3FE - why does oil fill cap affect idle? (1 Viewer)

[pappy]

Hmm, I like it! That would make it easier to check the oil vs the big air filter housing...

Do you have a write-up on the engine pictured? Is it 3FE? 2FE? What vehicle is it in?

If you don't mind, could I see a close up of your vac ports towards the back of the manifold? I am trying to see what ports you have capped off vs my install...

Write up at: http://bushrat.hdcruisers.org/3FEconversion.pdf

I have 3FE bits on a 2F block. So, call it a 2FE or a 3FE "stroker."

 

[PabloCruise]

Write up at: http://bushrat.hdcruisers.org/3FEconversion.pdf

I have 3FE bits on a 2F block. So, call it a 2FE or a 3FE "stroker."

That is a real nice write-up.

It looks like you are running the same fuel pump as myself - late 80's F-150 application? You are running a pre-filter as well? But it looks like you are running a high-pressure filter on the inlet of the electronic fuel pump? Why not run a cheapie clear (so you can see what debris is in there)?

 

[PabloCruise]

I have 3FE bits on a 2F block. So, call it a 2FE or a 3FE "stroker."

Do you know what that top port was originally plumbed to?

 

[PabloCruise]

So I seriously had to re-read this thread a few times and then go look at the PCV valve and plumbing towards the back of the valve cover before I got it.

The PCV valve plugs into the manifold after the throttle plate. so if the front port on the valve cover is open to the atmosphere, the PCV valve plugging into the manifold looks like a vacuum leak.

So I got a "T" reducer that measures 5/8x5/8x1/2 so I could splice into the line that allows metered air to go to the ISC.

I pulled the battery for a while to clear the computer and then took the Pig for a quick drive.

Idle seems smoother...

I look forward to taking her for a longer drive.

I wonder if PCV and ISC are too much for one 5/8" line?

 

[PabloCruise]

PS: after making this change, I opened the oil fill cap while it was idling and there was an immediate change in the idle for the worse.

 

[matt.mcinnes]

No isuess here with that

But interesting all the same.