some exhaust smoking - decarb cylinder/valves?
05-05-2008, 10:47 PM
#3
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Join Date: Feb 2006
Location: Phoenix, Az
Posts: 16
Car Info: 1996 impreza 2.2L
like cleaning up deposits of carb on your valves, my exaust smokes a little and a friend told me that it could be carb build up on valves/ bad valves or oil gettin past piston ring
05-06-2008, 06:02 AM
#4
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Join Date: Dec 2002
Location: Sacramento CA
Posts: 10,029
Car Info: 02 Impreza WRX sedan
Carbon buildup? How many miles do you have on the engine? Is the smoke black (raw fuel, you'd be able to smell it), bluish (oil smoke), or white (steam, likely coolant)?
I would try a fuel system cleaner like Chevron Techron. If I really thought there might be a problem with the engine, I'd let a good shop perform a leakdown test on the engine to pinpoint the source of the smoking.
I would try a fuel system cleaner like Chevron Techron. If I really thought there might be a problem with the engine, I'd let a good shop perform a leakdown test on the engine to pinpoint the source of the smoking.
05-07-2008, 05:20 AM
#5
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Join Date: Feb 2006
Location: Phoenix, Az
Posts: 16
Car Info: 1996 impreza 2.2L
the smoke apears to be more towards bluish/white ill try the fuel system cleaner first then more likely ill head to a forced air tech to let them diagnos it. ive also read an article a while back i dont recall the forum but it said something about buying a product that is pour on the intercooler while the suby is on and it will clean the valves aswell
05-07-2008, 07:03 AM
#6
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Join Date: Mar 2006
Location: san jose, HELLA cali
Posts: 2,349
Car Info: 20psi Daily!
sea foam. used to use it on my honda. but for subies, im not too sure. i remember reading threads about why its bad for boosted cars, but search for threads on sea foam
05-24-2008, 07:13 PM
#7
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Join Date: Jul 2006
Location: Allentown,PA
Posts: 1,069
Car Info: 04 WRX
Carbon buildup? How many miles do you have on the engine? Is the smoke black (raw fuel, you'd be able to smell it), bluish (oil smoke), or white (steam, likely coolant)?
I would try a fuel system cleaner like Chevron Techron. If I really thought there might be a problem with the engine, I'd let a good shop perform a leakdown test on the engine to pinpoint the source of the smoking.
I would try a fuel system cleaner like Chevron Techron. If I really thought there might be a problem with the engine, I'd let a good shop perform a leakdown test on the engine to pinpoint the source of the smoking.
The Chevron with Techron fuel system cleaner is one of the
best fuel system cleaners on the market and actually cleans
pretty well for just an additive you pour in your gasoline tank.
Also you can remove all of your fuel injectors and clean them
by hand.If you find a bad fuel injector just replace it.This would
be great time to install brand new injector o-rings too.
A really smart Subaru technician told me to never use Seafoam
in any Subaru.Seafoam will foul your spark plugs too.If you did use
Seafoam plan on replacing your spark plugs and fuel filter!
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