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Engine misfire cylinder 5 and now 7/8

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Old 12-22-2013, 01:21 AM
dsundby10 dsundby10 is offline
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Engine misfire cylinder 5 and now 7/8

Alright so I had the worst luck these passed couple days, truck started running like crap 3 weeks ago(misfiring), long story short FINALLY got the p305 code, So I popped on a coil pack on cylinder 5, but when I took the coil off I saw a good amount of oil ON top of the spark plug, (I think I may have had some leak in there from earlier that day) But it ran perfect for about 2 days (then I replaced it with a NAPA one cause I get a huge discount there) I plugged that one up and all was good. 2 days later, back to misfiring but even worse, ran the code p305 ...again.. so first thing I did was blame the coil pack. Replaced the spark plug first then replaced the coil pack (tested 3 different ones), still misfiring badly.. So, I got home tonight and decided to do one more scan and now its p305 /p307/p308. I previously replaced 3/4/8 coil packs about 3 months ago. Im gonna replace 7/8 tomorrow as well to try to clear that code. But for # 5 any suggestions? Also 5,7,8 are all on the same side does that mean anything in particular as in maybe its not the plugs/coils , maybe bad fuel injectors / gaskets / anything else?
Thanks for reading, really hope I can get some more ideas on what to do tomorrow for this annoying problem.
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Old 12-22-2013, 02:31 AM
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Forgot to add that is a 2000 f250 5.4l, and also last week had a System lean bank 1 code (big leak on pcv valve vacuum hose, but replaced it and no more code)
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Old 12-22-2013, 03:54 AM
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Been researching all night, any one think the cat is bad?
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Old 12-22-2013, 07:24 AM
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misfires...replaced coil packs and still bad. What about the plugs, check them for condition and what about the spark plug wires? Maybe time to change them.
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Old 12-22-2013, 08:48 AM
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Quote:
Originally Posted by dsundby10 View Post
Been researching all night, any one think the cat is bad?
No, there is nothing wrong with your cat.

Quote:
Originally Posted by dsundby10
So I popped on a coil pack on cylinder 5, but when I took the coil off I saw a good amount of oil ON top of the spark plug, (I think I may have had some leak in there from earlier that day)
The oil most likely came from a leaky valve cover gasket. My Excursion had that, but the passenger side valve cover is a PITA to remove so I never bothered getting it fixed. I can see oil fouling things up if the leak is severe.

How does everything look? Is there a lot of oil leaking from the valve covers? Have you tried swapping coils and seeing if the misfire follows the coil? You shouldn't go replacing parts like that unless you have confirmed that the parts are bad. In your shoes I wouldn't even THINK about replacing your #7 and #8 coils until you do some more diagnosis. Try swapping them with your #1 and #2 coils and see what happens!
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Old 12-22-2013, 10:18 AM
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Could also be your intake manifold is leaking and it's antifreeze, not oil. Same slick feel and pretty common issue. I wonder if the manifold issue has migrated?
I would take the COP's out and inspect with a mirror as 7 and 8 will not be easy to see.
Once they start to fill up, they COP's ground out intermittently and create havoc.
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Old 12-22-2013, 10:56 AM
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I would also look at an injector failure as well .
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Old 12-22-2013, 12:56 PM
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Really appreciate the replies, I'm gonna start cracking at this right now. Will give feedback.
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Old 12-23-2013, 02:23 AM
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So I decided to change all the spark plugs today and switch up the coils. I switched up coil # 1 with #5 / #2 with #6 / #3 with #7 and #4 with #8 . While I was doing that I think I bent one of the bolts , so i put the bent bolt ( only could screw in half way ) on #4 for easy access to hopefully get a new one tomorrow. So i cranked it up after everything and drove to do coldisack and back (slowly). Turned it off and got a new code P0353 , along with my misfire 5/7/8 still. Any ideas? Is that loose bolt on # 4 possible causing p3053 code?
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Old 12-23-2013, 07:57 AM
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Check fuel pressure while idling and going down the road.
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Old 12-23-2013, 12:28 PM
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Quote:
Originally Posted by dsundby10 View Post
So I decided to change all the spark plugs today and switch up the coils. I switched up coil # 1 with #5 / #2 with #6 / #3 with #7 and #4 with #8 . While I was doing that I think I bent one of the bolts , so i put the bent bolt ( only could screw in half way ) on #4 for easy access to hopefully get a new one tomorrow. So i cranked it up after everything and drove to do coldisack and back (slowly). Turned it off and got a new code P0353 , along with my misfire 5/7/8 still. Any ideas? Is that loose bolt on # 4 possible causing p3053 code?
That's a faulty COP connection. There are 2 tabs that have to align when plugging the COPs back in. You should also feel a "click" when fully connected.
Because you have more than one issue with COPs, you might check your PCM too for solid connections.
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Old 12-23-2013, 12:41 PM
dsundby10 dsundby10 is offline
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Alright so I cleared the codes took it for a 5 minute test drive, still getting misfires. Pulled the codes and now its only a p303 and p3053, I looked at all the connectors couldn't see anything wrong though, Any thoughts of this bvm coil that I bought from advanced being faulty?
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Old 12-23-2013, 01:20 PM
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Ok so apparently either im an idiot or the code reader is an idiot? P3053 means cylinder 3 to my understanding... Cylinder 2 coil plug wasn't even connected.. so i popped it on cleared the code and took it for a test drive. Its back to driving and idleing normal now.. thank god. But why was it saying 3 when it meant 2?
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Old 12-23-2013, 06:30 PM
ashleyroachclip ashleyroachclip is offline
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probably in your frustration you just read it Wrong .
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