Misfire need help - Diesel Forum

ryandude1 · 11-21-2012, 05:31 AM

I have a misfire on a t444e. The truck starts acting up after it has been warmed up and ran for a bit. It does not happen at any specific rpm or under load, it just gets progressively worse as you drive. Sometimes will even stall. I changed the fuel pump and filters, but that did not help one bit. Any suggestions?

Paul H · 11-21-2012, 09:26 AM

You may have a bad O-ring on the HPR or have a weak HPOP. When the engine warms the oil gets thinner and can sneek past a weak O-ring.

Plug into it with a diagnostic tool or laptop with software and look at the IPC pressure it may be dropping off

ryandude1 · 11-21-2012, 01:24 PM

Thanks paul. I will take a look. I will keep you posted!