Engine Specific Info and Questions > mTDI Mechanical TDI Conversions
Idle
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rodpaslow:
I've read some post in this forum about mtdi idle. I'd like mine to be a bit higher right around 800-850. If I adjust the fuel screw down and adjust the idle back up it will start to hang at about the same spot every time. Is there a trick to getting it higher without it hanging?
I've also read a post about injectors. I know mine need to be changed. I get some blue smoke at startup and first minutes or so when cold (around 32°F, 0°C). Would re-newing/changing nozzles help this and the idle?
libbydiesel:
It sounds like you may be fully compressing the idle spring. You may want to stretch it a little.
rodpaslow:
Thanks. I think I may change the nozzle first. See what happens and if I still need to pull the top off and see if I can do that. I have a few other pumps, would replacing the idle spring with a stronger one do the same thing? the LR spring seemed pretty weak to me.
libbydiesel:
Yes, a stronger idle spring would accomplish the same thing. I don't recall what idle spring I used in my Rover pump. I think it was the stock rover spring. Idle is rock solid at 890 rpms. On Cummins 4BTA base pumps I always used the Cummins spring and idle is always solid.
vanbcguy:
My Rover pump definitely wants to idle right around 900 too. I have it bumped up slightly from there for vibration purposes but you can let the clutch out and it will hold about 850-875 happily.
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