when my car is warm the idle is a little odd, it sits at a proper 1000rpm then drop down to 500rpm for a second then pop back up then not do it for 20 seconds or so then do it again. this has only started happening since i fitted a new oil cooler and bunged up a few leaks in the exhaust. any ideas what this is ive had a quick search and im thinking maybe its a bad connection to the idle control valve?

I would give the idle valve a clean. they can get a build up of carbon and causes them to stick slightly. very easy to do. but requires removing battery (better access) to the bolts on the plenum.

This happened to mine but also cut out every now and again when the revs got too low. I stuck a bottle of redex in it, gave it a blast and seemed to cure it (touch wood)

 

Peter

pk i had a feeling it may be summin like this, gotta find it first :D

Next time u start it up ensure the fan is off and using ur foot pull the accelerator towards u so no acceleration is applied. The pedal could be slightly sticking, this happened to me.

just had a look at it didnt try the foot trick but i fiddled about with the coil packs and injector connections, i think its a misfire poor connection on one of the injectors. sounds a bit like a scooby at times, give ita wiggle sounds better, then worse etc. gonna run codes and clean the injector connections.

found it drivers side front cyldner isnt firing can remove the connection and engine note doesnt change. plug sparks, and ive done the screwdriver test and the injector is tapping however its a bit slower sopunding than the others i recon, matybe my imagination. gonna do an olhm test tomorrow