Engine Knock - Ford Powerstroke Diesel Forum
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Old 12-24-2013, 07:53 PM
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Engine Knock

01 7.3, cold air intake, ts 6 pos chip, 106k miles, posted here a few times but still havnt figured out my problem, im experiencing a knock around 1500-2000 rpm and only noticed it after I changed my oil last month, I put 15-40 in, im going to change oil again soon just to see if that's the problem probably put in 10-30 to see if anything changes, its been cold here lately..10 below, so far ive changed fuel filter, fuel pump, cps..unrelated, cleaned screens in fuel tank, cleaned ebps and tube. it seems as though its starving for fuel in that rpm range, slight fluctuation in idle rpm but barely noticable, and it seems worse the colder it gets, seems down on power and boost is lower, when I get on it its only at 15 max, put in bellowed up pipes due to a leak and that helped with the loss of power a bit but not completely. Im at my wits end with this problem, I sent it to a shop but they brushed it off as up pipes. any help would be greatly appreciated, im losing my mind with this truck
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Old 12-24-2013, 08:05 PM
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Have you tried a fuel additive that has anti gel properties?

Just throwing out something while I ponder on it.

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Last edited by RYanmas9; 12-24-2013 at 08:11 PM.
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Old 12-24-2013, 08:14 PM
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Yep, diesel kleen, white bottle and howes
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Old 12-24-2013, 08:30 PM
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The temp has been up and down, mostly down but some days in the 30s and it still does it
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Old 12-25-2013, 02:26 AM
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Do a CCT and buzz test and see what you get. If you have or know someone with AutoEnginuity, or you can use TorquePro app and do some data logging. It could be fuel filter related, worn out hpop, etc.

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Old 12-25-2013, 02:39 AM
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A knock at 1500 rpm that goes away after 2000 RPM is injector knock 99% of the time on the 7.3.

Try this, go up to highway speed where your torque convertor locks. Get to around 1700rpm or so, where you can hear the knock. Now let off and let the truck engine brake. If while engine breaking ( negative load on the engine) the knock goes away, it's injector knock and stop worrying about it.

Edit.... you've asked this before.... did you actually do what I said? I gave the same advice last time.

If your truck doesn't have an AE injector in #8 ( being an 01 it's a toss up), you are just experiencing injector knock like up 99-early 01 guys do. There's nothing worth doing about it. Mine knocks so loud when It's cold I can hear the knock from 50 meters away, has done it for as long as I've owned the truck. Your low boost is probably un related, sticking EBPV, or wastegate.

Last edited by schlutzer; 12-25-2013 at 02:55 AM.
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Old 12-25-2013, 04:31 AM
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Yep, I did the test and it goes away when I engine brake. Ill get a video up today to show what im hearing, maybe im describing it wrong. it sounds like in the powerband its starving for fuel
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Old 12-25-2013, 06:38 AM
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Nope. It's injector knock. If it goes away when you engine brake. It's just injector knock. The only fix is to buy and FRX from riffraff and an AE injector from Ford. And do the hutch mod.

Do you really want to spend 400$ to fix something that doesn't need to be fixed? All of us with trucks 99-early 01 do it to some degree. All it means is the injectors aren't brand new anymore, NOT that anything is worn out needing replacing.

Look else ware for your boost problem, sticky EBPV or weakwastegate like I said, or just simply a boost leak.
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Old 12-25-2013, 09:44 AM
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Schlutzer, im not trying to doubt you but it didn't do this 2 months ago, is that something that would just show up since winter hit

Last edited by dodgevillediesel; 12-25-2013 at 10:05 AM.
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Old 12-25-2013, 09:58 AM
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permissions are set so we can't see that video. At least i can't.

And yes, my truck is very minimal all summer but knocks like hell all winter, most 99-01 7.3's do to some degree.
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