Mechanical Over-rev / Money Shifted

Rreedd

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Why are you compression testing the engine and assuming it's ok? Your piston rings won't be damaged on an over-rev. This doesn't make any sense to me.

What more likely happens is you have valve float occur and you burn your valves. This can also lead to valve and piston contact- valves stay open longer than they should and the pistons come into contact. It depends how fast the engine was actually spinning, and for how long it was spinning at that speed.

If the engine is still running after a misshift, there likely is no issue. The engine can still run if the valves are only mildly damaged- his could result in additional engine noise, less power, worse fuel economy. A totally destroyed valve would likely take the piston out also. You'd know if that happened.

Either way, a compression test won't tell you much.
That compression test also tests the valve timing...which could be a issue after a over rev(stretched timing chain)
 

Sil98

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can any scan tool pick up the overrev code or do you need a Honda tool?
Autel AP200 can pick it up: "P0219:00 Engine over speed condition Permanent DTC"

Autel MaxiCheck manual states: "Permanent DTC shall be stored in non-volatile memory and may not be erased by any diagnostic services or by disconnecting power to the ECU.".

I suspect the Honda dealer diagnostic tools can detect this code even if somehow "erased". No doubt there are Honda Techs and factory reps on this forum who can confirm/deny this.
 

gtman

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I doubt 7,000 rpm is storing an overrev code.
 




 


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