Mechanics

RPM DROPS & ENGINE SHAKES SUDDENLY DURING IDLING.

1999 Lexus GS 300 • 6 cylinder •

I have Lexus GS300 1998 model. There are two complaints with the car.
1) The Engine runs smooth in Idling for some time & suddenly the RPM drops for 3-4 seconds and the engine shakes & again the vehicle is normal. 2) When you accelerate uniformly the engine vibrates a lot. This symptom is not there during fast acceleration.
There is no DTC recorded.
Checked the vacuum pipes- found Ok
Replaced the HT cables.
Replaced the Spark plugs.
Replaced tb.
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Samson_bmw
January 4, 2011.




Was IAC valve replaced together with TB?

Try cleaning the MAF to see if it works.
Check the TPS to see if ti is working correctly.

KHLow2008
Jan 10, 2011.


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