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Why rear spark plug when changing is covered in oil and car…

Customer Question
Why rear spark plug when...
Why rear spark plug when changing is covered in oil and car has a misfire to it maybe do to the spark plug
Submitted: 2 years ago.Category: Mercury
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Answered in 18 minutes by:
2/18/2016
Mercury Mechanic: Andrew Martin,
 replied 2 years ago
Andrew Martin
Category: Mercury
Satisfied Customers: 505
Experience: Technician at Wile Hyundai
Verified

Hello, so when you changed the spark plug you found one covered in oil, and you are having trouble with a misfire?

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Customer reply replied 2 years ago
That's correct the passenger one in the rear
Mercury Mechanic: Andrew Martin,
 replied 2 years ago

Ok well the short answer is yes that could cause a misfire. But the real issue is why is there oil on the spark plug. Have you replaced anything else to try to fix the misfire?

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Customer reply replied 2 years ago
No I haven't that's basically The question I wanna know is why is the oil on there what's the cause of it
Mercury Mechanic: Andrew Martin,
 replied 2 years ago

Oh ok, its either the oil rings on the pistons are going bad and not holding oil below the compression chamber, or there is an oil leak from the head gasket into the cylinder. To find out which you'll need to perform a leak down test with a leak down tester.

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Customer reply replied 2 years ago
I believe its something dealing with the o rings or valve cover gaskets but do the motor have to be removed to fix
Mercury Mechanic: Andrew Martin,
 replied 2 years ago

Well the spark plugs go directly into the cylinder head, and they do not go through the valve cover. Was the oil on the top of them or on the threaded end?

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Mercury Mechanic: Andrew Martin,
 replied 2 years ago

If it is just a valve cover leaking into the spark plug hole then no the engine will not have to be removed

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Customer reply replied 2 years ago
It was on top and I smelled a burnt smell
Mercury Mechanic: Andrew Martin,
 replied 2 years ago

Oh ok, well yes then it is probably the valve covers leaking.

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Mercury Mechanic: Andrew Martin,
 replied 2 years ago

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