1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

compression test basics

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Old 05-03-04, 11:09 PM
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Question compression test basics

I have and 84 GSL with the engine from and 83 in it. I made the swap over a year ago. The car just doesn't run properly! Starts very hard, uneven idle and hesitates. I have removed the "bird's nest", put in a carb from a different FB that ran fine. New plugs, wires, distributor and ignitors. Fuel pump and regulator. I did the ATF etc... I figure it's time to do a compression check. I have a Craftsman Presure test kit so I would imagine it not the special one for Rotaries. What numbers should I be looking for as far as PSI? Is there a special orders as to which plug I should remove and test first?
Thanks,
Bob
Old 05-03-04, 11:27 PM
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your not going to be able to get an accurate compression reading with that guage. You can get an idea, by removing the bottom valve. The guage should bounce evenly 3 times. Same for the other rotor, if you have one or two that do not bounce, you have seal problems.
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