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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 2, 2005
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Open Help Requests for GM
Help Request Answers
1997 Buick Regal LS 3.8L ABS amber lamp on and TC disable light VIN: 2G4WB52K1V
The scan tool I am using is a Snap-On Modis. When I first drove the car in the code in memory was C1226 RF speed sensor erratic. I erased the code and proceeded to test drive it. I notice the at 20-30 mph steady state throttle the traction loss lamp would occa...
1998 Cadillac DeVille 4.6L theft system on VIN: 1G6KD54Y1W
this 98 caddy came in for a battery and now that I've changed it the car won't start. I checked for spark (which is there) and than for noid (no noid). seems to me that the theft system is armed. have excellent fuel pressure and spark but will not start unless...
2002 Cadillac Escalade 5.3L stability system VIN: 1GYEK63N82
to all you great techs and soon to be great techs, we have this escalade in and just replaced the transmission with gm unit. reverse had gone out. now, the "service stabilty system" message is on. cust. states it was not on before wrecker picked it up. I don't...
1989 Chevrolet S10 Blazer Sport 4.3L Poor Idle Quality, Surge, Cuts out, Stall, MIL Lamp on VIN: 1GNCS18Z4K
this blazer seems to have a mind of its own. sometimes it will run great for a few minutes, then itll act possessed by something. it starts kicking and bucking and will finaly stall if you do not keep your foot on the gas. i tap tested the ecm, replaced distri...
1994 Chevrolet Astro CL 4.3L Mechanical VIN: 1GNDM19W8R
we have a 1994 chevy astro van. we have replaced the power steering pump. we replaced front and rear brakes. we replaced front brake rotors and we replaced brake hardware kit. we have replaced the master cylinnder. we still have a hard brake pedal. please help...
1994 Chevrolet Lumina APV 3.1L ignition switch - neutral safety switch
Hello fellow techs. I could sure use a hand on this one. This van will burn out ignition switches and or neutral safety switches or both within a couple of days of repair. It has been to different shops and has had all the same things tested with no problems f...
1995 Chevrolet S10 LS 4.3L No Start, Stall VIN: 1GCCS19W0S
Thank you in advance, Fellow Techs! This Vehicle was towed in as crank/no-start. Ocsilloscope pattern and pressure tests DEFINITELY condemned the fuel pump. After replacement, the vehicle has fuel pressure 88 lbs. deadhead/62 lbs. KOEO. Here's the dilemna: It...
1996 Chevrolet Blazer 4.3L 4whd VIN: 1GNDT13W9T
hey gm gurus: I have a problem with an s10 4whd blazer. It is staying in 4wh high or 4wh low. It will not go into 2wh drive. I have replaced motor, module, servo, vacuum switch; cable is okay. have tried disconnecting 4wh actuator switch and vacuum vent switch...
1997 Chevrolet Cavalier 2.2L warning lights, temp, gauge and running lights VIN: 1G1JC5245V
well, not sure where to start, car came in with dash warning lights on instrument cluster lighting up intermittantly while driving , also the temp gauge goes to full low range and driving lights flash on and off if in bay in park, I pulled codes and have sever...
1998 Chevrolet Blazer 4.3L Transfer case VIN: 1GNDT13WXW
Hello Everyone, This vehicle came in because his 4x4 would not engage. His indicator lights on the dash would show it in 4 wheel drive but the front differential wasn't engaging. I ran the transfer case functional test and it failed the last step where codes w...
1999 Chevrolet K2500 5.7L no start VIN: 1GTGK29R6X
Hi. I good a no start condition. The engine turns over but it want to turn over hard at times or like is out of time. Check valve timing and cam timing ok. I wants to fire but will not go. Some times it will fire up though the intake. I am get rpms on scan too...
1999 Chevrolet C1500 Suburban 5.7L Cuts out, Misfire, MIL Lamp on VIN: 3GNEC16R1X
i recently overhauled the engine. it ran about 2000 miles with no problems. then i got a bad crank sensor code ireplaced that. then no more problems for a couple of weeks then it started cutting out at about 2600 rpms to 3200 rpms .thats when i started getting... Trouble codes: 339 (crankshaft pos sensor intermittent)
2001 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCDT13W41
Thanks for your help and imput. The first time, the P0401 code set before we did not even get out of town before the light reset. Pump & check valves ... and as per fix data base ... said it was done. Nearly half a tank of gas burned out proving that the lig... Trouble codes: P0401 (2ndary air injection)
2002 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Hesitation, Stall, Misfire VIN: 3GNEK13T02
Vehicle came in severlly overheated, to the oint where it would barely run. The truck has had a supercharger and computer upgrade for about a year with no glitches. Over heat was caused bu no fans coming on. Truck was so hot that valve guides were demo'd and n...
2002 Chevrolet Impala 3.4L Hesitation VIN: 2G1WF55E42
Vehicle came in for loss of power under load. Transmission shop has eliminated transmission. During road test the car has no power. It feels like a plugged converter. We thought the fuel pump wasn't delivering proper flow , so we changed the pump. It still has...
1999 GMC K3500 Sierra SLT 5.7L front axle VIN: 1GTHK33R9X
Hello,this tk will engage the front axles while driving at highway speeds with no driver input. The first time, after looking things over,I replaced the transfer case switch. It worked OK for over a month. I had also spun out the actuator & looked inside. This...
1987 Oldsmobile Delta 88 Royale Brougham 3.8L Stall, MIL Lamp on VIN: 1G3HY5133H
Greetings fellow techs.I have been playing with this one now for two days with no conclusive evidence.the car is running extremely rich.Rich enough that on a road test it blew the muffler off.Fuel pressure is 32 psi at idle and the regulator is not leaking.Car... Trouble codes: 34 (maf sensor)
1994 Pontiac Grand Prix SE 3.4L MIL Lamp on VIN: 1G2WJ12X4R
this car pisses me off! i have done all the checks per alldata, everything pointed to bad ecm, replaced ecm same code and check engine light. car came in for check engine light coming on, scaned car, found code 1640 only, quad driver a problem, this driver onl... Trouble codes: 1640 (quad driver a failure)
1998 Pontiac Sunfire GT 2.4L Poor Fuel Economy, cooling fan VIN: 1G2JD12T7W
Hi guys! This one came in sometime back with a no heat problem. After looking into it we found that the cooling fans were on all the time, hot or cold and the heater controls would be off. We replaced the relay and that seemed to help, at least they weren't o...
2001 Pontiac Montana 3.4L rotors/pads VIN: 1GMDX03E21
Customer complained of intermittent severe front end shudder, especially on braking. Left front hub had exceesive play and was replaced. Right front rotor was heat cracked in several places as were the pads. Front pads and rotors were replaced although not wor...
1997 Saturn SL 1.9L MIL Lamp on VIN: 1G8ZFS286V
This car came in with a p1404 egr pos. error. The valve had extensive carbon buildup. It was open 12% with .88 V on the pos. sensor wire. Cleaning it did not lower the voltage. After replacing the valve, it was open 7% with .76 V on the pos. sensor wire. Accor... Trouble codes: P1404 (egr pos. incorrect)

Fixes & Summaries for GM
Fix/Summary Answers
1972 Chevrolet corvette 5.7L wiper system
thank you to all who replied a special thanks to chris from calif who has a very detailed wiring diagram on this system. the problem ended up being the wiper switch was plugged in upside down every time we would unplug the switch that is the way the connector ...
1999 Chevrolet K1500 Suburban 5.7L No Start VIN: 3GNFK16RXX
Overwhelming responses to check the connector plug at the fuel pump and ground wire-- This time the technician took a close look at plug and noticed one of the connection terminal plugs looked larger than the others. Perhaps when checking for power at this plu...
2000 Chevrolet Prizm 1.8L dome light fuse VIN: 83YZ431700
Thanks for the help. The draw had disappeared. I had narrowed it down to the chimmer module on the fuse panel and had orderd one and then the draw returned with the module unplugged. So I did some more testing the next day and it was gone. So I replaced the mo...
2001 Chevrolet Malibu 3.1L security lite VIN: 1G1ND52J21
most of the helps sugested replacing the pass lock sensor. we did this and did a relearn for the new pass lock swith. the lite still stayed on. we called our local gm dealer and they we able to access the bcm. they cleared it's memory and comanded it to relear...
1989 GMC G3500 Vandura 5.7L MIL Lamp on, LACK OF POWER VIN: 2GDHG31K2K
Thanks to everyone who replied. Most suggestions regarded base timing, modules and PCM's. These were all tested as good, however the problem (code 42 EST) still existed. As it turns out, the wiring going to the PCM goes under the outside of the vehicle then to... Trouble codes: 42 (Electronic Spark Timing problem).
2002 Oldsmobile Silhouette GLS 3.4L right slide door VIN: 1GHDX23E71
Hello everybody, on this olds van I disconnected the power acuater to see if it would grt rid of the problem, It still would lock up and had same problem. Roy from Indiana had same problem on a transport van, I replased the 400.00 latch like Roy did on his and...
1998 Other GM Corsa B 1000CC preformance VIN: WOLOSBF08W
Dear All, Thank you all for all the kind information that you have sent to me regarding this vehicle. I have tried all that has beeen sugested & more but so far to no avail. I am at present still working on the machine & I have sent the E.C.M. away to be teste...
1990 Pontiac Grand Am SE 2.3L Cuts out VIN: 1G2NW54D4L
First I want to apologize to the group for NOT including all the information in my original post, I kept the message as simple as possible to eliminate excessive data loading to the iATN server and all I needed to know was the coil primary resistance specs as ...
1992 Pontiac Grand Am SE 2.3L Oil consumption and pressure VIN: 1G2NF5438N
Well, we found the source of the excessive oil consumption on #1 cylinder. Kent [...] was the closest with his mention of the oil passage to the head being near the #1 cylinder. To verify our theory that oil was being forced into the cylinder via the head ga...
1996 Pontiac Bonneville SE 3.8L Heater VIN: 1G2HX52K3T
Thanks to all who responded. You all were on the money. we removed and opened the heater core and found it half pluged. We changed the heater core and the heat is perfect. Thanks again.
2001 Pontiac Grand Am SE 2.4L starter VIN: 1G2NF52T81
replaced the ignition switch on this on as several e-mails suggested. customer has been driving this vehicle for a week and a 1/2 with no problems. thanks for the help
1997 Saturn SW1 1.9L No Start VIN: 1G8ZG8285V
thanks to all who replied. the problem turned out to be a defective new crank sensor! We checked all the wires at clutch pedal still had no output signals from pcm had crank signal but out of frustration tried new crank sensor and bingo starts and runs great. ...
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