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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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23,857 Posts
Do you think that the 'snap' was felt in the floor or the steering wheel?
Left or right side?
Possibly a motor or transaxle mount let go and engine vibration is now being transmitted 'metal-to-metal' into the body?
 

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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
Joined
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23,857 Posts
Is the low-speed vibration possibly a cylinder misfire? You stated that the car never performed very well at lower RPM. Leaky valves can cause this. It would be worst at idle.
A static compression 'leak down' test is better than a cranking compression test for diagnosing this. Air heard escaping from either the tailpipe or throttle body would indicate a leaky valve. Air heard escaping from the oil filler cap (crankcase) would indicate bad rings or piston.
I simply attach a compressed air hose to a fitting that screws into the spark plug hole. All 4 valves for that cylinder need to be closed for the test. A leaky valve (or rings) will be less noticeable as the engine speed is increased.
The tapping noise could be valve related and may possibly be related to a misfire. Some 2.0L engines did have a piston wrist pin tapping noise that got better as the engine warmed.
This is beginning to sound like an internal engine mechanical issue.
 
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