Misfires and oil leak - Ford Truck Enthusiasts Forums



Modular V10 (6.8l)  
Sponsored by:
Sponsored by:

Misfires and oil leak

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 12-29-2017, 11:54 AM
cmayer cmayer is offline
New User
Thread Starter
 
Join Date: Apr 2016
Posts: 4
cmayer is starting off with a positive reputation.
Misfires and oil leak

Ex threw a check engine light while towing up a grade and began idling very rough.

P0304, P0305, P0309 = misfires cylinders 4, 5, 9.

Also the PVC valve and driver's side valve cover have oil on them which they didn't before, but even worse is the passenger side from the starter to the bell housing have a ton of oil on them, enough to splatter back all over the transmission, cross members, and even rear axle has splatter marks.

Figure I'll get a new COP and try swapping it with the misfiring cylinders, but any clue as to why it puked oil and could that amount of oil on the passenger side migrated from the PVC?

Originally thought it spat a plug, but they're all still in place.

Thanks!
Reply With Quote
  #2  
Old 12-29-2017, 12:07 PM
super 6.8 super 6.8 is offline
Elder User
 
Join Date: Oct 2004
Location: Southern KS
Posts: 804
super 6.8 has a good reputation on FTE.super 6.8 has a good reputation on FTE.super 6.8 has a good reputation on FTE.
Sounds like your crank case got pressurized some how. Maybe the pcv valve is stuck closed?
Reply With Quote
  #3  
Old 12-29-2017, 12:39 PM
R&T Babich R&T Babich is offline
Posting Guru
 
Join Date: Feb 2011
Location: Thousand Oaks, CA
Posts: 1,004
R&T Babich has a very good reputation on FTE.R&T Babich has a very good reputation on FTE.R&T Babich has a very good reputation on FTE.R&T Babich has a very good reputation on FTE.
Quote:
Originally Posted by cmayer View Post
... Figure I'll get a new COP and try swapping it with the misfiring cylinders, ...
With oil all over that's probably causing your misfires.
Cleaning the plug holes and boots might fix the misfiring.
A spare COP is still good to have.
Reply With Quote
  #4  
Old 01-08-2018, 10:27 AM
rock2610d's Avatar
rock2610d rock2610d is offline
Elder User
 
Join Date: Mar 2013
Location: Wyoming
Posts: 911
rock2610d has a great reputation on FTE.rock2610d has a great reputation on FTE.rock2610d has a great reputation on FTE.rock2610d has a great reputation on FTE.rock2610d has a great reputation on FTE.rock2610d has a great reputation on FTE.
Cylinder 9 is on wrong side of motor. It' on drivers side. Is there oil over there?

I think you had a PCV issue which could have blown out a valve cover gasket. But I would think the pcv would have popped out first.

I bet at least 2 plug holes have alot of oil in them. Clean it out and clean cops, put in a new oem pcv and hoses. New plug and oem Denso cop on cylinder 9.
Reply With Quote
  #5  
Old Yesterday, 05:49 PM
cmayer cmayer is offline
New User
Thread Starter
 
Join Date: Apr 2016
Posts: 4
cmayer is starting off with a positive reputation.
Quote:
Originally Posted by rock2610d View Post
Cylinder 9 is on wrong side of motor. It' on drivers side. Is there oil over there?

I think you had a PCV issue which could have blown out a valve cover gasket. But I would think the pcv would have popped out first.

I bet at least 2 plug holes have alot of oil in them. Clean it out and clean cops, put in a new oem pcv and hoses. New plug and oem Denso cop on cylinder 9.
Thanks, cleaned the oil around the PVC and found the washer around the oil pan drain plug is split and allowing a drip while sitting. I'm assuming that's the cause of the oil on the bottom of the engine.

#9 COP doesn't lock on when plugged in, so when pushed on the idle smooths out a bit. Appears to be the clip on the COP is broke, so ordered a new one and should fix that.

#'s 4 and 5 made no difference whether the COP was plugged in or not, so ordered two new ones with boots and springs.

Using the recommended Denso COPs.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Water in the oil and crankcase pressure? donerico 1973 - 1979 F-100 & Larger F-Series Trucks 15 04-06-2017 05:09 PM
Trying to identify source of oil splatter - underside near rear driver side wheel jbourne84 1968-2013 Full Size Vans 7 06-18-2016 12:28 PM
302 H.O. Swap - Need info on PCV Glaser67 Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) 4 05-18-2016 01:17 PM
Green Splatter lcsguthrie 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks 5 05-08-2016 10:07 PM
PVC and oil breather questions! jasindude1 1961 - 1966 F-100 & Larger F-Series Trucks 9 04-16-2016 05:24 AM


Go Back   Ford Truck Enthusiasts Forums >

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 05:20 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.