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Old 10-09-2013, 10:31 AM
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Dead cylinder/low compression guys come on in

Alright guys, latley my 2010 with mods in the sig 57k miles has developed that "thop thop thop" sound at idle. I know that is somewhat normal for these trucks but it seems a bit excessive. I am trying to diagnose it..

No burnt oil
No white smoke
No extra oil
No miss
No power loss
No hard start

I may be over thinking it but you can even here it when throttling. Noticed a couple days after the EGR delete. Hear it through the filter and tail pipe through the cab. Doesn't do it until it has been warmed up for 10 or so miles. The harder/longer the drives the louder it is. I know you lose compression once warmed up. Trying to avoid doing a compression test or going to the dealer.

Thoughts?

Thanks in advance.
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Old 10-09-2013, 11:29 AM
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Can you post a video of what you are talking about. It would be easier to diagnose if I / we could hear the sound.
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Old 10-09-2013, 11:32 AM
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I will when I get home. May have to email it as I only have a phone and I pad at home. Thanks for the reply.
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Old 10-09-2013, 01:21 PM
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If anything it sounds like you would have a bent pushrod. Not a dead cylinder
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Old 10-09-2013, 02:17 PM
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Quote:
Originally Posted by WoodBoy View Post
If anything it sounds like you would have a bent pushrod. Not a dead cylinder
That is what I'm thinking too....However, I would like to hear the noise before I jump conclusions. If it is a bent rod, it would be time to do a few upgrades.
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Old 10-09-2013, 03:47 PM
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I thought pushrods too but it only does it when it's warmed up. Do you guys normally do valve adjustment on these fords? Almost maybe once hot an exhaust valve or rocker is doing its expansion and staying open to long. I will have to try the vid tomorrow. Thanks for the input
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Old 10-09-2013, 05:35 PM
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There is no valve adjustment. Have you tried scanning for codes? We need a video or something
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Old 10-10-2013, 04:13 AM
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Thats good to hear. Sorry guys coming from a cummins; trying to figure out their differences. So with no valve adjustment I could pull the rockers and rods out this weekend and inspect... and just put them back in and tourque the rockers. Can you get the push rods on 7 and 8 out with cab on?

No codes at all. I will get a video today hopefully.
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Old 10-10-2013, 06:33 AM
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Yes rockers and pushrods can be done cab on.
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Old 10-15-2013, 08:37 AM
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Well guys I may have solved the issue. I noticed a little gray/black smoke. Probably white with black (looks gray mixed) on medium take offs. Thought maybe an injector was sticking. Ran a heafty amount of diesel clean through it last night and it runs/sounds a lot better. Hopefully it was just a sticky injector not atomizing. We will see.
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