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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 28, 2005
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Open Help Requests for GM
Help Request Answers
1992 Buick Park Avenue 3.8L No Start VIN: 1G4CW53L4N
When this car does not start running after cranking you can always remove number 1 plug wire and it will start running. Then switch it off and replace wire and it will run again. And never stall. Then may start lots of times before failing to start again. And ...
1998 Buick LeSabre Custom 3.8L block VIN: 1G4HP52K7W
hi guys i have a noisey 3800. frequency like a valve..very light when cold, more pronounced after long drive on highway.. does balance shaft get noisey on these?? never had a noisey 3800 before, don't want to tear down without some heads up first. thanks!! dav...
1970 Cadillac De Ville 472CID Alt Light
The alternator light on this vehicle doesn't work properly. With the key on and the 2 wire plug at the alternator unplugged the alt light in ON.With key on and alt plugged in the light is OFF. I see in an older Mitchell wiring diagram that there is a wire from...
1995 Cadillac DeVille 4.9L Hesitation, Cuts out VIN: 1G6KD52B4S
I'm glad I've shaved my head. This will be the second time trying to pull it out.. This Deville will drop 4 injectors about 2000 rpm in gear, forward or reverse. I have ohmed the injectors all have 15 resistance. With the key on all have the same voltage comi...
1999 Cadillac Catera 3.0L No Start VIN: W06VR52R2X
Car is a no start. No MIL on at first. Pulled cluster found bulb burnt-replaced bulb-still no check engine when key turned on. Tried accessing other modules in car was able to access anything but the ECM. Check for battery and ign power to ECM it has both. Che...
1994 Chevrolet S10 Blazer Tahoe 4.3L pcv VIN: 1GNCS13W7R
We replaced the intake gasket and sent the customer on his way. A few days and only 60 miles later he has back complaining of intermitant smoking and going thru 1.5 quarts of oil. We pulled the upper plenium and found it with a massive a massive amount of oil ...
1994 Chevrolet Astro CL 4.3L suspension VIN: 1GNDM19Z3R
I have a 94 Astro Van that has a vibration over 63 mph ... and gets worse as speed increases ... nothing we have done has seemed to touch this vibration ... the angle of the drive shaft appears to be ok ... nothing drastic ... the vobration seems to lessen if ...
1999 Chevrolet K1500 Suburban 5.7L valve body VIN: 1GNFK16RXX
Sorry, Guys. This is my car and I'm far from the shop on my days off with no reference materials. I need to know the torque spec for the 4L60E valve body bolts. I appreciate the help.
1999 Chevrolet S10 LS 4.3L No Start, Stall VIN: 1GCCS19X8X
Techs, Have another start and then stall, Cannot communicate with vehicle at all to retrieve any possible codes checked DLC for both grounds and B+, with key in the on position I have 8v at #2 pin serial data line and 5v at pin #9 serial data Uart line, The se...
2002 Chevrolet Impala LS 3.8L No Start, Poor Idle Quality, Stall VIN: 2G1WH55K92
I have another hair puller. Cust. complained of no start unless he moved the throttle. He was right. Have no codes, Have 55lbs of fuel pressure Ohmed the injectors,all have 13.3.Have spark and injector pulse.Crank it over with no throttle it will never start, ...
2004 Chevrolet Silverado 1500 4.3L mode actuator VIN: 1GCEC19X64
truck came in with the mode control on the ac not working,stays on defrost,it started to work so i replaced the mode actator motor.Now the motor doesnt work,Is there a common -problem with these trucks?Im thinking it might be the hvac module or the control hea...
1997 GMC Jimmy SL 4.3L transfer case VIN: 1GKDT13W5V
the vehicle will not disengage 4wd. the transfer case is making a type of bearing noise while driving in 4wd. the noise is not there if you remove either driveshaft. if you run the vehicle on the rack and shift to 4wd on the fly it engages and to 2wd, come to ...
1999 GMC C1500 Suburban 5.7L No Start, Starts then dies VIN: 3GKEC16R8X
Suburban intermitantly fails to run after startup. diagnostic flow led me to pcm is'nt firing the injectors. ignition system is fine during problem. fuel pressure is within specs also. p1626 passlock code sets when problem occurs.I traced the wiring all seems ... Trouble codes: P1626
2002 GMC Yukon Denali 6.0L Ride control VIN: 1GKEK63U42
Help! We have a 2002 Denali with the "Service Ride Control" lamp illuminated. We have checked the resistance of the shock itself at 2.2 ohms which is good if Alldata ii correct in saying that each shock should be between 1.5 and 3.3 ohms. So with that checking...
2001 Pontiac Sunfire SE 2.2L No Start VIN: 3G2JB12461
This thing is starting to hont me . It come in via tow truck with a no start . Sat there for a couple of days until we got a chance to look at it .When we finelly got a chance to look at it it started right up . Customer couldn't trust it so she left it with u...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Chevrolet Camaro Z28 5.7L Miss/Backfire VIN: 2G1FP22P7R
Hello everyone and thanks a ton for the input on this one. I recieved replies about plug wires, mass airflow sensors, EGR valves etc. This one ended up being bad plug wires. They had been replaced within the last year by another shop with non delco wires. I wa...
1994 Chevrolet S10 Blazer Tahoe 4.3L Hesitation VIN: 1GNDT13W3R
thanks to all that responded,been there/done that of most sugestions,rechecked TSBs,warranty was 100,000 miles california only.as of last friday blazer has not been back,currently running properly.recommended to cusyomer to try some chevron techron inj cleaner...
1997 Chevrolet Blazer 4.3L ignition key VIN: 1GNDT13W8V
First of all, thank you to all that took the time to reply. It appears that this whole system is missed by anyone that puts out diagnostic information as I still have not been able to get a wiring diagram that shows this solenoid. I received several replies ta...
1999 Chevrolet Cavalier LS 2.2L Starting VIN: 1G1JF5242X
thanks to those who replied. we found the problem to be the wire on the connecter 'c' pin 74 on the pcm. the customer just happened to remember that they had some electrical work done before and what i had found was the wire had been pierced causing a intermet...
1999 Chevrolet Lumina 3.1L Hesitation, Surge, MIL Lamp on VIN: 2G1WL52MXX
this one is finaly fixed, we found broken wire in the loom by the reciver dryer that was rubbed thru the a/c line. one of those wires was for the 24x signal. what i did to narrow it down was drove the car with 24x senser wire disconnected and the car drove fin... Trouble codes: P0336 (24X reference signal).
2001 Chevrolet Silverado 2500 HD 6.6L no acceleration VIN: 1GCHK23181
This truck has not had a problem since last in. The customer also took the vehicle to the dealer and they could not find a problem either. The posts I recieved pointed to the fuel regulator but the customer has decided to wait till a later date for repair. Trouble codes: 93 (Fuel pressure lower than commanded value).
1991 Geo Prizm 1.6L MIL Lamp on VIN: 1Y1SL3450M
well this car still is not fixed. i was hoping someone out there may have come accross this witht he same car. i am finding out that there is not alot of these cars out there. I did install a new o2 sensor. still no good. i feel i have to say something about o... Trouble codes: 21 (02 sensor short or open circuit).
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