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croat

By croat,
in General Automotive Discussion

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croat Mentor

croat

Posted
Posted

I have this problem when i rev my car and its not in gear the revs come back down and fall below the normal idle level. The car pretty much stalls then pics itself up again and idles normally. same thing if i take of fast then put the clutch in. anyone had this problem? Or know what is wrong?

Thanks...

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Al Grand Master

Al

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Posted

Read about this in HPI mag, problem is worse if you have a bigger turbo, should not really happen if engine is stock.

As you accelerate or rev, the butterfly in throttle body is open, once you let go of the accelerator the butterfly shuts. Due to the suction of air under acceleration, some of the air bounces off the butterfly and goes back through your a/f meter. This cools the wires in the a/f meter tricking the computer into thinking the engine requires more fuel, thus floods the motor for a split sec. HKS have a device to overcome this problem, not sure of the name.

Before doing anything, make sure the a/f meter is clean.

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Al Grand Master

Al

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Posted

The ecu is programmed for a plump-back, this floods the motor for a split second, to compensate for the lack of air.

Best bet is to put the stock BOV on and test it. Could solve all your problems, and make your car more enjoyable to drive and legal.

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