Volvo 240 - Manual (Page 105)

1987 Volvo 240
Condition: Erratic idle (misfiring)
Possible cause Correction
intake system leaking. Check hose connections.
Spark plugs, high tension leads or distributor
cap worn (detective) Clean distributor cap and leads, check the cap for
cracks. Replace defective or worn parts.
Worn spark plugs. Remove. Clean or replace spark plugs.
Condition: Engine stalls at irregular intervals
Possible cause Correction
Defective wires.
Check wire terminals at: fuel pump, fuse No. 5 and 7, coil, distributor, ignition
switch and relays.
Intake system leaking. Check vacuum hose connections at manifold and auxiliary air valve.
Fuel filter clogged. Clean fuel tank filter and replace line fuel filter.
pg. 93 Service diagnosis
Condition: Excessive fuel consumption
Possible cause Correction
Fuel lines leaking.
Check
tightness.
Spark plugs worn Replace plugs.
Condition: Misfiring at highway driving speeed
Possible cause Correction
Spark plugs
fouled.
Drive the vehicle in a lower gear and keep the engine rpm higher for a few miles
in order to remove carbon deposit on the spark plugs. If this procedure is not
effective, clean or replace the spark plug;
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