Engine shutdown rattle after EGR/DPF delete – normal behaviour?

[Júlio Rocha]

Hi everyone,

I own an Accord 2.2 i-DTEC (N22B1) which has recently had a full EGR and DPF delete (both physical and electronic). Since these modifications, I’ve noticed a specific behavior that I’d like to run by you.

When I turn the engine off, there’s a very brief metallic rattle/chatter (lasting about 1 second) right at the moment the engine stops. It’s not violent or continuous, just a quick sound as it shuts down.

Key points to note:

• No vibrations or hunting at idle.
• No vibrations or weird noises while driving.
• The clutch bite is perfect and there’s no slipping.
• No clunking when pulling away or changing gears.
• Crucially: If I depress the clutch pedal while turning the engine off, the noise almost completely disappears.
• The car runs very smoothly, and injector values are all within factory specs.

My main question is: could this rattle simply be a result of the engine no longer performing a "soft shutdown"? I know many diesels use the throttle body/anti-shudder valve in conjunction with the EGR for a smoother stop, and I wonder if the delete makes the shutdown more abrupt.

I’d love to hear from anyone who has:

1. A deleted EGR/DPF on this engine.
2. General experience with the N22B unit.

Is this slight rattle considered "normal" under these conditions, or should I be worried about the Dual Mass Flywheel (DMF), even though there are no other typical DMF symptoms?

Thanks in advance for your help!

Note: translate PT-EN with IA

 

[F6HAD]

Sounds like your flywheel is a little out of balance, pretty common and nothing to really worry about until it develops into a knocking at idle.

 

[Júlio Rocha]

Shortly I will post a small video so you can see how it shuts off, with sound. Thank you F6HAD, always helping people. Happy New Year to you and your family!