07EddyB
Explorer Addict
- Joined
- November 18, 2011
- Messages
- 1,059
- Reaction score
- 285
- City, State
- Bowling Green, KY
- Year, Model & Trim Level
- 2007 Ford Explorer 4.6 V8
I've never seen this before so for the record:
Yesterday the oldest kid comes home from school in my Ex and says the check engine light is on. OK - I hook the scanner to it and it's a bad misfire on #4. No biggie - probably a coil - only one has been replaced in 135K miles so it's about that time. I did have a spare coil - so I put that one in and no difference - still misfires on #4.
OK - the plugs only have 17K on them so it's still probably the coil - the spare one I have might be bad also - it was changed under questionable circumstances.
Fast forward to today - finish work about noon and I switch coils - #2 to #4 and #4 to #2.
Still logging misfires on #4. OK - as much as I hate to pull a plug on this engine it shouldn't be a problem since they have only been in there for 17K miles.
Pulled plug - no obvious issues - go buy new plug - install.
No misfires - very smooth.
I've never had a plug fail in this way. Since I bought the plugs off of Amazon I'm wondering if I got at least one counterfeit plug of the eight - maybe I got more than one. Only time will tell but a plug can apparently fail at only 17K.
Yesterday the oldest kid comes home from school in my Ex and says the check engine light is on. OK - I hook the scanner to it and it's a bad misfire on #4. No biggie - probably a coil - only one has been replaced in 135K miles so it's about that time. I did have a spare coil - so I put that one in and no difference - still misfires on #4.
OK - the plugs only have 17K on them so it's still probably the coil - the spare one I have might be bad also - it was changed under questionable circumstances.
Fast forward to today - finish work about noon and I switch coils - #2 to #4 and #4 to #2.
Still logging misfires on #4. OK - as much as I hate to pull a plug on this engine it shouldn't be a problem since they have only been in there for 17K miles.
Pulled plug - no obvious issues - go buy new plug - install.
No misfires - very smooth.
I've never had a plug fail in this way. Since I bought the plugs off of Amazon I'm wondering if I got at least one counterfeit plug of the eight - maybe I got more than one. Only time will tell but a plug can apparently fail at only 17K.