95 chevy 6.5 keeps shutting off!
 

i have a 95 chevy 3500 6.5 4x4 and it will just die like you turned the key off, has a new pmd and cooler which is located on the front bumper now. it seems to only do it when it warms up. yesterday i drove it all day without it giving me one problem, and today i drove it and it started to jerk back and forth while driving like it was starving for fuel, than the check engine light went out and it goes back to normal. someday's itll do it some days it won't. i put all new engine grounds on it today thinking that was it but it wasn't. i can't find a obd-1 scanner so i used the key. and i believe this is the codes it showed after clearing the codes and driving a day. 1st was 61. than 71. than 83 than 62 than 63 than 81. i cannot find out what these codes are for. any help would be great!! :tu:

DTC 61 - Turbo Boost Sensor Circuit High
DTC 71 - Set/Coast Switch Fault (Cruise Control)
DTC 83 - Torque Converter Clutch


DTC 62 - Turbo Boost Sensor Circuit Low
DTC 63 - Accelerator Pedal Position 3 Circuit High
DTC 81 - Transmission 2-3 Shift Solenoid Circuit


Sure seems like a ground issue for the ECM.
Check the ground cluster at the rear passenger side of the intake manifold,should be (IIRC) 3 ground wires with clean secure connections.

okay, i'll try that but if that doesn't work what else could it be?:humm:

Bad ECM or bad wiring?

Mice like to camp out under the intake and around the harnesses if it has sat for a while.

could a ignition problem cause this?

Sure could,typically the dash/instrument cluster will go dark but the radio and/or blower motor will keep working when the ignition switch is at fault.
In my experience it does not throw codes when the switch is the problem-just stalling.

okay, i will check all the wiring and check ecm grounds and i will get back to you whenever i figure something out on this thing. i'm thinking it might be ignition, cause today i drove it for 30 minutes and it drove perfect, plenty of power no jerking or shutting off. i stopped and shut it off for maybe 10 minutes, got back in fired it up and drove it maybe 2 miles and it jerked like crazy than eventually shut off. :scare2: than i got to where i was going, let it sit for 2 hours and it drove it to the fuel station with a few jerking problems. put fuel in it and it drove perfect the enitre 30 minutes from to home. does this sound like ignition problem? i've noticed it doesn't do it as much if it has plenty of fuel in the tank. than starts when i get low. so idk! :argh: lol

If the problem happens with a low fuel level it might mean that you have a hole in the sending unit pickup tube in the fuel tank that lets it suck air when it is no longer covered by fuel?
How does it restart after a stall,kind of difficult?

Do you get a lot of suction when you take the fuel filler cap off?
A plugged fuel cap vent might be a problem also?

When it happens, try jiggling the switch to see if it clears. But I agree with the above post. Maybe need a new sender.

Yeah it's kind of difficult to get started again, normally about 5-7 seconds of cranking than it finally hits. Would it sucking air cause it to lose power? Cause when it loses it's power I can have it to the floor and it won't go over 50mph in 5th gear. I can pull over shut it off and 5 seconds later fire it up and have full power again. But when it shuts off it's like turning the key off than takes quite a bit of cranking to get it started. Done it today in the bank drive thru:td: