would i have low compression on all cylinders cold if the lifters weren't pressing up?

10

Asked by Feb 14, 2016 at 03:03 PM about the Chevrolet Silverado 1500

Question type: Maintenance & Repair

2 Answers

60,395

If the valves are closing then you will have full compression. Lifters not pumping up would not have any effect on compression. When you do a compression test prop the throttle open so you get air into the engine.

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In addition, if all cylinders test low or zero, it's jumped timing. HTH. -Jim

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