Just killed my Cerb and nearly myself. What happened??
Discussion
Hiya, not fun is it, when the spring goes.
Mine went approaching a roundabout, although not as drastic as yours, it accelerated after i lifted off (which was late anyhow) went seriously sideways all the way round before it unstuck.
Now have two relief springs.
Fully comp engine re-build, or is this sort of thing not covered?
Call Andy at APM Automotive.
Good luck - good to hear you came out okay
Mine went approaching a roundabout, although not as drastic as yours, it accelerated after i lifted off (which was late anyhow) went seriously sideways all the way round before it unstuck.
Now have two relief springs.
Fully comp engine re-build, or is this sort of thing not covered?
Call Andy at APM Automotive.
Good luck - good to hear you came out okay
SmokinV8 said:
DonnyMac said:
Now have two relief springs.
Is this a mod we should all be looking at?(Not sure what happens with fly-by-wire cars though).
Sorry to hear of your troubles 
Throttle springs are used to close the butterflys not open them, so if it was the spring it would have been jammed open by something obstructing it, a sticking throttle cable, or sticking accelerator pedal?? The cylindrical object on the side of the engine you describe (AJP??) Is the PAS,Water,Oil pumps. On the positive side the over revving might have only damaged these and not the engine. Hope you manage to get it sorted.
Throttle springs are used to close the butterflys not open them, so if it was the spring it would have been jammed open by something obstructing it, a sticking throttle cable, or sticking accelerator pedal?? The cylindrical object on the side of the engine you describe (AJP??) Is the PAS,Water,Oil pumps. On the positive side the over revving might have only damaged these and not the engine. Hope you manage to get it sorted.Edited by Jester7 on Friday 12th September 07:42
There are four springs on my car.
One in each throttle rod housing, and two on the outside.
Any one of these springs should be able to close both throttles. At least they do on my car.
1) Springs have broken in the past and not been replaced so the safety margin is reduced.
2) throttle cable has managed to jam in sleeve. Not very likely as breaking is far more likely which would simply close the engine down.
3) butterfly rod has jammed in the head casing itself. Again rather unlikely.
Of the three of four cars this has happened to in my memory over the past few years on this forum, most ended in catastrophy to the car, and I very much suspect lack of attention to maintaining the four springs is the answer
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Throttle springs, condition of fuel pipes and oil relief spring, all seem to be things that routine servicing tends to overlook or miss out on for some reason. Which is a shame because I think they have caused premature ends to quite a few cars.
One in each throttle rod housing, and two on the outside.
Any one of these springs should be able to close both throttles. At least they do on my car.
1) Springs have broken in the past and not been replaced so the safety margin is reduced.
2) throttle cable has managed to jam in sleeve. Not very likely as breaking is far more likely which would simply close the engine down.
3) butterfly rod has jammed in the head casing itself. Again rather unlikely.
Of the three of four cars this has happened to in my memory over the past few years on this forum, most ended in catastrophy to the car, and I very much suspect lack of attention to maintaining the four springs is the answer
.
.
.
.
Throttle springs, condition of fuel pipes and oil relief spring, all seem to be things that routine servicing tends to overlook or miss out on for some reason. Which is a shame because I think they have caused premature ends to quite a few cars.
Mental note: if the engine is running out of control step one should be to dip the clutch to stop it slamming you into the scenery. Step two if you have the presence of mind is to switch the ignition off but with extreme care that you don't engage the steering lock while moving. The engine *should* be safe bouncing off the rev limit for a few seconds while you come to a stop, but that assumes the rev limiter is working and configured right. In any case if it's a choice of trash the engine or slam into the scenery it's a no-brainer so dip the clutch straight away regardless. Sorry to hear the OP has lost the engine but glad there were no injuries.
cerbieboy said:
very scary stuff.... its this sort of thread that tempts to sell up and buy a sensible car.... an nsx or exige say....
Sticking throttle aren't limited to TVRs.I've had the throttle stick on a BMW 323 (cable snagged on the throttle arm) and a 106 GTi (general accumulation of crud between a tight fitting plastic arm and its housing). A friend broke the pedal return spring on his Elise on KH too, with similar effects.
There are a whole variety of mechanical failures that can give you an OMFG moment (would brake or steering failure be any less scary?), and they can affect TVRs, BMWs or any other marque.
My sympathies to the OP
Edited by Nefarious on Friday 12th September 12:46
t" moment I have ever experienced.
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