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96 timing issue possibly

if you disconnect the optic sensor and leave the CPS plugged in and it doesn't start that would lead to a bad CPS sensor, but if you disco the CPS and leave the optic connected and no start, that is a bad optic.

basically the engine will run without one or the other but not both. it will take longer cranking to get it started though.

based on what you said..
chevyCowboy said:
it starts the same whether the CPS is plugged in or unplugged
Click to expand...
This says the CPS is bad or the wires to it are damaged. look at the sensor (on the drivers side bottom of the timing cover) and see if there is any oil seepage in this area. clean well with some brake cleaner. the wires will run from the CPS up the front of the block where the connector is right near the front drivers side valve cover.

also, is this on your 95 or 2000 rig? if it's the 95, look and see if you still have the noise filter connected inline on the optic sensor, if so, remove it and connect the optic connector direct to the IP. that noise filter causes more grief than it's worth.
 
dbrannon79 said:
if you disconnect the optic sensor and leave the CPS plugged in and it doesn't start that would lead to a bad CPS sensor, but if you disco the CPS and leave the optic connected and no start, that is a bad optic.

basically the engine will run without one or the other but not both. it will take longer cranking to get it started though.

based on what you said..

This says the CPS is bad or the wires to it are damaged. look at the sensor (on the drivers side bottom of the timing cover) and see if there is any oil seepage in this area. clean well with some brake cleaner. the wires will run from the CPS up the front of the block where the connector is right near the front drivers side valve cover.

also, is this on your 95 or 2000 rig? if it's the 95, look and see if you still have the noise filter connected inline on the optic sensor, if so, remove it and connect the optic connector direct to the IP. that noise filter causes more grief than it's worth.
Click to expand...
it's the 96 and I think it is still there. I had replaced the cps with a known good one not to long back and still had some issues intermittently so I'm thinking it's a wiring issue. going to dig in deeper tomorrow
 
figured I would give an update on this since I seem to have fixed the problem. I had replaced the CPS and then was still having issues after a while and intermittently, I then thought maybe it was the engine harness so I replaced the harness under the intake. that also fixed it for a little while and then it came back. I looked over all of the different connectors and plugs and couldn't find any wiring issues. The issue got so bad that I could barely even drive the truck and it would kick itself out of time after talking with @Glagulator I checked into the connectors at the PCM and cleaned them all and made sure they were nice and tight. I did find a couple that were loose and a couple of the wedges for the back of the connector were broken so I replaced those and the ones I had from a parts harness and I have not had an issue since.
 
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