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Old 10-31-2017, 05:11 AM
EaOutlaw1969 EaOutlaw1969 is offline
Ford Ranger Driver
Join Date: Jul 2015
Posts: 901
Default Re: P0401 this is KILLING ME!!

Originally Posted by Grubb44 View Post
Ok hoses check out. Took to a local shop who I trust. Hooked computer to the truck, the "rough" idle on startup is the truck starving for air. So he tested the IAC. IAC was clean and appeared to be working fine. Could open and close with his computer. Cleaned throttle body and tried again. Same "rough" idle. It's NOT a misfire all electronic firing components are working as they should. I went ahead and replaced the IAC. Ya $40 but completely ruled out the rough idle even being an issue with the IAC now. Just dropped her back off the the shop so he can test and monitor it more. Any leads would be helpful. Thank you.
I am pretty sure I already told you how to fix this issue.

This problem should not have taken more than two hours to complete all the pin point test if you have to go all the way to the end of the pin point test.

You brought it to a Tech you trust, yet he did not bother to run the pin point test for your code? sounds like a Tech I would not trust to change my oil.

For the 40 bucks you spent on a part you could have purchased a manual and a DVOM and would have had this problem diagnosed a long time ago.
2002 Ford Ranger 2 Dr Standard cab 2.3 5 SPD 7.5 373 gears
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