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Old 01-08-2013, 11:28 AM   #1 (permalink)
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Default 2008 OB engine unicorns

2008 subaru OB 2.5 5 spd manual w/ 48k miles.

yesterday my wife reported something she described as a "hickup" or "engine bump", while maintaining vehicle speed. So lower RPMS 2-3k range without a lot of throttle. It happened several times on her drive. The engine was warm too. I did not ask her hour fast she was going but I beleive it was slower speeds since it was snowing hard in Boise and the roads were a mess.

it sounds like an engine misfire to me but there is no check engine light on.


On another note over the past year or so, on a very rare occation, when coming to a stop using the brake and the clutch depressed, I have noticed that the engine speed dropping reallly low, well bellow idle but it picks back up pretty quickly and goes to idle.


any ideas? i think i still have the power traIn warrenty on it....
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Old 01-08-2013, 11:32 AM   #2 (permalink)
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Sounds like ignition coils,check for carbon cracks.
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Old 01-08-2013, 11:39 AM   #3 (permalink)
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might try a scanner to see if there is a 'pending' code. freezFrame data might pick up on some odd fuel trim issue.

but , 'tune-up' type stuff might be a good idea - check the plugs, new plug wires, seafoam throttle body and half can/can in the tank, PCV valve.
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Old 01-09-2013, 12:28 PM   #4 (permalink)
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I have exactly both problems. The engine dipping happens for a couple of days after I unplug the battery. The engine stuttering seems to happen more when it's wet outside. Very interested if you find a solution.

I plugged my car into my laptop and ran FreeSSM. Using the Factory Service manual for an '09 (Mine is an '06), nothing jumped out at me. A couple of values seemed to be a little over or under, but nothing alarming. My main concern is that my AF Learning isn't 0% at idle like the manual states it should be.
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Old 01-09-2013, 12:41 PM   #5 (permalink)
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Quote:
Originally Posted by st3mpy View Post
I have exactly both problems. The engine dipping happens for a couple of days after I unplug the battery. The engine stuttering seems to happen more when it's wet outside. Very interested if you find a solution.

I plugged my car into my laptop and ran FreeSSM. Using the Factory Service manual for an '09 (Mine is an '06), nothing jumped out at me. A couple of values seemed to be a little over or under, but nothing alarming. My main concern is that my AF Learning isn't 0% at idle like the manual states it should be.
that freessm looks BA. I'll have to get it going! I'd be interested to find out more about your setup.
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Old 01-09-2013, 12:43 PM   #6 (permalink)
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Quote:
Originally Posted by st3mpy View Post
The engine stuttering seems to happen more when it's wet outside.
isn't this often a high voltage problem? plug wires or coil?

shadow100 might have got it right. Sometimes a mister bottle of water sprayed at the idling engine at night will show arcing near a bad wire or coil.
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Old 01-09-2013, 03:38 PM   #7 (permalink)
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++ 1 Lucky Texan. First culprit: coil, due to symptoms.
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Old 01-11-2013, 06:55 PM   #8 (permalink)
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I didn't notice, 2.5i or XT?
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