hey guys need advice.

Well my truck started shakin and jerking on the highway then after a while the CEL came on, so took it to get it scanned and got the P0304 code twice for the #4 cylinder misfiring.
So decided to just go ahead and change all my plugs, and yes i ran into the plugs breaking in the heads! but anyways i got them out. Come to find out that it still shakes and jerks, of course i went ahead and put a new coil on the number 4 cyl. Ran it up and well, the jerking stopped but its still shaking and the rpm fluctuates.
Once again i went to get it scanned and now it brought up the #1 cyl. is misfiring, so yea, i went and replaced that coil also and no fix!

So in conclusion i have changed all plugs replaced coils in #4 and #1 cyl. It still shakes at idle, rpm fluctuates, and when i press down on the gas pedal it tries to stall, also the P0301 #1 cyl misfire code keeps showing up no other codes have popped up

Any ideas? I'd appreciate it

 

Come on guys any help. i just got cyl 8 missfire code yesterday and was looking for guidance.

 

I would say that you may have gotten a bad coil for the #1 plug but if the issue is still occurring you might want to consider replacing all the coils.

4x4 what I would say for you is it may be time to replace plugs and maybe the coils as well. Some people have to replace the boots as well at the same time it will just depend on what all is going on, how many miles you have your truck, and your driving habits.

 

With new coils in #1 & #4, I believe that I would swap the #1 coil with #4. If there are still issues on #1 then check the injector followed by testing the wire harness. Also the pins push in on the conector sometimes so check those also.

 

I have 75k on truck and my drive consist of 42 miles daily, 26 miles highway and other city. I typically accelerate at about 2000-2500 rpms and will hit it on interstate to merge with traffic.

 

Is there any trick to changing the coil on plugs. At 100K miles my truck misfired so a mechanic changed my plugs and truck ran fine for 5000 miles then misfired again. Had mechanic change #6 cylinder COPS and was good for another 5000 miles. Now it is misfiring again and I think I will change all of the COPS myself and was wondering if there were any tricks of the trade. Is there oil needed to lubricate or anything like that.

 

I like to put a little dielectric grease on the inside of the boot. Just a thin coating not a big glob. That is just a personal preference though not completely necessary.

 

There is a connector to a wiring harness and that is about it. The connecter will have a locking clip to hold while unplugging and check the pins to make sure none are pushed in or damaged.

 

when you need to replace one cop, you may as well replace them all as you will be anyway. just dont buy them from ford stealership.

 

Reid, I replaced my plugs and coils @ 71k. I used #7989 Champion plugs and #140033Accel coils. I now have 96k and it runs fine. Summit has a good price on the coils as does Jegs. They are easy to change.

 

Did you use too much anti-seize on the plug's barrel and possibly get some on the electrode which may cause a short? Anti-seize is a conductor.

Did you use too much Dielectric grease on the spark plug or in the plug boot? It is only supposed to be used inside the boot's first 1/8"-1/4". I also use it where the boot joins to the coil. Remember DIE-lectric doesn't allow currant to flow. Do not use it on the plug's tip.

When you reconnected to coil connectors to the coil pacs did you check to make sure none of the weather-pac seals fell out. Without them water can get into the connectors and cause shorts.

When you originally removed the spark plugs was there evidence of water in some or all of the plug bores? If so, the Boots should be changed as they are deformed from heat and won't keep water from entering the bore which may cause misfires.

One final thing. Try disconnecting the battery for a while to reset the Keep Alive Memory, KAM. The pcm will relearn new driving parameters.

There's my ideas