Sticky throttle

[Imran999]

My Cerb has suffered from a sticking throttle before and then was fine for a while.

But today it started again.

See here: https://share.icloud.com/photos/0_1fvQAqNDUWrO-PGP...

I’m wondering if I should just replace the throttle return spring on bank 1, perhaps it has become a little weak?

Any help would be greatly appreciated.

Thanks

[Byker28i]

Jools fitted a second to mine years ago.

[stuthemong]

I squirted some lubricant (PTFE bike lube) down the cabke opening beside the driver side throttle bodies.

Its a beaut now.

Recommended over more springs as the pedal i have is nice and light, which is a lovely feeling

Stu

[Imran999]

stuthe said:

I squirted some lubricant (PTFE bike lube) down the cabke opening beside the driver side throttle bodies.

Its a beaut now.

Recommended over more springs as the pedal i have is nice and light, which is a lovely feeling

Stu

thanks, this seems like it's worth a try!
I have silicone lubricant and WD40, not too familiar with PTFE bike lube, assuming it won't make too much difference either way?

[stuthemong]

Go with the Silcone, not wd40.

Took me a few ledal presses and an overnight leave and the next day was like a new cabke and has been fine ever since (many months)

[Imran999]

stuthe said:

Go with the Silcone, not wd40.

Took me a few ledal presses and an overnight leave and the next day was like a new cabke and has been fine ever since (many months)

great, will give it a go.

Thanks mate!

[Imran999]

Unfortunately lubricating the cable didn't solve the issue :-(
It is still sticking, albeit at lower revs - not sure if that's a sign.

The way the revs flare so quickly (and die so quickly) is one of the real pleasures of the Cerb, makes it feel like a real race engine.

[tejr]

Mine turned out to be frayed at the pedal side. Couldn't see it but I wasn't happy with the throttle response so Jody replaced mine when he did the 12k service. It felt like a totally different car after. The revs just didn't rise and fall as freely as they did now. And would often fall at an even slower rate from 1500rpm to idle.

[env]

I had the same - got the throttle cable replaced, made the world of difference.

[Imran999]

Thanks for all the input - I will set about replacing the cable (doesn't look trivial) and report back.

[Imran999]

I simply can’t imagine how anyone gets in to the footwell to replace the throttle cable - I could barely get a look at it (didn’t seem frayed), let alone try and get my hands in there, to replace it.

That’s one job I am really not looking forward to doing.

I took the throttle link rod off and removed the helper spring. Throttles on both banks had reasonable return action (torsion type spring on throttle rod) and weren’t binding at all.

The helper spring seemed tired though, so I picked up a replacement (similar, but not exact).

After driving the 911 all week, I couldn’t wait to get the TVR back out and was praying my issue was resolved.

Pleased to report that the issue was resolved, and I thoroughly enjoyed heel and toe on every downshift - the Cerb setup is just a delight and i love the gearshift.

Interestingly, after the clinical perfection of the 911, the Cerbera was utterly exhilarating - total animal of a car!

Remarkable, how 20-25 years on, these cars are still so amazing.

Thanks for all your input and help!

[tejr]

Hard to beat the rawness. Nothing 'modern' comes close to that feeling.

I finally got round to adjusting the brake pedal as it was sitting far too high. I can finally heel-toe it and, like you say, its a real joy

[Imran999]

Very few cars have adjustable pedals. I managed to get the Cerb pedal setup bang-on where I wanted it, and it's amazing how much more comfortable I am driving it in anger.