RPM DROPS & ENGINE SHAKES SUDDENLY DURING IDLING.

1999 Lexus GS 300

Tiny

samson_bmw

January, 4, 2011 AT 12:28 PM

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.

FOUND 470 RELATED QUESTIONS

1 Answer

Tiny

KHLow2008

January, 10, 2011 AT 5:04 PM

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.

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