About a year ago on start-up, the M50 idle reved up to @ 3000 rpm, then back to 700, continuing this until turned off and re-started. While doing this dance, I noticed the ‘check engine’ light was on (the first time I’ve ever seen this). Recently, this has happened on a few occasionson start-up and even while on the highway (I notice check engine light, dis-engage clutch at 100km/h and watch the revs dance, give it some gas and it stops).

I did a search and found a discussion on M50 eratic idle which mentions the ICV and throttle switch.

Has anyone experienced this? It occurs infrequently and is not a major concern as of yet, but would like to gat a handle on it before driveability becomes an issue.

Over and out,

Dave M