Ecotek Powerboost foam

[Robby]

I treated my 190E with powerboost foam. Now its playing up.

While I was treating it the revs stayed at 3000 rpm and didn't want to drop back down. I took it for a little 15 mile drive after letting it cool down for a half hour (was getting a bit warm) and now it idles at 1000 rpm, builds up to 1500, then drops back to 1000 in a constant loop. Any idea what it could be?

Incidentally, the inside of the intake manifold is now nice and clean where it was quite dirty before.

 

[Robby]

Right. I took out the rotary idle actuator, sprayed lots of WD40 into it, tipped it out and it came out dirty. Kept on doing this until I ran out of WD, but looking into theres some fairly solid crud built up on on the inside that I can't get to. Anyone know if these can be stripped down to be cleaned properly?

Tickover is still high, sitting at 1500 rpm now.

 

[teky]

check for air leaks

 

[teky]

excess use of foam can burn valves out

 

[Robby]

It was the rotary idle actuator, it was rather clogged. Cleaned it out by flushing lots of WD40 through it, then running a 12v current through it a few times, flushing through more wd.. Basically just using WD to lift off the carbon and the mechanism to clean it all out.

Fixed now. Which is nice. I won't be recommending powerboost foam to anyone though.