1998 Mitsubishi Eclipse Blue Smoke.

SFLEMING

MEMBER
1998 MITSUBISHI ECLIPSE
4 CYL
2WD
AUTOMATIC
116,979 MILES

My car is blowing blue smoke from the exhaust occasionally when it's decelerating. I think its my valve stem seals but idk? Any message about how to change these? Also oil is coming out of my valve cover seal.

Tuesday, April 13th, 2010 AT 9:49 AM

5 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Hi sfleming,

Yes, most probably the valve seals are bad.

The normal way to replace the seals are to rremove the cylinder head and perform valve lapping and replacement of the seals.

Alternatively you can remove the rocker arms and with plugs removed, apply regulated compressed air into the cylinder to enable the valve springs to be removed without the valves dropping into the cylinders. Valve seals can be removed and replaced.

The valve cover seals can be replaced at the same time.

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Wednesday, April 21st, 2010 AT 10:08 AM

SFLEMING

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3 POSTS

Alright well every body is telling me it's not that, its my oil rings? How do I know?

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Thursday, April 29th, 2010 AT 8:09 AM

KHLOW2008

MECHANIC
41,814 POSTS

For a start, engine nowadays seldom have problem with the oil rings. The valve seals would account for at least 70 % of the smoke.

If it is a fault with the oil rings, the blue smoke would be intense mostly at high rpms.

For valve seals, the smoke would be present at cold start and would decrease. Revving the engine would increase the smoke.

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Thursday, April 29th, 2010 AT 8:19 AM

SFLEMING