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Old 01-12-2017, 12:34 AM
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compression test results

So I have a 2002 4.0 130k and I threw a misfire on 6. So I decided to pull plugs and do a compression test I ended up getting 1-155 2-160 3-160 4-165 5-170 6-160. I was wondering what you all think of this, the plugs (replaced this past summer) look like they have a little carbon build up on them but nothing too bad I'm thinking its probably from a vacuum leak I have. I haven't checked injectors yet but what would you think the best way to test the injectors would be (checking voltage or what else) and if so what voltage etc. would I be looking for? I would appreciate any feedback or suggestions thank you. For further information about how I tested all plugs removed coil rail unplugged, fuel pump relay pulled throttle at WOT, and crank for about 5 revolutions.

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Old 01-12-2017, 10:52 PM
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bump, I am also reading about 11.3 ohm's for each of my injectors i read it was supposed to be around 15 would someone be able to verify this?

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Old 01-12-2017, 11:43 PM   #3
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Originally Posted by wrangler0232 View Post
bump, I am also reading about 11.3 ohm's for each of my injectors i read it was supposed to be around 15 would someone be able to verify this?
Compression seems fine. My injectors all read 13.6 ohms but I think that if all the injectors are reading similar then they should be fine.
You could try pulling cylinder #6 spark plug and switching it with a spark plug from a different cylinder that you know is good. If it still misfires you can try doing the same with the injectors.
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Old 01-13-2017, 01:28 PM
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Compression seems fine. My injectors all read 13.6 ohms but I think that if all the injectors are reading similar then they should be fine.
You could try pulling cylinder #6 spark plug and switching it with a spark plug from a different cylinder that you know is good. If it still misfires you can try doing the same with the injectors.
That's what I was thinking hopefully it's just a plug
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