Changed Valve Cover seals, Spark Plugs and Coil Pack.. wet again.. - Lexus IS Forum
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post #1 of 5 (permalink) Old 03-31-2019, 07:17 PM Thread Starter
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Changed Valve Cover seals, Spark Plugs and Coil Pack.. wet again..

Hey all,

First post here, but had a quick question. In October I replaced my spark plugs, coil packs, and Valve Cover Gaskets. Car's been running fine, but did an oil change, and it started miss-firing. Pulling a p0305 code, so I went and took everything a part, and sure enough all plugs are wet again. A mechanic friend told me I had should have also replaced the "plug hole seals" but, I'm not entirely sure that's relevant with this car. Unless there is something I'm missing. Any help would be appreciated. I went through the search function, but I'm mainly seeing valve cover seals as the resolution.
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post #2 of 5 (permalink) Old 03-31-2019, 07:37 PM
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Originally Posted by kream View Post
Hey all,

First post here, but had a quick question. In October I replaced my spark plugs, coil packs, and Valve Cover Gaskets. Car's been running fine, but did an oil change, and it started miss-firing. Pulling a p0305 code, so I went and took everything a part, and sure enough all plugs are wet again. A mechanic friend told me I had should have also replaced the "plug hole seals" but, I'm not entirely sure that's relevant with this car. Unless there is something I'm missing. Any help would be appreciated. I went through the search function, but I'm mainly seeing valve cover seals as the resolution.
I would say bad gasket install. The only other time I have seen an issue. Would be crank case pressure getting to high. Basically the PCV was not working right.

Careful & Consistent
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post #3 of 5 (permalink) Old 03-31-2019, 09:23 PM
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when you installed the seals, you put the gasket sealer on the corners at the cam seals?
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post #4 of 5 (permalink) Old 03-31-2019, 10:50 PM Thread Starter
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when you installed the seals, you put the gasket sealer on the corners at the cam seals?
You know what... now that you mention that, I don’t think I did. Looks like I know what I’m doing tomorrow.
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post #5 of 5 (permalink) Old 04-09-2019, 10:42 AM
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Use only OEM toyota seals.

A dab of silicone on the corners

Mating surfaces cleaned and free of oil

02 Onyx Black 5 spd rhd w/13B rotary turbo
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