Engine Misfire - MustangForums.com

4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

Thread Tools Search this Thread
Old 05-18-2012, 10:09 AM   #1
3rd Gear Member
Thread Starter
04CompetitionOrange's Avatar
Join Date: Apr 2007
Location: ATL
Posts: 881
Default Engine Misfire

I haven't posted on here in a looooong time....

I had my engine bay detailed while at work today (the guy does travels to your work parking lot). The guy told me he was going to use a steam cleaner, protect all electrical items, etc. He calls me about an hour later stating that the check engine light came on, "but the car is running fine." I went down to check it out and sure enough its mis-firing. I assume that he got water on the COP's but don't have much of a way to tell since I am at work without tools and can't pull the plugs.

My questions is this...should the water eventually evaporate and the misfire go away or does the water foul out the COP and you have to replace it? I will not be able to do a code reader until this afternoon to see what the light is telling me.
04CompetitionOrange is offline   Reply With Quote
Old 05-18-2012, 02:51 PM   #2
Resident Ford Troll
WhiteFoxGT's Avatar
Join Date: Jul 2006
Location: Delaware
Posts: 6,224

Most likely the coil is poop. Find out which cylinder it is. Replace the coil and plug. And then send the detailer the bill
WhiteFoxGT is offline   Reply With Quote
Old 05-18-2012, 06:45 PM   #3
Go Texas!!!
Join Date: Jul 2009
Location: Lincoln, NE
Posts: 4,607

Just take the COPs out and dry them.
WannaBeGearHead is offline   Reply With Quote
Old 05-19-2012, 11:35 AM   #4
4th Gear Member
Z28KLR's Avatar
Join Date: Nov 2009
Location: SoCal
Posts: 1,539

Originally Posted by WannaBeGearHead View Post
Just take the COPs out and dry them.
This. I clean my engine somewhat frequently and use a leaf blower to dry it, never had any issues (also works good for getting water out of all the little places it likes to hide when you wash your car).
Z28KLR is offline   Reply With Quote
Old 06-26-2013, 08:38 AM   #5
Join Date: Jun 2013
Location: Michigan
Posts: 1

Sympton was kind of a "soft" miss up to about 2500 - 3000 RPM (manual trans & Son's car) and then it seemed to run OK or at least the problem was masked by the RPM. Throttle setting did not make any significant differrence. Started intermittingly about 4 years ago after a plug change at Dealer and was worse in damp weather. Carefully checked each COP and plug and AOK. Chased electrical as Son said He could re seat COP connectors on one bank and see short term improvement. Put in new plugs and one of the COP Boots had a very noticeable white area where spark had been jumping through. Auto Zone chap told me the COP Boots could be replaced so I bought a box of 8 for $40 and put it all back together with a lot of dielectric grease and the problem is solved. Simple cheap fix. The trick was that the COP boot must have been damaged by the mechanic but it took a while for the white spark trace to show up on the black rubber and that is why everything looked fine at the first examination. Hope this helps somebody out!
Obscurity is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Low RPM hesitation / misfire between 900-1200 Omgitsa88Stang 5.0L General Discussion 5 10-05-2015 07:33 AM
cylinder compression bconboy 2005-2014 Mustangs 16 09-21-2015 12:52 PM
whats needed to swap a 4.6L into ratrod rksnow1 Motor Swap Section 0 09-14-2015 08:46 PM
AODE Woes Pyrate Dave 5.0L (1979-1995) Mustang 8 09-10-2015 07:30 PM
V6 Engine Ticking Nick Oliver V6 S197 General Discussion 2 09-05-2015 10:34 AM

1993, 2012, 37, 98, body, cobra, cylinder, engine, fire, fowling, fox, mis, misfire, miss, mustang, s197, slight

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -5. The time now is 03:43 PM.