1986 Volvo 760 GLE, Turbo
Condition: Excessive fuel consumption
Possible cause
Correction
Fuel lines leaking.
Check
tightness.
Spark plugs
worn.
Replace plugs.
pg. 82 Service diagnosis
Condition: Erratic idle (misfiring)
Possible cause
Correction
Intake system leaking.
Check vacuum hose connections at manifold and
auxiliary air valve.
Spark plugs, high tension leads or distributor cap
worn (defective).
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. 1 and 11, 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.
Condition: Misfiring at highway driving speed
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.
Please be aware that misfiring spark plugs can cause damage to the catalytic
converter.
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