You might have a broken Motor mount. This will cause the enginre to twist
and the throttle linkage to bind.
Stuart Somers
Two 81 Imperials
----- Original Message -----
From: "Philippe COURANT" <accf_clb@xxxxxxxxxxxxxxxx>
To: "IML Imperial Mailing List" <mailing-list@xxxxxxxxxxxxxxxx>; "Fwdlk"
<L-FORWARDLOOK@xxxxxxxxxxxxx>
Sent: Sunday, February 10, 2002 1:34 PM
Subject: IML: curious "cruise control" on my '57
> Hi,
> Today the weather was fine so i made a short trip (40 miles) with
> my '57. As i drive the car on straight road with few traffic, i
> want to see if the car goes fast. So i put a heavy pressure on
> the right pedal !! Speed increase fastly, 40, 50 , 60 mph but at
> 65 mph a curious thing appears: the engine suddently slows down
> until speed return to 60 mph. The same feeling as if i've
> released a little the gas pedal... Then (as i don't release the
> pedal) the speed increases again until 65 mph then slows down,
> then increases etc.. The gas pedal was not on the floor but there
> was no effect if i pushed it to floor, no engine rev.
> modification, like an automatic (and non adjustable !) cruise
> control !!
> I release the pedal until speed slows to 55 mph then i smash the
> pedal to floor: the car rushs very fastly .. until i reach 65 mph
> !! So impossible to exceed this speed, the engine speed decreases
> every time..( except in a small downhill where the "max. speed"
> is 70 mph).
> I suspect two things: a vacuum advance problem (or a mechanical
> advance problem) or a vacuum problem on secondary barrels of the
> carb. But i "feel" the opening of the secondary when i smashed
> the pedal below 65 mph !!
> Advance was set to 12° btdc some weeks ago (no test at high speed
> since), because before the setting was too high (20° !!) but car
> ran fine with this high advance (and exceed 65 mph ..).
> Any advises ?
>
> --
> Philippe COURANT (Pau, France)
> Imperial 57 Crown convertible
> Buick 58 Roadmaster sedan
>
> - American Car Club de France (ACCF) : http://www.accf.com
>
> - Chrysler Imperial France : http://www.ifrance.com/c-i-f
>
> - Cadillac " Standard of Excellence " :
> http://www.ifrance.com/accf-cad
>
> - SportsCars : http://www.ifrance.com/accf-sprtcar
>
>
>
>
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