98 gs300 weird idle in drive

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02-02-17, 09:45 PM

jzguy97

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98 gs300 weird idle in drive

I have a 98 Lexus gs300, idles normal but once I drive to a stop light and sit there the idle drop for about 3-4 seconds then I goes back to normal. Anyone else have had this problem?

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02-03-17, 03:27 PM

Mr Jokster

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Possible vacuum leak. This likely is related to when you step on your brakes. Could also be a voltage drop do to your booster resetting itself (again, related to braking)

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02-03-17, 06:45 PM

jzguy97

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Quote:

Originally Posted by Mr Jokster

Possible vacuum leak. This likely is related to when you step on your brakes. Could also be a voltage drop do to your booster resetting itself (again, related to braking)

Thanks, might get it checked out at the dealership because im not 100% sure about it.

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02-04-17, 06:26 AM

kevin3344

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I have a GS400 but when that happened it was a vacuum leak. My RPMs would drop very low and sometimes it would stall at a light but immediately start back up. The dealer narrowed it down to a bad hose.