Guess this racket!
Thread Starter
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Mountain Pass
Joined: Apr 2012
Posts: 170
Likes: 7
Guess this racket!
00 F250 338k auto
No error codes or warning lights (Forscan verified)
No smoke out of the exhaust
No oil or coolant leaks
Have banging noise from the motor
When cold truck sounds normal, quiet
When it warms up, the banging becomes audible
You can hear it at idle
You can hear it under acceleration
Frequency increases with RPM
When at speed, and letting off the throttle, noise goes away.....comes back when back on the throttle
Any time during driving when I let off, engine quiets down to normal
To me it sounds like exhaust leak, bur not sure how to check for those?
Help, thanks!
No error codes or warning lights (Forscan verified)
No smoke out of the exhaust
No oil or coolant leaks
Have banging noise from the motor
When cold truck sounds normal, quiet
When it warms up, the banging becomes audible
You can hear it at idle
You can hear it under acceleration
Frequency increases with RPM
When at speed, and letting off the throttle, noise goes away.....comes back when back on the throttle
Any time during driving when I let off, engine quiets down to normal
To me it sounds like exhaust leak, bur not sure how to check for those?
Help, thanks!
Thread Starter
|
Mountain Pass
Joined: Apr 2012
Posts: 170
Likes: 7
Truck runs great otherwise 19mpg mixed and no other issues
Tuned
Joined: Feb 2015
Posts: 333
Likes: 0
From: So. Ca
Banging??
If it was a gas engine, based on quiet when letting off, I'd say (& I know nothing),
to look at the wrist pins on the pistons.
BUT, this is Diesel, only 1-1/2 yrs under my belt.
So, with that in mind, I await all you guys opines on this.
If it was a gas engine, based on quiet when letting off, I'd say (& I know nothing),
to look at the wrist pins on the pistons.
BUT, this is Diesel, only 1-1/2 yrs under my belt.
So, with that in mind, I await all you guys opines on this.
Thread Starter
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Mountain Pass
Joined: Apr 2012
Posts: 170
Likes: 7
I considered wrist pin, or valve rocker, but those would still be spinning at 2000rpm when I let off the throttle at 70mph.....only thing that makes sense is that exhaust back pressure prevents the exhaust leak when you let off the gas
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Cargo Master
Joined: Jun 2010
Posts: 2,113
Likes: 4
From: Iowa
I'm not going to say it couldn't be an exhaust leak but wouldn't an exhaust leak that could make a bang/tick cause a boost issue or at least a massive exhaust leak under boost? It would have to be pre-turbo.
I seem to recall a thread recently that the injector hold down bolt/stud wasn't loose but actually bent letting the injector move....
I seem to recall a thread recently that the injector hold down bolt/stud wasn't loose but actually bent letting the injector move....
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Thread Starter
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Mountain Pass
Joined: Apr 2012
Posts: 170
Likes: 7
I mostly run near full fuel tank. Know well the noise it makes when getting low and air in the lines. It does sound like that.
I have done hutch before, I'll try it here too...and sending unit is acting up maybe fix that as well while in there.
I have done hutch before, I'll try it here too...and sending unit is acting up maybe fix that as well while in there.