Possible cause Correction
Air filter clogged. Check air filter.*
Throttle
misadjusted.
Check that the throttle touches the high speed stop when the accelerator is fully
depressed.*
Incorrect timing. Check and adjust.*
Fuel filter clogged. Clean fuel tank filter and replace fuel line filter.*
Condition: Excessive fuel consumption
Possible cause Correction
Fuel lines leaking. Check tightness.
Spark plugs worn. Replace plugs.
Incorrect timing. Check/adjust.*
Air filter clogged. Check/replace.*
Control pressure
incorrect.
Check/replace control pressure regulator.*
Cold start injector
leaking.
Replace injector.*
(A leaking cold start injector also causes uneven idle and hard
starting.)
* Should be checked by a Volvo dealer.
pg. 83 Service diagnosis
Condition: Dieseling
Possible cause Correction
Injector
leaking.
Check air flow sensor plate and rest pressure.*
Condition: Misfiring at highway driving speed
Possible cause Correction
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