Replacement Throttle Cable

Published by David Flett on

With the airbox removed it’s easy to see where the throttle cable attaches and where it broke.

Broken Ferrari 308 throttle cable
The broken throttle cable

The cable is still attached to the carburetor linkage at the right-hand side and has broken just where it goes through the tensioning bolt on the cam cover on the left-hand side.

Missing Ferrari 308 throttle cable
The end is missing

The cable has snapped where it exits its sheath. In fact, it’s nowhere to be seen because the throttle pedal falling to the floor has pulled the cable back an inch or two.

Replacement Ferrari 308 throttle cable
Replacement throttle cable

The previous owner of my car had a clutch cable break prior to my purchase and being the conscientious owner that he was, he bought a replacement throttle cable at the same time as the replacement clutch cable. So I handily had a replacement in the big box of parts I bought with the car.

So what’s the best way to get the new cable in? The carburetor end of the cable is too wide to go up the pipe on the firewall, so the pedal-end of the cable must go down the pipe. 

Replacement throttle cable

The simplest way to do this I thought, was to tape the new cable to the old sheath and pull it down through the pipe to under the car and forwards all the way from the back to the throttle pedel: this was plan A.

Replacement throttle cable
The cable emerges from firewall pipe

Easily enough the new cable was pulled down to emerge from the bottom of the pipe under the car. At this point, I should have undone the duct tape, pulled the old sheath the other way to reveal the broken cable so I could then attach the new one to that with different duct tape and continue to pull from the throttle pedal end.

But I didn’t do that…

Because… sometimes… I am stupid.

What I did do was continue to pull the old cable from the throttle pedal end forgetting that the old cable had snapped within the sheath. So when I pulled, I ended up with a broken cable and only the broken cable at the pedal end. The new cable was still at the other end of the car.

Nuts.

Plan B then.

The new cable can be pushed forwards through the chassis member where it enters another pipe below the passenger cabin that guides it some of the way forward towards the throttle pedal.

Pushing in the new throttle cable
The next pipe going forward

A handy, dandy circular port cut in the undertray and sealed with a rubber grommet half way along provides access to the other end of the pipe where it emerges under the fiberglass floor of the passenger cabin. There’s a plastic grommet that needs to come off the end of that pipe so the end of the cable can be threaded through it.

Circular access port in Ferrari 308 undertray
The cable has to come through here

Then it is forward again to run about a foot between the undertray and the fiberglass floor to reach the throttle pedal; the bottom of which pokes down through fiberglass floor.

Ferrari 308 throttle cable pedal connection
New cable re-attached

With the cable now run from the back to the front, I needed to connect each end. There was a fair bit of under and over to adjust both ends (thankfully using the lift) as the cable is barely long enough to go between. 

At the carburetor end, we need to remove the old tensioner bolt and insert the new one since it is fixed to the replacement cable.

New tensioner bolt
New tensioner bolt

Finally, the end of the cable needs to be attached to the throttle linkage of the carburetors. Et voila!

Ferrari 308 throttle cable attachment
Finally attached!

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Disclaimer: 308restoration.com describes the restoration work I perform on my car and only my car. I am not a professional mechanic. The website content is presented for entertainment purposes only and should not by seen as any kind of advice, information, instruction or guidance for working on any other car. The opinions stated here are my own and no-one else’s.

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