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Old 12-17-2013, 11:56 PM   #1
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Misfire

On the coil pack where you plug the end of the spark plug wire into it, there is a hole. It is on tup and it looks like it was caused by spark because its burnt. Can this cause misfiring because my car is misfiring a lot.
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Old 12-18-2013, 12:55 AM   #2
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Not quite sure where you are talking about but at any point from the cop down, if there is a hole, it will spark to the head instead of through the spark plug...causing a misfire.
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Old 12-18-2013, 06:13 AM   #3
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The hole is on the coil pack where you connect the spark plug wire
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Old 12-18-2013, 07:55 AM   #4
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Oh, well try running the car when its dark and see if you see and sparks
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Old 12-18-2013, 05:11 PM   #5
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Ill try that. I changed the coil pack and it's still misfiring
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Old 12-18-2013, 05:58 PM   #6
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If the coil pack is burnt around the hole you're mentioning, you definitely want to take care of that regardless if it's causing the car to misfire. Eventually the coil pack will be completely burnt up.

Check your other coil packs too. If one is in rough shape, there's a good chance others are too. Are you getting individual misfire codes by any chance?

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Old 12-18-2013, 07:47 PM   #7
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What year is ur mustang? V6 or v8?
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Old 12-18-2013, 10:55 PM   #8
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2003 v6 and it was just one that is burnt up but I replaced it with a new coil pack but is still running like crap

---------- Post added at 11:55 PM ---------- Previous post was at 11:54 PM ----------

I just ran it in the dark and didn't see any sparks
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Old 12-18-2013, 10:59 PM   #9
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Misfire

Pull plugs, and check your wires if you haven't already.

Are there any codes that pop up?
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Old 12-18-2013, 11:55 PM   #10
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Ok so first we need to find which cylinder it is then we'll go from there. So see if there are any codes and what they are, if u dont have a code reader just unplug one cylinder at a time and the one that doesnt make the engine run worse is the one. Then unplug the injector and test it with a noid, then test spark.
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Old 12-19-2013, 10:14 PM   #11
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Okay I changed the wires today and checked out 3 plugs. What does it mean if the plug is really white? I put in new plugs like 2 months ago

---------- Post added at 11:14 PM ---------- Previous post was at 11:14 PM ----------

Ill see how it runs in the morning
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Old 12-19-2013, 11:36 PM   #12
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Misfire

Could mean that the plugs are very old and have alot of mileage on them, or i believe it can be a sign of your car running very lean. As you said, check and see how it runs tomorrow, then go from there.

Edit: just read you said you changed the plugs 2 months ago. I would suspect your car may be running on the lean side.
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Old 12-20-2013, 01:54 AM   #13
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Check for vacuum leaks
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Old 12-20-2013, 05:20 AM   #14
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So I just drove to work and it seems fine as of right now. I'm still waiting for the SES light to turn off though
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Old 12-20-2013, 06:34 AM   #15
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Good!
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Old 12-20-2013, 09:17 PM   #16
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I've found that this is a common problem with our model mustangs. (99-04 V6) and a few GTs in this model year. I've had a misfire since I bought my car, I've done just about everything but replace the heads, and valvetrain. Each thing I've done will clear it up for a little while but it comes right back. I'm hopefully going to be changing the heads/valvetrain this tax season and we'll see if that fixes it.

List of attempted remedies:
Plugs
Plug wires
Coil Pack
Oil Change
Fuel filter
Seafoam
EGR Delete
MAF cleaning


No vacuum leaks, and my fuel pump works fine. The only things I can think that it would be is maybe a semi-clogged catalytic converter, or leaking valve seat/stem seal or rings.

I hope for you sake one of the things that I've tried already fixes your problem though.
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Old 12-21-2013, 04:00 AM   #17
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i had a bad coil pack that was cracked and you could see it spark at night, yes, it will cause it to misfire! personal experience with this haha, just get a new coil pack and it will stop misfiring

---------- Post added at 04:00 AM ---------- Previous post was at 03:57 AM ----------

it almost sounds like a bad wire or plug but i can almost 99% guarantee its the coil pack, exactly what happened to mine, 03 v6 5 speed
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Old 12-21-2013, 11:11 AM   #18
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Could also be vacuum leak if its idling a little high or clogged or bad fuel injector.
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Old 12-21-2013, 08:03 PM   #19
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Yea i changed the coil pack and wires and it's running good now!
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Old 12-21-2013, 08:36 PM   #20
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Glad to hear it.
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