[MR2] <MKIIT> "bouncing" idle

[Joseph Obernberger]

Perhaps there is water in the spark plug wells?
I would also look around for vacuum leaks.

Joe
http://videos.lovehorsepower.com

Kevin Parker wrote:
> Hi all,
>
> My idle is acting weird. When I first got the car, it was idling quite
> low (around 500 rpm). By sheer mistake, I realized that it was the
> BOV, so I replaced it. It would then idle at ~750 rpm, like it should.
> Well, then the knock sensor took a crap. During the time that I was
> waiting on the sensor, I replaced all the vacuum lines with the blue
> silicone, resealed the oil pan and gave the engine a good cleaning
> with a garden sprayer, some degreaser and the hose. Now the idle goes
> from like 250 to 500 in a regular rhythm like about a second at each.
> I have bled the coolant system, etc, although it was never opened,
> just to make sure. The only other issue is that somewhere in the car's
> history, the harness that plugs into the O2 sensor became two plugs
> rather than just one. Well, I got those in backward when I put
> everything back together (it's not hard to do). When I turned the key
> to the "on" position, the starter would turn, but the car wouldn't
> start. I did this probably three or four times before I finally
> figured out to switch those two plugs around and it started as
> designed after that. I have no codes and no other symptoms rather than
> the weird idle.
>
> Any thoughts?
>
>