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The tool is nearly brand new. Bought it mid of this year and only used it 3 times since then. We mount the tool into one of the spark plug holes and then try to "start" the engine.
What needs to be mounted on the engine to have a reliable compression test? As we started the engine was mounted completely and in the end we tested it just with the heads and the Rocker arms/pushrods mounted.
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99 Alero GLS 
92 Chevrolet Caprice Classic 
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