FridgeFreezer Posted August 7, 2006 Share Posted August 7, 2006 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... Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted August 7, 2006 Share Posted August 7, 2006 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 Ian Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted August 7, 2006 Share Posted August 7, 2006 as it will be out of range of the fine tune of the twiddle screw Ask me how I know this if thats the case its prise the black top of the AFM and adjust the black wheel which is in simple terms a coarse adjustment, then back to the twiddle knobby Nige Quote Link to comment Share on other sites More sharing options...
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