Random Multiple Cylinder Misfire - Not Festiva

[sketchman]

I really don't know why nothing I touch ever goes smooth.

00 Honda CRV 2.0

Came in for a burnt exhaust valve. I changed them all and ground them in. Changed the seals too. Most annoying seal design to get off I've ever seen, BTW.

Now it idles rough and is misfiring heavily on #3 AND on every cylinder randomly. But then you rev it and it sounds fine. Strong and smooth. Drop back to idle and it goes ape fleas again. Can't hold steady and misfires.

I've done the following, nothing of which has done anything to stop it.

1. Swap plug wires, plugs, injector wires, injectors.
2. Check comp for giggles. It is fine.
3. Changed plugs for giggles. No change.
4. Adjusted valve lash. No change.
5. Checked rotor and button. Looked brand new.

It's insane. Everything I can physically check seems fine, but something obviously isn't. Any ideas?

[Flyin4stroke]

Did you check the timing? Sounds like it's firing at the wrong time.

[sketchman]

Ignition? No, and that's a good point. I assumed the dizzy was keyed like a Festiva's, but I didn't actually check it.

I'll have a look.

EDIT: Oh, and the reason I didn't check that was because I just put it back the way it was. But I guess it could be off still.

[gorgonheimer]

Check valve timing again. Make sure marks are dead on. Sounds like its a tooth off.

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[sketchman]

Valve timing is annoying with this. It's a DOHC that rotates CC. There are "Up" marks on the cam gears, and a pointer on the crank gear. Then there are side marks on the cam gears that are supposed to point at each other. Gotta pull the valve cover, belts, etc to do it, but I'll check to see if it needs it.

[sketchman]

Checked valve and ignition timing. Both are correct, and now it's running so rough I can't even manipulate the idle with the idle screw. AND now it's smoking constantly.

Yep, time to start selling drugs.

[gorgonheimer]

Those only mask the pain...

Have you done compression/leakdown test? Running compression test?

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[sketchman]

I did many static comp tests. Probably 3 now. Leakdown, no. I assume a running comp test is when you let it run on 3 cyls and test one at a time?

[gorgonheimer]

Yesr, and compare readings.

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[jason_]

Vacuum leak? Does it have an intake without coolant through it? I had a Ford miss and lope, ended up being collapsed o rings at each port throat. Obviously if there's a leak after all ecm measuring is done, it'll never know to compensate.

Might be why it smoked a valve, lean and hot. And now you just upset it to show itself.

Or it ran so shittybefore it was hard to determine anyways.
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[sketchman]

I've checked a lot for leaks, but that's still possible I guess.

Just did the running comp. Worst cyl is 40psi lower than plain comp test. Best is 10psi below.

Should mention I also already adjusted the valve lash. That didn't do anything either.

[gorgonheimer]

Look into the intake valve on that cyl that is low

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[sketchman]

You thinking it's blocked or not seating? I can't really look in it without pulling the IM off.

[gorgonheimer]

I think its to tight keeping it slightly open.

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[sketchman]

Ahh, that I can check.