RPM DROPS & ENGINE SHAKES SUDDENLY DURING IDLING.

  • Tiny
  • samson_bmw
  • 1999 Lexus GS 300
  • 6 CYL

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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Tuesday, January 4th, 2011 AT 12:28 PM

1 Reply

  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

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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Monday, January 10th, 2011 AT 5:04 PM

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