Mash Seventy - Page 202

Chapter 8 Information service Section 1Troubleshooting
8-8
Complaint Symptom and possible causes Remedy
Engine
lacks
power.
Defective engine internal / electrical parts
1.
Loss of tappetclearance.
2.
Weakened valvesprings.
3.
Valvetimingoutofadjustment.
4.
Wornpistonringsorcylinders.
5.
Poor seating ofvalves.
6.
Fouled sparkplugs.
7.
Incorrect spark pluggaps.
8.
Clogged injectors.
9. Clogged air cleanerelement.
10.
Sucking air from throttle valve or vacuum hose.
11.
Too much engineoil.
12.
Defective fuel pump or ECU.
13.
Defective CKP andignitioncoils.
14.
Defective TPsensor.
Defective control circuit or sensor
1.
Low fuelpressure.
2.
Defective IATsensor.
3.
Defective CKP.
4.
Defective IATsensor.
5.
DefectiveECU
6.
Defective TPsensor.
7.
Defective GPswitch.
Adjust.
Replace.
Adjust.
Replace.
Repair.
Clean or replace.
Adjust or replace.
Clean.
Clean.
Retighten or replace.
Drain out excess oil.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Engine
overheats.
Defective engine internal parts
1.
Heavy carbon depositon piston crowns. .
2.
Notenoughoilintheengine.
3.
Defectiveoilpumporcloggedoilcircuit.
4.
Suckingairfromintakepipes.
5.
Use incorrect engineoil.
Lean fuel / air mixture
1.
Short-circuited MAPsensor / leadwire.
2.
Short-circuited IAT sensor / leadwire.
3.
Suckingairfromintakepipejoint.
4.
Defective fuelinjectors.
5.
Defective CLTsensor.
The other factors
1.
Ignitiontimingtooadvancedduetodefectivetimingadvance
system(CLTsensor,CKP,GP switch and ECU).
Clean.
Add oil.
Replace or clean.
Retighten or replace.
Change.
Repair or replace.
Repair or replace.
Repair or replace.
Replace.
Replace.
Replace.