h6 3.6 misfiring part throttle

Posts specific to the 3.0 litre NA H6 engine

h6 3.6 misfiring part throttle

Postby skyva » Sun Sep 06, 2020 12:07 am

Hi, my 3.6 outback 2010 has just passed 250,000km, I have owned it since new, serviced regularly except for last 9 months as I live in Melbourne and it is difficult. It blew a fuel pump around 6-9 months ago but otherwise pretty faultless.

Recently i have been getting a misfire at around 1800rpm at part throttle, kind of when you just want to accelerate a little. The car senses it and drops a gear. Hard throttle is no problem, no missing and doesn't seem down on power. Starts fine.

Any ideas? It is probably overdue for new plugs. I had them done at the dealer whenever they were due, probably at around 100k, and I believe they put in platinum one. Not sure. Is it likely plugs or are there other common issues with the 3.6l.

I am tempted to try to do it myself but last time I saw the subaru guy do it he was half inside the engine bay and it looked difficult.
Thanks.
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Re: h6 3.6 misfiring part throttle

Postby bigBADbenny » Sun Sep 06, 2020 7:24 am

Get a pro to do it, not a dealership but a Subaru specialist.
Its a pain on an h4 let alone an h6.

I’d get the car logged to see which cylinder is misfiring.

The fault can be spark plugs, coilpack and plug/loom issues, inlet leaks, even avcs.

Even the gearbox is a potential source.

Basically get the car health checked, scanned for codes and or logged so you’re not just firing a parts cannon at it.
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Re: h6 3.6 misfiring part throttle

Postby bigBADbenny » Tue Sep 29, 2020 6:25 pm

Plus it’s definitely around those k’s that all the inlet side gaskets, seals and orings start crapping out, causing inlet tract and crank case leaks.

These can be identified with a UV dye and torch kit via eg Ebay, plus <1psi inlet pressure testing with smoke and or bubbles.
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