C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Mar 28, 2005 | 02:17 PM
  #1  
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dm1948
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From: parachute co
Default exhaust

have a 89 with 50,000 miles getting smoke out the tailpipes only when it's cold when it warms up seems to be ok, took it to my mechanic
he thinks it is valve guides because i only drive it in the summer,any
thoughts need a second opionon.
can't decide whether i want to spend the money i love this car but
is this the start of bigger things???????????????????
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Old Mar 28, 2005 | 04:08 PM
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I call that "character." Honestly it could be just the valve stem seals. That's a very traditional problem with older chevrolet engines.
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Old Mar 28, 2005 | 04:25 PM
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Default Another Option

Are you sure you are not seeing vapor. In a cold climate or when it is cool and humid and you start up a car you will see steam or water vapors from the exhaust until it warms up enough to vaporize the water.

My guess is with such low milage you condense a lot of moisture in the pipes and mufflers.

Usually if you are burning oil it is blue in color and hangs in the air, but if it is moisture it is usually gray or white and disipates quickly. The other color from an exhaust is black (overrich fuel mixture).

If you are wondering if the climate is causing this to happen watch the other cars around you expecially the ones that have dew on the window as if they have just been started. I will bet you will see them doing the same thing you are.
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Old Mar 28, 2005 | 06:51 PM
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From: parachute co
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it's black in color i have black stuff all over the back of the car
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Old Mar 28, 2005 | 07:58 PM
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Default Smoke

My vote is for valve stem seals. A common problem. - Ken
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Old Mar 28, 2005 | 08:57 PM
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From: parachute co
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your right it is the valve stem seals, i was wrong
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Old Mar 28, 2005 | 09:09 PM
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Originally Posted by dm1948
it's black in color i have black stuff all over the back of the car
IMO if the exhaust is black its because its running rich during warm up. Could be dirty injectors. You might want to try some injector cleaner in the tank before you spend a lot of money trying to figure this out. I like to try the easy stuff first. If it doesn’t work you are only out the price of the injector cleaner. Hope this helps. Tim

Oil burning will produce a blue exhaust.
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Old Mar 29, 2005 | 07:25 AM
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Black is definitely over-rich mixture, not oil problem. Try getting the injectors cleaned and maybe adjust the IAC.
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Old Mar 29, 2005 | 07:37 PM
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From: parachute co
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i'm starting to think you are on to something now whenever
i start it i smell gas what does that have to do with valve seals
i'm confused
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