Strange Lumpy idle.

[zxocmars]

Originally Posted by Dazz

Whats a fault code do then?

Oh dear

When you run the "self-diagnostic" function on the ECU it will give you codes for any problems that it may be sensing?

Search the forums for "ecu diagnostic" and I'm sure you'll find the instructions

[Dazz]

I'll give that a try in the morning, thanks.

[old-and-rusty]

Originally Posted by Dazz

I'll give that a try in the morning, thanks.

Let us know how you get on with the self-diagnosis .
Regards,
Ian.

[30psi]

The ECU prob wont show any codes. I would start with some decent HT leads, a new dizzy cap and rotor arm, and check the CO2 emissions at an MOT station

[blitz]

it's your idle air regulator. mine does the same thing. it won't affect anything

[30psi]

I just find a faulty air reg used to stop it idling fast when cold as I assume they get all gunged up.

[s13eater]

could it be anything to do with the iaa unit, as that is supposed to ramp the revs up when you switch the lights and other electrics on.