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post #1 of 11 Old 08-17-2013, 11:04 PM Thread Starter
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Knock?

My truck was quite, ran hard a couple of times "WOT Runs" now I can hear a knocking sound that is constant at all rpms, loud at idle & louder under throttle.

Sounds slightly louder on drivers side.
When I let off the gas the injectors kill & you can still hear it, but it is muted somewhat untill idle then it gets louder.

Have not ran codes but no CEL.

Don't the injectors click off completely after you let off throttle? Or could an injector cause this kind of sound.
How loud is a rod or wrist pin?

No smoke.

I was running it hard to find weak links since this truck is gonna pull a lot of weight cross country. Guess I found one.

Truck history 1st owner towed a horse trailer fifth wheel with a jakebrake or ebpv brake setup , a chip & downpipe.

2nd owner would pull a utility trailer around.

230K miles & tranny finally going out.

So to me even though it was a work truck seems too me like they took care of it. To the best of my knowlage these trannys don't usualy go past 200K when towing so if tranny lasted this long, can it be possible the engine was abused?? Stupid question I know but I'm trying to figure if I'll be able to get another 200K outta this thing.

Here are some vids of the sound:


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post #2 of 11 Old 08-20-2013, 11:56 AM
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check your oil level.... start there....

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post #3 of 11 Old 08-20-2013, 12:08 PM Thread Starter
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Quote:
Originally Posted by GunnyRappUSMC View Post
check your oil level.... start there....
Oil is Good!
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post #4 of 11 Old 08-25-2013, 09:12 PM Thread Starter
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Knocking/Tapping

Ok pulled the passenger Valve cover "seemed to be where noise was coming from"


Video:


Injector spouts shooting out oil
Rockers seemed good

I pushed as hard as I can with my hands on the lifters/rockers & none of them compressed.

Turbo seemed slightly/minimumly dusted. "previously had a K&N"
No play in turbine wheel, very quiet when shut down so turbo bearings seem good.

Sending a oil sample to blackstone tommorow
Then doing a CCT & Buzz asap depending on results from oil.

If oil comes back good my toughts are

Injector Time or o rings at the least 235K miles orignal injectors I think
Fuel pressure low? Orig fuel pump I would guess
ICP has oil needs replacement
Exaust leak?
Still lingering on bad lifter I'm not sure pushing by hand is good enough to test them.

With oil results can a good test result rule out rod/wrist pin or bearings?

Whats your toughts?
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post #5 of 11 Old 08-25-2013, 09:53 PM
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Honestly - all in all - sounds fine to me?
Sounds just like mine. I'd say do the buzz test just to check the solenoids, but you may also want to get a compression test done if you think the motor's iffy'...

But, possible upgrades - if you're going to do more WOT stuff,
I'd definitely look at getting a Fuel Crossover + Fuel Pressure Spring Mod done (FRx Mod.)
Maybe even the High Pressure Oil cross over too (HPx mod.)
Otherwise - you'll confuse the known dead-head issue with what you think you may be hearing...

If you know someone that has access to AE (AutoEnginuity) - Buy them some dinner have them to a scan and datalog to see what the PCM sees.

Just my



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Last edited by AzPatMan; 08-25-2013 at 09:56 PM.
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post #6 of 11 Old 09-03-2013, 01:40 PM
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I think you starved an injector or two during your wot runs. Do a buzz test. At 236k miles they are typically getting close to their end of life. Sometimes they can last longer, some shorter.

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post #7 of 11 Old 09-05-2013, 04:14 PM Thread Starter
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Knock?

Quote:
Originally Posted by hucorey View Post
I think you starved an injector or two during your wot runs. Do a buzz test. At 236k miles they are typically getting close to their end of life. Sometimes they can last longer, some shorter.

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I'm thinking that too.

I still need a scan, ctt & buzz.

I think the only cuprits left are:
From Best To Worst Are

Fuel Pressure "Pump"
Rocker Arm OR Pushrod
Up Pipe Gasket
Injector(s)
HPOP Weak?

Either of the following I would just Do the heads while they are off & replace lifters.
Sticky Lifter
Valve

The only good news about that is that there is a headshop 2 blocks from where I work.

But I'm really feeling Injector, Lifter Or Gasket
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post #8 of 11 Old 09-05-2013, 05:59 PM
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#8 injector is a long lead injector(ae/ DS REAR), if it gets mixed up(like i did ) it will cause a knocking sound at idle,
think it is called the 7.3 crackle

usually gets mixed up when the seals/injector cups are replaced(how mine did)

but i read it wont hurt anything online,

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post #9 of 11 Old 09-06-2013, 01:53 PM
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Some live data logging is needed here. Try posting your location maybe someone with AE is close by, or if you plan on keeping the truck the AE is good investment with a quick payoff.

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post #10 of 11 Old 09-06-2013, 02:07 PM
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If the fuel pump is leaking does it seep down the side and start dripping from the oil bolt?
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