Please help on diagnosis: 1990 Chevrolet Cavalier 2.2L 4Door AC,PS,PB
60K miles. Problem: I hear too high rpm based on the sound, car runs
okay but no power climbing hill or accelerate on freeway from 55 to
75mph, runs okay at constant 60mph. When going up hill, makes a
tick-tick-tick noise on engine as if too low octane, or timing is
retarded. Checked compression: all good at 150,150,150,150. I have a
tachometer with 2 leads clips I do not know how to connect it since
the Cavalier does not have a high tension coil with 2 posts. Cannot
check timing since timing mark is hidden behind the serpentine belt
and timing is by metal timing chain controlled by many sensors to
computer. Coolant remain at green color no oil trace, oil normal
yellow and not millky. But oil consumption is high at 1 quart every
1000 miles in 3 months, tail pipe exhaust normal no white or blue or
black smoke. Spark plugs has white deposit and O2 sensor has white
deposit (spark plugs and O2 snesor are all changed, still same).
Changed gas to high octane, still same, used STP engine treatment,
still same. Car has regular maintenance : water cahnged, oil changed,
air and gas filter changed regularly.
Question: how do I check rpm with my tachometer? What do I do to
pinpoint what part to change?