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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 22, 2005
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1991 Buick Park Avenue 3.8L Cuts out VIN: 1G4CW53LXM
Had a code 41 according to the scan tool it said to check the cam sensor and into the cam hole for the magnet. It looked to be ok. checked chilton manuel and it told me that to check the cam sensor terminal and that I should have 8 to 10 volts on terminals AB ... Trouble codes: 41 (cam sensor)
2002 Buick Rendezvous CX 3.4L lites VIN: 3G5DB03E92
head lites and parking lites won't turn off we are having trouble with some automatic lites on this buick . have tech 2 for testing inputs to body control modgule and all looks well . both parking lite relay as well as low beam relay stay energized till head ...
1988 Cadillac Seville 4.5L intake gaskets VIN: 1G6KS5155J
a small hole on one side and normall on the other side, in the center. which one goes on the front and which one the back
1989 Cadillac Eldorado 4.5L Starting VIN: 1G6EL1156K
This car has a problem with the starting system when I turn the key on the driver information center has this mesage(starting disabled due to theft system,wait 3 minutes)after 3 minutes the car will not star, there is not signal going to the starter,thanks Tho...
2000 Cadillac Escalade 5.7L Braking VIN: 1GYEK13R7Y
Completed front brake job, test drive before and after repair, had soft pedal just like air in the system, doesn’t pump up, or fade down. Aldata procedures kept referring to manual two person bleeding being the final and best procedure. We performed twice with...
1970 Chevrolet C10 350CID master cylinder VIN: CE140S1637
I have very little pressure from the front port of master cylinder. The original test drive I had pretty good brakes. I was suprised to find the front brakes were in the metal when I performed a 4 wheel brake inspection. All shoes worn out, all drums worn 0.12...
1993 Chevrolet S10 Blazer 4.3L No Start, Stall VIN: 1GNDT13ZP2
Engine stalls."THE INJECTORS ARE NOT PULSING" (both on open & closed loop).The fuel pump runs and has good fuel pressure. The ignition is putting out good spark. The computer is not setting any codes. The vehicle may run up to one hour without stalling.When th...
1994 Chevrolet C3500 Cheyenne 7.4L pedal VIN: 1GBKC34N6R
i have installed a clutch and a slave and a master all with oem parts and a pilot bearing and release bearing with aftermarket and have bled the system for at least 2 hours at the 45 degree angle. the clutch works perfect it goes in gear smooth and releases go...
1999 Chevrolet S10 2.2L Mechanical VIN: 1GCCS1442X
customer brought vehicle off lease. has rattle when shifting also noisy in netural at about 2300 rpm range. noise is more on top of eng than in timing chain area. removed valve cover insp push rods, vlv springs, rocker arms all ok, next removed front cover, no...
2000 Chevrolet Malibu 3.1L crankshaft VIN: 1G1ND52JXY
2000 Chevrolet Silverado 1500 5.3L abs light VIN: 3491YE6398
hey guys i have truck with abs code CO238 wheel mismatch i test drive the truck with scanner the front wheel speed sensors are giving a different speed to the rear wheel speed it is like 5-8miles difference i changed the speed sensor on the transmission.the tr...
1978 GMC C25 7.4L fuel gauge VIN: TCS248F730
the fuel gauge is pegged past full on both tanks. i suspect an open or a bad ground. my wiring diagrams only go back to 1982.does anyone have one for this 1978? i have cleaned both grounds near each tank.my fax number is [...] thank you in advance, bill...
2002 GMC Envoy SLE 4.2L No Start, Stall VIN: 1GKDT13S12
vehicle was hauled in for no start. customer stated that the check engine light was on for 1 day, the next day it would'nt start. vehicle will run with motor vac supply line hooked to fuel rail at 52 psi. replaced fuel pump, vehicle will start and run for 5 se... Trouble codes: P0171, P1275 (aap sensor 1 ckt problem), P1271 (aap sensor 1-2 correctional error)
2004 GMC Savana 1500 5.3L Cruise Control VIN: 1GTFH15T94
I need help! This customer has been badgering me for about 3 months to look into his inop cruise control. We had scanned it on a previous visit and could not find anything obvious. This time I scheduled lots of time and we just got a new Tech-2 and I figured I...
1998 Oldsmobile Bravada 4.3L No Start VIN: 1GHDT13WOW
Ok fellow techs...this truck came in on a hook...as a no start. When we tried to get into gear it would not go. We disconnected the linkage from the shift rod and pushed it in the shop. First we found that the security chip in the key was no good. Called the c...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick LeSabre Limited 3.8L head lights VIN: 1G4HR52KXV
a new headlight switch solved the problem, thanks for the input. Dave
2002 Buick Park Avenue 3.8L MIL Lamp on VIN: 1G4CW54K22
Thanks to all who responded. The consenses was rear O2 sensor. Several people provided me with a cold test that I had not known about. The test did not provide a failure. I replaced Sensor with GM anyhow and will run it. Problem is so random I am going to let ... Trouble codes: P0137 (O2 sensor low bank 1 sensor 2), P0440 (Evap Emission Fault).
1997 Cadillac DeVille d'Elegance 4.6L Hard start VIN: 1G6KE52Y9V
Thanks to John [...] for the advice, called the dealer and they turned me on to the bulletin number, replaced both cranks sensors and car performs perfectly. Thanks again
1998 Cadillac Seville SLS 4.6L Misfire, MIL Lamp on VIN: 1G6KS54Y1W
I appreciate all the good ideas. For example, both of the crank sensors were checked with vantage resulting in perfect wave form. I found a vacuum leak at the intake and pop-off valve. I sold the intake replacement to the customer. I pulled the intake to find ... Trouble codes: P0301 (Cylinder 1 missfire), P0300 (Random missfire).
1999 Cadillac DeVille 4.6L extended crank VIN: 1G6KD54Y7X
all of the suggestions were checked out by me either before or during testing but none of them had any effect on the problem. the customer took the car and i am still searching for the repair to this intermittent problem.
1995 Chevrolet Lumina 3.1L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 2G1WN52M75
After about of week of this car being in the shop, it is finally fixed. Contrary to popular belief, it was not the injectors, as mentioned, which were tested, it turned out to be the cam sensor, even though the car ran the same with it disconnect. Discovered t...
1996 Chevrolet Blazer 4.3L Hesitation, Cuts out, Misfire, Poor Fuel Economy
Hi and thanks to everyone for the replies, We had to wait until the owner had the funds to purchase a fuel pump/sender which was the ultimate fix. The pressures looked OK when he was testing but intermittently the pressure or volume must have been an issue. Th...
1997 Chevrolet Corvette 5.7L sterring wheel rotation sensor VIN: 1G1YY2260V
Out of 3 replies, 2 were right on. It seems that it is very common for the ebtcm to have an internal fault, and be sensitive to vibration. To recap, we kept getting a c1275 code for the steering wheel rotation sensor. 2 other techs had the same symptoms and ha...
1999 Chevrolet Express 3500 5.7L Excessive Emissions, Poor Idle Quality, Stall, Misfire VIN: 1GCHG35R7X
thank you all your time,unfortunately my techinican did not do a complete compression test,we found a bad exhaust valve in cylinder #6,we believe this is causing our misfire in cylinder #5 & 7,once again thanks for all your input
2000 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC1241Y
Thanks for your help. The problem with this car was the ignition feed power wire to the ignition module. The problem was at the 38 pin connector in the bulkhead. The way i found it was the 7x signal was not making it to 7volts all the time unless i took the co... Trouble codes: P0336, P0340.
2002 Chevrolet S10 2.2L Misfire VIN: 1GCCS14512
This one is fixed! Had to replace 3 of the 4 injectors. Once again, iATN has come through. Most of you hit the nail on the head. I really didn't suspect the injectors after performing the injector balance test, but then again it's hard to do a test like that d...
2003 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 2GTEC19T23
last night i thought about it, after i got my head out of my a$$ i pulled the exhaust loose and it was fixed... i read the replies this morning and 4 out of 12 got it right...it is very odd that i get replies to do what has already been done...after stating th... Trouble codes: P0300 (random misfire), P0101 (maf out of range), P0756 (shift sol. b per. or stuck off).
2001 GMC Sierra 2500 HD SL 8.1L No Start
Customer opted to have fuel pump and crk sensor replaced. If you compare image [24725] to image [24769] you will see a completely different pattern. I am confident that the new pump and crk sensor will cure the intermittant no start. Thanks to all who took tim... Trouble codes: P0335 (crk sensor ckt fault), P0700 (TCM mil request fault), P1781 (eng torque or mil request fault), U1041 (EBCM loss of serial data communication).
1997 Oldsmobile Bravada 4.3L Hesitation, Misfire VIN: 1GHDT13W6V
Thanks to all who were generous enough to share their expertise. We successfully installed the distributor with the suggestions that were given and the customer is happy.
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