Knocking on cold start

Tiny
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And now no matter how many times I hit the gas it won't do it, it's mostly when cold but random and not as bad as before.
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Sunday, April 3rd, 2022 AT 8:27 AM
Tiny
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Can you go to MODE 6 data and look at the misfire monitor counter stored? It keeps a record of misfires there. Let's see if by you moving the coil over if the misfiring is following it.
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Sunday, April 3rd, 2022 AT 9:09 AM
Tiny
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I'll check the misfire codes when I get home. Here is a video of it:
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Sunday, April 3rd, 2022 AT 1:58 PM
Tiny
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Can't find a mode 6. When the car started the misfire on cylinder 1 went up to 49 then back to zero, on other cylinders was around 2.
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Sunday, April 3rd, 2022 AT 3:00 PM
Tiny
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Now smooth again and not showing misfires. Very strange.
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Sunday, April 3rd, 2022 AT 3:01 PM
Tiny
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Here.
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Sunday, April 3rd, 2022 AT 3:02 PM
Tiny
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Also removed EGR connector and didn't do it so I have driven it like those 10 miles all okay. I will check when cold if the misfire is there.
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Sunday, April 3rd, 2022 AT 5:18 PM
Tiny
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Thank you for the update. Will check in the morning for your results.
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Sunday, April 3rd, 2022 AT 7:22 PM
Tiny
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Started it on a cold day today still with the EGR disconnected, no knocking at all.
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Monday, April 4th, 2022 AT 6:55 AM
Tiny
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The EGR doesn't do anything on start up or idle. If it were stuck open it would cause a hard start and really rough idling to the point of wanting to stall out. I did not hear any of those conditions in your videos. Can you read the ECM calibration number and post it on here? I want to see if there is an updated calibration. I can only check for USA/Canada market. I am not sure where you are and if this will help us, but it is worth a try.
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Monday, April 4th, 2022 AT 8:18 AM
Tiny
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How do you read the ECM calibration number? I am in the US.
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Monday, April 4th, 2022 AT 8:21 AM
Tiny
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Try to go into ECU information.
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Monday, April 4th, 2022 AT 8:33 AM
Tiny
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These?
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Monday, April 4th, 2022 AT 8:37 AM
Tiny
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It starts with 376. I posted the old and new calibration numbers for the year models. You may need to go on the generic side to read it. Also make sure it is the ECM module. That looks like maybe the hybrid module your looking at?
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Monday, April 4th, 2022 AT 9:08 AM
Tiny
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Nowhere to be found, used two different scanners.
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Monday, April 4th, 2022 AT 10:37 AM
Tiny
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Here is what the bulletin explains:

Vibration/Tapping and/or Misfire After Cold Soak

Service
Category Engine/Hybrid System

Engine Control

Market USA

Section

Applicability

Introduction

Some 2013 †2016 model year CT 200h vehicles may exhibit a vibration due to a rough idle and/or tapping noise from the HV transaxle after cold soak. The check engine light may also illuminate with Diagnostic Trouble Codes (DTCs) P0300, P0301, P0302, P0303, or P0304 (Random/Multiple Cylinder Misfire Detected). The Engine Control Module/ECM (SAE Term: Powertrain Control Module/PCM) logic has been modified to reduce the possibility of this condition occurring.

This would be the only other solution left to have completed and that is to have the Engine Control Module reflashed with the latest calibration if it is not current.
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Monday, April 4th, 2022 AT 11:05 AM
Tiny
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I see. I'll take it to Lexus to see if they can scan it.
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Monday, April 4th, 2022 AT 11:08 AM
Tiny
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Please let us know if your vehicle needed the update and if it helped.
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Monday, April 4th, 2022 AT 11:29 AM
Tiny
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I will. I made an appointment. It always makes me wonder how the heck an update can resolve such issues, I had a car that needed a transmission update to get it to be as smooth as silk when it comes to shifting.
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Monday, April 4th, 2022 AT 11:58 AM
Tiny
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That seems like where we are heading. Some of the newer vehicles have over the air software updates to avoid having the customer take it into the dealership.
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Monday, April 4th, 2022 AT 2:57 PM

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