Series of problems. . .fuel related?

[Jack T.]

95 1-ton, 189K, used maybe once every 2 weeks to get feed.

Since I bought it (year or so back now) it has idled rough when warm. . .smooth when cold, but rough when warm.

Couple months ago it started having a real problem starting when warm. Start fine when cold, but not when warm.

Couple *weeks* ago it started stalling when coasting to a stop.

This morning it did that *several* times on the way to town, and the check engine light came on.

Other things that might help somebody diagnose it. . .oil pressure is always between the N and O on the gauge. Seems low to me, but I dunno. Temp never gets halfway up the gauge. Replaced the CPS a few hundred miles ago. Replaced the o-rings on the IPR shortly after replacing the CPS.

Gonna call a full-time desiel repair place today, but wanted to see if y'all had any ideas I might try before spending a bunch of money!

[jesilvas]

Oil pressure gauge is a dumb gauge. Just on/off.
Might need a thermostat if it doesn't get up to a good temp.
I was gonna say IPR since usually that causes hot issues but none cold.

[Patrick Feeley]

If you're fairly certain that the IPR o-rings are good (since recently replaced), you could have internal leaks in the HP oil system elsewhere (such as injector o-rings) where hot oil will bypass easier that colder, thicker oil. You could always run it with the valvecovers off and look for oil leaking out around the base of any of the injectors (which would indicate a failed top o-ring). If any of the ohter injector o-rings failed it would probably be using oil (so also check your main oil level). Cheers!

[nccatfan]

^^What he said. Look at your UVC harnesses to, just for kicks and giggles. My old '94 gave alot of intermittent rough running and stalling issues because of the harnesses.

[Jack T.]

Thank you, gentlemen. . .I keep a fairly close check on the oil and haven't *noticed* any drop in level.

I'll check the harness stuff. . .and check the injector orings for leaking while I've got everything torn apart.