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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1444 (Engine Mechanical - 5.3L (Lm4)) >> Diagnostic Information and Procedures >> Base Engine Misfire with Abnormal Valve Train Noise

Base Engine Misfire with Abnormal Valve Train Noise

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
Base Engine Misfire with Abnormal Valve Train Noise

Cause Correction
Worn or loose rocker arms
The rocker arm bearing end caps and/or needle bearings should be intact within the rocker arm assembly.		 Replace the valve rocker arms as required.
Worn or bent pushrods
  • Replace the pushrods.
  • Inspect the top of the pistons for valve contact. If the top of the piston shows valve contact, replace the piston and pin assembly.
Stuck valves
Carbon buildup on the valve stem can cause the valve not to close properly.		 Repair or replace as required.
Excessively worn or mis-aligned timing chain Replace the timing chain and sprockets as required.
Worn camshaft lobes Replace the camshaft and valve lifters.
Sticking lifters Replace as required.
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