Join Date: Mar 2016
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Engine Misfiring - 2000 Outback 2.5L
First post here, hoping someone might be able to assist here before I blow more money chasing this problem.
Subaru Outback 2.5L 4 Cyl. It started idling rough and loses power under acceleration. I have been chasing it for a couple of months now and driving it feels like if might just blow up one day...LOL Seriously through is sounds like it is running on 3 cylinders.
Here is my testing and replacing so far (with zero change to the fault) in the order it was done :
- Coil checked for spark on all 4 cylinder - OK
- All Ignition leads fully replaced with new Bosch leads
- Noticed Oil on the Spark plug tubes. Figured it may be creating some arcing
- Replaced all the valve cover gaskets on both sides
- Replaced all 4 spark plugs
Still no joy so took it to a Mechanic. After 2 days they:
- Reconditioned all Fuel injectors
- Checked for pulse on injectors
- Ran a compression test and said it tested fine
They are at a loss and now say I need a new motor. Said it could be a "Burnt Valve" but whatever that is, wouldn't a compression test show this up?
The motor has 212,000Km. The head was fully reconditioned at 156K and all gaskets, belts have been done at that time.
In the past 10,000km, I thought the fuel usage was high so I had a code scan on the engine. It was saying Cam Shaft Position Sensor and Knock Sensor needed replacing so I have done these recently.
SO.... no change whatsoever. Mechanic still says it might be the head which I don't understand if the compression test was ok.
I asked about O2 sensor and he is adamant that this would not create this fault.
I'm over $800 in on this goose chase for a $3,800 car and now an engine is likely to be $3K fitted with no real guarantees it will be any better, so looking to see if there are any other ideas out there before I bite the bullet and replace the engine.