Rough idle- rough driving
Cargo Master
Joined: Jul 2009
Posts: 2,885
Likes: 26
From: Chino, California
I think you still have a misfire.
New coils usually come with new rubber boots. If he changed those 2 only, then I would guess he changed the boots on those 2 as well?
I would start with changing all the plugs AND boots. Those rubber boots act as an insulation from the electrically charged spring from grounding out on the cylinder head, hence, a misfire. I'd stick with Motorcraft plugs. New ones are 1 pc. design from what I understood.
After that and you still have a misfire, then I would start looking at coils...but check swapping out one at a time. Rockauto has them about $45 each.
New coils usually come with new rubber boots. If he changed those 2 only, then I would guess he changed the boots on those 2 as well?
I would start with changing all the plugs AND boots. Those rubber boots act as an insulation from the electrically charged spring from grounding out on the cylinder head, hence, a misfire. I'd stick with Motorcraft plugs. New ones are 1 pc. design from what I understood.
After that and you still have a misfire, then I would start looking at coils...but check swapping out one at a time. Rockauto has them about $45 each.
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Senior User
Joined: Nov 2006
Posts: 271
Likes: 0
From: Odessa
Im going to look into those coils from rockauto. He sold me the coils today at 80 a peice. If i go back to the motorcraft plugs, can ileave the champions in there or exchange thoae aswell?
Cargo Master
Joined: Jul 2009
Posts: 2,885
Likes: 26
From: Chino, California
I saw Amazon has the Motorcraft DG-511 coil for about $40 and as low as about $36. SP-507 plug is about $12.50 each. If you have Amazon prime, you could get the 2 day shipping.
Not sure about '07, but my '02 is picky about using only MC or Autolite plugs. I would keep them all the same.
Last edited by jh818; Jan 22, 2013 at 01:38 AM. Reason: Had the wrong year. Thought it was '09 for some reason.
Cargo Master
Joined: Jul 2009
Posts: 2,885
Likes: 26
From: Chino, California
Double check which plug is the one piece design that fits your engine. My research so far tells me that in late '07 was when Ford went to the 1 pc. design. If you had the 2 pc. design, not sure if they are compatible.
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Senior User
Joined: Nov 2006
Posts: 271
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From: Odessa
I will start ordering plugs this weekend. Just dont want to take it to ford to change spark plugs. Im just nervous about them breaking off
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New User
Joined: Apr 2012
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I used a Dewalt 12 volt cordless impact to remove all 8 of my spark plugs. None of them broke. I had them all out in less than 45 minutes. That included removing the C.O.P's and pouring a little bit of MC Carb Cleaner in the spark plug well.
I did add the recommended amount of MC Carb Cleaner (1/2 to 3/4 teaspoon, barley covering the nut of the plug) down into the spark plugs wells, and drove around for a week. My thought was to allow the cleaner to wick down as much as possible. The day before removing my plugs I did get a misfire out of one of the cylinders. I guess it wicked down enough.
I did add the recommended amount of MC Carb Cleaner (1/2 to 3/4 teaspoon, barley covering the nut of the plug) down into the spark plugs wells, and drove around for a week. My thought was to allow the cleaner to wick down as much as possible. The day before removing my plugs I did get a misfire out of one of the cylinders. I guess it wicked down enough.
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Senior User
Joined: Nov 2006
Posts: 271
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From: Odessa
ok guys so im about to tackle changing out the plugs. I think im going to go with the impact to remove them. I just have one question. Heard of some guys adding carburator cleaner to a few tanks of fuel to remove carbon from the plugs and make for easier removal. Is this a good idea?
Logistics Pro
Joined: Mar 2001
Posts: 4,157
Likes: 3
What color boots on your coils?
Hesitation is 90% prob. bad coils. The can either fail outright or slowly fail causing missing and hesitation. These plugs last a long long time. Even at 100K mine looked almost new.
No need for carb cleaner. PB Blaster-squirt a few blasts, let soak for a couple of hours.
Hesitation is 90% prob. bad coils. The can either fail outright or slowly fail causing missing and hesitation. These plugs last a long long time. Even at 100K mine looked almost new.
No need for carb cleaner. PB Blaster-squirt a few blasts, let soak for a couple of hours.
Freshman User
Joined: Jan 2013
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i had arough idle and misfire on my 5.4 l 3valve all the time.
- changed all the plugs to autolites. there was already cheap champions in there and one electrode was burned right off.
idled and ran better after that except when it was cold, w/o a 5-10 min warmup in our cdn winters it still ran rough and idled poorly but otherwise was now running good.
i suspect i have a fuel problem like leaky injector or clogged injector that caused the burned off plug.
changed fuel filter and checked fpdm , it was a little rusty but looked intact so remounted it on standoffs to prevent future rust.
how can one narrow down a bad injector?
i would post pics but wont do photobucket or anything
- changed all the plugs to autolites. there was already cheap champions in there and one electrode was burned right off.
idled and ran better after that except when it was cold, w/o a 5-10 min warmup in our cdn winters it still ran rough and idled poorly but otherwise was now running good.
i suspect i have a fuel problem like leaky injector or clogged injector that caused the burned off plug.
changed fuel filter and checked fpdm , it was a little rusty but looked intact so remounted it on standoffs to prevent future rust.
how can one narrow down a bad injector?
i would post pics but wont do photobucket or anything