hello, i just got through putting together my engine after having a valve job done but my poor truck is idling way to high. she doesn't have a tak but im geussing its idling somewhere in the 1.5k range. my buddy and i think its a vaccum leak but ive spent days trying to figure it out. please any help would be great.

 

Ford F150...? size motor...? EFI....or carb...? is everything back together as far as air cleaner...? various other hoses and tubes that don't run directly to carb or fuel injection body....?

 

Like SmilinEd sayin. The more infor you provide, the more we can help.

Also kinda sounds like a vacuum leak to me.

 

f 150
straight six (300)
EFI

 

Genaraljjw

make sure you have double checked all vacuum lines, tubes and sensors. I cannot stress that enough.

Mustang LX Throttle Positioning Sensor ( TPS ) Voltage - YouTube

 

This might also help. Had to follow this after I rebuilt my 351w. Kinda small. but I think you can read it.

 

Ok someones gotta ask might as well be me, the throttle/throttle cable/pedal, is it setting against its stop screw fully returning to the closed position?

If so and it idled right before getting tore down for the valve job then yea I agree, vac leak.

You've checked all vac lines associated canister etc, and checked the throttle body/EGR/IAC etc etc gaskets yea? well then that pretty much leaves the intake gasket/s as only thing left.

 

Now i know its bad to break stuff but i broke the EGR rail while trying to remove it, so i made plugs for the open holes. that was what i was told to do by a friend of mine. For the vacuum leak im at a loss im new to cars/trucks and the vacuum diagram on my air intake makes no sense.