Engine misfires
Lead Driver
Joined: Jan 2019
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From: N.W. Alabama
I believe they are trying to ask are you even getting the, all clear code, of 11 or 111, instead of not getting any at all, should at least get that. Have you tried removing one plug wire at a time, and see if it gets worse, or no change, have you pulled plugs and see how they look, or checked fuel pressure.
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Senior User
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Ok thanks, will do
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Senior User
Joined: Nov 2020
Posts: 101
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I believe they are trying to ask are you even getting the, all clear code, of 11 or 111, instead of not getting any at all, should at least get that. Have you tried removing one plug wire at a time, and see if it gets worse, or no change, have you pulled plugs and see how they look, or checked fuel pressure.
Did a compression test. They seem a little far spread from each other but let me know what you think. Here are the results:
#1: 145
#2: 120
#3: 140
#4: 130
#5: 130
#6: 125
#7: 120
#8: 130
Lead Driver
Joined: Jan 2019
Posts: 5,081
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From: N.W. Alabama
your border line low on #2, & #7, and border line above on #6, and this could cause a miss, when you get the chance and pull plugs take pics, and remember where they came from, miles on engine.
according to -->Part 1 -How to Test Engine Compression (4.9L, 5.0L, 5.8L)
according to -->Part 1 -How to Test Engine Compression (4.9L, 5.0L, 5.8L)
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your border line low on #2, & #7, and border line above on #6, and this could cause a miss, when you get the chance and pull plugs take pics, and remember where they came from, miles on engine.
according to -->Part 1 -How to Test Engine Compression (4.9L, 5.0L, 5.8L)
according to -->Part 1 -How to Test Engine Compression (4.9L, 5.0L, 5.8L)
Lead Driver
Joined: Oct 2016
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From: Houston/Sugar Land
The test that torq'ta sent you also has the "wet test" to see why your compression is low i.e. valves etc. I would run the first test again after you read it and verify your compression numbers. As pointed out several are borderline and hopefully you will get different results when you retest. If not different numbers do the wet test and see what it determines you need to do.
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Update: I did the wet compression test today, put about 2 tablespoons into the cylinder and ran it again. The compression didn’t change at all so that means the valve on cylinder #7 is leaking. I checked #2 and #6 and they were both at around 135 psi now. I don’t know if the compression fitting was lose when I did it the first time but they seem to be fine now. I’m rebuilding both cylinder heads anyways so it won’t matter. Thank you all for the help! I finally know the problem and will be fixing it ASAP!
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