MEGA BAD IDLE AFTER LAY UP?

[dodgydoughnut]

had the car sitting at work for about 6 months in the car park.thought i shoud get it running for up coming season. so quick jump start and fires right up,but its idle goes from 1k to 2k,jumping about every 2 seconds,had a quick look and throttle body elbow has split.so ordered up new and fitted.its the same.just put new battery on (been removed for about a week)any ideas

[DanThe]

Sometimes they do this when cold with an M50 manifold fitted, should come off pretty quickly though, check the throttle butterfly valve is shutting fully

[dodgydoughnut]

always been fine,will remove icv and check throttle,plus any hoses for splits,this is not a common problem then. its too noisy to run up to temp but i think it cleared after 3-4 min when i run it up the other week

[dodgydoughnut]

regarding manifold,this is a m50 2.5 engine and standard as from e36 as far as i know

[DanThe]

Oh ok, I was thinking M52 for some reason. But checks as above, ICV sticking is common when left for a while in cold/damp conditions

[dodgydoughnut]

had a quick look,removed icv,all hoses seem ok,fittings ok etc,wd40 icv and pushed it to and through.seams to move freely.refitted it and started. its the same revs from 1 to 2k every second.with it running unplugged icv and idle drops to 800ish perfect? is the icv valve at fault?

[macas]

I have this very same problem,mines been in a garage for year and i start it up every couple of months and the exact same thing happens,i have checked everything.

I just hold the revs at about 2k for about 20 secs then it idles perfect,might have somthing to do with the ecu?