I'm not getting a lot of work done on my car this winter. Its been so mild I keep driving it every time I open up the garage to work on it.
I'm getting oily soot on the outside of my intake runners, clearly burping out from the joiner hoses at the manifold.
Why is it there, and is it something that I need to be concerned about?
Zach
Is the engine backfiring?
You have a wire unhooked. How old are those hoses? Are they hard and not sealing?
Idk the numbers for the pressure changes that is experienced by the intake system, but it is all over the place. From idle with a good amount of vacuum to deceleration and the throttle plate closed with a larger amount of vacuum. Then there is also a reversion pulse when air is flowing back from the intake valve, under certain circumstances, toward the plenum. Just change those big hoses, or maybe clean up the soot and put some big zip ties or clamps on the hoses to see if the problem is eliminated.
It would seem that a leak in one direction would also mean the possibility of a leak in the other direction. a vacuum leak.
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