Iac?

[Martymar219]

Hi I was wondering if the IAC would cause a P0401 Insufficient EGR Flow code. The reason I ask is my truck will stall out when I park it and idle rough when starting it. I read how to clean the IAC out and after I did that it ran fine for about a day, and now is worse!

So I plan on buying a new IAC, But I still dont know if the code could be for something esle.

Thanks

 

[brianjwilson]

I never got a code from bad IAC valves. I also tried cleaning a bad IAC valve and it got worse like yours.
I'm guessing that the P0401 code is un-related and that the EGR valve needs replaced. That's what happened when I got that code on my wife's 97. Replace the IAC valve and reset the computer, see what happens. Don't worry, the EGR valve is easy to replace.

 

[Martymar219]

My issue is, the EGR Valve or the EGR pressure sensor. I just dont feel like spending the money and it be the other part. Is there any good way to find out which one it is?

 

[Martymar219]

Also, does anyone know exactly were the EGR sensor is on a 2001, I know were the valve is but not the sensor. Thanks again for the help!!!!

 

[dblock217]

I had the same code pop on my 96 XLT 4.0L and it was the EGR Valve Position Sensor and havn't had a problem since!

 

[Martymar219]

Just got the parts today and put them in. I replaced the IAC and the ERG sensor. So far, so good. I just hope this is the fix....will keep ya posted.