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Old 08-20-2012, 10:03 AM   #1
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Cylinder 4 Misfire

Hi all,

I've been noticing recently that my car judders alot on acceleration and generally not performing as well as it should. I plugged in a cheap little fault code scanner i bought from ebay and it pointed me towards Clyinder 4 Misfire.

I've done a bit of googling, and changing the coilpack seems to be a good first step, the car was fully serviced with new plugs about 4 months ago.

One thing that's confusing me, though, i've looked on the internet for coilpacks, it seems like it's one whole unit? Is this correct, or am i looking at entirely the wrong thing!

Any help would be great
Sam


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Old 08-20-2012, 10:10 AM   #2
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Originally Posted by samclarke666 View Post
Hi all,

I've been noticing recently that my car judders alot on acceleration and generally not performing as well as it should. I plugged in a cheap little fault code scanner i bought from ebay and it pointed me towards Clyinder 4 Misfire.

I've done a bit of googling, and changing the coilpack seems to be a good first step, the car was fully serviced with new plugs about 4 months ago.

One thing that's confusing me, though, i've looked on the internet for coilpacks, it seems like it's one whole unit? Is this correct, or am i looking at entirely the wrong thing!

Any help would be great
Sam
I believe your coil pack is one unit but someone from across the pond would have to confirm - they are a little different here in the states. Usually, if the coil pack is the issue in this regard you will have two cylinders misfire (2 cylinders are fired from the same coil). There aren't any particularly "known" issues to a #4 misfire so someone needs to perform standard misfire diagnostics.
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Old 08-20-2012, 04:35 PM   #3
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Interestingly I had this same code about a month ago. I was worried that maybe the valve seat was getting ready to go as I have an SPI engine in my Focus, a 2002.

Anyway, I pulled the plug wire off of the #4 plug and noticed that it was dirty with some corrosion. I cleaned it up, added the dielectric grease to the boot and went about my way. Been fine since.

Maybe you need to look at that option before spending money on a coilpack.

PAv
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Old 08-20-2012, 06:33 PM   #4
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Check connections and plugs to be sure they are good first. If so then it is your coilpack. Don't know what motor you have but should only take about 10-15 minutes to change. In the states here the coilpack is only about $100 U.S.
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