I have a 1996 Ford F250 diesel power stroke. It runs fine at idle and low RPM. When you get into (not immediately) it is looses power and acts like the fuel filter is clogged, I've changed the filter keep checking the filter and it's not clogged. any suggestions?
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When it stalls out, remove both fuel filters and drain them into a measuring can. Take measuring can and see if contents fill even 1 filter. Then you will know if the filters are running dry and the engine is fuel starved. It kinda sounds like you are losing fuel draw. As RPM climbs, the draw can not keep up above idle. Could be that fuel pump is playing out. Other consideration is that problems are in high gear where RPM drops after advancing through gear range. Could be that there is a problem with the Crankshaft counter failing to Cue enough fuel for a load at Low RPM. Think that experimenting with Downshifting or disengaging Overdrive when engine bogs, may provide clue. Also check if engine has EGR, some only work in top gear, and as Diesels have Vacuum pumps, a failure could create stalling if EGR leaks.
Diesel engines are super finicky about clean fuel. Speaking of that I'm going to assume when you said "gas" you meant diesel fuel, gas is really bad for diesel engines. Is it possible someone mis-fueled it. The other thing that will make a diesel not want to start is air in the fuel, or water contamination. It is possible to draw air in with out having fuel leak out. The most common place for this is at the filter. Has there been any recent service work done? Is it possible the the cap on the fuel filter is not all the way tight or the o-ring seal is torn. Since it ran fine before and there was no catastrophic noises I am going to be looking for a fuel delivery or fuel contamination. Another posibility is are you using a biodiesel? This stuff does not like cold weather, in fact if you are somwhere where it gets really cold, regular #2 diesel will gell at sub zero temps. It could be you got some bad fuel.
it sounds like to that it is either worn/ old injectors,dirtly HPOP (high pressure oil pump) oil worn HPOP pump or dirty fuel filters or fuel. you can take truck to a qualified diesel shop and they can do a buzz test on your injectors and see if they need to be replaced with a buzz test the tester will buzz all eight injectors with engine off and you can hear the buzz of the injectors then it will go through and buzz each injectors individually in firing order to der determin witch ones are bad. the bad injectors will be alot quieter than the other and most testing equipent will show what they are running at. hope this helps.
The most common problem is a bad fuel injector but if you haven't already done so--check to make sure your oil level is all the way up to full.Power Strokes use a high pressure oil pump to operate their injectors and if your oil is at a low level it can cause air pockets in the lines going to the injectors.It's not a real common problem but I 've seen it happen maybe 10 times.Another cause is using the wrong kind of oil.Some oils have a tendency to foam at high pressures and can produce air in those same injector supply lines. Good luck!
The 7.3 power stroke is not tha bad sheesh its actually pretty simple ok let me ask some questions here ok lets start simple when cranking does the needle on the tach move to approx. 5-600 ? if not more than likely its a cam sensor in which case there is actually a recall from ford they will fix it free.... yes I said free :) if not my second guess would be the Idm they were notorious for getting moisture in them btw IDM stands for injector driver module and you can find a good reman unit online for 200 "use google" if you have a friend with a high end scanner hook up and watch engine rpm there and also do a "buzz test" no buzz = idm fail
another easy thing to do is open the drain on the fuel filter bowl and turn the key on and crank for 1 sec is there fuel shooting out ? if there isnt check fuel pump well that about covers it good luck please let us know whats up :)