compression test slow build up

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Aug 17, 2016 | 12:49 PM

apiazza2010

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From: Melbourne,FL

compression test slow build up

I have a 02 ls1 with HCI, I did a compression test, I am getting 180 values on all cylinders.
The problem I'm having is it's very slow in building pressure.
Is this normal ?

Aug 17, 2016 | 12:55 PM

G8One2

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From: Detroit, MI

I would suspect valves are not sealing well. Usually it jumps to 90 or higher on the first pulse if you have good sealing valves.

Aug 17, 2016 | 02:15 PM

squarles67

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From: Orange, Texas

Do you have the throttle body or carb wide open?

Aug 17, 2016 | 02:20 PM

00pooterSS

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From: Dallas

That's odd. Are you having a problem? If not I would suspect the gauge itself or the way you are doing the test. Make sure you have the throttle body or carb open (pedal to the floor) like stated above.

Aug 18, 2016 | 11:38 AM

apiazza2010

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From: Melbourne,FL

I just tried the test again with the throttle body wide open and it does the same thing.
The car runs well, I'm putting it up for sale and want to disclose the compression numbers to buyers.
Can i test if the valve are not sealing well?
The test shows about 180 for all cylinders