Guest tbirdbooboo Posted June 24, 2012 Share Posted June 24, 2012 anyone git a guide to setting the mfi metering system up. fitted a new unit but it runs lumpy . had to adjust the timing to compensate as i think its overfueling so need to tweak it. all seals are fine as are sensors etc but i think i nedd to look at mixture etc Quote Link to comment Share on other sites More sharing options...
Guest Lee81 Posted June 24, 2012 Share Posted June 24, 2012 Its massively complex to make certain adjustments but co is easily adjusted by mixture screw accessed from the pipe section on top of the mfi unit. Assuming its not turbo that is Quote Link to comment Share on other sites More sharing options...
Guest tbirdbooboo Posted June 25, 2012 Share Posted June 25, 2012 yeah got to love the mfi system lol . now that mixture screw is it the large nut with the alen key in the middle of it located at the front of the pipe system on the metering unit + got a needle with a spring in it. Quote Link to comment Share on other sites More sharing options...
Guest Lee81 Posted June 25, 2012 Share Posted June 25, 2012 No the mixture screw is inside the MFI unit. Theres a pipe around 8mm big and 30mm long that you insert a screw driver through. it adjusts the position of the air flap on the arm. You need a long screw driver. If memory serves the adjuster nut is actually an allen bolt but a small straight driver will be good enough to move it. Not sure which part of the MFI your on about but it sounds like you've be fiddling with the fuel pressure section. Thats one of the advanced adjustments that can be made but fuel will leak when you take it off and you need micro shims to set it. There extremly small so if you have taken this apart be sure that none have been lost. Lowering the number of shims will reduce fuel pressure and additional one will raise fuel pressure (Extremly important when you modify these engines so it doesn't run lean at the top end.) Incidently most cars have the spring here gone slack so fuel pressure has become lower than normal. Always worth checking fuel pressure as these cars will never run right if its wrong Quote Link to comment Share on other sites More sharing options...
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