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Compression test results

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Old 07-24-2014, 02:08 PM   #1
brich85 [OP] brich85 is offline
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Compression test results

I have a 1999 2.7L with 165,000 miles. Its throwing a p0300 and p0302 code (random misfire and misfire #2). The engine runs fine other than a little shaking when idling, which has been there since i bought the truck in 2007. So far i ran seafoam through the fuel tank and intake, cleaned the MAF, changed the plugs, wires, and swapped the coils to see if the misfire switched cylinders. No change. So i listened to the injectors with a stethoscope and they all sound good. Then I did a compression test and cylinders #1&2 were at 85psi, while #3&4 were at 210psi. According to my Haynes manual the max is supposed to be 178psi i believe. I did a wet test and 1&2 went to 95 and 100 respectively. My next step is to have a leak down test done, however i was wondering if anyone knew of anything else to do before the leak down test (trying to save money on the fix). I'm guessing its a head gasket due to the front two cylinders both being low. This is the first issue ive had with the truck; no noticeable miss, no overheating, no coolant loss or any other signs of a blown head gasket...
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Old 07-25-2014, 10:16 AM   #2
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I haven't had a chance to check the valve adjustment yet, but is it possible the unusually high compression on two cylinders and the low compression on the other two could be caused by bad valve adjustment?
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Old 07-25-2014, 10:35 AM   #3
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Could be burnt valves in those cylinders, but I'm not sure how to confirm that. Low compression is one symptom.

Its easy to check the valve clearances, but hard to change them (bucket and shim design).
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Old 07-25-2014, 02:20 PM   #4
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yea im going to get the leak down test done on monday.
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