Question about 2005 Ford E-Series
Truck starts fine when cold. When warm sometimes will, sometimes won't start. Dealer has not been able to diagnose. Replaced both fuel filters and a noisy fuel pump. The entire three days the dealer had the truck it started fine cold, warm and hot. Hoping to avoid taking the top of the engine off to check the o-rings. Dealer said leaky o-ring can prevent necessary oil pressure needed to fire injectors. Could it possibly be the coil? - Todd in Massachusetts
These International engines can be difficult to diagnose without the proper tools; namely Ford's I.D.S., or Navistar's DLC.
As for the o-ring the dealer was hinting at, they may have meant the o-ring on the fuel injection pressure regulator. I have witnessed these leak and cause difficult or no starting. This component is located at the rear of the engine below the turbo exhaust supply tubes. A specialty socket is needed to replace it (35mm 12 point socket which resembles an O2 sensor socket), although replacement is most likely unnecessary considering that your vehicle does eventually start. If this were indeed the culprit, your engine would not start. There is a test port next to this regulator to test oil pressure (bolt with allen head relief). A high pressure gauge which reads greater than 5,000 psi is necessary to test at this port. When your engine doesn't start, try checking what the oil pressure is at this port. A minimum of 3,000 psi is needed for the engine to start and 5,000 psi is prefered
Other sources of this problem could be the intake air temperature sensor, oil temperature sensor, or wiring compromises. It's a shame the dealer didn't want to spend the time necessary to pinpoint your problem. So glad I'm out of that crooked industry.
Posted on Dec 01, 2009
Get the engine timing checked. I'm not sure about your car but some of the newer car's have timing advance this advances the timing when the engine is hot.With older engine's if the battery was low a trick to start was retire the timing a little to leave the engine easily started when cold but had had to be advanced again because this left it very hard to start warm. Newer models like your's have a timing advance built in. I can't say for sure this is the problem or if yours has timing advance but your dealer should know. If it has.nt got timing advance I think it is still worth a check. Hope this help's. Cheer's
Posted on Sep 10, 2009
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Posted on Jan 02, 2017
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