Injector noise?? Need Help!
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Trailering
Joined: Jan 2023
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Injector noise?? Need Help!
All, i am having a strange “cackle” type sound coming from my 2000 7.3. I thought at first it might be related to my exhaust manifold leak on the drivers side. I have since replaced the old manifold and put motorcraft gasket and bolts. The noise is still present. I do not have any noticeable soot on the up pipes either. The sound appears to be coming from the drivers side. My truck is bone stock except for the Riffraff FRX I recently installed. The noise was present before and after the FRX. I’m certain this noise is not mechanical related (ie. rockers, push rods etc) since when driving down the road at 55mph coasting with no throttle the noise is gone and only present with light throttle. When accelerating hard it’s not noticeable. The truck has plenty of power and does not smoke or have mixing fluids. I’m at a loss. Please help! You can hear it especially when the rpms are around 1500 in the video.
Last edited by Rupert24; Oct 22, 2023 at 02:01 PM.
Lead Driver
Joined: Sep 2005
Posts: 9,399
Likes: 188
From: Norco,CA
I can't really here it in that video but when I had that it was injector number eight. I replaced it myself and it was good to go! Unplug one injector at a time and see if it goes away. I could really here mine in a parking structure!
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Trailering
Joined: Jan 2023
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I’m half wondering if I don’t have a manifold leak on the passenger side. Now that I’ve changed the driver side and he sound is reduced some. You have any experience with exhaust leaks on these trucks? If so, could it sound like this?
Lead Driver
Joined: Sep 2005
Posts: 9,399
Likes: 188
From: Norco,CA
No experience with exhaust leaks but people on here have. Most don't use gaskets because they don't last long. It is better to surface the manifold then use a gasket. But it won't hurt to change it if that's what you think it is. Put a hose up to you ear and listen to the manifold all over. If it's leaking you should be able to here it!
It's a Van Gogh
Joined: Feb 2010
Posts: 7,813
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From: Elk Grove, CA
Sounds like a bad injector to me. If so there should be some codes.
OTOH an easy check is to disconnect the 42 pin harness and crank it over. Listen for even, regular cranking speed. An uneven speed up could be bad compression on one or more cylinders.
OTOH an easy check is to disconnect the 42 pin harness and crank it over. Listen for even, regular cranking speed. An uneven speed up could be bad compression on one or more cylinders.
Hotshot
Joined: Dec 2012
Posts: 11,278
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From: Las Cruces New Mexico
Definitely a knocking sound, try to determine which side it is, then swap offending cylinder injector to another cylinder and see if the sound follows if it does obviously you have a bad injector, if not something on the bottom end is about to give.
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Joined: Mar 2005
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From: Hoschton,GA
I agree that is a bad injector. If you do not have access to a breakout box then just unplug each injector one at a time to determine which one is causing the knock.
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Trailering
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No codes, or compression issues. Also zero blow by on motor.
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Trailering
Joined: Jan 2023
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Here’s a crude video of me cruising. You can hear the knock/cackle/rattle type sound and it really appears to be injector related since when i let off the throttle and the injectors quit firing the noise stops. It really seems to be coming from the passenger side.
Lead Driver
Joined: Jul 2017
Posts: 6,864
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From: WV
Have you checked fuel pressure?
In tank mods been completed?
Air in fuel creates more noise in my opinion. Not saying that’s what’s going on but worth looking at before swapping injectors.
What part of WV you from? Not often I see another from “almost heaven” in the forum.
In tank mods been completed?
Air in fuel creates more noise in my opinion. Not saying that’s what’s going on but worth looking at before swapping injectors.
What part of WV you from? Not often I see another from “almost heaven” in the forum.
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Trailering
Joined: Jan 2023
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Have you checked fuel pressure?
In tank mods been completed?
Air in fuel creates more noise in my opinion. Not saying that’s what’s going on but worth looking at before swapping injectors.
What part of WV you from? Not often I see another from “almost heaven” in the forum.
In tank mods been completed?
Air in fuel creates more noise in my opinion. Not saying that’s what’s going on but worth looking at before swapping injectors.
What part of WV you from? Not often I see another from “almost heaven” in the forum.
We are in southern WV. Very close to the VA line.
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Trailering
Joined: Jan 2023
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The video definitely doesn’t do the noise justice. It’s much louder and prominent in person. Especially under light throttle at cruising speed.
Lead Driver
Joined: Sep 2005
Posts: 9,399
Likes: 188
From: Norco,CA
When my number 8 injector went bad there was no codes! I believe it was in the injector not electrical so no codes. I had the e 99 so no long lead injector either. I just put back in the same and problem solved.