Dangerfield23

I recently installed a '99 Explorer intake on my 5.0 and I now have an idle problem. After hard excelleration it will not come back down to an idle, it stays around 2k rpm. I can unplug the IAC and it will idle back down to normal. I have replaced the IAC assembly, I installed a new computer, I installed a new throttle body, and I have a spacer block between the IAC and throttle body for more precise idle adjustment, but I still have the same problem. Anyone ever have this type of problem or have any tips?

03GTType

did you by any chance use the maf off of the explorer too..

99saleen351r

Read this post and do what is said it will fix your problem.Try a search next time and chances are you'll find the answer to your question
https://mustangforums.com/m_646273/tm.htm

Or this one http://forums.stangnet.com/showthread.php?t=470711

Dangerfield23

I did not use the maf off of the explorer. I was told that it was not necessary. I could be wrong.

Dangerfield23

Isn't a restrictor plate essentially the same thing as the bypass plate I have? I can adjust the screws to restrict air flow.

Dangerfield23

Thanks for the info, but I tried the restrictor plate and it didn't fix my problem. It almost helped a little, but it didn't fix it. It also caused some additional problems so I took it off. Some of the feedback I have gotten in other forums have suggested that I may have a vacuum leak that I have overlooked. I figured if it were a vacuum leak it would idle high no matter what. But I can unplug the IAC and it idles fine. Would a vacuum leak somehow make the computer open the IAC?