Engine keeps rev-ing when accelerating..

[KillerJim]

Hi,

Got a weird problem here..

I took the Sag out for a run today and was on my way home when I noticed that she wasn`t popping and banging on the overrun as she normally does. After a minute I realised that the car was still rev-ing (as if I had the foot on the gas) when I hadn`t..

Now, it doesn`t happen when I accelerate slowly or am crusing - just when you give it some power (mind u, not that much as it was wet).

If I accelerate in this manner and go to change gear (i.e. clutch depressed, so neutral) the car will rev up a few thousand RPM and sort of stay there, if I touch the gas pedal at all it will drop down to 1500rpm and then idle..

The car's going in for a service in about 2 weeks (full 12k service - the "works" as such) but I`m wondering has anyone else had this? or knows what it could be?

Thanks!

James

[keirv6]

I would be checking the thottle linkage and cable.

[GreenV8S]

I'd suspect either the pedal catching on the carpet, the the cable itself starting to fray and stick inside the outer sleeve.

[VARLEYHYD]

This photo may help see where the cable fails



G

[Whitey]

or the return spring at the other end of the cable under the airbox or any part of the butterfly mechanism

[KillerJim]

Thanks guys, I don`t plan on moving her until I drop her to get serviced but I`ll have a look at those parts to see if I can spot any problems!

Thanks again!

[Chris Marriott]

Hi, I had this I ended changing the acc. cable and it made no difference so they cleaned all the peddle box out springs etc now good as gold.

[KillerJim]

When you say they cleaned out the peddle box, you mean the mechanism around the accelerator pedal?

Any idea how they cleaned it? I.e took it apart and de-grease/re-greased things?

J

[Chris Marriott]

TBH I dont really know. Martin at Racing Green took care of it for me. I watched them change the cable and they still wernt happy so I left them to it and collected it the folowing day pops and bags were back. I think it was just as you said, regreased etc.

[Chris Marriott]

TBH I dont really know. Martin at Racing Green took care of it for me. I watched them change the cable and they still wernt happy so I left them to it and collected it the folowing day pops and bags were back. I think it was just as you said, regreased etc.

[JonRB]

My Sag doesn't pop or bang.

Apart from this one time with the engine. Not sure if it went pop, or bang, though.

[KillerJim]

Just a little update..

After figuring out how to remove the panel around the pedals I had a good look at the cable and it looks fine.

Couldn`t see anything wrong with the other end of it either!

I`m wondering if the ECU is re-ving the engine but I`m not sure how it can do that - does it even have access to the throttle?

Once the rain has stopped here I will take her for a run tomorrow to see if she's still doing it, still less than a week to the service!

J

[TVR_owner]

KillerJim said:

Just a little update..

After figuring out how to remove the panel around the pedals I had a good look at the cable and it looks fine.

Couldn`t see anything wrong with the other end of it either!

I`m wondering if the ECU is re-ving the engine but I`m not sure how it can do that - does it even have access to the throttle?

Once the rain has stopped here I will take her for a run tomorrow to see if she's still doing it, still less than a week to the service!

J

Is the cable partially seized and maybe just requires lubrictation?

[tail slide]

Does sound like one thing I've come across; the plastic fuel line being tied too close to the accelerator cable, rubbing against it so it (sometimes!) slows the accelerator cable trying to return all the way to it's stop.

You could see it with a torch, below the throttle stop.

Not good for several reasons....

Edited by tail slide on Wednesday 20th August 21:14

[KillerJim]

Going to take the car for a run tomorrow (finally stopped raining) so I`ll see if its still the case and have a good look.

Thanks for all the replies..

J