw fuel going into the solenoids. It has been... Trouble codes: P0446 (Evap vent solenoid blocked).
1999 Cadillac Catera 3.0L Electronic VIN: W06VR52R4X
I received 3 replies, one for ignition switch, the other two said to check the tailights, or trailer wiring. We had the cust. stop in, and there is no trailer wiring. I checked all the rear lights, and all looked ok, but I changed the bulbs anyway. I will post...
1983 Chevrolet C10 Silverado 5.0L high line pressure VIN: 2GCDC14H6D
The plunger that sits on top of the TV pivot linkage to lift the TV safety check ball was missing. David [...] nailed it. Thank you to all who responed.
1996 Chevrolet S10 LS 2.2L ac VIN: 1GCCS1949T
well this one is fixed. The compressor was faulty.this is a variable compressor with no low pressure switch. pressure is controlled by a wabble plate ( same purpose as a crank shaft but with the ability to change compressor displacement) the wabble plate or it...
1998 Chevrolet Malibu 2.4L water pump VIN: 1G1ND52T9W
i really appreciate all the input from all your wrenches..yes the timing cover and all the timing chain system removed..alot of work for a water pump, luckily the timing chain system was in good shape as client had limited budget..shame on your gm..
2002 Chevrolet Cavalier 2.2L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1G1JC12482
Well based on the testing all was good with fuel pressure. Except volume. The manufacture does not give a spec for this. I took and commanded the fuel pump on with the scan tool with the feed line into a bucket. A cup of fuel came out in a matter of 30 seconds... Trouble codes: P0440 (evap system leak), P1171 (lean condition during power enrichment), P0171 (system lean bank 1).
2003 Chevrolet Silverado 3500 LT 6.0L fuel gauge VIN: 1GBJC34U03
well you guys did it again,the fuel guage started working after i cleared the code,the speedo doesn't work though,the ipc seems to be problem,the customer declind the repair,thanks again.
1998 GMC K1500 Sierra SL 5.0L Harsh surging shifts VIN: 1GTEK19M1W
First of all thank- you very much to everybody who responded with advice to check fuel filter and pressure and cam retard and exhaust back pressure and all of that.I hooked a pressure guage to the line pressure port and monitored pressures when acting up and a...
1995 Oldsmobile 98 Regency Elite 3.8L No Start VIN: 1G3CX52K2S
Kenneth [...] hit it right on the head. Inspecting the intake after removeing the screen in the throttle body and presurizing the system. We found coolant leaking in the throttle body. The firing in the exhaust was what thru me. The other information I found...
2003 Oldsmobile Bravada 4.2L abs module VIN: 1GHDT13SX3
a great thank you to every one who helped what i finally did was clear the history codes and re tested and as soon as i started to drive the abs light came back on. checked code and co267 pump motor circuit is open , i had a look at the pump tested the motor f...
1994 Pontiac Grand Am SE 3.1L high idle at times VIN: 1GZNE15M0R
Car is Fixed, owner dropped car back off for additional diagnosis and we started by putting the TPS sensor on our vantage graphing meter and seemed well but still had intermittant high idle due to voltage drop out(spike). We know this due to at the time that t... Trouble codes: 22 (tps circuit signal voltage low), 28 (trans range switch error), 35 (idle speed error), 54 (fuel pump circuit low voltage), 7577, 82 (igntion control 3x signal error).
1999 Pontiac Grand Am SE 2.4L flywheel VIN: 1G2NE52TXX
Thanks to all who repaired. We pulled the trans and it was easier than it looked. Thanks again
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next