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baaaaad compression results?

 
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Old 08-10-2012, 10:52 PM
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baaaaad compression results?

Ok so i finished the test. Cyl 4. 80 psi Cyl 3. 80psi Cyl 2. 100 psi Cyl 1. 70psi

After i put everything back together i started her up and she bad like usual and tried to die... while running i unplugged the two vaccum lines on the back of the intake mani. Right by the throttle body and now she freakin idles perfect.... idk whats goin on... but if i rev a little high the rpm will drop real low for a sec. Then go back to abt 7- 900 rpm. Any input? The two hoses run to the cruise control and the intake control diaphram. Also still worried about my compression.
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Old 08-10-2012, 11:00 PM
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Re: baaaaad compression results?

The engine would not idle well at all before having these vaccum lines unplugged... it was a very rough idle and would not even idle on its own half the time without me feathering the throttle a little on start up.
But even then shed just die after getting on the throttle and letting it go
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Old 08-11-2012, 03:29 PM
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Re: baaaaad compression results?

Wet test today

4.115
3. 160
2. 160
1.120
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Old 08-11-2012, 05:27 PM
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Re: baaaaad compression results?

low dry compression means rings. low wet compression means valves/hg. looks to me like you have symptoms of both, only way to solve the problem is a full rebuild, or a new motor.
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Old 08-11-2012, 07:56 PM
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Re: baaaaad compression results?

I had my head re done about a year and a half ago, the mechanic was shady unfortunately, i was in a real bad spot but anyways, i think its just the rings being as that the dry compression was so low, almost half of what it should've been, and then wet it went up significantly for the two cylinders that weren't as low on the dry test, and for the other two cylinders they matched percentage wise in higher compression in comparison to cyl. 2 and 3. My next test will be a leak down so ill definitely be looking out for the valves as well.
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Old 08-12-2012, 02:01 AM
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Re: baaaaad compression results?

sound like you know what your doing. its kinda hard to screw up a head gasket replacement, aside from putting it upside down, messing up timing, something that you would notice right away.
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