If no fault is found following the above steps, contact
your Volvo dealer.
* Should be checked by a Volvo dealer.
pg. 81 Service diagnosis
Condition: Erratic idle (misfiring)
Possible cause Correction
Intake system leaking.
Check vacuum hose connections at manifold and
auxiliary air valve.
Exhaust gas recirculation valve leaking. Test the valve function.*
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.
Cold start injector leaking. Test the injector function.*
Uneven compression. Test compression.*
Condition: Engine stalls at irregular intervals
Possible cause Correction
Defective wires.
Check wire terminals at: fuel pump, fuse No. 5, 7 and 13,
coil, distributor, ignition switch and relays.
Intake system leaking.
Check vacuum hose connections at manifold and auxiliary air
valve.
Low idle speed. Adjust.*
Exhaust gas recirculation valve seizing. Replace Valve.* (Engine will stall at idle.)
Fuel filter clogged. Clean fuel tank filter and replace line fuel filter.
* Should be checked by a Volvo dealer.
pg. 82 Service diagnosis
Condition: Low top speed, loss of power
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