Will vortex induction help cure my rough idle?

[brakedust300]

Having a few problems with my Cerb running a little rough on idle, i think i need to increase my idle RPM, is it just a mater of adjusting my throttle stop or is there an idle control on the throttle bodies?
I'm looking at getting the vortex induction kit with chip soon, will this help? as my old intake pipes are looking a little tired!

[trackcar]

there's a small bolt which acts as the throttle stop .. it has an 8mm spanner sized locknut on it. just release the locknut and turn the bolt until the idle is at the speed you require, then lock the locknut again. quite easy. the adjuster is on the rear of the drivers side throttles and it helps if you remove the rear purple pipes to get access. This could just be masking a problem though : your rough low idle might be a fault that needs addressing so treat this as a temporary fix until you can get the engine checked out maybe? there's obviously a reason why the idle is now lower and rougher than previously ..

[brakedust300]

I was thinking maybe my old air intake pipes are letting air in?.... had a similar prob on my old 300zx and spent ages chasing it until i replaced the intake pipes with polished steel ones, and that sorted it.

[Cyclone1]

Do you mean Whirlwind Induction?

[brakedust300]

Cyclone1 said:

Do you mean Whirlwind Induction?

Ahh..... Yep thats the one

[julian64]

I rekon most idle and rough idle problems in a cerb can be sorted by making sure no unmeasured air is getting in.

[trackcar]

The Cerbera has no way of measuring the air going into the engine, so any leaks upstream of the throttle butterflies will have no effect on the running of the car barring slight power loss through hot air maybe, but certainly won't cause these running symptoms. An air leak through the inlet manifold heat barrier O rings would cause an issue as that will alter the individual airflows the cylinders with the leaks will see, the total mixture change will be corrected for by the lambda sensor, but that doesn't get over the individual mixture offset and varying hp outputs of the affected cylinders. In short : no, changing the pipes won't make a blind bit of difference, but sounds like you do have a problem somewhere.

[julian64]

Sorry, but I meant the butterflies as the measured air. They measure the air just as surely as a mass air flow sensor, they are just less accurate .

Okay, okay, I was a bit obscure on the terminology