I'm not a mechanic, but if this is a 4.0 L SOHC V6 engine, they have 3 timing chains. A main timing chain from the crankshaft to a "jackshaft" which is located where the camshaft is on the 4.0 L OHV engine. A 2nd timing chain from the jackshaft to the driver's side cylinder head at the front of the engine, and a 3rd timing chain from the jackshaft to the passenger side cylinder head at the back of the engine. When you said you have no compression on one side, I wonder if something has happened to one of your secondary timing chains ?
Most likely cause is a burnt out inlet valve. You need to do a compression check.
If engine is losing compression it is likely the rings are worn and need replacing. The valves are likely leaking too and need replacing.
Most likely worn engine mounts or transmission mount.
fuel problem most likely; remember, 3 things for an internal engine to run: fuel, fire, compression
If you have loss of compression then a full rebuild of the engine is most likely needed.
what;s the likely problem expected on a 4runner engine of 310000 km milleage?
Possibly, but not likely. Have a compression test run.
Broken cam or timing chain is the most likely cause.
Water in engine. Head gasket most likely. no aceleration because no compression.
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thats a little on the worn engine side of compression,but that in itself would not keep it from starting....most likely a fuel or spark problem. you can check fuel pressure with a screw in guage from autozone,and check spark with an inline spark tester from autozone.
Between 120 and 150 psi probably most likely 120ish