Jump to content

Adjusting flapper EFi


Recommended Posts

Don't laugh, but I'm fairly sure my 3.5 EFi is running rich <_<

I think some well-meaning soul has twiddled with the bypass on the airflow meter, I have untwiddled it by quite a number of turns but it's still not what I think it should be. Is there any procedure for twiddlage of screw or is it just twiddle-it-and-see? The Haynes Book Of Lies says to twiddle it to within a certain range of exhaust gas readings, obviously not much help if you don't have such a device to hand.

It's gonna get MegaSquirted soon enough but I'm forcing myself to leave it alone until the 109 is done, one project at a time and all that. I would weld a lambda sensor into the exhaust but then the temptation to just MS it would be too great... :rolleyes:

Link to comment
Share on other sites

Yep….. it’s a bit like adjusting a carb mixture screw, although the range is somewhat limited. You should be able to adjust it a nice stable tickover that will also coincide with max rpm on the screw adjustment (if you see what I mean).

However, if some kind soul has adjusted the spring tension incorrectly in the flapper ……… then the adjustment screw will no longer work properly :rolleyes:


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We use cookies to ensure you get the best experience. By using our website you agree to our Cookie Policy