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Throttle cut off at 5500RPM?


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My first post. I just bought the car and it does have an issue: When I accelerate the car pulls beautifully but falters at transition at little, once it passes 5000RPM it loses power. If I back of the throttle about 20% I get the power back with even more pull than before. ( What I think the car should have for acceleration at least) It idles and runs perfectly other than this one fault. Any thoughts or suggestions are truly appreciated!

99 Boxster

2.5L manual

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possibly running too rich.. MAF issue?

My first post.  I just bought the car and it does have an issue: When I accelerate the car pulls beautifully but falters at transition at little, once it passes 5000RPM it loses power.  If I back of the throttle about 20% I get the power back with even more pull than before. ( What I think the car should have for acceleration at least)  It idles and runs perfectly other than this one fault.  Any thoughts or suggestions are truly appreciated!

99 Boxster

2.5L manual

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Well I cleaned out the throttle body and installed a new throttle switch ($65) and this seems to have restored a ton of power! Where the heck did that come from? LOL Well the car now revs to 6000rpm without a hitch with a smooth transition but bucks and decels quickly when coming off WOT. I think a MAS is in order now.....I was hoping to avoid the $260 part replacement.

At 90,000 miles there was a considerable accumulation of a varnish type mess inside the throttle body and main airway passages moving towards the cylinder heads. The crank case ventilator feeds fumes into our airways via the throttle body and reburns the blow-by gases (as designed) but it leaves quite a nasty residue behind! A portion of a can of carb cleaner and a few paper towels and it was clean as new.. A dremmel tool was used for polishing... :D

Cleaning the throttle body out was easy but was rather daunting as this was my first project on my new baby. I learned a lot and am amazed at how simple the engineering is. The sensors must work and the computer does the rest.... Hmm....

It's not over yet and if interested, come back and I'll keep you posted on the progress with the repair of this type of failure.

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