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Old 05-30-2018, 07:27 AM   #1
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Same problem!

Just chiming in here. I have the exact same problem, and I mean exact, with one exception: I'm not getting a CEL. At low RPMs it hesitates and wants to stall. After warming up it seems to do fine. I removed and cleaned the air filter, throttle body and MAF sensor as you did. I can also feel occasional slight hesitation at higher RPMs during freeway driving. Checked my connections around the throttle body and everything seems to be tight. I'm going to replace the MAF sensor and see if that cures it. But I have one question for anyone who can help. When I reconnected the hard plastic air intake tube to the throttle body I noticed there was a thin O-ring that seemed to fit around the neck of the throttle body. With that O-ring in place I absolutely could not get the intake tube properly seated. Further, the O-ring didn't really fit around the throttle body snugly, but rather loosely, so I was confused as to its functionality. After more than an hour of trying to slip the intake tube back onto the throttle body neck with the O-ring in-place, I ditched it and tightened the clamp down extra securely. It seems to fit properly and doesn't move at all. However......as the problem is still with me, I'm suspicious of a vacuum leak I cannot see, or maybe that O-ring is critical and I should have it installed right. Anyone familiar with this?
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Old 05-30-2018, 08:06 AM   #2
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Quote:
Originally Posted by Dave2001S View Post
Just chiming in here. I have the exact same problem, and I mean exact, with one exception: I'm not getting a CEL. At low RPMs it hesitates and wants to stall. After warming up it seems to do fine. I removed and cleaned the air filter, throttle body and MAF sensor as you did. I can also feel occasional slight hesitation at higher RPMs during freeway driving. Checked my connections around the throttle body and everything seems to be tight. I'm going to replace the MAF sensor and see if that cures it. But I have one question for anyone who can help. When I reconnected the hard plastic air intake tube to the throttle body I noticed there was a thin O-ring that seemed to fit around the neck of the throttle body. With that O-ring in place I absolutely could not get the intake tube properly seated. Further, the O-ring didn't really fit around the throttle body snugly, but rather loosely, so I was confused as to its functionality. After more than an hour of trying to slip the intake tube back onto the throttle body neck with the O-ring in-place, I ditched it and tightened the clamp down extra securely. It seems to fit properly and doesn't move at all. However......as the problem is still with me, I'm suspicious of a vacuum leak I cannot see, or maybe that O-ring is critical and I should have it installed right. Anyone familiar with this?

Are you sure this O-ring is not the one that is supposed to be installed between the throttle body and the manifold? Could explain a leak.
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Old 05-30-2018, 08:20 AM   #3
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Yes, its called the throttle body seal gasket. It has a small tab on one side. And I agree, omitting it could explain a vacuum leak. However, I just simply couldn't get the intake tube back on with that thing in place. I wonder, should this gasket fit snugly onto the slot of the throttle body, sorta like a rubber band? The one I ordered fits loosely and therefore gets tweaked and pushed out of the way when I slide the air intake tube back.
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Old 05-30-2018, 11:45 AM   #4
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I meant to mention also, I have looked at several videos on YouTube showing the process of removing and replacing the throttle body, and in no case have I noticed one of those gasket seals in-place. I remain mystified as to the functionality of this gasket, although I would understand if it fit better and allowed the air intake tube to reattach.
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Old 05-30-2018, 12:04 PM   #5
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I never found an 'O' ring as you described when dismantling mine, but I'm like the 4th owner. However, mine is running well now but the CEL has popped on again. I'm gonna have the code diagnosed again. If it is O2 sensor related again, I'm gonna pull them and soak them overnight in gas, dry them out and reinstall. If there was an O ring involved in mine when new, it's not in the game anymore.
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Old 05-30-2018, 12:09 PM   #6
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Thanks, appreciate knowing that. Odd that our problem seems identical, and I'm not getting the CEL whereas you are.
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Old 10-08-2018, 02:43 PM   #7
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A bit of a delayed follow-up here but I hope you can help me. I'm still having persistent stalling problems with my boxster. I am wondering about the idle control valve, but I am a bit confused. Does the throttle body on my 2001S even have one of those? Or is it electronic?
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