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1.2L REVOTRON ENGINE
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fuel lines are pinched or clogged
Correct the routine to avoid pinch,
or allow shop air to clear the clog in
the fuel lines.
Improper Electrical supply at pump
connector
If electrical supply is in proper
check electrical system.
In adequate fuel pump pressure
IF fuel pump does not built
pressure then replace.
Exhaust system / Catcon damaged
Check and take corrective action.
4. Engine Noise
Condition
Possible Cause
Remedy
Engine 'pings' or 'knocks'
while accelerating or
travelling uphill.
Improper grade of fuel
Fill fuel tank with a minimum BSIV
Fuel
Spark plugs excessively worn or
gapped improperly.
Inspect spark plugs. Replace if
worn.
Incorrect valve/ignition timing
Check timing system components
and repair or replace as necessary.
Excessively worn camshaft
Inspect camshaft lobes and run-out
for excessive wear. Replace as
necessary
Fuel filter if clogged.
Replace the fuel filter.
Fuel lines are pinched or clogged
Correct the routine to avoid pinch,
or allow shop air to clear the clog in
the fuel lines.
Improper Electrical supply at pump
connector
If electrical supply is in proper
check electrical system.
In adequate fuel pump pressure
IF fuel pump does not built
pressure then replace.
'Squeal' or 'chirping' while
engine is running.
Worn, oil-fouled, or improperly
adjusted engine accessory belt.
Check engine accessory belt
condition and tension. Adjust or
replace.
Belt
tensioner
not
properly
tightened or defective
Inspect the belt tensioners. Tighten
or replace as necessary.
'Clunking' or 'rapping'
noise from bottom end of
engine
Defective piston wrist pin, rod, or
main bearings
If noise occurs after taking foot off
accelerator pedal, inspect piston
wrist pins.
If noise is constant inspect rod
bearings and main bearings for
proper clearance and condition
Replace bearings as necessary.
'Tapping' or 'ticking' noise
from the top end of the
engine
Fuel injectors worn excessively
Fuel injectors will make some
ticking noise. Replace fuel injectors
if not putting out enough fuel to
cylinders.
Excessively worn camshaft
Inspect camshaft. lobes and runout
for excessive wear. Replace as
necessary.
Valve springs, tappets, or rocker
arms worn
Inspect valve train components;
replace as necessary.