Spectrum 3.0L GM - Page 39

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Checks Action
Engine Mechanical
Checks
Important: The LPG Fuel system is more sensitive to intake manifold lea-
kage than the gasoline fuel system.
Check for the following:
 Manifold vacuum leaks.
 Venturi vacuum leaks.
 Engine Vacuum leaks.
 Improper valve timing.
 Low compression.
 Improper valve clearance.
 Worn rocker arms.
 Broken or weak valve springs.
 Worn camshaft lobes.
Exhaust System Checks
Check the exhaust system for a possible restriction:
 Inspect the exhaust system for damaged or collapsed pipes.
 Inspect the muffler for signs of heat distress or for possible internal fail-
ure.