1260 / 1428
FUEL SYSTEM
29
5. TROUBLE SHOOTING:
PROBLEM REPORTED
POSSIBLE CAUSE
CORRECTION
Engine missing on CNG and
runs well on petrol.
Inadequate CNG supply.
Check filter, pipe line, if required overhaul
high pressure regulator.
Ignition System faulty.
Check spark plug, Leads, Ignition coil
Air filter chock.
Clean air filter.
Wiring harness
Check injector wiring harness
connections for proper latching, terminal
loosening. Rectify
CNG Injector faulty, choked
Replace injector
Vacuum Leakage.
Check vacuum pipe for leakage.
Poor pick up. (CNG Mode)
Air filter chocked.
Clean air filter.
Solenoid chattering.
Clean solenoid plunger and spring
Ignition system faulty
Check ignition system. Rectify.
Vacuum Leakage.
Check vacuum pipe for leakage
CNG Injector faulty
Replace injector
Pressure Regulator faulty
Check gas delivery, replace if needed
No/Less/over filling in CNG
tank
Manual knob closed.
Open the valve.
CNG not releasing from
Regulator.
Manual knob closed.
Open the valve.
Solenoid valve not working.
Check the operation.
HP pipe line blocked.
Clear the blockage by compressed air.
Pressure regulator faulty
Check / replace Pressure regulator
CNG leakage
Joints, Gas Line,
Components.
Check and tighten the joints
CNG smell in the cabin
Leakage at filler valve joint
Check and tighten the joint.
Gas vent pipe blocked.
Check and clean vent.
Pressure regulator freezing
Inadequate coolant
circulation
Check the coolant hoses for damage or
leakage
Blockage in coolant circuit
Check & rectify.
CNG leakage from filter
Check & rectify.
Pressure regulator chattering
Solenoid plunger Housing
damaged
Replace Housing.
Fuel Selector Switch not
working. No fuel mode
Solenoid plunger sticky
Replace with housing.