legacycentral bbs

Sorry guys. but I did try a few searches for this,

the idle seems to bounce from 500 to 750 and back when I stop at idle.?

It goes away when the AC is on.

anyway I have to order some valve gaskets

Andy

I have this happen every once in a while...I rev the engine a bit, and it goes away.

sign of a problem to come???

I also have idle bounce.
Usually stops after driving the car for a little bit.

IAC valve.

scott, you think mine is going? It only does this once in a while...

I'll run a search in the meantime

I am also having troubles with an idle bounce on my '92 Legacy SS (auto). This happens when the engine is warm, but hasn't been running real long. When I stop at a traffic light the engine will idle fine for 10-15 seconds or so, then will idle down and almost die, but will then start to lope. I also have a problem with a lack of power when ran cold. Even when I'm boosting at around 9psi, there will be a significant lack of power. After I've driven for around 15 minutes, the power will return. I don't know if the two problems are related.
I've replaced a TPS that was out of tolerance, but there was no real noticeable difference. I was thinking maybe the bypass air solenoid valve because it seems to be on the same 12V supply as the wastegate solenoid valve that I am having problems with (boost drops to ~5psi, then back to ~9psi).
Does anyone have an idea of what to check?

The temp thing may be due to the coolant temp sensor not being good.

They're pretty cheap 20 bucks or so. I'd go ahead and replace it.

my friends DSM does this too.. just be glad that yours doesnt go between 1000 and 1500 like his... we think its his IAC as well