vietboicmb

Can somebody explain to me in detail on how to correctly check compression on an 87 rx-7 turbo???? Because I am about to buy this car and I want to do a compression check on it by myself .....the mazda dealership charges too much($110) to do the check....Please anybody....explain to me...THANKS...

rgordon1979

iTrader: (3)

Try to search, I am sure there is someone who can explain it better than me. I did one two weeks ago.

On a normal compression tester, you will have to take the one way valve out of the hose that goes to the gauge. (I think it is called a schrader vavle.) Take both of the bottom spark plugs out of the engine, take the egi fuse out of the fuse box, and unplug the coils. Not sure if you need to do that, but i did it just to make sure i did not get shocked.....again. Screw the compression gauge on each of the spark plug holes (one at a time of course) and have someone crank the engine. Some people say to hold the gas peddle to the floor, but i think that is only for carburated engines. I tried it, did not make any difference in the compression. When the person cranks the engine, watch the gauge like a hawk, the needle should bounce to the same place on the gauge continuously. On an 87 it should be around 100 psi, not sure though. Sorry if this is completely unclear.

rgordon1979

iTrader: (3)

and don't forget to have the engine at operating temp. when you do the check.