I've been getting a thumping feeling through the accelerator pedal on my 94 aaz. It only happens under loaded light acceleration between 1500-2500 rpms. I haven't noticed any knocking noises. It has been doing it for the last 5000 km.
Engine has had quite low oil pressure for a while now (intermediate shaft bearings). It idles at 5-7 psi hot at oil filter for last 15000 km or so and I started using lucas oil stabilizer to help bring the pressure up since about 8000 km ago.
Any theories? I'm guessing rod bearings, but I wouldn't have expected them to last this long and would have thought I could hear them.
I'm more just curious than worried as this engine will be coming out of the car soon to make way for a rebuilt replacement.