Help! Rough Idle

[ddenton749]

Found It!

I found the problem! Hooray! While looking for a vacuum leak, I sprayed some carb cleaner on the #6 injector and the idle changed. I bought injector O-rings and intake gaskets and got to work Sunday night. When I took the upper intake plenum off, I found the real culprit. It was the gasket between the fuel rail and the lower intake. Somehow the gasket moved and was sucked inwards. The leak was in the back right near the #6 injector, so that's why it appeared to be the #6 injector O-rings. It only took about an hour and a half and the X is running fine again, with new upper intake gaskets and injector O-rings.

Last October I replaced the lower intake gaskets due to a coolant leak. Maybe the gasket in question was damaged or moved when I reinstalled the fuel rail? Maybe they were cheap gaskets? Who knows. Anyway, I've learned that when the O2 sensors both/all read lean, then it probably is. I'm glad I didn't replace the sensors.

Thanks to all of you for your help.

 

[outrun84]

might be a simple thing

I had a spark plug stop firing on my X and because ford said they would replace it for free i naturally went for it. About two or three days later i had the same problem with my explorer. What it turned out was that it just needed an entire new set of spark plugs. It is amazing what the new factory plugs did for it. She's got an even idle and smooth acceleration again. So i would consider looking and them for the hell of it.

 

[DonM]

Wow lucky find.

Glad ya got things running good!