I'm getting closer to having a good running engine (B20F). New manifold gasket made wonders and I've also adjusted the valves. Two jobs still left are ignition timing and flow testing of fuel injectors. I'd also like to do some checks on the FI system, but given the engine runs and starts OK, I figure it must be in reasonable working order. Now that the engine is idling smoother, I notice "rattling" and ticking sounds from within the engine. Odometer says 128,000, but it doesn't work so engine might have twice the mileage for all I know. Could anyone venture to suggest what are the most typical noises coming from an old engine and whether these jobs can be done with the engine in the car. I'm getting mentally prepared to do a complete rebuild, but I was hoping I could squeeze a few more miles out of it first. The engine burns about a quarter of oil for every 700 miles or so, but has no external leaks.

Thanks,
Kåre L