knocking.. - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 02-20-2014, 02:47 PM Thread Starter
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Question knocking..

Ok gyuros lol

1999 7.3. Had a injector replaced. Mechanic said no other injectors was bad. Compression test was ok.. he cut down one cylinder at a time and knock was still there. Ive tried using diesel clean and 4cyc oil in the gas. No help. Was told the starter could be going bad and broke a tooth but doesnt seem right . Truck runs fine. No smoke no hickups no nothing. Hauls what i need to haul or drives like normal. Knock can be heard at any rpm. Ive read the ads on fpr and mechanical fuel motor etc. Ill check that this weekend. So any options ? Im at a point i cant afford a motor tear down to figure out the problem.. full oil full gas. New fuel filter a month ago.

Keep in mind im no.mechanic by any means so im very dumb founded but like to do as much as i can on my own. To save as much money as i can but yet learning about this beast as usual

F250 PowerStroke 7.3 turbo diesel 4x4
extra cab long wheel base
2" lift with 18" with 35's on them
banks exhaust / torque system
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post #2 of 12 Old 02-21-2014, 09:24 AM
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When you're driving at highway speeds and take your foot off the throttle, is the noise still there?

2005 F250 CCSB FX4 6.0
2003 Excursion 6.0 4WD
1997 F350 CCLB 4WD 7.3
1996 F250 SCLB 4WD 7.3
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post #3 of 12 Old 02-21-2014, 12:55 PM Thread Starter
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Question

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Originally Posted by duck fan View Post
When you're driving at highway speeds and take your foot off the throttle, is the noise still there?
Yes sir. It does but has no power loss or performance loss.

F250 PowerStroke 7.3 turbo diesel 4x4
extra cab long wheel base
2" lift with 18" with 35's on them
banks exhaust / torque system
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post #4 of 12 Old 02-24-2014, 08:30 AM
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Knocking when off the throttle at highway speeds is most likely not fuel related as in that case, the injectors are off. I would pull the valve cover and double check the torque on all the rocker pedestals and injector hold down bolts. The one other thing that comes to mind is a cracked flexplate but checking that involves dropping the transmission.

2005 F250 CCSB FX4 6.0
2003 Excursion 6.0 4WD
1997 F350 CCLB 4WD 7.3
1996 F250 SCLB 4WD 7.3
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post #5 of 12 Old 02-24-2014, 01:30 PM Thread Starter
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Quote:
Originally Posted by duck fan View Post
Knocking when off the throttle at highway speeds is most likely not fuel related as in that case, the injectors are off. I would pull the valve cover and double check the torque on all the rocker pedestals and injector hold down bolts. The one other thing that comes to mind is a cracked flexplate but checking that involves dropping the transmission.
Checking the flexplate thia weekend. Also being told could be a thing on the bottom of the piston. Cant remember the name. But from the mechanic he said its not a rod not a valve not a injector. But qithout a tear down to see he was down to one of two options. But no ppwer loss no smoke no nothing for now.... but popping the hood aounds like its the back left but in the cab it sounds like the floor board area. But im dumb on this things.

So dunno
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post #6 of 12 Old 02-24-2014, 07:11 PM
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Is it speed or RPM dependent?

2005 F250 CCSB FX4 6.0
2003 Excursion 6.0 4WD
1997 F350 CCLB 4WD 7.3
1996 F250 SCLB 4WD 7.3
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post #7 of 12 Old 02-24-2014, 07:24 PM Thread Starter
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[QUOTE=duck fan;8356657]Is it speed


Seems to work with the rpm's. Granted it will go up n down with the speed of the motor. Nosie level stays the same. But does adjust to the rpms

F250 PowerStroke 7.3 turbo diesel 4x4
extra cab long wheel base
2" lift with 18" with 35's on them
banks exhaust / torque system
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post #8 of 12 Old 02-24-2014, 07:58 PM
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Take some videos to post on youtube and link to here.
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post #9 of 12 Old 02-26-2014, 09:06 AM Thread Starter
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Originally Posted by steve604 View Post
Take some videos to post on youtube and link to here.


Will try to get that posted up this weekend

F250 PowerStroke 7.3 turbo diesel 4x4
extra cab long wheel base
2" lift with 18" with 35's on them
banks exhaust / torque system
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post #10 of 12 Old 02-26-2014, 09:07 AM Thread Starter
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Quote:
Originally Posted by duck fan View Post
Is it speed or RPM dependent?
Hey duck fan yes this is throttle based knock. But sounds like its coming from the floor board. Or with the hood up its back left of the motor. Making me think its that fly wheel

F250 PowerStroke 7.3 turbo diesel 4x4
extra cab long wheel base
2" lift with 18" with 35's on them
banks exhaust / torque system
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