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Valveadj valve lash 4.3l chevy 1999

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HYDRAULIC VALVES DON'T NEED ADJUSTMENT.  IF THEY TAP THE LIFTERS ARE GOING BAD.  OR THE OIL PRESSURE IS LOW.  TRY A STP PRODUCT OR AN ENGINE CLEANER FIRST.

Posted on Mar 12, 2009

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How to adjust valve lash on a 1990 Geo Storm


its an Isuzu engine.
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note the bad idea of ISUZU calling all 3 engine same name.
a horrid idea.
which one? the second was in USA and Canada only.
the second one was offered as the GSI. is yours that?

so I will attempt to guess for you, its the base engine.
(odds of coin toss)
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Check the valve lash between the rocker arm and valve stem on both the intake and exhaust valves on the number 1 cylinder, the intake valve(s) on the number 2 cylinder and the exhaust valve on the number 3 cylinder. If the valve lash on the intake valves is not 0.006 in. (0.15mm), adjust the valve lash. If the valve lash on the exhaust valve is not 0.010 in. (0.25mm), adjust the valve lash.

1.6L twin cam has shims.
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HLA= Hydraulic Lash adjusters.

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