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Electronic Control System Signature, ISX and QSX15 Engines – Fuel in Coolant

Symptom Tree  t091

This is symptom tree t091
Cause Correction

Bulk coolant supply is contaminated

Check the bulk coolant supply. Drain the coolant and replace with noncontaminated coolant. Replace the coolant filters. Refer to in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

Fuel heater is malfunctioning (if equipped)

Check the fuel heater and replace, if necessary. Refer to the manufacturer’s instructions.
 

Cylinder head is cracked or porous

Remove intake and exhaust manifolds. Check for evidence of coolant leak. If necessary, operate engine at low idle. Pressure-test the cylinder head. Refer to Procedure 002-004 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.
 
Last Modified:  11-Dec-2003
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