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Guest Message by DevFuse
 

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Curses, another valve bites the dust!


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6 replies to this topic

#1 WoodsWagon

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Posted 25 January 2007 - 12:05 AM

And I wasn't even beating on it this time! Same cyl as last time, new head. Same symptoms, has spark, smells like gas when turned over with the plug out. Pisht noise in exhaust, hardly any compression.

Can oil burning cause valves to burn?
the only other thing I can think of is if my injector is bad and running that cyl lean all the time. Might explain the rash of problems #3 has that none of the others do.

I've unpluged the injector to try and save the cat (or what's left of it) and gas, and I'm going to run it like this untill I put the 2.5 in. What's sad is that the EJ22 0n 3 cyls is pretty comparable to the EA82 ever was on 4.

#2 nipper

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Posted 25 January 2007 - 01:16 AM

too lean will do that.


nipper

#3 WoodsWagon

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Posted 25 January 2007 - 10:16 PM

Would a lean condition be offsett by the oil getting sucked in? I would think that the oil would help cool things down.

I couldn't tell by the plug if it was running lean, because it always had oil crustys on it.

25psi at cranking speed.

#4 hankosolder2

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Posted 25 January 2007 - 11:23 PM

[quote name='91Loyale']And I wasn't even beating on it this time! Same cyl as last time, new head. Same symptoms, has spark, smells like gas when turned over with the plug out. Pisht noise in exhaust, hardly any compression.

Can oil burning cause valves to burn?
the only other thing I can think of is if my injector is bad and running that cyl lean all the time. Might explain the rash of problems #3 has that none of the others do.

This is a hydraulic lash-adjuster earlier EJ22, right? Because, if it wasn't, tight valve clearance can cause burned valves. A local vacuum leak could do that too...like, say, the O-ring around the injector... sorry that you're having such bad luck...


Nathan

#5 nipper

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Posted 25 January 2007 - 11:33 PM

http://www.aa1car.co...rary/ar1192.htm

that will answer it.


nipper

#6 WoodsWagon

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Posted 26 January 2007 - 01:05 AM

According to the link (thanks BTW) the main causes for burned valves other than mechanical issues are coolant problems, lean mix or clogged exhaust. The head was a good hydro head, so no mech problems. The cooling system is clean and functional, so unlikely to be the problem. Clogged exhaust... well, it doesn't really pull over 6k rpms and i think it's probably because of the exhaust. It doesn't spend that much time up there though... and wouldn't that affect all the cyls, not just #3?

That leaves it down to lean mix. It's not a vacuum leak, so it must be a bum injector. Sucks to have 2 heads and a freshly rebuilt block toasted by a friggin injector.

#7 WoodsWagon

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Posted 04 February 2007 - 10:16 PM

It's not just my car. The engine we swapped out of Konrad/soo's car this summer was running on 3cyls. Took the left head off, and it had a burned exhaust valve exactly like mine did. #1 cyl, big carbon deposits, burning lots of oil, lower section of valve face burned off. Other cyl's look fine.

So that's 3 exhaust valve smoked through on EJ22's.

Anyone else heard of this happening on an EJ22?




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