1A-11 Engine General Information and Diagnosis:
Engine runs poorly in
high speed range
(Defective engine internal/
electrical parts)
Weakened valve springs. Replace.
Worn camshafts. Replace.
Valve timing out of adjustment. Adjust.
Too narrow spark plug gap. Adjust.
Ignition not advanced sufficiently due to
poorly working timing advance circuit.
Replace ECM.
Defective ignition coil/plug gap. Replace.
Defective CKP sensor. Replace.
Defective ECM. Replace.
Clogged air cleaner element. Clean.
Clogged fuel hose, resulting in
inadequate fuel supply to injector.
Clean and prime.
Defective fuel pump. Replace.
Defective TP sensor. Replace.
Defective STP sensor or STVA. Replace.
Engine runs poorly in
high speed range
(Defective air flow
system)
Clogged air cleaner element. Clean or replace.
Defective throttle valves. Adjust or replace.
Defective ISC valve. Replace.
Sucking air from throttle body joint. Repair or replace.
Defective ECM. Replace.
Defective secondary throttle body joint. Adjust or replace.
Imbalancing throttle valve
synchronization.
Adjust.
Engine runs poorly in
high speed range
(Defective control circuit
or sensor)
Low fuel pressure. Repair or replace.
Defective TP sensor. Replace.
Defective IAT sensors. Replace.
Defective IAP sensor. Replace.
Defective ECM. Replace.
TP sensor out of adjustment. Adjust.
Defective STP sensor or STVA. Replace.
Defective fuel tank pressure control
valve.
Replace.
Defective GP sensor. Replace.
Defective ISC valve. Replace.
Engine lacks power
(Defective engine internal/
electrical parts)
Loss of tappet clearance. Adjust.
Weakened valve springs. Replace.
Valve timing out of adjustment. Adjust.
Worn piston rings or cylinders. Replace.
Poor seating of valves. Repair.
Fouled spark plugs. Clean or replace.
Incorrect spark plugs. Adjust or replace.
Clogged fuel injectors. Clean.
Clogged air cleaner element. Clean.
Sucking air from throttle valve or
vacuum hose.
Retighten or replace.
Too much engine oil. Drain out excess oil.
Defective fuel pump or ECM. Replace.
Defective CKP sensor and ignition coil/
plug caps.
Replace.
Imbalancing throttle valve
synchronization.
Adjust.
Condition Possible cause Correction / Reference Item
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