Looking at 1st 7.3...knocking noise help - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 02-13-2013, 01:18 PM Thread Starter
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Looking at 1st 7.3...knocking noise help

I test drove my first 7.3 today and loved the truck...
everything drives near perfect, except it has a "knock" in the motor.
I asked the owner about it and he said that it is a flat spot that has developed in a lifter, I've never heard of anything like this?
Anybody got some insights to what this may be
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post #2 of 7 Old 02-13-2013, 02:22 PM
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im a beginner when it comes to diesels myself, but from my knowledge and what i've read you will have to determine if its a mechanical "knock" from the lower end or top end of the motor, or its an injector not firing correctly.

02 F250 7.3 Ext. Cab Long Bed
6637 DIY intake, muffler delete, EBPV delete, 6.0 cooler, ISSPRO gauges
285/75/16 BFG a/t's
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post #3 of 7 Old 02-13-2013, 03:02 PM Thread Starter
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ive done some searching and have found some information about cackle...this noise seemed like it was more from the passenger side...can you get injector noise from any injector or is it mainly 8 on the driver side
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post #4 of 7 Old 02-13-2013, 03:53 PM
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any injector can potentially fire incorrectly or stick open etc...from what i know, the #8 is more common to have problems because it gets the least amount of fuel to it..

02 F250 7.3 Ext. Cab Long Bed
6637 DIY intake, muffler delete, EBPV delete, 6.0 cooler, ISSPRO gauges
285/75/16 BFG a/t's
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post #5 of 7 Old 02-13-2013, 06:08 PM Thread Starter
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any insights to a lifter having a flat spot and causing the noise
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post #6 of 7 Old 02-13-2013, 07:16 PM
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Sound like he's not sure? How many miles on it? Service records? Service personally or by a shop? If at least have him drive it to a shop to have it looked over?

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post #7 of 7 Old 02-14-2013, 03:01 AM Thread Starter
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im gonnna take it to a shop today..its got 175kmiles...he's got some receipts for work done but nothin about the knock in the motor
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