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Dankie Gert! Want to replace them as preventitive maintenance, but for interest sake, what would be the signs of them being kaput?
 

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Dankie Gert! Want to replace them as preventitive maintenance, but for interest sake, what would be the signs of them being kaput?
They will go kaput if you mess with them - take them out, etc... In Situ they should last the lifetime of the engine / car...

If the top rings are bust, you'll smell the petrol leakage and might notice the fluid. If the bottom rings are bust, it will rather draw false air as the vacuum force is higher that the post - injection fuel pressure. That will lead to lean burning at the start that will eventually trigger injector out-of-range warnings as the lambda readings will not correlate to the MAF readings
 
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