just installed last weekend and it will not bring the rpms down past 18oo i have to manually go under the hood and move it back myself even with the throttle cable unhooked and manually reving the car still wont drop back down below 1800 almost like the springs isnt strong enough called holley and they said maybe throttle plates arent centerd(think thats what he said)i have seen a couple other guys with this problem besides selling the $400 pos!!!what else should i do have a couple ideas but wondering what other people have done and i dont want to add a spring thanks
eric

 

I had the exact same problem with my Holley, but it ended up being the cruise control cable. I adjusted the cable and everything has been fine since then.

Frank

 

I too had to replace the cable...it was frayed and would get hung up.

 

Check to make sure the throttle stop screw is not sticking out too far. If it won't let the blades close far enough, it will idle too high, even if you try and force the blades closed. Correct setup is:

-SLOWLY back off on idle stop screw until engine is idling at spec (800rpm for M6, 650rpm for A4 in neutral)

-check the IAC "counts" with a scanner. If not i the range of 20-40 counts, tweek screw a bit to get the counts in that range.

-check the TPS closed throttle voltage. Should be in the range of 0.20-0.90V. Some people prefer 0.65V or similar, and slot the screw holes in the TPS sensor to allow it to be adjusted.

-NOTE - many people report problems with inadequate air flow through the idle air passages, and feel you need to drill an extra hole for more air. I have the 58mm Holley, and never had that problem.

As far as not closing on its own:

-check for throttle and cruise cables being too tight

-make sure the blades are not binding in the bores (would happen if blades were off-center or too large)

-make sure the TPS sensor is correctly indexed over the flats of the throttle shaft.

-there are a couple extra holes on the side of the TB that allow the spring to be wound tighter.