Low idle

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Sep 9, 2023 | 10:42 AM

MaxKechely

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Low idle

I recently took off my throttle body to clean it, I put in new PCV and vacuum hoses as well. Now I idle at around 500rpm when the car is warmed up. Any ideas?

Sep 9, 2023 | 10:44 AM

MaxKechely

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Before this my idle was around 800rpm, there also was a bit of coolant in the bottom on the intake manifold but I cleaned it out if that matters.

Sep 9, 2023 | 06:36 PM

Yamae

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Quote:

Originally Posted by MaxKechely

Before this my idle was around 800rpm, there also was a bit of coolant in the bottom on the intake manifold but I cleaned it out if that matters.

A new throttle body needs to reset the ECU. A simple way to reset is to remove the battery terminal for several minutes or more. Other than this, it's better to clean the air mix passages using a compressor + a can of carbon solvent.

Sep 9, 2023 | 09:37 PM

MaxKechely

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Okay I will clean out the idle bypass valve again maybe it was the gasket I put on it, I already disconnected the battery for a while but I did it while the throttle was detached so I will do that again as well, thank you!

Sep 10, 2023 | 09:00 AM

TominPT

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You need to clean out the two larger ports as well as the 8 little holes when you remove the little metal cover on top of the throttle body - as Yamae states. There are other posts and illustration on this especially in the LS400 forum.