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    Failing fan clutch?

    Mine went out- it did that, temps run up and down. When I checked it cold, it turned easily. I cranked the engine let it warm up, shut it off and rechecked- a bit stiffer but still easy to turn. Put on the new one- man..it's LOTS stiffer even when cold. That was my problem.
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    91 F250 7.3L IDI miss- cannot figure it out

    Seriously - you'd think a cracked line would be obvious- but it wasn't! Couldn't believe it. Thanks Thewespaul- for keeping me grounded.. :) Cheers mate.
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    91 F250 7.3L IDI miss- cannot figure it out

    Ok everyone- truck is fixed. Turns out- I had a cracked fuel line. Couldn't believe it. #1 line developed a severe leak- I thought I had damaged the face, so I resurfaced the "cone"... if you take your time, this works, the face is pretty malleable and will, upon compression, re-develop a...
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    91 F250 7.3L IDI miss- cannot figure it out

    Don't know where you got MISS-FIRE from. It's a MISS, as in cold cylinder. Pretty sure you cannot "time" a difference between the pump outputs, as these are all milled metal parts. Not adjustable- insofar as I can tell. Thanks anyways.
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    91 F250 7.3L IDI miss- cannot figure it out

    Ok- so here's what I did. I ordered a spare #7 & #8 fuel line. I removed #1 fuel line from IP (problem cyl) and found that the #8 worked perfectly as a test line, came up above the engine where I re-installed a spare injector (that I already tested opening at 1800, the fuel return cap and with...
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    91 F250 7.3L IDI miss- cannot figure it out

    Ok, so back at square 1, I've ordered a couple extra injector lines, gonna pull #1 and use the extra line as a test line, put an injector on it and see if it pops it and flows. That will at least verify fuel delivery, and positively test the IP output for that cylinder.
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    91 F250 7.3L IDI miss- cannot figure it out

    Is there any way- that the little pick up unit on #1 for the clamp used to set the timing could be causing this? It's an odd little piece, only on cylinder 1. You can blow through it, but if there was some kind of bladder or expansion chamber in it that could defeat the IP pulse... hell I'm...
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    91 F250 7.3L IDI miss- cannot figure it out

    Injectors and IP bought from Pensacola Diesel. I'm considering that as a very low possibility, because the basic symptom did not change after these parts were installed. #1 cylinder not firing. Ha- can't positively rule em out, don't have a way to test the IP cylinder one shot. But #1...
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    Engine rattle and white smoke

    Stupid question but gotta ask- has anyone been messing around with the IP timing/mounting bolts? What you are saying sure looks like a slip in timing and a suddenly retarded engine.
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    91 F250 7.3L IDI miss- cannot figure it out

    Pulled valve cover. Cyl#1 is my issue-found absolutely nothing wrong. Springs good, pushrods look and feel good, rotated engine, intake and exhaust rocker arms seem to move completely through their cycles- that's relieving- that at least suggests the cam shaft may be ok. So- I'm back at...
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    91 F250 7.3L IDI miss- cannot figure it out

    Passenger side valve cover- looks like a bear...or maybe it'll come out without removing the fuel filter housing?
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    91 F250 7.3L IDI miss- cannot figure it out

    Over the course of a week the truck developed a miss, injectors tested 1800-1900, except (2), one was 1400, one was 2400 (wtf?) lol. So- I replaced the injectors. No change. Cracked fuel lines, discovered (as you face the engine) front left cylinder was the miss. Given (1) the fuel spurt...

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