Quote:
Originally Posted by dsvw
My 1986 190D stays on for about 4 seconds after I turn the engine off.
Any ideas?
Thanks!
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You most likely have a low level leak from one or more rubber connecters somewhere in the vacuum circuit.
The ones in the engine bay tend to fail first.
The connectors should really grip the hard vacuum lines tightly, and be difficult to remove.
If they are loose, replace them.
Isolate the shutdown circuit by plugging off the other vacuum consumers (HVAC, etc.) with golf tees.
If it shuts down quickly, then the leak is in one of the temporarily disabled circuits.
If it is still slow to shut down, then you have a leak in the shut down circuit.
A hard line might have a crack, the rubber connectors at the vacuum valve may need replacing, or the shutoff valve on the ignition switch may be sticking.