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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 27, 2007
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Open Help Requests for GM
Help Request Answers
2000 Buick Century Custom 3.1L complete system VIN: 2G4WS52JAY
The customer came in a week ago for an oil change. at this time our oil change tech called me over to look at the coolant. It was contaminated by oil. I checked the transmission for signs of coolant. their was no signs of antifreeze cross contamination. The en...
2000 Buick LeSabre Limited 3.8L No Start, Stall VIN: 1G4HR54KXY
Customer says car will always crank over but some times will not start. Stalled on customer one time driving to store. Did not start on me once but started after getting scan tool. Trouble codes: P1626 (Theft Deterrent Fuel Enable Signal not Received), P1630 (Theft Deterrent Learn Mode Active), P1631 (Theft Deterrent System Password Incorrect)
2001 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HE54K61
I have a constant miss on 6 cylinder idling and if you raise the rpm's it quites missing. I've changed coil pack, plugs, wires, and injector. What could it be? Trouble codes: P0300
1979 Cadillac Eldorado 5.7L ignition VIN: 6L57B9E614
engine will turn over, but does not fire until the key is released. we have found that by removing the ignition switch, it will work as designed, but go back to the same issue of not firing when the switch is reinstalled. we replaced the switch just to be safe...
2000 Cadillac DeVille 4.6L compressor VIN: 1G6KDS4Y2Y
Car came in with a/c not working. It was about a half pound low of 134a. So we top off the system. We could not find any stored codes. A/C still not working. We also noted that air will only blow thru the defrost vents. It will not change regaurdless of mode s...
1977 Chevrolet G10 Sportvan 5.7L Mechanical VIN: CGL2574148
I have to replace the Master Cylinder and I can't find out if it's a 1/2 or 3/4 ton. Does anyone know how to read this VIN?
1996 Chevrolet C1500 5.7L left and high beam indictor VIN: 1GBEC19R2T
We got the job done but found after completion we have some kind of feed or lose of ground affecting the lights and radio. The left front turn signal indicator on the dash glows with the same intensity as the high beam indicator with the key on.( has day time ...
1996 Chevrolet K2500 Cheyenne 6.5L Poor Idle Quality VIN: 1GCGK29FXT
This is the week for screwy intermittent diesel problems! The customer concern is that intermittently the truck will just idle in spite of what you do with the pedal. At other times, when he started it, it was running wide open for several starts, then went ba... Trouble codes: P0122 (TP or APP Sensor 1 Circuit short/low), P0223 (TP or APP Sensor 2 Circuit open/high), P1125 (TP/APP Sensor Circuit Problem)
1998 Chevrolet Venture 3.4L Poor Idle Quality, Stall VIN: 1GNDX03E1W
Roadtest will idle good at stop sign in gear,sometimes on decel 10-15 sec. coasting to stop will stall will re-start,and will also stall at times putting into park. No codes in comp. I.A.C counts at 100 w/key off and out. K.O.E.O. max will be 40 counts,Start u...
1998 Chevrolet K1500 Cheyenne 5.7L brakes in general VIN: 2GCEK19R7W
Customer brought vehicle in for complaint of loss of power and vibration in front end while at highway speed. Drove vehicle and quickly noticed odor of burning brakes. Found BOTH front wheels locked up. If you bleed front brks condition goes away until vehicle...
1999 Chevrolet Astro 4.3L No Start VIN: 1GNDM19W9X
Attn GM techs. Astro van came in on a hook. No start lots of crank. Fuel press, spark. injectors all ok as mentioned in repair history. Hooked up alternate fuel supply source at schrader valve, still no start. Removed spark plugs but they don't seem to be comp...
2000 Chevrolet Astro 4.3L no start VIN: 1GNEL19WXY
Customer complained of intermittant no start (no cranking?) He had installed new battery and brought the vehicle to us. It sat for a week and we had to move it several times and it always started without missing a beat. Brought it in, tested charging and start...
2002 Chevrolet Malibu 3.1L ABS Light VIN: 1G1ND52J62
I have inherited this vehicle from another tech. He has replaced the wheel brg to correct a LF wheel sensor open code. After looking the vehicle over and test in the ac signal at the sensor, I see that there is some salt and corrosion covering the HCU harness ...
2003 Chevrolet Silverado 2500 HD 6.6L heated seats VIN: 1GCHK231X3
To the GM techs out there maybe they have run into this: Driver side heated seat switch turns on for a few seconds and then goes off. passenger side switch works fine but if the driver side switch is pressed on the passenger side switch goes off. I have power ...
2003 Chevrolet Silverado 2500 HD LT 8.1L abs VIN: 1GBHK29G73
Both abs & p/b lightson dash. Checked for codes had code CO550 ECU?CCu malf. I can't find code anywhere HELP
2005 Chevrolet Malibu LS 3.5L power steering VIN: 1G1ZT54845
All right folks here we go. We have a 2005 Malibu coming into the shop in a couple of days, and its power steering intermitently does not work. The kicker is that it has electronic power steering. This is the first time we have seen this system, so any diagnos...
1994 GMC C3500 Sierra SL 7.4L Poor Idle Quality, Stall VIN: 1GDJC34N6R
this thing came to us from another shop it wont idle its had everything replaced map iac tps computer dist cap wires rotor throttle body coolant temp sensor if i put a hand vac pump on the map the vac comes up to 18-19in and it will idle it also had the intake...
2003 GMC Sierra 1500 SLE 4.8L Cuts out, Stall VIN: 2GTEK19V63
we have been haveing alot of trouble with this one I thought I had it fixed when we put the alternater on the old alt was only putting out 9 volts. the truck run good for a while then it started stalling on a regular basis and running rough still the scan tool...
1994 Pontiac Firebird Formula 5.7L No Start, Cuts out VIN: 2G2FV22POR
This Firebird came in running rough. Very rich and missing. Found coil and coil wire corrosion and plugs worn out. Replaced wires, plugs, and coil. Scan test showed the left bank O2 was dead, causing left bank LTFT to be too high. Replaced O2 sensor. Vehicle r...
2000 Saturn SL 1.9L engine VIN: 1GBZK5273Y
after the engine was rebuild the car was used as a shop car for about 6 months and 1000-1500 miles, no problems or leaks, we sold the car and with in 2 days it came back using 3 quarts of oil a day and smoking heavy, all the cylinders except #1 were dry. compr...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Park Avenue Ultra 3.8L noise VIN: 1G4CU521XX
thanks to those who offered help. i removed the pan and checked the crank and rod bearings, they looked a little worn. thrust clearence was just over specs i beleive .011. so i went ahead and relaced all bearings and noise is gone. the thump is a new noise con...
1999 Chevrolet Silverado 1500 5.3L Transfer Case VIN: 1GCEK19T4X
The customer had to use his truck. He plans to bring it back to be repaired. I will add to this post when I get it repaired. Thanks to all the members that replied.
2001 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on, loses power; fuel pr VIN: 1GCHK29111
A couple of weeks ago we asked for help with a 2001 silverado 2500 HD diesel that loses power when the temp goes below 0 deg. F. We checked fuel, was NOT gelled. We renewed the fuel filter, even though it didn't seem very dirty (wasn't new but, I've seen lots ... Trouble codes: P0093 (Fuel Sys. Large Leak Detected).
2004 Chevrolet Tahoe LS 5.3L Hydraulic Brake Booster with code B0136 VIN: 1GNEK13Z7A
Thanks to all that replied. 3 GM techs hit the nail on the head. The instrument cluster had to be reprogrammed. Other responses were the hydraulic valve in the hydraulic booster. Thanks to all that responded.
1998 GMC K2500 Sierra SL 5.7L poor power VIN: 1GTGK29ROW
Hi group, sorry for the delay, I was in Phoenix for a week working the kinks out of the golf game. The consensus seems to be that the cannister should be replaced. I haven't done so yet, but the truck is being run with the vent hose to the cannister disconnect...
1996 Pontiac Grand Am GT 2.4L clutch/hydraulic VIN: 1G2NW12T5T
First of all thanks for all info,ended up putting clutch master in it O.E. and re-bleed sys,pedal seems to return all the time, I always re-surface flywheels and never had to install shims,I did on this one and it didnt make any difference but thanks for the a...
2001 Pontiac Sunfire GT 2.4L odometer VIN: 1G2JD12T11
well as most of my responces said the problem is a bad dash. i priced out a new dash & a used dash. the problem is this is a repo car at our credit union. it will take 3 to 6 weeks for them to have a clear title & then make a choice. thanks for all the responc...
2000 Saturn SC1 1.9L timing chain VIN: 1G8ZN1288Y
Thank you all. I now have the information to make two estimates for my customer. I have shared the information you all provided to my customer to help him decide a course of action. Given the damage we know about he is leaning toward another engine. He is conc...
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