My 01 With a 4.7 and about 125000 miles has been running rather rough lately so I did a tuneup on it but my idle problem is still there. It will fluctuate from about 600 to 1000 RPM and I have noticed that it does it some times when I am driving down the road. When I am going about 40-45 MPH sometimes it start doing it and cause the tranny to keep shifting out. Any ideas on what might be the cause?

Tony

 

Tony:

Sounds like the TPS (throttle postition sensor) is bad. Will cost you ~$30 or so, and is pretty easy to change.

I think it is secured to the throttle body with 2-3 screws.

Don

 

Thanks Don, I will take a look at that. Is there anyway of that you know of to verify that the TPS is bad?

 

Tony:

I am sure there is, butI don't have a factory service manual to know the procedure. At 125k though, your oem one has given you your monies worth. I would make the swap just on principle. My bet is that a new one cures your ills.


Don

 

Well, I stoped by Advance Auto on my home yesterday and spent $40 for a new TPS and installed it when I got home and my problems seem to be solved.
Thanks for the help Don.

Tony

 

Tony:

Glad to hear it.
So many folks seem to be having similar issues as of late, and the TPS seem to be the magic bullet.

Don