Anyone know what the sound is when I shut off my '89 3.9L Dakota. It
sounds like a servo or something that is closing a valve... After the
engine stops there is a mechanical buzzing sound and it ends in a thump.
I'm guessing here, since I can't look under the hood when I shut off
the ignition.
Is it the valve like thing on the exhaust manifold?
Also, what is that for? There's a rotating part in the manifold
collector that seems to be a valve of some kind. Is that possibly what
gets activated when the computer senses over revving? I'm guessing here
again...
Matt Schroeder
'89 Dakota Sport 3.9L
1996 Jeep Grand Cherokee
1986 Dodge D150 318 with Streetfighter tranny & conv.
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