Folks,
I am having problems with this 300, it will sometimes start, run for a short while then quit. I put a meter on the PIP and when it runs I see 6-8 volts. when it quits the voltage drops to 1.3. we have replaced the distributor, coil, ECM, crankshaft position sensor, and had computer sent off for testing. I have not been able to figure out what is causing the issue. Any ideas on how to fix this issue

 

Welcome to FTE

I should know this but what is PIP?
Is that the pick up coil in the dist.?
I am guessing you loose spark?
Do you have voltage on the + side of the coil when running and when it stops running?
what happens to the voltage on the - side of the coil when running?
When it stops running and you crank the motor what happens?

The other thing you can do it is post this question up in the 95 truck area above as you should get more people seeing it.
Dave ----

 

(PIP is from the sensor in the distributor)
That's not a useful test - it's like saying that the tach drops to zero when the engine isn't running.
The test that would have been useful before the PCM's contents were disturbed by disconnecting KA power (when it was removed to be sent off) would have been to read out any stored fault codes. It will still be useful now, but cutting KA power may have forever lost some transient data gathered as the problem(s) was developing and yet before it fully set in.

Pre-EFI, the fuel, ignition, and mechanical plants were largely independent systems and so could be checked independently.
That's not remotely the case when a computer is running the engine - it's literally in charge, and so it must be consulted when the engine won't run. Not just consulted eventually, but consulted pretty nearly first in the process.

 

Ok then it is the pick up in the dist. as I thought.
I know with the DSII system you can check it using a meter but ohms not volts.
So if you can find the spec should be able to check it.

I am also with you that if there is a computer running the show to check it as it can help point you where the issue is.
But once you find that there has to be a way to check that part to a spec to see if it is with in the factory spec.
If the computer has codes for say TPS, O2 or EGR to name some, there has to be a spec so you can test to see if the part is bad or bad wiring.
Dave ----