Anyone recognise this lead?

[wellsie]

Found unattached just above where crank sensor is to left of engine, just below throttle body

[ossy]

You dont need that!
Its for the aircon .

[wellsie]

Thanks for the reply. Hoping it was something that could help me fix my problem. Losing power in accelerator after driving short distance. Works immediately after restarting

[Kapt. Q]

Thanks for the reply. Hoping it was something that could help me fix my problem. Losing power in accelerator after driving short distance. Works immediately after restarting

This is most likely to be a cycle valve failure, cheap and easy fix if it is. Do you have a check engine light when it occurs?

Cheers!

[tolsen]

... cycle valve failure, cheap and easy fix if it is.

Presta or Dunlop?

[wellsie]

This is most likely to be a cycle valve failure, cheap and easy fix if it is. Do you have a check engine light when it occurs? Cheers!

Yes I do get engine light. Any more info on how to fix? Thanks

[Ocracoke]

Yes I do get engine light. Any more info on how to fix? Thanks

You'll need to fit a replacement cycle valve. The part itself is cheap from a dealer (I paid less then £20 for a replacement relatively recently) and a simple unbolt/unplug/plug/bolt job. However, I suspect the issue is getting to it. I don't have a Roadster but on a 2002 City-Coupe, you would need to remove the rear panels to get to it and it is a little obfuscated by the crash bar.

[137699]

It's no easier on a Roadster. Best advice is, when you change it, fit some longer pipes and relocate the valve to somewhere more accessible.
That is of course, if it is a Cycle Valve issue, and not a lambda or MAP sensor failing...

As a veteran of 3 cycle valve failures, they have never yet resulted in an engine light for me, nor has restarting the car restored power. Only an ECU reset would get power back.

[Thrumbleux]

As a veteran of 3 cycle valve failures, they have never yet resulted in an engine light for me, nor has restarting the car restored power. Only an ECU reset would get power back.

Ditto.
When mine failed the boost ramped up (noticeable increase in torque) then fell away as limp mode was encountered. Only resetting the ECU brought the power back - only for the cycle to repeat. Note, resetting the ECU will eliminate stored fault codes.

[137699]

Agreed -but if it is cycle valve (again in my experience) they don't log a code anyway.

[Thrumbleux]

But whatever is causing the problem may...