Volvo 760 GLE Turbo 1986 Manual page 90

1986 Volvo 760 GLE, Turbo
Condition: Excessive fuel consumption
Possible cause Correction
Check
Fuel lines leaking.
tightness.
Spark plugs
Replace plugs.
worn.
pg. 82 Service diagnosis
Condition: Erratic idle (misfiring)
Possible cause
Intake system leaking.
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. Check vacuum hose connections at manifold and auxiliary air valve.
Fuel filter clogged.
Condition: Misfiring at highway driving speed
Possible cause
Spark plugs
fouled.
file:///K|/ownersdocs/1986/1986_760_GLE_Turbo/86760_05.htm (17 of 19)12/30/2006 7:52:34 AM
Correction
Check wire terminals at: fuel pump, fuse No. 1 and 11, coil, distributor, ignition
switch and relays.
Clean fuel tank filter and replace line fuel filter.
Correction
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.
Correction
Check vacuum hose connections at manifold and
auxiliary air valve.
Clean distributor cap and leads, check the cap for
cracks. Replace defective or worn parts.
Remove. Clean or replace spark plugs.