Hi i have just had another engine put in my s2, only now it won't idle you have to keep the revs up. On my old engine this was the same until it was warm, but now it cuts out even when it is warm it is also sounds rough on low revs.

I have checked the compression thats good also changed the plugs ht leads checked all pipes and wireing but still the same so any help would nice, mabye i just need it tunned...

 

aux air device (idle speed control valve) is it the same one your using?

might need a set up, mixture shite? metering head needing a clean/service?

 

Yea cheers checked the plugs before and it apears to be running very lean so im just gonna give it to the experts.

 

temp fix is on the throttle bodie, there is a big screw underneath. give that a tweak till it idles at about 900rpm then get to a proper tuning centre ASAP

 

When i had my new engine put in, it had a tiny tiny air leak and would not idle/ran rough
Mine turned out to be a split in the gasket on the throttle body, but was also told to check simple things like if the dipstick was in properly and oil cap was on tight - worth a try?