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JoeGrzesiak 03-03-2013 04:31 PM

Horrible misfire
Hi, I am new here and have searched for a solution, but couldn't find much.
A couple days ago I was driving and it started to jerk, like when my coil pack was bad. So I replaced the plugs, wires, fuel treatment stuff, and a fuel filter. I just got a new coil pack and now I've got a check engine light saying misfire cyls 1 and 4. Now it barely wants to run. Once in a while before I shift it runs decent before it runs horrible again.

JoeGrzesiak 03-04-2013 07:03 AM

Now today it doesn't want to idle.

mikebontoft 03-04-2013 07:10 AM

have you checked the pins and wiring at the electrical connector to the coil pack?

Many people have had a problem as you are describing because a pin has backed out, causing half of the primary system to fail.

JoeGrzesiak 03-04-2013 08:12 AM

I just went out to look, what is the best way to check it? and best way to repair? Thanks again

BC_ZX3 03-04-2013 08:18 AM

Motorcraft part # WPT-517

How to link:

JoeGrzesiak 03-04-2013 09:08 AM

Awesome, thank you guys. I'm gonna grab a pigtail after work. Hopefully that's what's wrong.

ShoOff 03-04-2013 09:29 AM

a leak in your intake manifild can also cause mulitple cyclinder misfire and such

JoeGrzesiak 03-04-2013 10:25 AM

But could that get progressively worse also?

BC_ZX3 03-04-2013 07:15 PM

When you get a misfire in cylinder 1 and 4 as a pair (or 2 and 3 as a pair) it's usually indicative of an ignition primary circuit problem since the Ford "wasted spark" ignition system fires the plugs in those groupings. Of the three wires comprising the ignition coil connector, one of the two thinner outer wires should show physical damage, chafing, splitting or corrosion. (The thicker middle wire is 12V supply.)

Easiest thing to do is to simply tug on the wires; they usually break or come apart if bad.

If the problem is severe and persistent enough, eventually you'lll throw a DTC code - P0350, P0351 or P0352.

JoeGrzesiak 03-04-2013 07:26 PM

Yeah I started to pull the harness apart and when I was moving the harness around, one of the wires fell off. So I'm hoping when I replace that, everything will be ok haha. I was going to post a picture, but I figured you all have seen that before. Also I have no idea how to post pictures. Haha

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