Air fuel ratio Ljet Options

[Geezer914]

I am trying to adjust the air fuel ratio on me 2056 Ljet. I read the article that was posted a while back. I adjusted the wiper arm and set the idle at 1100 rpm (Raby 9550 cam) with the idle AFR at 13.2. When I check the high rpm the AFR is at 12.1. If I adjust the high rpm AFR to 13.2, (moving the large wheel 7 teeth CW) the the idle AFR is 16.9 with the mix screw all the way down. If I readjust the wiper arm to 13.2, then the high rpm AFR goes back to 12.2. Can't seem to find a happy medium. I know when you adjust the wiper arm it changes the mixture linear from idle to high rpm. How much more can I adjust the large wheel CW?

[Van B]

On last time: Does your fan have the single red paint mark or is it the D-Jet fan?

[wonkipop]

On last time: Does your fan have the single red paint mark or is it the D-Jet fan?

it might be that its a bus fan or something.
but your point is right @Van B .
should have only that one mark at 7.5 and thats the one you want.

there may assist @914werke getting that timing mark.



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question for @914werke .
do you have a decel valve hooked up to this engine?
if you do have one it could be a source for an air leak/extra air that fits the bill on the initial high idle issue.
i'd take it out of the equation and plug its hose to the air boot from aircleaner to throttle body. you can come back to the decel valve later and test it.
@Van B has all the tips for that.
just a thought - in relation to that first high idle problem you had.

as @rhodyguy notes, usually an air leak downstream means it just won't idle.
but that would be restricted to an air leak that is letting air in that is not influencing the AFM. hence my pointing to decel if its there. that will pull extra air and influence the afm and give you a high idle you can't bring down.

check your oil cap. make sure its not leaking and the gaskets are good.
and what kind of pcv valve is set up on this engine.
is it the L jet oil cap and pcv valve?

check the throttle body to plenum gasket.
i had this problem once. it was caused by a gasket that had gone hard.
and it only came up when the engine got fully warmed.
drove me nuts until i tracked it down.
car would just start to idle erratically, then stumble then die unless i gave it some boot to keep it going. really surprised me as in the end it was quite a small leak somehow around the circumference of the the t/b.