Have you had false knock and solved the issue?

[Joe 5.0]

As the title states, have any of you ever dealt with false knock and ended up resolving it? I'm trying to figure out where to look. I get false knock throughout the RPM range when I go WOT, and it's driving me crazy.

I'm aware that the exhaust system is typically the issue, but after looking over my entire exhaust system, I don't see any rubbing. As for the A/C bracket bolt, I cut it off with a hack saw, so it shouldn't be touching my StainlessWorks headers.

One thing I can think of is the inlet tube for my JLT intake--the tube that connects to the stock grill and that enters the airbox is loose. Maybe that's it?

Help!

SEE POST #10 FOR VIDEO

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[Kong76]

Absolute Bitch trying to find false knock.

 

[BmacIL]

Yes, on mine only caused by super quick shifts. No, haven't solved it. It's related to the quantity of engine roll since I can hear something hitting/briefly rattling right after going WOT after the upshift.

 

[Keo_S550]

Add octane booster and see if it gets rid of it. I run 93 and add a can of octanium. Before I added octanium I would get knock some occasions.

 

[BmacIL]

Add octane booster and see if it gets rid of it. I run 93 and add a can of octanium. Before I added octanium I would get knock some occasions.

Octanium would fix real knock not false knock.

 

[Keo_S550]

Octanium would fix real knock not false knock.

OP said he gets “false” knock throughout the RPM range during WOT. Sounds like real knock to me. False is during shifts.

 

[BmacIL]

OP said he gets “false” knock throughout the RPM range during WOT. Sounds like real knock to me. False is during shifts.

I'd agree, but it can still be false. If he tries octanium 100 octane or E85 and is still getting knock, it's false.

 

[Joe 5.0]

I'll give E85 a try again. However, I'm convinced it's false knock, and it's driving me nuts.

If I'm light on the throttle going up the RPM range, the car feels great. If I stomp on it, it feels like a dud.

Aside from the A/C bracket bolt, exhaust and exhaust clamps, etc., I'm out of places to look.

I just don't get it. It's incredibly frustrating when you mod your car to be faster, but it doesn't run optimally.

 

[sabtaj1]

Did you use mostly all the factory studs when doing the headers? Ive heard of people using them and they may touch on certain tubes of the header causing false knock...

 

[Joe 5.0]

Could this be the knock? Banging on the xpipe with a rubber mallet. The clamps are tight, but it looks like the xpipe isn’t shoved in all the way (look on right side of video).

 

[db252]

Had a friend dealing with false knock for a long time with his Roush setup that he nor I installed. He upgraded to a Whipple gen5 that I did install and during disassembly, this was in the engine valley. Needless to say, we didn’t leave it there and he’s had no false knock since the new install. No way I’d say this is a problem someone has and it was a first for me to see. A metal ping pong ball right where the knock sensors are.

 

[Joe 5.0]

Had a friend dealing with false knock for a long time with his Roush setup that he nor I installed. He upgraded to a Whipple gen5 that I did install and during disassembly, this was in the engine valley. Needless to say, we didn’t leave it there and he’s had no false knock since the new install. No way I’d say this is a problem someone has and it was a first for me to see. A metal ping pong ball right where the knock sensors are.

Might as well hold the knock sensors in your hand while driving and shake them on a WOT pull. That’s crazy. Glad you discovered and fixed the issue!

 

[Joe 5.0]

Bump. Still suffering.

Thinking of buying BMR motor mounts to either raise or lower the motor to try and make the knock go away.

 

[Nuked]

Do you park your car over the winter? When I removed my stock intake manifold to install the 18 on it, there were nuts that some critter decided to stash in there over winter. May be something to consider especially if you park it outside.

 

[Joe 5.0]

Do you park your car over the winter? When I removed my stock intake manifold to install the 18 on it, there were nuts that some critter decided to stash in there over winter. May be something to consider especially if you park it outside.

I drive it from time to time in the winter. It's stored in the garage when not being driven. Definitely something to consider!

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