Corrected accel lag when hammered

[BigMikeIT]

I think a figured it out. I couldn't locate the original thread of mine, however I believe the lurching lag problem when hammering the accel pedal is resolved.

Back when swapped my exhaust from the original Y-pipe to a mustang H-pipe with the dual CB glasspacks, I found the idle speed when just starting the engine was too slow and the thing would die with put into D (and even worse with the lights on).

My solution was to turn the idle-air screw keeping the throttle higher to compensate. Doing so threw off the Idle Air Control. I have a feeling the car was compensating, fighting the TV cable and my foot, which would cause the 1/2 second surge on the pedal acceleration.

It popped into my noggin at 9pm tonight, having a flashback to seeing the fan cowl label emissions label (idle air control, rpm must be between something like 450-650, this can't be changed).

And here I was thinking a lobe was worn or the timing chain loose.

Unfortunately, the car doesn't accel as good when I had it idling probably at 650-800+. I guess I got used to having that trigger pedal.

[83countrysquire]

how many turns should this idle screw be at?

[gadget73]

its supposed to be turned in just enough that the throttle plate doesn't shut quite all the way, and thats about it. If its been screwed with, unplug the IAC and turn the screw in just enough that it will idle around 400 rpm or so. It just needs to be turned in far enough that the blades don't fully shut, but not so far that its above the computer's target idle range. The IAC should not be fully shut or you get wierd codes and other running problems.

Target idle RPM is I believe 672 rpm. I read that in the magic document that explains the entire EEC IV operational strategy, but be damned if I can remember what that document is called. Its some internal Ford thing.