Spectrum 3.0L GM, Parts & Service Manual

Page: 39 / 327

39
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.