Low Compression - Nissan Frontier Forum
 
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#1 (permalink) Old 11-11-2012, 01:24 AM
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Low Compression

Hi everyone,

I ran a compression test on my engine (KA24DE) and the results showed I had low compression, which would explain my poor gas millage and acceleration.

Cyl#1 145 PSI

Cyl#2 140 PSI

Cyl#3 140 PSI

Cyl#4 125 PSI (A 20 PSI drop scares me)

The specification for this engine showed min of 149 PSI and a max of 179PSI. My first thought would be worn compression rings, but I want to hear what you guys think? The engine only has 70,000 miles on it. I did forget to press down the gas pedal when I did the test (Was in a time crunch and forgot) would this cause false readings?

Thanks

Edit (Never mind the compression tester I used was faulty)

TOTALED: 2003, Super Black,King Cab, XE, 4 cyl Frontier
Exterior: Calmini Pre-Runner front bumper, 2" body lift, Bilstein shocks.

Last edited by Dutch; 12-16-2013 at 09:44 PM.
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#2 (permalink) Old 11-11-2012, 02:31 AM
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For best accuracy you should perform the test on a warm engine and wide open throttle, however in my experience this doesn't significantly affect the readings. Remove all the plugs, squirt a small amount of oil into each cylinder, crank the engine over for about 10 seconds, then recheck. If compression comes up a good amount then you are looking at worn rings. If about the same, then a valve sealing issue. Since you're low across the board I would suspect rings, but at any rate that sucks with the low mileage.
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#3 (permalink) Old 11-30-2012, 08:35 AM
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what is your mpg . also lucas makes a additive to add to the oil to improve gas milage
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