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Old Feb 6, 2020 | 04:04 PM
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I have a 2008 base convertible, automatic. It is housed in a storage unit complex. I could not drive it for a few weeks. I would start
it every day and let it run for about 15 minutes. I would rev it up a little, not much. When I did finally took it out, there was a
patch of black soot under the car. It was , I would say , in the center and around the gearshift area.
This is the first time I would it and let it run for a long time in the unit. the floor is cement. Thank you for your help.
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Old Feb 6, 2020 | 04:24 PM
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Originally Posted by jay c smith
I have a 2008 base convertible, automatic. It is housed in a storage unit complex. I could not drive it for a few weeks. I would start
it every day and let it run for about 15 minutes. I would rev it up a little, not much. When I did finally took it out, there was a
patch of black soot under the car. It was , I would say , in the center and around the gearshift area.
This is the first time I would it and let it run for a long time in the unit. the floor is cement. Thank you for your help.
What's your question? Do you want to know what caused the soot, or do you want to know how to prevent it in the future, or do you want to know how to get rid of the soot?
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Old Feb 6, 2020 | 04:29 PM
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Thinking he wants to know where and why... o2 sensor leaking exhaust? could you have a leaky exhaust or some sort of rust (i see FL, probably not?)
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Old Feb 6, 2020 | 04:35 PM
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Originally Posted by sonnysucks
.. o2 sensor leaking exhaust?
A sensor leaking enough to leave soot on floor would likely trigger a CEL.
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Old Feb 6, 2020 | 04:37 PM
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Jay, check for any codes.
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Old Feb 6, 2020 | 04:43 PM
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Old Feb 6, 2020 | 04:45 PM
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Somewhat leaky exhaust? It happens.
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Old Feb 6, 2020 | 04:47 PM
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I would say you have an exhaust leak in that area
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Old Feb 6, 2020 | 04:49 PM
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thanks
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Old Feb 6, 2020 | 04:58 PM
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You are doing more harm than good idling that much. No need to start it every day. If you keep the battery on a maintainer no need to start it at all. Without a maintainer once every 2 weeks should be enough, let it run a little longer and get it fully warmed up and the battery charged.
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Old Feb 6, 2020 | 06:21 PM
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I'll take a wild guess that it is condensation from the exhaust dripping from one of the exhaust pipe joints, the moisture evaporates leaving a patch of black soot.
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Old Feb 7, 2020 | 11:53 PM
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Originally Posted by saplumr
Somewhat leaky exhaust? It happens.

condensation is my guess, leaking from one of the joints in the pipes.
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Old Feb 8, 2020 | 12:04 AM
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Originally Posted by Vette_DD
What's your question? Do you want to know what caused the soot, or do you want to know how to prevent it in the future, or do you want to know how to get rid of the soot?
Or how starting it up and running it like this the worst way to approach storing it for the winter?
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Old Feb 8, 2020 | 06:51 PM
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Originally Posted by BigBlok502
I'll take a wild guess that it is condensation from the exhaust dripping from one of the exhaust pipe joints, the moisture evaporates leaving a patch of black soot.
This because you don't run it enough to ever get all the condensation out of the exhaust and oil. Then by running for such a small amount you are making the amount of condensation increase, and . . .

Originally Posted by owc6
Or how starting it up and running it like this the worst way to approach storing it for the winter?
This. It would be better to just leave it sit.
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