Operation Manual

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1979 Volvo 242 244 245

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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