Started by Daytona, October 4, 2023, 16:42
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Quote from: Gaz mr-s on October 4, 2023, 16:52I haven't personally done it, but the pre-cats can be inspected via the O2 sensor holes.
Quote from: Daytona on October 4, 2023, 16:59Yes was thinking of taking a look, but I already know from what I have felt and seen in the oil that was dropped that the cat has disintegrated/is breaking down.....so I am taking it that the knock/tap is as a result of this and possible damage to bores, bearings etc. Mechanic said what's the point of removing head to have a look etc more money when the cats are on balance of probability goosed....pieces in oil, lamda issues and now a tap/knock at 2000rpm. So I guess I am starting from the premis my car has precat failure.....and cost effective recification, with best chance of no more such issues.
Quote from: Carolyn on October 5, 2023, 09:10Could even be a worn out chain tensioner, going by your latest description of symptoms. It's oil pressure operated and the oil pressure drops (especially at low RPM) as the engine warms up. Your profile tells me you're in the South East. I'm in Northants. I'd be happy to have a look at it, if you can get it here?It's almost impossible to diagnose these things at distance. We do have a good professional member @mr2garageswindon who might be your best bet for someone who knows his way round the 1ZZ engine. You might contact him.?
Quote from: Alex Knight on October 10, 2023, 17:09Here's a very useful video: