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8th Generation (1998-2002) Specific discussion of the 8th generation

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Old 05-30-2009, 02:02 PM   #1 (permalink)
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USA Opinions Wanted for Appearance of Engine Parts

I bought the 2002 Corolla at 84,000mi and now has about 103,000. Oil consumption has been fairly steady, varying between one quart every 2000 to 2500 miles.

After exhaustive research on this well known issue, I've come to the conclusion that the oil consumption on my car is within the tolerable range, provided the engine is in otherwise good condition.

Hence the reason for this post. I yanked the valve cover and spark plugs, took pictures of them, and posted them here. Please have a look at them and tell me what you think.

There's browning on the top of the head and under the valve cover, which I think is normal. There's some whitish to tanish deposits on the spark plugs, with number four (last pic) having the most. Pictures for comparison are not quite good enough for me to tell whether they have ash or if the deposits are normal. Ash may be indicative of oil consumption, which wouldn't surprise me given how much it goes through.

Valve lash is within factory tolerances on all valves and the timing chain is tight. Any opinion you can render would be appreciated.

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Old 05-30-2009, 03:09 PM   #2 (permalink)
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the deposits on the plugs do look like carbon to me. at 103k, it's about time to replace them anyways. IIRC the 1zz requires iridium plugs.

it's not uncommon to see a 1zz in 8th gen to burn oil, but make sure it's not leaking, and the PCV valve is functioning properly.
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Old 05-30-2009, 04:20 PM   #3 (permalink)
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thats just some varnish, clean it off the valve cover where its built up and try running valvoline max life synthetic or synthetic blend from now on.

those plugs are DONE! those are ash deposits, not carbon btw.
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Old 05-30-2009, 04:30 PM   #4 (permalink)
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Quote:
Originally Posted by huangxin View Post
the deposits on the plugs do look like carbon to me. at 103k, it's about time to replace them anyways. IIRC the 1zz requires iridium plugs.

it's not uncommon to see a 1zz in 8th gen to burn oil, but make sure it's not leaking, and the PCV valve is functioning properly.
It's definitely not leaking as the engine is dry as a bone. I recently replaced the PCV valve, but I got no indication from the old one that it was malfunctioning.
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