351w EFI install

[lonesouth]

After checking for vacuum leaks, I ordered a replacement IAC. 10 minutes and that fixed the high idle, now slowed down to 1,100rpm in park. It was always high, I can't get it down any lower.

 

[ba123]

Find the vacuum leak and fix if you can find.

When warm, disconnect your IAC completely and turn out the idle set screw until it just barely idles but stays running.

Verify your TPS voltage if you're using a stock Ford computer...I think somewhere around 0.98 is ideal but don't remember. You can loosen and wiggle/turn it to adjust slightly.

If your idle set screw it turned in too much, you'll never get the idle down and same if you have too much fuel or too much timing advance at idle.

 

[Timmy390]

This ^^^^^ also Power brakes? My booster diaphragm was leaking causing high idle.

Tim