Mechanics

WHAT WOULD CAUSE MY MOTOR TO SHAKE

1999 Ford F-150 • 16,500 miles

Under load thr motor shakes but smooths out about 65mph. There is a hissing sound at the back of the motor and the service motor soon light came on.
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Azfirewomen
June 12, 2012.



There is an elbow for the pcv valve on the back of the throttle body that collapses and causes this condition.

Roy

ASEMaster6371
Jun 12, 2012.
Sounds like Mr. Roy is on the money here-Excessive false air leakage-Scan the computer for code/s, lets see what it has to say

Rasmataz
Jun 12, 2012.