I've been wanting a Screamin Demon for my truck since Maurice's thread, I want to see how it will affect a stock 4.0. I finally hit up underdog-performance for one along with some 8mm wires, and I picked up a set of Autolite double platinums. I will be installing everything this weekend and will update this thread as things progress.

EDIT (7/31/07):

I finally got to drive my truck with the new set up last night and this morning, and it's nice! I totally agree with Maurice's results, better idle, pickup and acceleration. I'll have an idea of highway gas usage this weekend on my Buffalo trip.

My last fill up before coil change was 16.5mpg mixed city and highway, I usually get ~18mpg at ~100% highway.

(8/10/07) Filled up last night - 17.5mpg mixed driving

 

Please do keep us updated. I'm interested in this. btw, how many miles on your truck?

Rich

 

good call...

 

It's about to turn 49k

 

I am interested in seeing the results as well....

 

x2...

Maurice how did it help your truck?

 

it helped quite a bit.....smoothed out the idle, acceleration, and general running.....

 

If i decide to get a screaming demon coil pack for my ranger, do i need anything else to go along with it? or just drop in the pack and away i go?

 

I would swap plugs and wires at the same time. It is recommended to change the GAP on your plugs, so you might as well change them, IMO.

 

drop in the new pack and go...

 

ok, cool, thanks for the info.

 

don't you have to re-gap the plugs?

 

Hey Maurice, did you regap your plugs or no?

 

he did, yes

 

I installed my coil pack, 8mm wires, and new plugs i regapped to .060 a few months ago. And i can say i didnt notice a lick of difference in anything.

 

I put one on my truck recently and haven't seen much of a differance either. My old coil pack had lots of miles on it, so i figured i would give one a try. I have not checked my mileage with it yet but will soon.

 

will one of thoes fit onto a 94 4.0?

 

yes i regapped my plugs.....they are sitting at roughtly .065" gap in them....my stock gap was .054".....

 

You stock gap is probably .65 anyway. My 04 stock gap is .065 so a coil pack would have done nill difference.

 

Update!

 

man i need one........im broke 4 now

 

Update

 

put a sd pack in my ranger today, acceleration was a bit quicker, startup was fast and the idle seemed stronger, must finish tank of gas with seafoam then a tank of regular gas and see what changes i get.