Compression Ignition Addict
Join Date: Oct 2011
Location: Tehachapi, CA
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One of the more common "no start when warm" problems is from bad Injection Pressure Regulator (IPR) o-rings. The cold, thick oil will allow enough pressure to build with bad o-rings, where the warm, thinner oil will bypass the o-rings and no allow pressure to build high enough to start. Replacing the o-rings is a good first try since it doesn't cost much for parts.
IPR O-Ring Kit (for when IPR valve replacement is not required)
1997 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, External Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed
SOLD - 1994 F350 CC DRW 2WD PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, DPPI DP, Bilsteins, $12 AIC, Coolant Filter, Explorer Overhead Console, A-Pillar w/ISSPRO Black Ice, EV Boost, and EV Pyro, Modified Pedestal, Gutted EBPV.