Ezl
 

Why does removing the vacuum line at the EZL on the 420sel make the engine idle quieter?

Thats a new one.... Sounds too good to be true..

The vaccum is there to let the EZL decide when to advance the timing based on the amount of vaccum.

More vaccum = Idle or slow moving
Less Vaccum = Wide Open Throttle or fast moving

So pulling the vaccum will let the EZL think that the car needs more advance timing and power thus advancing the timing.

I wonder if the quiter engine you are referring may be due to the absence of the shaking at low idle; in which case increasing the idle will smoothen it out a little....

Hope it helps.

It definitly sounds as if it slows the engine speed down at idle.

When I disconnect it it will move slower while when it is connected it will move faster!!! (560SEL 1989 Euro ver.)

Oh dear, could I have it wrong?

Anyone else knows?

Thaks

When vaccum drops, timing is retarded. Engine runs slower.
When vaccum increases, timing is advanced. Engine runs faster.