Highpox1

When you pull the TB, is there a gasket that needs to be replaced or will it generally survive? How tough are the clips holding the plastic cover on the throttle sensor? Screwdriver pop-off? Thx..

docdrs

Iirc , there is a o ring sealing ring ( that should be replaced) but I reused. It is a simple process. The most dificult part is getting the rubber boot off between the tb and airbox

JAGMAN1

Those o-rings are pretty good. I don't think you'll have a problem reusing it. They're green, not rubber and maintain softness better than a normal rubber o-ring.

Pull the TB off and actuate the butterfly flapper. You should be able to feel any play.

Highpox1

This is a follow up to my previously documented surging issue, now 7 months later…The last threads were pre-summer heat, which temporarily halted the problem. Over the summer the warm air kept the surge from happening, but the idle became more unstable, hunting between 300 and 900 rpm routinely, even in warm conditions. Once the cooler air came in last month the surge started up again, more obvious now. Several weeks ago at 50F, it was so bad that the engine finally threw a code- in addition it shut off my power, allowing me to coast to a stop from 70 mph, no rpm’s allowed. The messages that followed were something like “PSM FAILURE” combined with “Minimum ENGINE POWER”. Restarting allowed me to gain speed, but in 20 seconds it cut off power again- same messages. I coasted back down. As luck would have it, I was 2 exits from the dealer. Doing this several times allowed me to limp into the service area. The code was in fact- bad Throttle Body. After all that, it did turn out to be the TB. The answer was right under my nose from last spring, but I never replaced it then because w/o a code it was (dealer) recommended to not add any more potential variables to the solution. In any event, after a new TB the issue has been resolved. Smooth as glass, no more surge, idle stable. Dang.

WhipE350

Thank you for the update. I sold a Boxster to a friend that has similar issue. I can always find a used TB and help him install it.