Question about 2007 Ford F-250 Super Duty Lariat

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2003 F-250 powerstroke

It started running rough at idle yesterday and doesn't seem to have it's normal power.

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Hi djt, any updates for your concern, just to reply to aubd regarding his comment about international cannot make a HEUI engine is not true I have been a tech for international trucks for about 12 years from and a trainner for international engine for about 5years now and have seen HEUI engine from beginning production to current MAXXFORCE engine on the road and in service shop can re-assure you that with proper maintenance and proper diagnostic and repair the 6.0 liter can be pretty reliable. DJT it sounds like you might have a bad injector thats why your engine is idling rough and causing low power, first thing to check for is if engine miss or rough idle is still present cold and hot, if engine rough idle is still you do a manual cut-out test if no scanner present by disconnecting the injector harness that is connected to the injector which is located closer to the valley of the engine on topside of engine, to disconnect harness push in on metal spring lock tab and pull on injector harness upward do this one by one and try to listen for any cylinder that doesn't have a dramatic or no change in engine idle, please update as soon as possible when test is complete so we help resolve low power issue.

Posted on Sep 23, 2009

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Could be one of many things:

-Clogged fuel filter
-Leaking fuel line
-Bad fuel pump
-High or low oil level
-Overdue oil change (Will explain both these possible causes later)
-Bad high pressure oil pump, ICP sensor (injection control pressure sensor), ICR (injection control pressure regulator), or bad HEUI injectors, or oil lines
-Leak in the high pressure oil system (unlikely because you would have noticed this... This does not go undetected as the underside of your vehicle would be literally covered in oil and dripping in a very short period of time after the leak develops)
(Powerstroke engines use a HEUI fuel injection system, "Hydraulically actuated/electronically controlled unit injection", which relies on a high pressure hydraulic pump that uses engine crankcase oil and pumps it at high pressure (500 psi or so). This oil is sent to your fuel injectors to provide means for actuating them and pressurizing the fuel into the cylinders. High or low engine oil level, or old, diluted, additive depleted oil will cause this system to aerate the oil and result in poor fuel injection capabilities)

There might be other causes but this is the Powerstroke`s weak point... The HEUI system was first designed by Caterpillar, which makes a lot of excellent/bulletproof HEUI based engines, both in passenger vehicle and heavy trucks and equipment. The Powerstroke is an engine designed and made by International Truck and Engine, which cannot seem to make a HEUI engine, in any market, whether passenger, heavy truck, or equipment that does not suffer from fuel injection issues.

Posted on Aug 19, 2008


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