Mash Seventy - Page 199

Chapter 8 Information service Section 1Troubleshooting
8-5
Complaint Symptom and possible causes Remedy
Engine idles
poorly.
1. Tappetclearanceoutofadjustment.
2.
Poor seating ofvalves.
3.
Defective valveguides.
4.
Worn downcamshafts.
5.
Toowidesparkpluggaps.
6.
Defective ignitioncoils.
7.
Defective CKP.
8.
DefectiveECU. ECU
9.
Defective fuelpump.
10.
Imbalanced throttlevalve.
11.
Damagedorcrackedvacuumhose.
12.
Defective TPsensor.
Adjust.
Replace or repair.
Replace.
Replace.
Adjust or replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.
Replace.
Engine stalls
often.
Incorrect fuel / air mixture
1.
DefectiveIAPsensororcircuit.
2.
Clogged fuelfilter.
3.
Defective fuelpump.
4.
Defective fuel pressureregulator.
5. Defective CLTsensor.
6.
Defective IATsensor.
7.
Damaged or cracked vacuumhose.
Fuel injector improperly operating
1.
Defective fuelinjectors.
2.
NoinjectionsignalfromECU.
3.
Openorshortcircuitedwiringconnection.
4.
Defectivebatteryorlowbatteryvoltage.
Control circuit or sensor improperly operating
1.
DefectiveECU.ECU
2.
Defective fuel pressureregulator.
3.
Defective IATsensor.
4.
Defective CKP.
5.
Defective CLTsensor.
6.
Defective fuel pumprelay.
7.
Defective TPsensor.
Engine internal parts improperly operating
1.
Fouled sparkplugs.
2.
DefectiveCKP orECU.
3.
Clogged fuelhose.
4.
Tappetclearanceoutofadjustment.
Repair or replace.
Clean or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Repair or replace.
Replace or recharge.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Clean.
Replace.
Clean.
Adjust.