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Old 05-08-2009, 18:24   #1 (permalink)
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05 F250 Diesel idols rough sometimes won't start

My 05 F250 sometimes idols low & rough and will not rev up when pedal is pressed, and sometimes it just will not start it will just turn over and won't start unless I spray some starter fluid into the air filter. It doesn't do this all of the time, it will sometimes go a month or two without doing any of this and sometimes it will do it for a week straight. Some people told me it was the fuel pump so I changed it and it still does it. Can someone please help me, I have no idea what is causing this. Thanks
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Old 05-09-2009, 18:24   #2 (permalink)
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Re: 05 F250 Diesel idols rough sometimes won't start

Don't overuse starter fluid, the engine will get used to it, and you'll be nuked!

Just to throw some things at you: crank position sensor, throttle position sensor, idle air control valve, injector service, check fuel pressure at the RAIL, not at the pump. Diesel fuel pumps are slower than their gas counterparts. Fuel rail pressure should be rather high.
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Old 07-18-2009, 09:43   #3 (permalink)
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Re: 05 F250 Diesel idols rough sometimes won't start

My '05 just had the exact same problems. Very hard start, rough low idle, no throttle, Finally after several minutes it did start and seemed to work fine to a point.

One thing that I have been noticing over the past several weeks in an increase in turbo lag, slow acceleration from time to time and slow turbo spool up.

I would love if anyone has any ideas short of buying a whole new truck piece at a time.

Thanks,
G


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Old 07-18-2009, 10:27   #4 (permalink)
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Re: 05 F250 Diesel idols rough sometimes won't start

Best bet is to check out local salvage yards. If the turbo is on it's way out, you'll want to get it fixed before it does die, as it can come apart and kill the engine. The bearings don't last forever. If it's not already, try to get a turbo that's oil cooled. Car-Part.com--Used Auto Parts Market is a good parts finding site. Be sure too, that the fuel filter/water separator isn't plugged. All it takes is one bad tank of fuel to clog it up.
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