'03 VDC 1/3/5 misfire - Page 2 - Subaru Outback - Subaru Outback Forums
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post #11 of 16 (permalink) Old 03-26-2019, 12:06 PM
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What about the cat on that bank?


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post #12 of 16 (permalink) Old 03-27-2019, 05:28 AM
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am I correct in thinking all the badly firing cilinders are on one side of the engine? maybe the cables to the coils are bad, plugs are in oil or your cams skipped a link?

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post #13 of 16 (permalink) Old 03-27-2019, 07:12 AM
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am I correct in thinking all the badly firing cilinders are on one side of the engine? maybe the cables to the coils are bad, plugs are in oil or your cams skipped a link?
here is the firing order. looking back at older threads shows the myriad of problems associated with misfires along one side of EZ30 engines. (fuel, spark,...head gaskets )


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post #14 of 16 (permalink) Old 03-27-2019, 07:14 AM Thread Starter
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Given it's all 3 cylinders I'd be looking into timing and carbon build up.

Carbon build up - how much carbon did you see inside the valve covers? I'm not sure how to further test this.

Timing - again I'm not sure how to diagnose the chain/tensioner but maybe your scanner can read the cam sensor or other appropriate signals to tell chain operation.

Make sure all your grounds are good although in my experience they run perfectly fine with multiple disconnected grounds dangling/rusted/severed.
No carbon at all. Cleanest i have ever seen.

Grounds are good. All were cleaned and tested while it was apart.

It may end up being timing. Trying to get the oxygen sensors out to pressure test the cats, someone torqued them down pretty good.

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post #15 of 16 (permalink) Old 03-27-2019, 11:27 AM
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My exhaust cam jumped a tooth and caused a 1,3,5 misfire (bank 1, passenger side, if I recall correctly). I was able to accurately diagnose it using a leakdown test. The compression test was a slight indicator, bank 1 had 140 psi avg and bank 2 had 155 psi avg (stone cold). During leakdown, I had 80% leakage out the exhaust at TDC, but only 3% about 15* past TDC (exhaust valves closing late). Luckily one tooth off on timing doesn't seem to cause a piston/valve collision event as these are interference engines. I find that it's much easier to get to the coil packs and spark plugs from underneath the car. Good luck!
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post #16 of 16 (permalink) Old 03-27-2019, 11:45 AM
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vacuum or intake manifold leak when warm????

does it stumble or miss when idling? if so, maybe selectively feeding in some propane from a handheld unlit torch around the intake mani and vacuum lines would help ?

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