2.7 high idle and bogging

[D'arce]

This is a new truck and motor for me. It idles around 1000 when I first start it. Sometimes after it warms up I can restart a couple times and it may drop down to around 700. Usually its pretty happy to sit at 1k.

The second issue is a bogging down and temporary loss of power at around 2500 rpm. I can downshift (manual) and rev through it and when I up shift past 2500 all is well.

What I have done so far.
-cap and button (cracked and worn)
-plugs and wires (unknown age)
-cleaned IAC (not too bad actually)
-replaced TPS (even though the old one checked out via voltmeter)
-cleaned MAF (not dirty that I could see)
-cleaned tb (fix for sticking gas pedal)
-replaced a couple of rotten vacuum lines
-replaced PCV (just plain nasty)
-replaced leaking water pump
-cleaned battery terminals

There is no CEL. Truck has 250k miles on it. Motor runs smooth with an occasional burble. Doesn't burn oil. Getting around 20 mpg. Everything I have done so far I chalk up to basic repairs and maintenance.

I don't want to get into a habit of throwing parts at it so any suggestions would be greatly appreciated.

 

[D'arce]

Could a faulty temp sender cause the high idle?

 

[Kanoe]

That Idle is not horrible. Mine also idles about 1000 or slightly less until it hits full warm temp at about 80+ degrees C then it settles in at 650 to 700.

Is yours getting up to proper temp or could you have a stuck thermostat keeping it cooler?

Sorry, no help on the bogging except a wild guess of dirty fuel filter? Not a bad idea to change it anyhow.

Good luck.

Edit: if you are not aware of the exhaust valve clearance issue with the 3rz, do a bit of reading. Not likely your problem but a good thing to know about.

 

[D'arce]

Thank you for the reply...it does get fully warmed up. It is not until it has gone through a couple of restarts that the idle finally settles down when its at temp.

 

[D'arce]

After a couple of short drives it feels like the hesitation is gone. I'm thinking the TPS fixed it. Without any insight into the high idle I think I'll start looking at vacuum hoses...