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Well, I thought I'd join the cool club and buy a Subaroo, little did I know I bought this instead. . . pleased to say it's all better now, but this is what Nick (555BCTurbo) and I had to deal with.

Gangster first post, Laura!!

Look on the bright side. Your boyfriend can take care of all this stuff!

That's not the fist time I've seen an Ej22 head with that problem.

The car ran remarkably well for only firing on 3 holes

GLCraigGT wrote:That's not the fist time I've seen an Ej22 head with that problem.

Does this mean you also know what can cause it?

I thought this thread was going to be a spam ad for a porn site.

Splinter wrote:I thought this thread was going to be a spam ad for a porn site.

Thought?? Or hoped?

Gary

Hoped, for sure.

But the SN is never as obvious as "Laura"

It's usually "dirtyshoe" or something stupid like that

All_talk wrote:

Splinter wrote:I thought this thread was going to be a spam ad for a porn site.

Thought?? Or hoped?

Gary

A little of both

Same happened to mine. Did over 85 on the highway like that, too.

Ok I'm a bit of a noob when it comes to the inside of engines. The one one the right definitely looks different from the left one. What exactly is going on in that picture? Carbon buildup?

The big chunk missing out of the exhaust valve

Oh that's what that is. All the valves look a little funky on that side. What would cause that?

detonation?

What are common symptoms of this problem?

BSOD2600 wrote:What are common symptoms of this problem?

engine knock

Knock and detonation are technically different. Detonation is a rapid wave from one source, knock has multiple sources. But anyway, yeah.

Well, if you're getting knock and you still push it, wouldn't you get detonation?

is that cyl # 3, last in line for the stock serial fuel delivery? If so I believe that's what my exhaust valves are starting to look like (in both the 92 and the 94 - havent comp tested the 91 yet)

Welcome to the board Laura.

In my case my knock sensor was bad when I removed the engine and since I don't believe in coincidences and my car seemed to be a ringer even on its cheap gas, I suspect a build up of carbon (increased compression ratio) over nearly 1/4 million miles unchecked by the knock sensor did it in. Ran the balls (hard acceleration to redline in the first three gears onto the highway) until the exhaust started making a funny sound off the guardrail. Started to run rough a few miles later. Since it was using oil like mad for several days prior, I think it had burnt a little, but then the cracked or slightly melted part formed a hot spot which completed the destruction of the valve. Mine was cylinder #3.

wiscon_mark wrote:Well, if you're getting knock and you still push it, wouldn't you get detonation?

If you're getting knock you're pretty much getting detonation. Pushing it will make it worse.

same thing with my BD. i bought it like that and drove it home 600 miles.

AWD_addict wrote:Knock and detonation are technically different. Detonation is a rapid wave from one source, knock has multiple sources. But anyway, yeah.

Sorry to steal your thunder but Detonation is one flame front from the spark plug smashing into another flame front from an unwanted ignition point somewhere in the cylinder, like a hot spot, and "knock" utherwise known as preignition is unwanted cumbustion before the spark fires

No thunder stolen, you're right.

I wrote that post poorly, it's misleading about detonation.
Thanks for the correction.

Do you agree that knock is from multiple sources in the end-gases?

subytech wrote:preignition is unwanted cumbustion

*giggle* You spelled it wrong! But I bet it feels so right!