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  1. Q

    IDM questions / buzz test code

    Quick background, there's too much to say, but... I can tell by feel there's a slight miss, and cct fails on 4 and 8. I replaced LOTS of things so far for various reasons, incl. rebuilt inkectors. Just for kicks I tried putting in a spare supposedly good rebuilt IDM that a mechanic had left...
  2. Q

    Running compression test... How to

    Starting a new thread because this isn't just about my problem... Question: after watching DieseltechRon's video, I want to do a running compression test, I just want to confirm the process before I blow something up. So I'd pull just the glowplug on the cylinder I'm testing and unplug the...
  3. Q

    7.3 slight miss, knock, but compression and injectors seem OK... What could it be?

    99.5 F550 7.3 Powerstroke 4x4 ZF6 Makes a knock when driving that has a metallic ring to it. Sometimes it's barely there in the diesel noise, occasionally it's so loud that nobody can miss it. Computer is reporting cylinder contribution failure on #4 and #8. However, I swapped them with #2 and...
  4. Q

    Tail light /trailer-tow/chassis wiring harness questions

    Happy holidays, folks... I'm restoring a '99.5 F550 7.3 Powerstroke 4x4 165" chassis cab I'm to the point where I have about 12 or so wires going to the rear, I'm wondering if any one can tell me what they're supposed to be? Some do nothing so far but may be trailer/tow wires that aren't hooked...
  5. Q

    F550 GVWR question

    Does anyone know what the difference exactly is between an F550 with 17500 gvw and an f550 with 19000. Just wondering if it's something I can upgrade. Thanks in advance If there is a better place for me to post this question, please let me know. Sent from my Nexus 5X using Tapatalk
  6. Q

    Android app? / real diagnostics? / mechanical temp gauge?

    I have an early 1995 F350 7.3 DIT I can feel and hear a miss, though it runs pretty well and it's been this way since I got it a year ago. Now that it's getting chilly at night, the truck starts a little hard and smokes when it starts up, so I'd like to give it a little love -- Hopefully...
  7. Q

    Coolant Flush: How to re-fill w/Distilled H2O?

    So I've been reading a lot about cooling system stuff while searching out my radiator, and now waiting for it to come... It sounds like a good idea to flush and use distilled water to mix with antifreeze/coolant. On my '95 F350 Powerstroke I have the old style cooling system with cap on...
  8. Q

    Help finding correct radiator for early Powerstroke - pretty please

    So the question, first: how do I find the right radiator, and do you know of any that are better than others. I just bought a '95 F350 Powerstroke and after a few days in NY the coolant froze... that new coolant he put in wasn't antifreeze enough... My shop checked it over and says I got...
  9. Q

    Glow Plug relay diagnosis -- and how the system works -- '94 7.3 Turbo IDI

    Hey guys, I have a 7.3 Turbo IDI, and I'm just looking for some clarification on the glow plug system and whether I need a new relay. My problem is sometimes the glow plugs aren't running when they should, even though the WTS light is on and power is going to the relay. I can tell because if...
  10. Q

    Should I install a fuel check valve between electric pump and filter?

    Just got a '94 f350 7.3L turbo IDI. Before I bought it, the mechanical lift pump was abandoned and an electric pump added back near the tank. I'm having an air intrusion problem: turn the key and it starts for a second or two easily, but then dies and takes a lot of cranking to get going...

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