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Slight knocking on start up on cylinder number four

Tiny
2LEXUS JERRY
  • MEMBER
  • 2000 LEXUS ES 300
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 230,000 MILES
Misfire on cylinder number four, fixed by replacing coil pack. Now there is a slight knocking on start up on that cylinder.
Any ideas?
Saturday, April 28th, 2018 AT 8:21 PM

4 Replies

Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
Perhaps from the coil not working on number four the gasoline washed away the motor oil on the cylinder wall causing the cylinder wall to wear and rings enough that now you have some piston slap. See if some STP will quiet it down.
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Sunday, April 29th, 2018 AT 7:47 AM
Tiny
2LEXUS JERRY
  • MEMBER
  • 2 POSTS
It is more of a top end noise. I was thinking exhaust valve possibly?
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Sunday, April 29th, 2018 AT 8:50 AM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
Exhaust valve doing what?
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Sunday, April 29th, 2018 AT 8:56 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
If it was a valve problem it would be more of a tapping than a knocking. Can you please make a video of the noise with your phone and upload it here to the site in your reply?

Cheers, Ken
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Tuesday, May 1st, 2018 AT 1:34 PM

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