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Ford 9N, 2N & 8N Discussion Board

Update on Mustang

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Posted by gwstang on April 06, 2014 at 16:42:02 from (

For your entertainment purposes only.

'66 mustang with 5.0 HO engine with EFI Speed Density wiring/computer.

Update on stumble when taking off, then runs like a scalded cat.

I changed the plugs/wires.

Adjusted the tps to .90 (book says anything from .65 to 1.0 is okay) Had to elongate the holes a little to achieve this.

Got some of the stumble out but not all.

It acts like a small intake leak somewhere but I have sprayed starter fluid all around and no leak or change in idle.

The idle does fluctuate a little up/down when it is warmed up. Acts like it going to die when I shift into gear (auto transmission) unless I feather the gas a little.

I will check the trouble codes (if any) tomorrow and maybe that will point in another direction.

This efi stuff is way more complicated than the old school carb stuff ever was. Also, changing the spark plugs on a '66 with the very close shock towers (they went wider in '67 and up) is a major teetotal absolutely complete cluster #@*^ with headers involved. I skipped the compression testing because of this. Ceramic headers do get scratched up btw. :evil:

Other than the hiccup, it runs great.


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