Dreaded Sounds!

[Jay159866]

I started my car up yesterday to hear this knocking sound. I shut it off, checked oil and went ahead and replaced SC oil since I'm around 5K miles on it. You can't hear the knock at the back of the engine and it sounds like it's coming from the bottom front of the engine. It DOESN'T increase or decrease with RPM in neutral. I did a datalog and revved to 6K, no knock is picked up by the sensors. Any ideas?
New oil is on the way with a oil analyst kit.

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[Jay-rod427]

What do you mean it doesn't increase or decrease with rpm? Like it doesn't get louder, or it doesnt increase in frequency matching the rpm?

 

[Jay159866]

What do you mean it doesn't increase or decrease with rpm? Like it doesn't get louder, or it doesnt increase in frequency matching the rpm?

Both. It's hard to hear due to the blower but it seems to not increase or get louder. I'm gonna jack the front up when I get off work and do a rev wirh the camera under the car.

 

[GuardGT]

ive had a belt tensioner knock around like that, worth a look. hope its an easy fix

 

[FIVE_LITER]

Do the Paxton's have a stand alone belt for the supercharger? If they do I'd take that off to help quiet things down to make it easier to find.

 

[Phoenix]

ive had a belt tensioner knock around like that, worth a look. hope its an easy fix

my money is on a tensioner.

 

[Jay159866]

I'm going to mess with it today. Is there anyway to test the tensenior?
I unplugged the coils, checked compression (215-230 on all cylinders) and turned it over a few times, don't hear the knocking.

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