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Originally Posted by mstangv8302
ok thanks,
I did get my intake running correctly and found out that it was my fuel filter that was clogged It ran much better after replacing it with a free flow. But its been about a week and its starting to lose power in the high rpm's again and after doing some reaserch i realized that my short runners are possibly not functionaing after I have been driving for a while, do you think the selenoid is malfunctionaing after its been running for a while? I do not know where the short and long runners are but right around 4000rpm i notice it never gets that extra boost we all know and love. any ideas where to get one also?
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The long and short runners are inside the (UIM) upper intake manifold. If you take off the UIM, youll notice a primary and secondary port. You probably already know this. The length of the plenum of the LIM (lower intake manifold) are the same length, except the secondary ports have butterfly valves which open at 3750 RPMS.
If you open the hood and rev the engine from the throttle body, youll see the linkage connected to the lower intake manifold (right below the throttle body) move to open the butterfly valves. If the linkage moves, youve got another problem (I would guess fuel pump). If it doesnt move, you can either buy a new IMRC (Intake Manifold Runner Control) from the dealership or a used one from the cougar or contour message forum classifieds.