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head gasket. manifold gasket? or something else?
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Old 02 May 2012, 10:32 AM   #1 (permalink)
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head gasket. manifold gasket? or something else?

Hello all.

Bit of a pickle on this one...

About a month ago I had my intercooler off etc piddling about, and I discovered a very very slight amount of oil in there. I thought nothing of it and thought I'd keep an eye on it.

Yesterday I went to do a quick ocd check over as I always do if I'm going on more than an hours drive, and I discovered the coolant looked very dark through the bottle.
The actual level of the fluid is smack bang in the middle of the markers. I opened it up to see the fluid has turned a dark green almost a brown along with like a thick brown silvery carbon looking sludge against the side of the bottle. Like the colour of pencil lead with the same metallic sort of sparkle.

I have no smoke from the exhaust no unusual smells, the oil on the dipstick is smack bang in the middle of the markers.. the engine had a full look over from the underside a couple of weeks back... Oil was found under the car but after a steam clean it was found to be coming from the seals on the gear box.

Although I've found no issues performance wise. I have noticed a slight increase in popping from uIe exhaust. It seems to be backfiring sooner. Before it normally only gave a bang when changing from 3rd to fourth at WOT or changing down to 3rd or 2nd .. however its been doing it inconsistently, a random big pop in A slow change up to 5th, and a huge pop from 1st to 2nd which I've never had.

I would say headgasket but then oil in the intercooler and backfiring are making me think maybe it could be intake related? What are the symptoms of intake manifold gasket failure?


before I go for the bigger problem of the headgasket, is there, any other things it could be?


Thanks for your help all.
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Old 02 May 2012, 05:47 PM   #2 (permalink)
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Re: head gasket. manifold gasket? or something else?

Update... It's gone in for a sniff and compression test to be sure.

But, weird thing is, once the bottle was opened up and the liquid in there was touched, it actually felt like liquid rubber com also smelt like it rather than oil?!
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Old 03 May 2012, 12:33 PM   #3 (permalink)
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Re: head gasket. manifold gasket? or something else?

was about to say get it looked at and sniffer done to check headgasket.

Oil in intercooler could be turbo seals, need to get it looked at by a specialist matey i think is the honest answer.
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Old 08 May 2012, 05:38 PM   #4 (permalink)
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Re: head gasket. manifold gasket? or something else?

Sniffer test was done the weekend... Exhaust gasses in the coolant.
Head gasket then.

Any ideas on why this has gone so soon? I mean I don't want to get it done only to have it reoccur? Only has 37k miles on it!
Any renowned reasons for the 2.5 wrx's blowing? My rear shocks have gone yet again but this time out of warranty. My luck is atrocious.

Also any tips on what I can do ie. Thicker gaskets or better than oem suggestions?

Just hoping its not too much of a sting. With vat... 800? More, less?

Cheers chaps
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Old 11 May 2012, 09:30 AM   #5 (permalink)
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Re: head gasket. manifold gasket? or something else?

Hi fiveskin,

I think i posted on here recently when I had the same issue.
2006 STi, same symptoms, head gasket had gone. 50k miles. It was in for the service when it was noticed.
It's a known problem with the 2.5 litre engines. The garage who repaired mine used cosworth gaskets and skimmed the heads, plus a few other bits and pieces replaced.
I tried to get the cheapest possible route to repair.
In the end I got a new clutch done at the same time as it was very worn, and the engine was already out.
I think overall the bill came close to 2k.

I've also had numerous failures of the struts. After a while I went for KYB coil overs.

I don't use the car much now and I've only done about 3k sine the heads were done - so not sure how long this fix will last.

David
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