88 250 EFI 302 run problems
Fleet Owner
Joined: Oct 2005
Posts: 20,786
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From: Kentucky
The difference between a running engine at ~35 PSI and not running at 25 PSI is not measurable with a simple squirt test from the schrader valve on the fuel rail.
There is more to the ignition system than the coil. The ICM is a well known trouble spot on this vintage truck as well as the PIP sensor in the distributor. Either one can cause intermittent problems like you describe. The ICM can be removed and tested. The PIP is a little more difficult to diagnose.
Without testing for basic fuel/spark/air when the truck does not run you are making assumptions based on what the computer thinks may be a problem at some point in time.
Kudos for checking for codes, but I think there is something basic missing here that no computer is going to flag as a problem. As smart as a modern vehicle is, never overlook the basics for combustion, i.e proper fuel, spark at the correct time and of course oxygen. One of those items in the mix is a given as long as we are still breathing, the others are the critical part of the equation.
There is more to the ignition system than the coil. The ICM is a well known trouble spot on this vintage truck as well as the PIP sensor in the distributor. Either one can cause intermittent problems like you describe. The ICM can be removed and tested. The PIP is a little more difficult to diagnose.
Without testing for basic fuel/spark/air when the truck does not run you are making assumptions based on what the computer thinks may be a problem at some point in time.
Kudos for checking for codes, but I think there is something basic missing here that no computer is going to flag as a problem. As smart as a modern vehicle is, never overlook the basics for combustion, i.e proper fuel, spark at the correct time and of course oxygen. One of those items in the mix is a given as long as we are still breathing, the others are the critical part of the equation.
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