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Discussion Starter #1
I replaced all six spark plugs in my 2003 Pilot even though it was not running bad. I have 230k miles and plugs have not been changed in about 120k miles. After a straightforward replacement of the plugs, I am now getting consistent misfiring of cylinders #3 and #5. I put one of the old plugs back in #5 and no change in misfire. I expected the Pilot to run like a top with new plugs, but don't know what's going on. Anyone ever experience anything like this?
 

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Check the gap on the plugs .. check to see if you didn't pop an air hose by mistake ..
 

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Gap checked at .042"

Hmm Supposed to be a gap of .044.. shouldn't matter that much . Check the wire caps leading to the spark plugs re seat them if need be ..

Very odd ..should not cause a misfire after a plug swap ...
 

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Exactly! What plugs did you use? Should only use OEM which is NGK.
 

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Discussion Starter #8
Is it possible the spring on the coil pack that engages the plug got pushed back during installation and not making good contact with the plug?
 

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Discussion Starter #9
Initially after the plug change, I had misfires indicated on cylinders #3 and #5 per my OBD-II reader. I reset the codes and after driving around a short distance, the check engine late came back on and I am getting random misfires on all six cylinders. As yet I have not found any lose wires or hose that is causing this, but doesn't look like the new plugs or anything directly related to them.
 

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Did any grease with insulator properties get onto any of the metal to metal electrical contacts?
 

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What about where the coil pack mates with the top of the spark plug?
 

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I never heard of putting anti-seize on plug threads and never did that myself. Did Honda recommend doing that?
 

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Not sure if Honda recommends it but it seems to be a common practice among some automakers. From what I have read torque spec on the plugs should be reduced by roughly 1/3 if antisieze is used and the manufacturer does not recommend it. I have used antisieze on other vehicles and will use it in 6k miles when my Pilot reaches 105k miles.
 

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I never heard of putting anti-seize on plug threads and never did that myself. Did Honda recommend doing that?
Don't see why we should since we have issues with too much oil with the plugs in the first place :)
 
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