Is this an Engine Knock?
Thread Starter
|
Freshman User
Joined: Mar 2016
Posts: 32
Likes: 0
From: Houston, Tx
Is this an Engine Knock?
The is my 7.3L running. I just bought it so I'm getting used to the sound. The engine seems to run ok but it got a really loud knocking sound that I'm not sure is normal. I wanted to get a second opinion. What do you think?
If this is normal what the heck could it be? Its not the sound the injectors make that's for sure. And it doesn't sound like normal combustion either.
If this is normal what the heck could it be? Its not the sound the injectors make that's for sure. And it doesn't sound like normal combustion either.
Thread Starter
|
Freshman User
Joined: Mar 2016
Posts: 32
Likes: 0
From: Houston, Tx
125,000 miles. The right bank of injectors have 2,000 miles on them. Oil is Rotella I forgot the weight. The dealer did an oil change after replacing the injectors.
Thread Starter
|
Freshman User
Joined: Mar 2016
Posts: 32
Likes: 0
From: Houston, Tx
Thanks for the info. I'm guessing I need to stop driving the truck now right?
Whats my diagnostic procedure from here on out? Start with the easiest and work my way down the list? Maybe unplug each injector with it running to isolate a cylinder? Or test fuel pressure?
Whats my diagnostic procedure from here on out? Start with the easiest and work my way down the list? Maybe unplug each injector with it running to isolate a cylinder? Or test fuel pressure?
Cargo Master
Joined: Nov 2010
Posts: 2,797
Likes: 10
If the dealer put those in id have them be fixing the issue on their dime and time... Yes that sure sounds like injector knock, sometimes the audio on phones make it sound louder than it is. If that was a cold start and it disapates then there shouldn't be anything to worry about. is this right after the injectors were installed? How many miles since install?
They should warranty parts and labor if they did the work.
If you did loose you mechanical pump. Get a new one here for 100$. http://www.riffraffdiesel.com/mechan...uel-lift-pump/ It will take all of an hour for a first timer to install.... the dealer will be upwards of 400$ to do the work...
They should warranty parts and labor if they did the work.
If you did loose you mechanical pump. Get a new one here for 100$. http://www.riffraffdiesel.com/mechan...uel-lift-pump/ It will take all of an hour for a first timer to install.... the dealer will be upwards of 400$ to do the work...
Trending Topics
Senior User
Joined: Oct 2015
Posts: 320
Likes: 8
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Cargo Master
Joined: Nov 2010
Posts: 2,797
Likes: 10
- Low fuel pressure, no fuel pressure, air in fuel
- Air in HPOP system after an injector swap
- Internal injector failure
- A broken nozzle which will cause the truck to emit an enormous amount of white smoke
- Cylinder Temperature
- Oil viscosity
These will all cause what some call injector knock or clack, or a dieseling clack. 90% of the time its a fuel or oil delivery issue if not related to a cold start.
I'm sure some will add more
Thread Starter
|
Freshman User
Joined: Mar 2016
Posts: 32
Likes: 0
From: Houston, Tx
If the dealer put those in id have them be fixing the issue on their dime and time... Yes that sure sounds like injector knock.
They should warranty parts and labor if they did the work.
If you did loose you mechanical pump. Get a new one here for 100$. Replacement Mechanical Fuel Lift Pump Ford Powestroke 7.3L 94-97 It will take all of an hour for a first timer to install.... the dealer will be upwards of 400$ to do the work...
They should warranty parts and labor if they did the work.
If you did loose you mechanical pump. Get a new one here for 100$. Replacement Mechanical Fuel Lift Pump Ford Powestroke 7.3L 94-97 It will take all of an hour for a first timer to install.... the dealer will be upwards of 400$ to do the work...
I drove the truck back with this knock because I thought that's just how they sound but then became concerned after hearing one that didn't sound like mine. I hope I didn't do irreversible damage to the engine. I'm replacing my DMF right now so to have to do an engine as well would really hurt my wallet.
Here's an update: Changed Auxilary fuel filter. No change in sound. Ordering a fuel pressure guage next.
Thread Starter
|
Freshman User
Joined: Mar 2016
Posts: 32
Likes: 0
From: Houston, Tx
Well there are many causes outside of the electrical components.
These will all cause what some call injector knock or clack, or a dieseling clack. 90% of the time its a fuel or oil delivery issue if not related to a cold start.
I'm sure some will add more
- Low fuel pressure, no fuel pressure, air in fuel
- Air in HPOP system after an injector swap
- Internal injector failure
- A broken nozzle which will cause the truck to emit an enormous amount of white smoke
- Cylinder Temperature
- Oil viscosity
These will all cause what some call injector knock or clack, or a dieseling clack. 90% of the time its a fuel or oil delivery issue if not related to a cold start.
I'm sure some will add more
Post Fiend
Joined: Dec 2009
Posts: 15,505
Likes: 18
From: Livoina,La
Low fuel psi, air in fuel system or loose injector causing injector knock will damage the injector.