Volvo 240 Owner's Manual page 127

Volvo 1990 240 Model
Spark plugs, high tension leads or distributor
cap worn (defective)
Worn spark plugs.
Condition: Engine stalls at irregular intervals
Possible cause
Defective wires.
Intake system
leaking.
Fuel filter clogged.
pg. 95 Service diagnosis
Condition: Excessive fuel consumption
Possible cause
Fuel lines
leaking.
Spark plugs
worn.
Condition: Misfiring at highway driving speed
file:///K|/ownersdocs/1990/1990_240/90240_19.htm (5 of 7)12/30/2006 8:25:13 AM
Correction
Check wire terminals at: fuel pump, fuse No. 5 and 7, coil, distributor, ignition
switch and relays.
Check vacuum hose connections at manifold and auxiliary air valve.
Clean fuel tank filter and replace line fuel filter.
Correction
Check
tightness.
Replace plugs.
Clean distributor cap and leads, check the cap for
cracks. Replace defective or worn parts.
Remove. Clean or replace spark plugs.