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hi, first ..im going to buy a compression tester and i need to know how to use that baby...second..what would be the symptoms of a clogged EGR valve?

thanks
 

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bain said:
hi, first ..im going to buy a compression tester and i need to know how to use that baby...second..what would be the symptoms of a clogged EGR valve?

thanks
hi nox (high combustion chamber temps) raised CO as well. a stuck open egr will kill the motor at idle, as well as a closed idle circuit. and for the compression tester screw it into the spark plug holes, unplug the coil and crank the engine over. anything above 120 psi will run, but good is 150 and above.
 

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Compression test. This is outlined in most repair manuals but here is the basics.

Test is best done near operating temp. Doing the test cold will prebaby show a little higher results because things are not expanded like they would be at operating temp.

1. Remove ALL the plugs. The goal is to make a constant RPM for all cylinders. If you take the plugs out its less load on the starter and will pull the battery down less and give yo mor consitant repeatable results.

2. Cripple the Ignition. Easy way on the 22R and RE is unplug the wires going between the igniter and the distributor. No signal between those two it will not trip the coil to spark.

3. On a 22RE unplug the harness to the AFM and that will keep the fuel pump off. on a 22R don't worry about it. lack of spark plugs will prevent the carb from having draw to pull much fuel.

4. Hook up a battery charger to keep the battery at a constant full charge.

5. Prop open the Carb or the throttle plates. To do this on a RE take off the pipe between the AFM and the throttle. Open it wide and stick a BIG screw driver in there to hole it open.. On a Car take off the top of the AIr cleaner. GIve it full throttle, Hold open the choke plate and stick big screw driver down the throat to hold it all open. Faile you to have unimpeeded air will cause a low reading

6. Screew in compression tester and set it where you can see it as you crank. Crank. As you crank you will see each compression stroke make the needle jump. By the 4th compression strok it should not be comming up. It should have pretty well reached a maximim. write down that number.

7. Repeat for remaining cylinders.

8. squirt just a few drops of oil into each cylinder and repeat the tests.

9. Results.
"Dry test" should have a minimum of 128 PSI on all cylinders. 172 is text book perfect. The big thing you want to see is less then 10% variance between best and worst. More then that and you will start seeing idle lope.

The oil is a "wet test" to see how badly the rings are leaking. 5psi gain your not in to bad of shape at all. You see a huge gain on a low cylinder then you have ring problems.

Now no big change on a wet test over dry but a low cylinder might be mis adjusted valves. So if you see a lot of variance then adjust valves and retry to see if they come up more even.
 
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