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Rought idle misfire.
1997 Ford Explorer

Rought idle misfire.

(1997 Ford Explorer)
Hi, I have 97 explorer 5.0l V8 AWD, recently I get sometimes get a flashing check engine light. The car has a rough idle and struggles to accelerate. I have tried replacing the spark plugs and wires but I still get the same misfire. I have also replaced the ignition coil. It has happened twice the new spark plugs I have placed on cylinder 8 and 4 were no longer gapped when I checked them the next day. Any ideas on what else it could be. I have also noticed my oil disappearing, it does not leak on the ground but i have to top it off every 2 months or so.
What seems to make the problem better or worse? putting the car in gear and going over 20 Miles per hr
How long have you had this problem? 1 month
Tags: ford, explorer
1 answer & 1 comment
Popular Answer
on November 21, 2019

Spark plugs that were properly gapped but now have a side electrode (tip) that has been bent after installation is caused by foreign object within that particular cylinder..

This object could have been inadvertently dropped into the cylinder while spark plug was removed - - entered through the intake manifold or possibly carbon from the piston..

Video scope is most useful in these situations to see inside the suspect cylinder(s) with spark plugs removed.

Unfortunately there isn’t much else that can cause this problem - so I recommend seeking professional *hands-on* assistance to determine best plan of attack.

Good luck!

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on November 21, 2019

Additionally - this object can actually pass from the # 4 cylinder over to the # 8 cylinder, which are straight across from each other, through the lower intake manifold - I think I’ll just let your mechanic explain that detail further - - and of course - this issue WILL certainly result in a misfiring engine.


*SOMETIMES* the object can be extracted without cylinder head removal .... In any event there is SOME-THING in the cylinder that is not supposed to be there - it will have to be removed - period.

Again - GOOD LUCK!
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on November 21, 2019

Spark plugs that were properly gapped but now have a side electrode (tip) that has been bent after installation is caused by foreign object within that particular cylinder..

This object could have been inadvertently dropped into the cylinder while spark plug was removed - - entered through the intake manifold or possibly carbon from the piston..

Video scope is most useful in these situations to see inside the suspect cylinder(s) with spark plugs removed.

Unfortunately there isn’t much else that can cause this problem - so I recommend seeking professional *hands-on* assistance to determine best plan of attack.

Good luck!

Sign in to reply
on November 21, 2019

Additionally - this object can actually pass from the # 4 cylinder over to the # 8 cylinder, which are straight across from each other, through the lower intake manifold - I think I’ll just let your mechanic explain that detail further - - and of course - this issue WILL certainly result in a misfiring engine.


*SOMETIMES* the object can be extracted without cylinder head removal .... In any event there is SOME-THING in the cylinder that is not supposed to be there - it will have to be removed - period.

Again - GOOD LUCK!

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