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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 16, 2006
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Open Help Requests for GM
Help Request Answers
1990 Buick Electra Limited 3.8L MIL Lamp on VIN: 1G4CW51C7L
This vehicle came in with mil lamp on. Checked for codes had a code 41 cam sensor circuit. Went through diagnostic chart KOEO using DVM to check voltage at cam sensor connector pins A-B and B-C should be 8 to 10 volts. Pins A-B has 5.10 volts and pins B-C has ... Trouble codes: 41 (cam sensor circuit)
1994 Cadillac DeVille Concours 4.6L spec's VIN: 1G6KF52YXR
I just got this. Verry clean, a good car for wife...I thought. Lots of oil leaking while running. I'll get it up in the air and P.wash, and recheck.(Hope not a head gasket)!!! The main thing I wanted to know, what's the differince between the "9" and "Y" engin...
2000 Cadillac Seville SLS 4.6L Starter VIN: 1G6KS54Y4Y
Came in on the hook, I have a signal to the PCM for crank request but PCM does not ground the starter relay. Replaced and programmed the PCM and relearned the VTD. Still no crank signal to relay. No codes stored in PCM or DIM. I can ground pin 44 at the PCM an...
2000 Cadillac DeVille 4.6L Misfire, MIL Lamp on VIN: 1G6KD54Y8Y
This Deville originally came to me because there were a number of diplays not showing on the dash and the Service Engine light was on. All of the problems started after the owner installed a new battery. He said he replaced the battery because the positive pos... Trouble codes: P0300
2004 Cadillac CTS 3.6L Shift Interlock,Key solenoid VIN: 1G6DM57784
Hello Iatn members, I've got a tough one here.This caddy has an issue with the shift interlock and key lock solenoid not working. Also the fuel and temp gauges are inop. With the Tech 2 I am able to activate both solenoids. I am also able to communicate ok wi...
1992 Chevrolet C3500 Cheyenne 6.5L won't shut off VIN: 1GBKC34F7N
This came in with bad radiator seam. Replaced rad. thermostat, and refilled. Customer asked me to also replace fuel filter. I was careful in the replacement knowing how a small amount of debris can cause injector problems. I Noticed extended cranking when tryi...
1995 Chevrolet Corsica 2.2L crank sensor VIN: 1G1LD5540S
attempting removal of crank sensor.what is left is the hollow brass shell.hex is worn,stub is too short for twist socket, extractor is spinning inside.oh how i love mondays.any suggestions? will i be able to gain access to it from inside, driving it out? thank...
1996 Chevrolet Blazer 4.3L Oil Contamination VIN: 1GNCS13W2T
We replace engine 6 months ago, and now customer came back with oil contamination. No overheating problems, no external leaks. I drained the oil and pressure tested the cooling system and coolant leaks out of the oil drain plug. I left the oil drained and plug...
1999 Chevrolet Cavalier Z24 2.4L suspension VIN: 1G1JF12T6X
hello, any help on this one would be greatly appreciated. Car has vibration under light and hard acceleration. You can feel the vibration in steering wheel and foot pedals. This vehicle has been lowered, not if that has anything to do with it??? All suspension...
2000 Chevrolet Impala 3.4L Cuts out, Misfire, MIL Lamp on VIN: 2G1WF52E6Y
this is a real hair puller. vehicle came in with complaint of no power and no overdrive. we found that the od was working ok, but at the rpm mentioned. it would start to misfire. it had several codes, but the only ones we could reproduce on a regular basis wer... Trouble codes: P0300 (multiple cylinder misfire), P0304 (cyl 4 misfire)
1995 GMC K2500 Sierra SL 6.5L Stall VIN: 2GTFK29S5S
Hello, I need some help on this one. This truck has come to me due to a start run stall problem. There are no codes in the computer, but I don't trust the computer since the data will not change as it should ( example: The truck is ideling at 650 R.P.M. and yo...
2000 GMC C3500 Sierra SL 7.4L long crank time VIN: 1GDKC34J2Y
very long crank first start of the day and long crank time on hot soak restart Trouble codes: P0339
2000 GMC Jimmy Diamond Edition 4.3L Poor Idle Quality, Misfire VIN: 1GKDT13W7Y
Hello everyone, Customer brought this truck in with a complaint of a rough idle. First start in the morning didn't seem to idle that rough. The more the vehicle ran the rougher the idle got. Put the scanner on the vehicle and found out it has a dead miss at id... Trouble codes: P0303 (Cylinder Misfire 3)
1999 Oldsmobile Cutlass GL 3.1L Misfire VIN: 1G3NB52JDX
Good morning everyone, Our problem child of the morning is this 1999 Olds Cutlass, 3.1 J engine. The vehicle has a dead misfire on #6 cylinder at idle. Bring engine up to about 1200 RPM and it picks up the cylinder. Engine compression is 150 psi across all cyl... Trouble codes: P0306 (misfire 6 cylinder)
2000 Oldsmobile Alero GL 2.4L Stall VIN: 1G3NL12T6Y
Today, I went to the vehicle and it started normally. Battery voltage is normal. The little girl who drives this vehicle can not manhandle the steering when the engine shuts off. And is in a screaming panic as she must only glide off the road to a stop where ... Trouble codes: U, 1000 (Crankshaft Position Sensor)
2003 Oldsmobile Alero GL 2.2L No Start, Stall VIN: 1G3NL52F03
Good Morning everyone, What a way to start on a Monday. This vehicle was towed in with the thought that it was out of gas. Upon initial checkout the vehicle will start and run for about 3 seconds and die. It will crank but will not even try to start. If vehicl...
2000 Pontiac Grand Prix GTP 3.8L Stall VIN: 1G2WR5218Y
I work as a drivability tech at Ford dealer. This car belongs to a friend that wants me to take a look. He is willing to pay to have components replaced as an educated guess to keep them from getting stranded. I took it to our local Chev dealer to be scanned w...
1998 Saturn SL2 1.9L Cuts out, Stall, MIL Lamp on VIN: 1G8ZK5274W
this saturn has a "tip-in" stumble and sometimes stall only and immediately after the engine coolant reaches 133 degrees f. any time the throttle is slowly depressed after this temp is reached, whether in gear or not, it will consistantly stumble just off of t... Trouble codes: P1599 (powertrain stall), P0744 (tcc circuit intermittant)

Fixes & Summaries for GM
Fix/Summary Answers
1988 Buick Skyhawk Custom 2.0L headlights VIN: 1GCDT14Z7R
Thanks for all the great help, now i just need to locate a replacement or the replacement gears. A very hard item to find!!
1999 Cadillac DeVille d'Elegance 4.6L MIL Lamp on VIN: 1G6KE54Y0X
After sleepless nights and endless days, come to find out it is a torque convertor problem. Problem was when convertor would malfunction it would not set a trouble code for torque convertor malfunction. It would continually show MAF P0101 after freeze framing ... Trouble codes: P0101 (Mass Air Flow).
2003 Cadillac CTS 3.2L Ignition Switch & Gear Select VIN: 1G6DM57N83
hi all, sorry for the long wait. The vehicle is fixed and has left the shop a few weeks ago. What i had to do was have a friend of mine with a tech2 come over and assist. What we found was the rear intergration module was recieving info but nothing was coming ...
1978 Chevrolet mercruiser 180CID Poor Fuel Economy
Thanx for all the help. I used the level the float with the gasket surface method and things worked out OK. I must say that the local Mercruiser dealer was not helpful. Most of the available tech manuals did not get specific with details. Automotive guys and m...
1996 Chevrolet Blazer 4.3L shifting all gears
I'm going to close this request because The customer elected to have the dealer do the repair. They confirmed that the wiring harness was bad. As a last resort a friend at the dealer installed and programed a VCM with no change. I had eleven responses, every a...
1997 Chevrolet K1500 Cheyenne 5.7L Misfire, MIL Lamp on VIN: 2GCEK19R2V
Sorry it took me so long to post a fix but I wanted to make sure that we had this truck fixed. Most of the posts told me to look for a leaking headgasket or injector, or for a bad ground. We had already checked and ruled out any thing along this line. Bruce [...]... Trouble codes: P0151 (O2 low), P0154 (Low O2 Activity), P1153 (Insufficient O2 Switching).
2000 Chevrolet Suburban 1500 LT 5.3L hard starting VIN: 3GNFK16T6Y
Hello fellow techs, After several hours of working this vehicle, I found that the injectors were leaking after hot soaking. I pulled the injectors after the engine was hot and pressured the systems. After setting for 20 mins the injectors started leaking. I ...
2001 Chevrolet Silverado 2500 6.0L Poor Idle Quality, Misfire VIN: 1GCHK24U11
Most of the people who replied mentioned checking the fuel pressure regulator (this was not leaking). I was unable to determine the cause of the random missfire at idle. I did replace the worn plugs and shorted plugwires, and this addressed the customer's comp... Trouble codes: P0300 (random misfire detected).
2001 Chevrolet Cavalier 2.2L No Start, Stall VIN: 1G1JC52451
I tried to capture the output from the ignition switch with no luck, as it quit dying. However, knowing the problems with this, and since a tie strap was wrapped around the switch, I replaced it, shipped the car and all seems well to date. Trouble codes: U1000.
2003 Chevrolet Silverado 1500 HD LS 6.0L Hesitation, Cuts out, MIL Lamp on VIN: 1GCGK13U03
removed and cleaned 4 ground connections, 2 under the drivers side cab and one on each cylinder head, backside by the bell housing. truck has been driven 2 weeks and no problems have returned. thanks to all helped. Trouble codes: P1516.
1996 Geo Metro 1.3L 1-2 shift VIN: 2C1MR299T6
Hello again, this vehicle is fixed and has left the shop. The problem was the shift solenoid. The electrical system in this tranny will test good although the shift solenoid is bad. this is a single wire solenoid which grounds through the body of the solenoid....
1999 Pontiac Grand Prix GTP 3.8L Oil Consumption VIN: 1G2WR121XX
Thank you to all who replied, 18 in all. We replaced the intake gaskets and PCV valve, spring and gasket with no improvement. After engine disassembly the problem was quite obvious. Number 6 piston was cracked at ring land. Machine work to be completed this we...
2000 Pontiac Grand Am SE 2.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G2NF52T8Y
As most people said it was the coil housing. Always check this one first before looking at the coils or module. Appreciate all the help...
2001 Pontiac Montana 3.4L Hesitation, Cuts out VIN: 1GMDX03EX1
Looks like Robert from Maryland hit it on the head. We inspected the whole wiring harness and were finally able to see the crank sensor wires routed too close to the EGR tube, burning through the plastic conduit and shorting out. It looks like the intake has b...
2002 Pontiac Firebird Formula 5.7L No Start VIN: 2G2FV22G22
Hello guys thanks to all who responded. I did get to momentarily check vehicle while it would not start and was able to determine that I had signal to starter solenoid from ignition switch, I replaced the starter and released to the customer so far so good. i ...
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