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Possible Throttle Body issues

Old 07-27-2015, 08:43 PM
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Possible Throttle Body issues

Hey guys! My Rx8 has been running super exceptionally since I had the engine replaced with a rebuild and a new clutch and exhaust. However, its now been 7 months of driving fine and now the idle is all screwy. As I drive, the car surges, and when I stop at a light, the RPMs consistently move between 750 and 3k RPMs, and at times it shuts off on idle.

I took it to the Mazda dealer and they said that it may be the throttle body, but they did a function check and reset something and it was supposed to work. I got the car back and after 20 minutes, it did the same thing. They told me to park the car, turn the key to acc and pump the brake until I see the oil pressure build up and then turn it back on. I did this multiple times, and nothing has fixed it. So I guess I have to go back and get a new throttle body. Mazda quoted me at like $800.00.

Any ideas, comments, or suggestions.

-digitalmonkey79
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Old 07-27-2015, 09:26 PM
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It could be, but TB failures are pretty rare. Maybe a local member could help you out and let you install theirs?
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Old 07-28-2015, 07:28 AM
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Old 07-28-2015, 08:39 AM
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I'm not sure what in the TB would cause that behavior... there are plenty of moving parts, but they don't really fail in a way that makes your idle flop around sometimes.
I'm more thinking a gasket in the intake is leaking vacuum or you have a loose vacuum line. Definitely cheaper than $800 to check first?
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Old 07-28-2015, 03:32 PM
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Originally Posted by Loki View Post
I'm not sure what in the TB would cause that behavior... there are plenty of moving parts, but they don't really fail in a way that makes your idle flop around sometimes.
I'm more thinking a gasket in the intake is leaking vacuum or you have a loose vacuum line. Definitely cheaper than $800 to check first?

Yeah, that makes more sense to me as well. I'll definitely check out the intake and hoses in that area. Thanks for the input.
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Old 07-29-2015, 12:09 AM
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Neutral switch is the problem.

Can't find thread now, here is one that had different problem.

https://www.rx8club.com/series-ii-te...switch-256826/
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