FJRanger
SILVER Star
The Official 1HD-T/FT Fuel Pump Mod Tuning Thread (3 Viewers)
- Thread starter ForealBoreal
- Start date
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Steve or Ross, any updates with your mods? Impressions so far? Have you made tweeks to them?
Also, bump this to the top again!!!
Ross
I've tweeked it several times now. I reduced the fueling via the main fuel screw quite a bit, to the point that my wife complained it wasn't very fun to drive anymore. It did fine, power was just down. It was slower and didn't pull hills as well. I also rotated the star wheel clockwise another 1/4 turn to assist with the boost/power coming on quicker.
I'm fairly happy with it now. Several tanks of fuel have run through it and mileage is 20mpg-21mpg. However, regardless of what I've adjusted, I really don't feel that I was able to reduce the cold smoke much if at all. I haven't hooked a wide band O2 sensor up to it yet and probably won't.
How about you @CycloSteve? Thoughts on your current tune?
@Rock40 Im at nearly the same place as you. Had the pump rebuilt, as well as a new turbo and injectors in chase of the cold smoke. Backed the main fuel off to where it was barely drivable, but no change in idle smoke. After throwing $$$$$ at the problem, I am sending it off to a diesel mechanic who has rebuilt a couple of 1hdts. Fingers crossed he actually finds a problem and doesn't just tell me its 'normal' which seems to be the word on idle smoke around here. I can't believe these came off the lot that way. My money would be on valve seals but we'll find out soon enough.
I did quite a bit of testing in the fall with my wideband O2 setup (Innovate LM-2), and got the tune to produce plenty of power, and not a ton of black smoke or high EGT's. As you would expect, the tuning was done with a warmed up motor and with outside temps in the 50's and 60's.
However, now with winter set in (temps anywhere from teens to freezing in the AM), my morning start ups are definitely a bit smelly and hazy with unburnt fuel. Once warmed up, the truck is fine. Occasionally I dial-back the main screw another 1/8 of a turn to see if that helps, and see how much power is lost. Can't really do too much other than keep experimenting. Will likely chuck the O2 back in come springtime.
However, now with winter set in (temps anywhere from teens to freezing in the AM), my morning start ups are definitely a bit smelly and hazy with unburnt fuel. Once warmed up, the truck is fine. Occasionally I dial-back the main screw another 1/8 of a turn to see if that helps, and see how much power is lost. Can't really do too much other than keep experimenting. Will likely chuck the O2 back in come springtime.
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Well, got a Blackstone analysis back today. Looks like everything in the FT is in fine shape. I’m really leaning towards these motors just being inherently smoky. Thanks for the update @CycloSteve
Yeah, it’s a bit frustrating. I don’t know about your motor but mine is very obviously diesel smoke and not burnt oil. It doesn’t consume any oil between changes which would rule out valve stem seals. At least in my case
@Rock40 Sounds identical in every respect down to the good blackstone report. Compression is in spec and the same across the board. Definitely slobbers oil through the breather, but oil consumption is negligible. But the smoke smells of diesel and stings the eyes. Anyway not trying to turn this in to a smoke thread. I'll keep you posted on what the mechanic says, in case it gives you any insight to the problem.
I've oft wondered if part of it could be cetane numbers at work Cetane number - Wikipedia
Running a cetane boosting additive as well?
gb
Running a cetane boosting additive as well?
gb
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I believe he has brand new OEM injectors, as do I. My timing is also advanced to the upper spec limit
You guys with smokey idle, next fuel filter change, fill the new filter with Seafoam. I always find my truck is less smokey after doing this. I'm interested to hear if it works for others as well, might provide some insight into the source of the smoke.
This.
Remember guys, these engines are old technology without all those emission systems and particle traps and whatnot.
They burn diesel, they smell diesel.
mudgudgeon
Resident galah
I agree with this, but don't agree they are inherently smokey.
They definitely smell differently to a modern common rail diesel
How does one get the off boost smoke reduced to an absolute minimum? I'm with @Rock40 and @CycloSteve and @mudgudgeon about this. The smoke at idle is pretty hazy and heavy. There has to be some way to reduce it to a minimum, yes? Any ideas of fine tuning to achieve this?
chapel gate
GOLD Star
the 1hd t is notoriously smokey on cold start up. as you probable know, incomplete combustion etc etc until operating temp is reached. hence the egr set up on the 1hdft, and the air intake heater grid, which is as much to do with emissions as it is cold start assist.
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The idea is to reduce the tension on the star wheel to the point that the aneroid pin is FULLY up into the bore of the pump and not touching any portion of the fueling profile (on the pin). I'm positive mine was, and smoke was just the same. Conversely, boost was WAY too slow to come on in gears 1-3 and so I adjusted it again. My intake heater is still inop at this point. I'm not sure how long one could actually heat that element before it burns up but I'd be interested to know. The fact that the FT does not run regular glow plugs is probably my only complaint about the motor.
