H6 stutter - Page 2 - Subaru Outback - Subaru Outback Forums
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post #11 of 19 (permalink) Old 03-26-2019, 10:04 AM
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Originally Posted by guntherrex View Post
Since the plugs were changed at the subaru dealership I assume they used th correct spark plugs... otherwise I'd be rather disappointed. I could ask of course

what's a MAP/MAF?

it runs on 95 octane fuel, no LPG.
Mass air flow. It's the electrical dohicky just on the engine side of the air cleaner. They make a particular spray you can buy at the parts house. Mass air flow sensor cleaner. I don't know what else can be used. MAF spray could just be marketing wank.


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post #12 of 19 (permalink) Old 03-26-2019, 10:39 AM
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other products MAY be OK, but to me, the MAF cleaner I bought smelled unique among automotive products - most like that wall stain primer KILZ I think - maybe a lacquer thinner-ish odor?


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post #13 of 19 (permalink) Old 03-27-2019, 04:48 AM Thread Starter
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you guys in the habit of sniffing cleaning agents?

I asked the mechanic, he said the sensor readings were within spec
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post #14 of 19 (permalink) Old 03-27-2019, 08:33 AM
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sometimes smelling stuff is unavoidable

sometimes it smells kinda good! lol

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post #15 of 19 (permalink) Old 03-27-2019, 10:59 AM
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In my experience the TPS can be an issue in these cars. It might be difficult to catch and I would recommend replacing as there was a defect with the original part. You might be able to check the part number of your TPS.

I used to have issues under load occasionally that I think was due to issues with the timing chain tensioners that were failing. It should also be noted that these cars should have the valves adjusted at 100k miles and valves out of adjustment could lead to misfires under certain loads. Honestly, checking and adjusting the valves its a big time consuming task and not recommend unless the heads are being pulled.

These cars do not have a MAF airflow sensor. They will not succumbed to vacuum leaks especially at 2k rpm.

If it was a fuel flow issue I would expect issues under all RPM's at heavy load.
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post #16 of 19 (permalink) Old 04-09-2019, 10:40 PM
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Yes, there was a technical service bulletin on the TPS on the 2001-2004 H6 cars. Part is not too crazy expensive, I paid around $130, if I remember correctly.


And, as the previous respondent said, these engines do not use a MAF (mass air flow) sensor, but a MAP sensor instead, which is mounted on the throttle body, and measures vacuum.

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post #17 of 19 (permalink) Old 05-15-2019, 09:43 AM Thread Starter
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ok, haven't used the outback much lately but still annoyed with this stutter. right around 2,5k rpm it disappears. The TPS was checked by the mechanic so should be ok. Any way to test the MAP sensor?
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post #18 of 19 (permalink) Old 05-15-2019, 10:32 AM
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refresh all the ground connections. I remove all I can locate, wire-brush all the surfaces on eeach side of terminals and the bolt and body, reconnect and smear with dielectreic grease.

has the alternator ever been swapped? we're sometimes given the incorrect part number when buying rebuilt alternators. Check operating voltage.

do you use high octane fuel? our owners' manuals recommend it and there is a power reduction if we use lower octane.

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post #19 of 19 (permalink) Old 05-16-2019, 09:17 AM Thread Starter
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I can check the voltage while running, the mechanic had also checked the wiring to the ignition and didn't find anything.

Any way to check the MAP sensor?
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