TOPIC: Grooving ford f150

Hello everyone
I am planing on grooving my first truck a 1990 ford f150 5L. V8 dual throttle body any hints? And what to look for
On this Truck appreciate any help

Thanks christoph

I use the middle bit they are easy, but usually very dirty ,you do both throats

the pcv vacum is towards ft intake, check for soft vacum lines they usually are oily and weak

Thanks Dan I just maybe replace all the vacumlines just to make sure

Thanks Christoph

Just done the groove on my ford put the throttle body back in and started truck sound smoother and it sound like it idles lower? Haven't done the spark plugs yet. I have closed of the idle air supply to 1/4 "both sides,
Pre mod my vacuum was 17,5 should there be any change post mod not at idle right because the throttle plate is closed ???

Pictures to follow in the next post

Thanks christoph

How to I add pictures ??

Christoph

Hi Christoph,

Sounds like your in the right direction.

Post mod manifold vacuum will be increased by doing two things,
1 - reducing the idle air pathway, which you have done
2 - moving the pcv line off of the intake manifold and capping that port (biggest leak)
and moving that hose to the intake plenum side of the TB in close proximity to the TB inlet.

I've seen vacuum levels of 20" to 21" post mod on some vehicles.
Manifold vacuum is typically at it's highest when the engine is at idle.

Depending on your results, you might consider reducing the IAC pathways down to 1/8" each, but this is also going to depend on the winter temperatures in your area.


Groovin' Good

Karl Fortner
Tacoma, Washington

The reduction in IAC path to 1/8" is simply a starting point. What I do when I perform this mod is instruct the customer they may have issues with cold starting at first. The computer will generally correct for this within a week or so. If not, then we simply increase the diameter to maybe 3/16" and see how that works.

If the client is resistant, 1/4" will generally be enough. This is the size I use when the client is remote or traveling. That way, there is less likelihood of an issue causing customer dis-satisfaction.

Have fun!

Hello OK so see if this woks to download those picture??

Hey Chris,

I know this is a bit off the Ford F150 topic, but can you tell me more about the egr blockoff modification? (For testing purposes try bypassing the EGR with a flashing gasket).

I don't know anything about this, but want to try it.

Thanks,
Jonathan

Hey Jonathan

It's just a pis of aluminium flashing ( sheetmatel) between the egr falve and the manifold to just block the flow of exhaustgas to the engine


Christoph

Thanks guys,

I think I get it. A solid flashing gasket keeping the exhaust manifold gases from going up the EGR tube to the valve. But does it then throw a code if nothing's going up that tube to the valve?

Hello everyone
Just finished butting the truck together
I took the TB out again and glued the idle air closed again and reedrilled with 1/8 drill as you guys suggested
Done the spark plugs and rounded of front of TB intake side, and I closed of egr valve
Tomorrow I am going for a test drive see how it does


Rounded intake


ITA clued closed


Pic of the groove

Thanks for now Christoph