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Fry Rice Specialist
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4,794 Posts
Discussion Starter #1
the second closest spark plug thread to my driver side may have been repair before from the previous owner and that plugs always closed it's gap and the tip is white all the time. and i notice the plug wire sit way lower than the rest of the plug. the rest of the boot sits flush on top of the heads but this one sits 2mm lower into the head. is there anyway that i can use a washer from my old plug to add to it so it sits higher? or is there any shims or washer that i can use to raise the spark plug?

thanks.
 

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Refrigerator Raider Hater
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11,719 Posts
yes you can use washers, but that may only compound the problem. You should inspect the head to see why the plug sits lower first.
 

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Fry Rice Specialist
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4,794 Posts
Discussion Starter #3
how many washer i can safely stack each other? is 3 washer ok?
 

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Refrigerator Raider Hater
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11,719 Posts
Can't say, you really need to inspect the head. If threads are missing, you'll just end up blowing out the spark plug, possibly causing more damage.
 

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376 Posts
I don't see how he could use washers on a 4.6 because the spark plug has a tapered seat. There is no way that it would seal. Unless there is a special washer that I don't know about.
 

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Fry Rice Specialist
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4,794 Posts
Discussion Starter #6
good point, i will see what can i do. i'm pretty much sure the thread has been repair before and probably need some shorter spark plugs to go for it.
 

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Fry Rice Specialist
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4,794 Posts
Discussion Starter #7
check it just now for all the spark plug. normal color and all the gaps are consistents. just still can't figure out what the missed from.
 

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I had a "miss" with my T-bird and it turned out to be caused by coolant leaking from the hose that runs from the back of the engine to the heater core. Made the plug all wet and missed badly. Didn't find it till I had changed all the plugs. #4 on passenger side rear was the one.
 

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Fry Rice Specialist
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4,794 Posts
Discussion Starter #9
update on the spark missed problem.

when the car is just started, while it still in close loop operation i don't get any missed under load. the missed will only occured once the engine warmed up.

i'm thinking tps sensor or egr or the temp sending unit for the eec. car throw no codes at all. any ideas?
 

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Fry Rice Specialist
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4,794 Posts
Discussion Starter #10
another update.

the missed is gone and the culprit....a spark plug cable wasn't seat all the way down. check all this morning and i said damm...that's all it takes? good to have the instant rubber burning feeling back again.
 
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