Weird knock under load

[chevyfs]

I can't tell what's going on in the video, but a knocking or rattling under load is often just detonation, AKA spark knock or ignition knock.

If it's actually rod knock or something else major, it will usually make the noise while reving just in park or neutral too.

Thats what i was thinking as well. Would the the timing vaccum not being hooked up cause a spark knock?

 

[AuroraGirl]

Thats what i was thinking as well. Would the the timing vaccum not being hooked up cause a spark knock?

That would be a great way to have an incorrect timing but too r-tarded, so it would be driveabilty mess. not sure how likely to make a nosie but im guessing some

 

[80BrownK10]

I can't tell what's going on in the video, but a knocking or rattling under load is often just detonation, AKA spark knock or ignition knock.

If it's actually rod knock or something else major, it will usually make the noise while reving just in park or neutral too.

My first thought was spark knock too just by his description. I have not watched the videos though. My work F150 is a 2020 with the 5.0 and that is the most spark knockingest thing I have ever driven. Underload when low in the rpm range it will go to town.

 

[80BrownK10]

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In the video you can hear the engine in idle, then in gear under load spinning tires, then me starting the truck after it stalled, then it also goes into an extremely low idle after warmed up. Now that its low on gas it sounds worse or the knock is just getting worse

That for SURE IS NOT SPARK KNOCK!! Something in that engine is about to let go. Possibly leading to a window mod to the block. I would pull that motor and or swap it with another one.

 

[Dave M]

I reckon first up I would drop the torque convertor cover and have a visual inspection there. Process of elimination.

 

[AuroraGirl]

I would also say dont discount a ground out of a non critical comonent that isnt obvious or seemingly likely source.

 

[bucket]

That for SURE IS NOT SPARK KNOCK!! Something in that engine is about to let go. Possibly leading to a window mod to the block. I would pull that motor and or swap it with another one.

I agree, that last video tells a lot. That's an 'all the time' noise and not a noise just under load.

The engine seems to have a pretty good miss in it too. So it is possible that the shake is causing something loose (like torque convertor bolts) to make one heck of a racket. But it's also very likely that something internal is about to let go and that is the reason for the miss.

That last video really sounds like an engine that is about to go kablooey.

 

[chevyfs]

I agree, that last video tells a lot. That's an 'all the time' noise and not a noise just under load.

The engine seems to have a pretty good miss in it too. So it is possible that the shake is causing something loose (like torque convertor bolts) to make one heck of a racket. But it's also very likely that something internal is about to let go and that is the reason for the miss.

That last video really sounds like an engine that is about to go kablooey.

It makes zero noise in park thats just whats ******* with me

 

[AuroraGirl]

It makes zero noise in park thats just whats ******* with me

neutral too? If not in neutral it would be your transmission then when the park lever or internal mechanisms for park are engaged differently. is your shifter adjusted

 

[chevyfs]

neutral too? If not in neutral it would be your transmission then when the park lever or internal mechanisms for park are engaged differently. is your shifter adjusted

it doesn't make the noise in neutral either, and my shifter is a little finicky, when i try to go into reverse i have to wiggle the shifter around a little in order to get into reverse sometimes. and one time i went to shift and the indicator didn't move at all but the shifter moved, then it slapped into place.

 

[SquareRoot]

LS Swap! Don't forget the cats, nobody likes a stinky engine. Or, it could be a cracked flexplate. I had that happen and it sounds exactly like you're describing. Since you'll have to pull the trans, you might as well have that LS standing by.

 

[chevyfs]

LS Swap! Don't forget the cats, nobody likes a stinky engine. Or, it could be a cracked flexplate. I had that happen and it sounds exactly like you're describing. Since you'll have to pull the trans, you might as well have that LS standing by.

would my flex plate or Tc also cause my engine to crank slow when i try to start it?

 

[AuroraGirl]

would my flex plate or Tc also cause my engine to crank slow when i try to start it?

you saying the thign about the shifter is the exact thing you should be focused on, you said its not in neutral but it is park. the shifter is wobbly and doesnt feel proper.

Sounds like the shifter valve thing that controls the shifts and stuff in relation to the internals.. i would go under your truck and maybe give it a wiggle or disconnect the shifter and see how it moves one way and another. i dont know what it should feel like without the shifter in link, but it shouldnt be loosey goosy crunch crunch if that helps.

 

[chevyfs]

you saying the thign about the shifter is the exact thing you should be focused on, you said its not in neutral but it is park. the shifter is wobbly and doesnt feel proper.

Sounds like the shifter valve thing that controls the shifts and stuff in relation to the internals.. i would go under your truck and maybe give it a wiggle or disconnect the shifter and see how it moves one way and another. i dont know what it should feel like without the shifter in link, but it shouldnt be loosey goosy crunch crunch if that helps.

it doesn't make a noise in park or neutral

 

[AuroraGirl]

Is your TV cable adjusted properly? you said noises and stuff, and I realize your 4.3v6 probably has a 700r4. Is your carburetor stock?