Engine Hunt at Idel

[insite]

clean the idle air control valve

[aussieboxy]

Thanks and how do I do that?

[insite]

it's bolted to the driver's side of the throttle body. remove it (2 screws) and clean it out with carb cleaner. make sure the flap operates easily. re-install it.

while you're there, remove the intake hose from the throttle and look in it for oil. if you see oil, you probably need a new oil separator; this causes a vacuum leak that can cause your unstable idle.

also check for other vacuum leaks while you're in there. do this with propane or carb cleaner. wave / spray it around and see if the RPM's jump. if they do, you have a vacuum leak in that area. any of these can cause your issue without throwing a check engine light.

[aussieboxy]

Thanks I'll try that

[blinkwatt]

Originally Posted by aussieboxy

Thanks I'll try that

If that doesn't work you may want to smoke test the intake for leaks.

[aussieboxy]

Hi,

It's my 1st time workin on the Boxster. I had a bit of a look but was unable to see the throttle body. Do I need to take off the black induction pipes to get access to it. I got a Mitchells manual on CD and it's absolutely useless

Thanks for your help

[blinkwatt]

Originally Posted by aussieboxy

Hi,

It's my 1st time workin on the Boxster. I had a bit of a look but was unable to see the throttle body. Do I need to take off the black induction pipes to get access to it. I got a Mitchells manual on CD and it's absolutely useless

Thanks for your help

The black induction pipes(intake system) should lead up to a shiny metal thing,that's the throttle body. You should only have to loosen up the intake tubing to get the throttle body out. Before you do that and take a couple hours I would suggest just smoke testing which takes only a couple of minutes, if there is a leak then you saved a bunch of time.