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[camdjkim]

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[focodave]

Hi all,

Trying to figure out why theirs so much vibration on my gas pedal. When going over rough roads the gas pedal slaps the bottom of my foot. Any ideas why?

Also the stick shift has lots of vibration.

Need to know what year car you have, what engine, and what induction system (carb, injected?)
With the limited information you gave, I might guess you have an earlier carbureted car that might have a bad motor mount?
Perhaps the engine movement is being transmitted through the carb linkage to the gas pedal, and the shifter?
Need more information from you to be able to help...

[AriK]

I would start by having a look at the flex disk (guibo) and engine/trans mounts.

[narfire]

Engine mounts?

[vandor]

The stick shift vibration may be due to worn shift lever bushings. Remember that the shifter is bolted directly to the transmission, the only thing that dampens engine and driveline vibrations from coming through the shifter are the bushings between the upper and lower shift lever.

[quanta2]

I would take a look at my carrier bearing in the drive shaft for rotten rubber coming apart. Doesn't cost a penny to look.

Hi all,

Trying to figure out why theirs so much vibration on my gas pedal. When going over rough roads the gas pedal slaps the bottom of my foot. Any ideas why?

Also the stick shift has lots of vibration.

[camdjkim]

I have a 1971 Spider 124, with carb. The engine mounts look fine. Will have to check the other suggestions.

[camdjkim]

Need to know what year car you have, what engine, and what induction system (carb, injected?)
With the limited information you gave, I might guess you have an earlier carbureted car that might have a bad motor mount?
Perhaps the engine movement is being transmitted through the carb linkage to the gas pedal, and the shifter?
Need more information from you to be able to help...[/quote]

[baltobernie]

Your car has the old-style throttle assembly, which consists of a complex linkage mounted to the firewall. Fiat changed this in the mid-70's to a more modern cable arrangement. Mounting the throttle linkage on the car instead of the engine makes for a very shaky throttle response.

How did you test the engine mounts? Did you apply the parking brake, then have an observer watch for engine movement under load? If the mounts pass this test, trace the linkage from the carb back to the pedal, examining each ball joint and bushing for slop and movement. If the linkage is bad, post on Parts Wanted for a later model replacement. It's not a difficult modification.