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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
how to do a compression test
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<blockquote data-quote="acrbill" data-source="post: 12992580" data-attributes="member: 64379"><p>Thanks bro. Some things I will add.</p><p></p><p>Disconnect the fuel harness in the trunk and then start the car to let the pressure release. I didn't do this and all my plus were wet with gas so it was harder to get a read on them. </p><p></p><p>When doing the rear most passenger side be sure to be mindful of the positive battery terminal, if you hit it there is a good change you will blow the power steering fuse. I heard about this and can see why it would happen. </p><p></p><p>For those wondering all my cylinders were between 170-176 with #8 being the strongest. I worked on the drivers side starting at the front and moving back. The first two read 167 and after the rest of the cylinders read in the 170s I retested and got 172 in both. </p><p></p><p>I have primarily been running the AED auto lopey idle tune for those who may be concerned about the tunes affects on the motor.</p></blockquote><p></p>
[QUOTE="acrbill, post: 12992580, member: 64379"] Thanks bro. Some things I will add. Disconnect the fuel harness in the trunk and then start the car to let the pressure release. I didn't do this and all my plus were wet with gas so it was harder to get a read on them. When doing the rear most passenger side be sure to be mindful of the positive battery terminal, if you hit it there is a good change you will blow the power steering fuse. I heard about this and can see why it would happen. For those wondering all my cylinders were between 170-176 with #8 being the strongest. I worked on the drivers side starting at the front and moving back. The first two read 167 and after the rest of the cylinders read in the 170s I retested and got 172 in both. I have primarily been running the AED auto lopey idle tune for those who may be concerned about the tunes affects on the motor. [/QUOTE]
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how to do a compression test
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