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Author Topic: Compression Test  (Read 1212 times)
OBD1 Kenobi
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« on: November 24, 2003, 11:29:14 AM »

Ok, I have tried searching but I couldn't find a write up of this in here.



Feel free to put your 2 cents in:



To do an accurate compression test, remove all the spark plugs from the engine. Prop the throttle plate so it is wide open, disconnect the distributor linkage, take the fuse out from the ECU. Connect a remote starter button from the positive (+) terminal of the battery to the small connector of the starter. Put the ignition key in your back pocket.

Now install the compression tester in cylinder number one and crank the engine about six or seven turns. Write down the compression reading and go on down the line. More important that the actual compression is that the readings should all be within 10% of each other.

Now that you have the dry readings, squirt two or three good squirts of motor oil into number one and do the test over. Note the reading next to the dry reading and go on down the line. Once you are done, compare the wet/dry readings. If the wet readings show a marked increase, say 20 to 25%, then you have ring problems and it's time for an engine overhaul. If there is a small increase, say 5 -10%, then the problem is in the valve seals and they will need to be replaced.



Brings me to this:

Cylinder Compression  

Engine                                PSI         Kg/sq.Sm
Carbureted 1300cc only   =     171     /     11.88
Carbureted all others        =   164     /     11.39
Fuel injected Si only          =  156     /     11.74
Fuel injected all others      =   185      /   12.85
Max variation bet cyls        =    28      /    1.94


So in that I'm on my way to grab a compression tester to see what my car's readings look like. I get a bluish tint black smoke at WOT. I'm hoping it's the valve seals, and give me an excuse to slap the Vtec head. Piston rings, and it's off to Noyanusa.com for another angine...


Is there anything I might have missed?
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« on: November 24, 2003, 11:29:14 AM »

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cottagecreep
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« Reply #1 on: March 05, 2004, 01:32:32 PM »

I'll agree with most of that, an easier way for some people would be to do the following.

Remove the 15a ECU fuse in the fuse panel under the hood. That kills all spark and fuel to the engine. Get in her, turn it over for 3 seconds with the key, and your foot to the floor on the gas pedal.

After your done, re-install fuse, and properly set your computer via the instructions in this forum.
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