Surging at idle?

[paulau]

Hi,

The idle on my NA6 has gone all funny. When sitting it at the lights with either the cutch in or out, the revs are sitting at a bit or under or around 2000rpm and surging up and down, any ideas on what could be causing this? I think it also doing something similar when driving as it just feels odd.

I did roll start it yesterday, so maybe that caused a problem?

Thanks,
Paul

[Garry]

Have you had a look for any vaccum leaks? Maybe one of the tubes came off or has a crack in it?

Check the plastic crossover pipe between the airbox and throttle body too. I've heard of them cracking or wearing through if they've been rubbing on a pulley wheel and doing all sorts of funny things to the idle.

[STV]

have you by chance degreased your engine bay recently?
if you have, then you have probably got some of the degreaser down to the plugs.. it will eventually evapoate..

failing that.. i would reset your idle to begin with, set it to about 950ish rpm, followed closely by the MX-5 answer to 95% of problems...

PLUGS & LEADS!! (reminds me, i need new ones too!

STV