Hello, does anyone know what the compression should be for a 1993 Chevy Blazer? V6, Vortec, 4.2 ltr...
Thanx

 

I found this in an old thread:
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From the GM service manual:

Minimum compression recorded in any one cylinder should not be less than 70 percent of highest cylinder. No cylinder should read less than 100 psi. There example is if the highest cylinder reads 150 psi the minimum allowable at 70% would bre 105 psi.

The recommended proceedure is to remove all spark plugs, block the throttle plate wide open, disable the ignition system, zero the compression gage, crank the engine through four compression strokes. check all cylinders in the same manner. If a cylinder registers low compression, add one tablespoon of motor oil to that cylinder through the spark plug hole and re-check compression.
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Ain't the 'search' function grand?

 

thanx for the info, may i ask what you typed in for the search...i googled yesterday and found lots of sites that had the word compression in it but nothing that actually gave the psi..and i'm assuming that what's recommended is standard for all blazers?
thanx again

 

rriddle3 was refering to the "search" function on this site, not Google. it's right along the top of each page (in the dark grey header).
oh yeah, the engine is a 4.3L