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  1. S

    6.9 IDI endless hard starts

    I was turning it from the crank, I think the ratio is 2:1. So a full rotation from the mark on the harmonic balancer is 1/2 rotation of the cam gear. Either way I did feel a difference in the timing marks. Interesting, it ran but super low on power and died when I'd turn the steering wheel...
  2. S

    6.9 IDI endless hard starts

    Found the fix that I've been searching for. Turns out that the pump gear was TOTALLY misaligned.. much more than one or two tooth from the markers. After correctly aligning everything and bleeding the air she runs like a top. Cranks for half a second with glow plugs and below 40deg. Needs some...
  3. S

    6.9 IDI endless hard starts

    That was my thinking, but that still leaves me more questions as to whats causing my issue if thats not the source. I have not checked the timing gear alignment and maybe that is one tooth off?? I am also thinking of just advancing the injection pump more to see if there is any difference with...
  4. S

    6.9 IDI endless hard starts

    I finally got to testing it after having issues with a crappy Harbor Freight tester. Here were my results: 1: 400ish (forgot to record exact number) 2: 340 3: 420 4: 450 5: 420 6: 450 7: 400 8: 450 Some of the readings I stopped before totally maxing out the pressure just thinking that if its...
  5. S

    6.9 IDI endless hard starts

    Got around to installing it. Fuel pressure at a constant 5 PSI at inlet between fuel filter and IP. I also tried running the truck without the IP return line check valve and with the return line disconnected from the tank and into a bucket after the cross fitting at the back of the engine. Not...
  6. S

    6.9 IDI endless hard starts

    Ran the truck today with ether, even with ether it was a super hard start despite the super strong cranking! Idled with a lope till it warmed up, and as it warmed up it had more white smoke which I'm not sure what to make of it. There was also barely a trickle of fuel from the IP return line, it...
  7. S

    6.9 IDI endless hard starts

    I'll take a look this weekend. If I find that my $1100 rebuilt IP turned to junk immediately I will not be a happy camper
  8. S

    6.9 IDI endless hard starts

    So the new GPs seemed to help but I have run into another issue. On the 29th, I drove the truck again with the new GPs and found the truck still not super easy to start. Drove it slowly in my area for 10mins at a time, running time total 2hrs driving time total around 30mins. Stalled it, had...
  9. S

    6.9 IDI dies off throttle and weak at idle

    I do not use the GP controller, I bypass it with a relay which is connected directly to the battery. I've checked the ohms of each glow plug to be ~1ohm and the voltage as I turn them on with the momentary switch and I can see they get 12v. I have not checked the amperage, did you use the amp...
  10. S

    6.9 IDI dies off throttle and weak at idle

    When I bought it the truck was running but with a lot of white smoke, it was being used as a farm truck on a property for wood for about a year and before that was on the road back in 2021. I got the truck in 2024 and it was smoking lots and could not start without ether which brings us to today...
  11. S

    6.9 IDI dies off throttle and weak at idle

    I made a previous post and thought I had resolved my issue with a new set of glow plugs https://www.oilburners.net/threads/6-9-idi-endless-hard-starts.94431/#post-1157676 In order of what I've replaced/changed from newest to oldest, I have new: - Water fuel separator, GOLDENROD 496 (this past...
  12. S

    6.9 IDI dies off throttle and weak at idle

    I just tried to run it off of a fuel can and still crank no start!!! Really scratching my head as to what my issue is. New GP, new fuel, it ran just 2 days ago and now it won't even start! I'll be picking up a new fuel filter and seeing if that has any effect but not sure where else to go from...
  13. S

    6.9 IDI dies off throttle and weak at idle

    Compression seems OK but have not measured it with a gauge. I am going to try running it off of a fuel can to see if its something to do with the tank or fuel pickup and then pick up a fuel filter next week to see if that helps. Fuel is the last unknown besides everything else that I switched to...
  14. S

    6.9 IDI dies off throttle and weak at idle

    I've had it for a year, and don't know much besides the mileage and what I can tell has been modified. I've got new glow plugs, IP, injectors, return lines (~1 y/o), electric fuel pump, fuel lines, water fuel separator, fuel filter. I have a glow plug controller bypass and confirmed the...
  15. S

    6.9 IDI dies off throttle and weak at idle

    I've got a 1983 6.9 IDI F350 with the 4 speed manual. When I downshift or if I shift from a gear to neutral and let off the throttle too fast the engine will die pretty consistently. I recently got it up and running properly and just got it on the road. Some of the recent changes I think could...
  16. S

    Electric fuel pump recommendations

    I've had luck with the Facet 40285 Dura-Lift 12v Fuel Pump for my 6.9 IDI which I have seen others use for the 7.3. I used a simpson strong tie for the mount next to the battery and didn't have any issues, I mostly followed the parts in this video Its definitely an upgrade for bleeding. I'd...
  17. S

    6.9 IDI endless hard starts

    I tried to drive it today, have not driven stick in a long time. Feels under powered and stalled trying to get into second. The starter then locked up? Couldn't get it to spin until I undid the batteries and reconnected them. I was having so many issues getting it started again because the crank...
  18. S

    6.9 IDI endless hard starts

    Finally got the batteries charged and some time to bleed out the air. Turns out I didn't bleed the hard lines after swapping some fuel line out chasing the hard start issue. After some good cranking she started with no ether!! Still not a strong start but a start none the less. I let it idle...
  19. S

    6.9 IDI endless hard starts

    So maybe they were legit and crapped out? I couldn't have started the truck over the past year since I installed them with the manual glow plug control more than 100 times sadly. I was only ever able to start with glow plugs only after I installed my new IP and then after I'd say 10 starts...
  20. S

    6.9 IDI endless hard starts

    Installed the new glow plugs but forgot to charge the batteries so I could smell some exhaust but not close to starting. Will charge them up and give it a go tomorrow. All 8 of the old ones were burnt up so I'm curious if maybe how I was cycling them was causing them. I usually would count out...
  21. S

    6.9 IDI endless hard starts

    Well I was sure tricked because those did come out of a motorcraft ZD1A bag, can't trust even the reputable ebay sellers I guess
  22. S

    6.9 IDI endless hard starts

    Thanks for the info... turns out you guys were right. All of the glow plugs failed! I did the ohm check and removed the full driver side bank and all of them had over 100 kohm!!!! I kept the old ones and found 2 that were correctly around 1ohm, I hear they should be 0.8-0.3ohm but checking with...
  23. S

    6.9 IDI endless hard starts

    I did try some methods to check the GP without pulling them yet really quickly with a multimeter and the voltage from the tab to the positive was ~0.15V for one and ~0.07V for the others w the battery at 12.8V. I'll be pulling them all and sending the order for new motorcraft ones if I find any...
  24. S

    6.9 IDI endless hard starts

    I had my diesel tech buddy take a look at it running and his opinion was it seems good.. it runs fine but with a bit of white smoke but I attributed it to injection pump timing. I got the compression tester and returned it per his suggestion. I am using a new stock 6.9 filter from NAPA so not...
  25. S

    6.9 IDI endless hard starts

    Which ones do you get? I see a bunch that are listed on NAPA that are supposed to be compatible but I've heard that Motorcraft ZD-1-A is the only way to go which is why I went with those from online and I don't see any autoparts stores where I can get them

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