Misses Under Load

Definition: Engine delivers less than expected power. Little or no increase in speed, when accelerator pedal is pushed down part way.

POSSIBLE CAUSE ACTION

Contaminated fuel ^ Check for water or excessive alcohol in fuel. Alcohol/Contaminants-In-Fuel Testing Procedure
^ Drain tank and add clean fuel.

Restricted exhaust system. ^ Check for excessive exhaust
(lead contaminated catalytic converter) back-pressure
^ Check for missing fill pipe restrictor
^ Replace catalytic converter if contaminated, restricted or damaged.


Low fuel pressure ^ Check fuel pump, fuel pump relay, fuel filter and pressure regulator

Pinched or collapsed fuel hose/line ^ Repair/replace as required

Throttle valve not fully opening ^ Check accelerator pedal travel
(Floor mat/carpet interference)
^ Check throttle cable adjustment

Dirty air filter ^ Clean or replace

Insufficient boost pressure. ^ Check boost pressure
Faulty bypass valve, actuator controls (bypass valve,
or boost control solenoid actuator and linkage,
and boost control solenoid.