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Old 05-15-2008, 08:36 PM   #1
FQ_22b
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Default Is my turbo blown? ...or something worse?

My car blows smoke ONLY when i let off the gas and then get back on it.

Thought it might be the head gasket but i checked the oil and it's fine.

Any thoughts? (besides me being a newb)



The car is a 01 RS with a 04 WRX engine if that means anything...
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Old 05-16-2008, 01:01 AM   #2
SurfWagon
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Smoke on engine breaking is usually a sign of ring problems. The vacuum accelerates blow-by. My suggestion is do a compression check. Hey, at least there are only 4 cylinders to check!
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Old 05-16-2008, 01:44 AM   #3
ccook
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Default I'm doubting it's a turbo

From experience, I've had a blown turbo and you'd feel significant degradation in acceleration and overall performance. Sounds like an engine problem....

I also had a blown gasket on an aftermarket up pipe and it hesitated and backfired badly. No smoke though. Prior to that my turbo (TD04) did blow and still no smoke, just a bad noise and poor power.

I think it might be necessary to have someone look at the engine, do a leak down, etc.
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Old 05-16-2008, 03:29 AM   #4
FQ_22b
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So basiclly i'm going to have to replace a piston?
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Old 05-16-2008, 03:56 AM   #5
austinramage
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Well do a compression test before you start thinking you have to replace parts, but that does sound like possibly a blown piston or ring(s).

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Old 05-16-2008, 04:05 AM   #6
FQ_22b
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Well, that's not too bad of thing. Just gives me an excuse to finally build my spare STi RA block that's been doing nothing but collecting dust.

Compression check coming soon!

More details later!
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Old 05-16-2008, 12:55 PM   #7
samb
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The smoke is blue yes?
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Old 05-16-2008, 05:10 PM   #8
FQ_22b
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yeah, it was blue. I changed my oil though and now it hasn't been smoking. I had really thin oil in it before and i switched back to 1030.

I still haven't done the compression check yet though.

Could it just have been me using too thin of an oil so it was getting past the seals?
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Old 05-16-2008, 08:49 PM   #9
notsosimple
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Quote:
Originally Posted by FQ_22b View Post
yeah, it was blue. I changed my oil though and now it hasn't been smoking. I had really thin oil in it before and i switched back to 1030.

I still haven't done the compression check yet though.

Could it just have been me using too thin of an oil so it was getting past the seals?
Did you by chance 'accidently' put conventional instead of synthetic, or vice versa?
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Old 05-16-2008, 10:38 PM   #10
GeneralTJI
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Quote:
switched back to 1030
Just in case... not saying this is the case because I don't want to assume... but-

If you were talking about running a thin oil as in 5w30, and then you went to 10w30 and are considering it thicker, I just wanted to give you the heads up that 10w30 is only thicker while the oil is cold.. which is harder on your motor during cold starts... and once the oil reaches operating temp, they are the same... what kind of oil are you running BTW??
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Old 05-16-2008, 11:37 PM   #11
FQ_22b
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I don't think conventional oil was put in. I honestly don't even remember what we put in. My friend had a case of it in his garage and i was short on cash so instead of having my oil changed by a professional(which i normally do because changing oil sucks and i'm lazy) i just let him change it.

I normally run Mobil 1, which is what is in there now.
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Old 05-17-2008, 06:51 AM   #12
Lexington
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Quote:
Originally Posted by FQ_22b View Post
So basiclly i'm going to have to replace a piston?
"basically" is not the word you're looking for.

There is nothing "basic" about engine damage.

Ever.
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Old 05-17-2008, 03:52 PM   #13
FQ_22b
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I realize that. haha.

That's also why i happened to have a spare EJ20k block laying around.

Now i have good reason to "build" my engine.
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