problem holding steady speed.

[blackbooty]

hi all,whilst holding a steady throttle position,i am finding the revs are climing by a couple of hundred rpm for a couple of seconds and then dropping back for a second then climbing again. Its happening at all road speeds and is very consistant. up by 200 rpm for 2 secs,back down for one sec,up by200 ect.
Any ideas?

[racer]

Wild guesses here, but idle valve or aircon compressor compensation valve playing up?

[blackbooty]

Wild guesses here, but idle valve or aircon compressor compensation valve playing up?

Ta racer,will investigate your leads.
wayne.

[blackbooty]

thinking about what you said racer on the a.c.c.v,when i put my aircon on it sounds like it turns on (compresses) for a couple of seconds and then shuts down for a couple of seconds and does that constantly,on off,on off.
too much of a coincidence i think.
on it tomorow.
ta.

[racer]

Switch the aircon off and pull the fuse. If the problem goes away, you're on to something.

[blackbooty]

Switch the aircon off and pull the fuse. If the problem goes away, you're on to something.

tried fuse 31 removal,but had no effect.
cant reproduce ac compressor on/off prob now either.
as my idle speed is rock solid,i guess that counts out the idle valve being faulty.
thanks,wayne.

[glock19]

Have you ever heard of the EGR (Exhaust Gas Recirculating) Valve ? This could act up too you know ?