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Old 11-24-2012, 09:37 PM   #1
urbannerdmario
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Default Smokey Downpipe

Took my 2005 WRX with 130k miles to the canyons today to cruise around, Im not too experienced of a driver in that situation so I wasnt pushing my car too hard.

Got to the top of the canyon about 20 miles and I realized there was smoke coming from my engine bay so I popped the hood and noticed there was smoke coming from the bottom of thedownpipe, not really near the turbo.

Let the car sit for a while and then decided to come back down,
got to the bottom of the canyon and pulled over and there was no smoke.
Drove home about 10 miles and still no smoke when I got home. This is the first time Ive noticed this happening.

My car does have a CEL P0420 for a bad cat, so Im assuming that its just the downpipe going out? Theres never any smoke from the exhaust itself unless I just started the car and its cold outside.

Also the turbo was recently replaced about 2 months ago, right before I bought the car, but Im not 100% sure of the quality of work from whomever swapped the turbo.

Any ideas of what can be going on?
Thanks
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Old 11-24-2012, 10:54 PM   #2
mod maniac
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The ac drain dripping on the downpipe?
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Old 11-24-2012, 11:14 PM   #3
djdalaney
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Downpipes don't "go bad". A "bad cat" normally means it is clogged, which could easily cause it to over heat and smoke. If you know you have a bad cat, why wouldn't that be your first suspicion?
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Old 11-24-2012, 11:22 PM   #4
JUICEB0X
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Sometimes oil lands on my downpipe. I heard it happens also when the cv boots start leaking, they can fling grease on to the DP. Or you may have an exhaust leak where the downpipe meets the catback.


No, your downpipe isn't going bad.



Actually, nevermind everything I said before...

What I meant to say was, your downpipe is bad, so you may as well give it to me.
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Old 11-24-2012, 11:34 PM   #5
Blktrax
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Quote:
Originally Posted by JUICEB0X View Post
I heard it happens also when the cv boots start leaking, they can fling grease on to the DP.

This +1

Likely your inner CV axle boot as started to tear or is torn open and the grease is all over the DP, otherwise it the turbo oil return or the valve cover gasket, but my money is on the CV boot.
If you dont drive on it too long you can replace just the boot and not the whole axle.
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Old 11-26-2012, 01:49 PM   #6
m0nkey
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Quote:
Originally Posted by Blktrax View Post
This +1

Likely your inner CV axle boot as started to tear or is torn open and the grease is all over the DP, otherwise it the turbo oil return or the valve cover gasket, but my money is on the CV boot.
If you dont drive on it too long you can replace just the boot and not the whole axle.
+1 to cv boot, also check to see if you are leaking coolant on to
Of the heads.
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Old 11-26-2012, 01:57 PM   #7
urbannerdmario
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Would i be able to tell by just inspecting the CV Boot to see if there is a hole or tear in it?
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Old 11-27-2012, 02:47 AM   #8
575rider
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Yes, you will see the grease splatter on the underside of the car. It will be the passenger side inner cv boot, the heat from the dp dries it out and makes it crack. Mines done the same thing for a little while.
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Old 11-27-2012, 12:06 PM   #9
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Quote:
Originally Posted by 575rider View Post
Yes, you will see the grease splatter on the underside of the car. It will be the passenger side inner cv boot, the heat from the dp dries it out and makes it crack. Mines done the same thing for a little while.
Funny cause I ran one for like 4000 miles and that grease lasts forever even when the boot blows.
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Old 11-27-2012, 12:25 PM   #10
urbannerdmario
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Funny cause I ran one for like 4000 miles and that grease lasts forever even when the boot blows.
and you were still able to just replace the boot or you had to do the whole axle too?
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Old 11-27-2012, 05:44 PM   #11
urbannerdmario
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Took it to my buddies shop so he could take a look at the CV Boot, it seemed fine but there was oil dripping from the turbo area.

From what I am lead to believe, the guy that swapped the turbo out before I bought the car may have not changed the proper gaskets, but my coworker who used to be a mechanic said by looking at a oil spot on the turbo housing area that it should be the turbo oil return line.

Anyone have experience working on that return line? I really dont want to pay a shop to fix a small hose, and I was thinking id try to do it myself when I attempt to swap out the downpipe
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Old 11-27-2012, 06:33 PM   #12
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Quote:
Originally Posted by urbannerdmario View Post
and you were still able to just replace the boot or you had to do the whole axle too?
You can replace the boot, but it's a decent amount of work compared to just getting a new axle. When my inner boot went last year I had the dealer fix the boot rather than replace the axle. When a friend of mine with a more tools and his own garage had the same thing happen he decided to replace the outer boot as well and that was a terrible idea.
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Old 11-27-2012, 06:39 PM   #13
urbannerdmario
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Quote:
Originally Posted by Yotsuya View Post
You can replace the boot, but it's a decent amount of work compared to just getting a new axle. When my inner boot went last year I had the dealer fix the boot rather than replace the axle. When a friend of mine with a more tools and his own garage had the same thing happen he decided to replace the outer boot as well and that was a terrible idea.
well luckily thats not my situation haha
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Old 11-28-2012, 12:39 PM   #14
urbannerdmario
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tried to search for some tutorial or something thatll show me what i need to do to replace that line but i had no luck, anyone know where i can find something like that?
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Old 11-29-2012, 04:11 PM   #15
urbannerdmario
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anyone? need some advice because i will be attempting this during the weekend
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Old 12-04-2012, 06:06 PM   #16
sackytar
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Quote:
Originally Posted by urbannerdmario View Post

and you were still able to just replace the boot or you had to do the whole axle too?
I replaced it with another oem, but dealerships carry boots cheap.
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