Rough idle and whirring noise

[coopertrooper2001]

Another question about the Caterham Im afraid.

 

Standard Superlight running a K-Series with 5k on the clock. When the car is idling at 1200-1400 RPM from cold it is fine, but when it gets warm and idles around 900-1000 RPM it almost sounds like its hunting.

The potentiometer was replaced before delivery was taken but it still doesnt sound right.

I know its running an uprated cam but just doesnt seem right.

 

Also when you take your foot off the clutch and idle there is a strange whirring almost a grating noise, clutch in noise gone. CRB? Idler gear, drop gears?

[F355GTS]

CT

 

Gearbox noise sounds like the layshaft and TADTS

 

You say std Superlight then mention an uprated cam, is this as in uprated beyond the standard Superlight Cam?

 

Mark

[Shaun_E]

As standard, Superlight is fitted with 1.6 Supersport engine. Supersport cams are a little bit lumpy, especially if timed correctly. If it really is hunting badly then there might be something wrong - best bet is to go to your local meet and listen to some other SS engines.

As Mark says the gearbox noise is a standard feature .

 

Yellow SL #32

For Sale: wet sump, ali bellhousing, chrome headlights, sill protectors

Wanted: Black headlights, blank carbon dash

[Myles]

Have you checked that the IACV is plugged-in and working OK (you should be able to hear it whir when you turn the ignition on and off - after a short delay (IIRC - haven't driven my car for over a month now!)

 

When I picked up my s/h 7 last year, the idle was pants - and hunting - the IACV had been unplugged for some reason.

 

 

 

Project Scope-Creep is underway...

 

Alcester Racing 7's Equipe - 🙆🏻™

 

Alcester-Racing-Sevens.com

[coopertrooper2001]

thanks, thats my thought/hope - will check at the weekend