#2 and #8 has no spark on the cole

Asked by Nov 15, 2017 at 07:14 PM about the 1997 Ford F-150

Question type: Maintenance & Repair

i have a 97 f 150 and I have put 2 different cole
packs on it when I start it up it burns out #2 and #8
ever time on the cole pack anyone know what it
maybe

8 Answers

26,025

Coils may be fine and your computer or signal to computer is not fine.

26,025

Ignition coils have failed. Often times this is due to excessive spark plug gap. To fix this problem, the defective ignition coils, spark plugs, and all coil boots should be replaced.

26,025

Use di-electric grease in both ends of spark plug end boots and in coil(s) electrical connections.

26,025

If it continues to fry coils, then you need to test the wire harness to and from computer, and all grounds to frame from motor and battery and/or replace the computer as there are known issues with this on these models and some never have the issue while others are plagued with this issue so I believe there must be an issue in the wire harness or computers for it to re-occur or new one coils going out. Most just say replace the coils but I would test the wire harness if spark plug gap is correct.

26,025

Also these models if still OEM has upper intake vacuum ports under the intake between the upper & lower intakes (front center & rear passenger side) These take a 90 degree boot with two different sizes on the ends. The OEM 90 degree boots fail in just a few years, The only place to get these boots is the dealership. The dealership now has a improved part for these and yours may be bad and need replaced. This could if left to leak vacuum cause problems which may or may not affect the coils directly but will cause the computer to send signals according to the information sent to it which if vacuum is leaking will be wrong signals. These 90 degree vacuum boot connectors are very hard to get too and replace for most people. The rear one is not under as much misalignment but can blow out as the front one is more likely to blow out in the bend of the 90 degree turn.

so fire I got 2 new Coils put them on it and I started it up after about 1 minute with it running it burns the coils out it busts the top of the coil pack and it starts leaking black goo out of the top where it is bisected but like 4 months ago I put new plugs and wire's on it it was running really good I was driving it and all at once I thought it jumped time the check engine light was flashing the codes said miss fire on #2 and on #8 and coil d

26,025

High resistance in the spark plug wires and plugs. These coil packs just can not take much.

26,025

If coil modules are after-market and not from Ford, that would be the other reason because they're not made to factory specs.

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