2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Simple compression test?

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Old Oct 6, 2007 | 04:47 AM
  #1  
Tsuka's Avatar
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Joined: Sep 2007
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From: Atlanta, GA
Simple compression test?

So I was told from someone on here I could do a quick and easy compression test by removing one spark plug from a rotor and rotating the engine to listen for swooshes.

So I tried this and here were my results:

1st rotor near the front of the car, made 1 swoosh sound then made 2 whistle sounds.

2nd rotor near the firewall spun over and over without making a sound.

I think I read some tricks to revive the seals to maybe get better compression, anyone know?

I have 3 weeks to get this car running and if I have to I'll tear down the motor and rebuild it (but hopefully not).
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Old Oct 6, 2007 | 09:52 AM
  #2  
SureShot's Avatar
Seduced by the DARK SIDE
Tenured Member 15 Years
 
Joined: Apr 2001
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From: Orange Park FL (near Jax)
With luck, it is just stuck seals.
This can happen if the car has been parked for months.
You want to loosen the carbon & varnish accumulation gummed up in the seal grooves.
A high detergent lube like Marvel Mistery Oil or automatic transmission fluid works.
Squirt it in the leading plug holes & crank the motor some to work it in, then repeat.
Let it sit a day.
Then do a compression check.
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