Coronangel

Hey everyone, so I have a problem. I took my car to a shop for them to figure out the battle with finding a misfire issue= misfire codes are
Po300
Po301
Po302
Po303
Po304
The Issue with the misfire is it only happens at idle.
They did a compression test and they told me I had good compression with about 200 in each cylinder
They did two leakdown tests, the first time they did it, leak down was good. The second time they did it; leak down was
cylinder 1--- 4-5%
cylinder 2---15%
cylinder 3---25%
cylinder 4---4-5%
So he told me I had bent exhaust valves in cylinder 3, that sometimes the valve seats and sometimes it doesnt, hence why he did two cylinder leak down tests

My question here is that could I really have good compression, but bad cylinder leak down test. could this really be happening.

If he was to do it, and I replaced all valves, retainers, timing chain tensioner, resurface and etc; It would cost me 3000 dollars

Is it worth it for me to do that, Would it be better to just buy a used or new head/top end. or even a engine
Is there another route I could go? for more power or etc? any opportunity to be made from this?

Car Analogy

Yes, its possible to have leakdown and still have good compression.

If he does all, your head will be ruined. He doesn't know how to work on our motors. You don't want to resurface the head. If you use aftermarket valvetrain parts, it will never last. If you don't install the Honda valve guides properly, you will have problems.

I wouldn't be surprised if all you needed was new exhaust valves and lapping them in.

Car Analogy

Is this a dbw car, 06+?

Does it use much oil between oil changes?

When was the last time you had a valve adjustment?

Who did that valve adjustment?

Coronangel

sorry forgot to mention
2005 honda s2000

barely burns any oil

valve lash was done 5000 miles

I did it myself. Mechanic told me they were fine.
The shop I went to is RCN motors.

Billman250

Do not mill the head under any circumstances, no matter what they say.

The usual line is "we milled it to be sure it's flat"

I guarantee you 100% the head does not need milling, and if it is milled it will result in instant chain geometry problems.

The book calls for some head milling limit around .008 or .010 or something. The problem is the book does not take into account the current chain geometry, putting the max head mill at about .0015 ( that's one and a half thousandths)

Coronangel

RCNMotors was a recommendation from other members of s2ki for the Chicago land area.