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1993 Volvo 850 GLT
Excessive fuel
consumption
Spark plugs worn.
Replace plugs.
Erratic idle
(misfiring)
Intake system leaking.
Check vacuum hose connections to manifold and idle air control valve.
Worn spark plugs.
Remove. Clean or replace plugs if necessary.
Engine stall at irregular
intervals
Defective wires.
Check terminals at: fuel pump, coil, ignition switch and relays.
Intake system leaking.
Check vacuum hose connections at manifold and idle air control valve.
Fuel filter clogged.
Clean fuel tank filter and replace fuel line filter.
Misfiring at highway driving
speed
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 deposits on the spark plugs. If this procedure is not effective, clean or replace the spark plugs.
Please be aware that faulty plugs can damage the three-way catalytic converter.
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