Knocking noise...Valves?? - Ford Powerstroke Diesel Forum
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Old 02-03-2013, 07:41 PM
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Knocking noise...Valves??

My pickup started making a knocking noise this evening. I shut it off when I got to walmart after I let it cool down and when i got back out, started it up and drove home I noticed a kncoking noise. It only does it at idle when you first start it up and slowly fades away, but hwen you rev it up anywhere above idle it knocks. It it coming from the top of the motor as far as I could hear. I don't run my H&S on anything but stock and its only been deleted about 500 miles, only 4,700 miles on the pickup. Any experience with this? it's not the typewriter noise, I've got that too.
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Old 02-06-2013, 08:56 AM
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........bump
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Old 02-19-2013, 07:28 AM
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Ok, this is going to sound bad, but it worked for me, I had the same issue, u can go to ways, add another muffler( total2) or find a diesel cat from a 6.4 or 6.0 and install it before the muffler, during idle ur engine is not spooling the turbo and the valves are just flapping without any pressure, if u keep this up you will burn your valves, mine has 7k miles now with no problems ,
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Old 02-27-2013, 09:25 AM
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I put it all back to stock and it was still knocking just as loud...So it's at the dealer now.
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Old 03-11-2013, 04:05 PM
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Dealer replaced #7 injector and HPFP...didn't help, so they told me to drive it until it scattered.
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Old 03-11-2013, 07:22 PM
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haha! run it still it scatters? run it hard, make it happen! they will warranty it right?
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Old 03-11-2013, 08:06 PM
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Knocking noise...Valves??

Quote:
Originally Posted by Hunter69 View Post
Ok, this is going to sound bad, but it worked for me, I had the same issue, u can go to ways, add another muffler( total2) or find a diesel cat from a 6.4 or 6.0 and install it before the muffler, during idle ur engine is not spooling the turbo and the valves are just flapping without any pressure, if u keep this up you will burn your valves, mine has 7k miles now with no problems ,
Hmmmm. So ur saying idling will burn ur valves? I'm not challenging ur intelligence but I don't believe that. Sorry mate.


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Old 03-12-2013, 06:49 AM
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Quote:
Originally Posted by wilsonw2 View Post
Hmmmm. So ur saying idling will burn ur valves? I'm not challenging ur intelligence but I don't believe that. Sorry mate.


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if u remove the original exhaust and add a intake you will have no back pressure , therefore your valve seats will slam harder , at the end u will burn them. Ask a diesel engineer and see for yourself
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Old 03-12-2013, 01:43 PM
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Quote:
Originally Posted by csdwarf11 View Post
haha! run it still it scatters? run it hard, make it happen! they will warranty it right?
yea, I don't plan to run it too hard cause it got brand new toyo m/t's on it that arent cheap!
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Old 03-13-2013, 10:16 PM
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Quote:
Originally Posted by Hunter69 View Post
if u remove the original exhaust and add a intake you will have no back pressure , therefore your valve seats will slam harder , at the end u will burn them. Ask a diesel engineer and see for yourself
What valves are you burning? Because adding an intake INCREASES back pressure to the intake valves. Also, the rocker arms let the valves close slower at lower RPMs, so they really shouldn't be slamming all that hard.
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