Engine Misfiring - 2000 Outback 2.5L - Subaru Outback - Subaru Outback Forums
 
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post #1 of 7 (permalink) Old 11-13-2016, 05:05 AM Thread Starter
GAM
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Engine Misfiring - 2000 Outback 2.5L

Hi All,

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.

Many Thanks

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post #2 of 7 (permalink) Old 11-13-2016, 10:53 AM
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hmmm...was gonna suggest knock sensor.

if it runs poorly under load and at speed as well, maybe fuel supply is poor due to cracked cap/ruptured o-ring on fuel pump.


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post #3 of 7 (permalink) Old 11-13-2016, 11:47 AM
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I moved the thread from the "aussie/ kiwi" section to somewhere for more people to view it.

132,000 miles = 212,000 km

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Found a Subaru Vin Decoder (also works on many manufactures):
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post #4 of 7 (permalink) Old 11-13-2016, 03:56 PM Thread Starter
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Thanks Eageleye. Hoping for some ideas.
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post #5 of 7 (permalink) Old 11-13-2016, 04:06 PM
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subarus like NGK spark plug wires and plugs. (I see you got Bosch on the plug wires = "ignition leads" )

when was the last time the timing belt and its component pulleys etc were changed?

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post #6 of 7 (permalink) Old 11-13-2016, 04:10 PM Thread Starter
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Thanks. I'll take a look at that provided I can find a suitable part here in Australia without replacing the whole unit. Just watched the video on this forum, I have done in-tank fuel filters before so pretty simple and worth trying.

Any other ideas?
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post #7 of 7 (permalink) Old 11-13-2016, 08:48 PM Thread Starter
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I put in NGK Spark plugs recently. Whilst the new Leads are Bosch, the fault remained identical between the old leads and new leads so I am working on the theory that new leads should not create an identical problem.

Timing belt and all other belts were replaced in the last 60,000km (36,000 miles). Air conditioning belt was replaced more recently as the pulley went bad and chewed it up so pulley and belt replace in the last 12 months.
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