1.2L REVOTRON Bi FUEL CNG ENGINE 13 fuel lines are pinched or clogged Correct the routine to avoid pinch, or allow shop air to clear the clog in the fuel lines. Improper Electrical supply at pump connector If electrical supply is in proper check electrical system. In adequate fuel pump pressure IF fuel pump does not built pressure then replace. 'Squeal' or 'chirping' while engine is running. Worn, oil-fouled, or improperly adjusted engine accessory belt. Check engine accessory belt condition and tension. Adjust or replace. Belt tensioner not properly tightened or defective Inspect the belt tensioners. Tighten or replace as necessary. 'Clunking' or 'rapping' noise from bottom end of engine Defective piston wrist pin, rod, or main bearings If noise occurs after taking foot off accelerator pedal, inspect piston wrist pins. If noise is constant inspect rod bearings and main bearings for proper clearance and condition Replace bearings as necessary. 'Tapping' or 'ticking' noise from the top end of the engine Fuel injectors worn excessively Fuel injectors will make some ticking noise. Replace fuel injectors if not putting out enough fuel to cylinders. Excessively worn camshaft Inspect camshaft. lobes and runout for excessive wear. Replace as necessary. Valve springs, tappets, or rocker arms worn Inspect valve train components; replace as necessary. 5. Exhaust System Condition Possible Cause Remedy Engine emits white smoke from tailpipe. Obstructed air filter or air Inlet Clean or replace air filter or Inlet. Head gasket leaking coolant into combustion chamber Inspect engine oil for coolant and perform engine compression test. Engine cylinder head or block cracked Inspect engine oil for coolant and perform engine compression test. Engine oil or other substance on exhaust manifold Inspect exhaust manifold for foreign material. Improper grade or contaminated fuel Rush fuel system with fresh, clean, fuel of the correct type. Replace fuel filter. Engine emits blue smoke from tailpipe. Worn or damaged valve guide seals Remove rocker arm cover and inspect valve guide seals. Replace as necessary. Engine crankcase overfilled with oil Check oil level; drain oil as necessary.
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