Rattling and knock sensors... - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

tramtwo · 02-08-2012, 05:07 PM

Until I can hunt down this damn non stop rattling from the rear

can the knock sensors be safely tuned out?

After a fuse pull (5 and 22) the car runs like a raped ape

until I drive about two blocks down my bumpy street and then the performance drops off tremendously.

I have the SCT X3 from JRE.

POWERFREAK · 02-08-2012, 05:09 PM

you don't want to turn knock sensors off

tramtwo · 02-08-2012, 05:18 PM

Quote:

Originally Posted by POWERFREAK

you don't want to turn knock sensors off

Ok, how about turning them down? The rattle is NOT cause by the exhaust and is proving to be a real mutha hunting down.

POWERFREAK · 02-08-2012, 06:32 PM

Talk to your tuner. Are you sure that's the problem? I'm no tuning expert, but I've never heard of that happening (and the roads around here really suck). The fuse pull is just resetting the fuel trims, it's not like it's a permanent power-adder. I would figure out where the rattle is coming from though.

Zman12 · 02-08-2012, 06:41 PM

Fix the problem, if you turn the knock sensors off you will regret it because then you will never find the actual cause, and then you will have a real issue and it will be too late.

PQ · 02-08-2012, 06:48 PM

Quote:

Originally Posted by POWERFREAK

Talk to your tuner. Are you sure that's the problem? I'm no tuning expert, but I've never heard of that happening (and the roads around here really suck). The fuse pull is just resetting the fuel trims, it's not like it's a permanent power-adder. I would figure out where the rattle is coming from though.

You need to find it. It can even happen after a tune because the Knock Sensors are constant and super fast. So if the condition persists then the car will be dumbed down until the cause is taken care of.

Need proof.

http://www.camaro5.com/forums/showth...=105015&page=2

SC2150 · 02-08-2012, 08:13 PM

Knock sensors are your friend.....look at the "piston carnage" thread for pics of what CAN happen if messed with. Now if your only running on the track and your 110% sure the tune is correct then we turn them off for consistancy, but that is VERY controlled conditions, fuel, tune, etc.

What catchcan are you running? Most let enough oil through to still cause detonation. ANY oil ingestion into the intake air charge is detrimental.

tramtwo · 02-08-2012, 08:19 PM

Quote:

Originally Posted by SC2150

Knock sensors are your friend.....look at the "piston carnage" thread for pics of what CAN happen if messed with. Now if your only running on the track and your 110% sure the tune is correct then we turn them off for consistancy, but that is VERY controlled conditions, fuel, tune, etc.

What catchcan are you running? Most let enough oil through to still cause detonation. ANY oil ingestion into the intake air charge is detrimental.

Rx

IndeedSS1 · 02-09-2012, 04:13 PM

How much knock are you seeing when you scan? And do you see the knock show up when you hear the rattles? Does the power drop like this when you are on the stock tune?...Just curious

tramtwo · 02-09-2012, 04:19 PM

Quote:

Originally Posted by IndeedSS1

How much knock are you seeing when you scan? And do you see the knock show up when you hear the rattles? Does the power drop like this when you are on the stock tune?...Just curious

Great questions, I have just begun trying to deal with this. The dealer can't find the rattle, blames my muffler delete.

I have had it in the air and cant find it either. The rattle is only present going over bumps, and small bumps at that, sounds like the driver side rear.

This is where I am at in the process.

Search 'rattle' on this site and about a thousand threads are returned.

Phantom.5SS · 02-09-2012, 05:39 PM

Loose brake pad????

Tap lightly on some things with a RUBBER malet...could be a heat shield as well?

PQ · 02-09-2012, 05:42 PM

My rotor shield in the rear came lose and was rattling.

But you are right. It could be a TON of things.

tramtwo · 02-09-2012, 05:44 PM

Thanks checked all the easy obvious stuff think I would have found it by now. I just don't have enough knowledge about the suspension setup to know what I am looking at.

The fact is that it is loud enough to trip knock sensors and have the car running like crap.

PQ · 02-09-2012, 05:53 PM

Having chased down a few noises on my car I get your frustration.

Took me a while to find them.

Used a set of Chassis Ears on my suspension to find one.

Do you have any aftermarket suspension mods?

02-08-2012, 05:07 PM	#1
tramtwo Drives: 2021 1LE Join Date: Jul 2011 Location: N'Awlinz Posts: 6,315	Rattling and knock sensors... Until I can hunt down this damn non stop rattling from the rear can the knock sensors be safely tuned out? After a fuse pull (5 and 22) the car runs like a raped ape until I drive about two blocks down my bumpy street and then the performance drops off tremendously. I have the SCT X3 from JRE.

02-08-2012, 05:09 PM	#2
POWERFREAK I.AM. Drives: 2011 2SS/RS/A6 cammed-n-whippled Join Date: Oct 2008 Location: NY Posts: 2,637	you don't want to turn knock sensors off __________________ https://FeelingCreativeBlog.com

02-08-2012, 06:32 PM	#4
POWERFREAK I.AM. Drives: 2011 2SS/RS/A6 cammed-n-whippled Join Date: Oct 2008 Location: NY Posts: 2,637	Talk to your tuner. Are you sure that's the problem? I'm no tuning expert, but I've never heard of that happening (and the roads around here really suck). The fuse pull is just resetting the fuel trims, it's not like it's a permanent power-adder. I would figure out where the rattle is coming from though. __________________ https://FeelingCreativeBlog.com

02-08-2012, 06:41 PM	#5
Zman12 Drives: 2010 Camaro 2SS Join Date: May 2011 Location: Gardner,Ks Posts: 490	Fix the problem, if you turn the knock sensors off you will regret it because then you will never find the actual cause, and then you will have a real issue and it will be too late. __________________ Whipple,custom cam,CAI,Kooks,Pedders and PFADT 626RWHP 549TQ ..

02-09-2012, 04:13 PM	#9
IndeedSS1 Drives: 2010 Camaro SS LS3 Join Date: Sep 2010 Location: Eastern MO Posts: 3,786	How much knock are you seeing when you scan? And do you see the knock show up when you hear the rattles? Does the power drop like this when you are on the stock tune?...Just curious __________________ She is only memory now.

02-08-2012, 08:13 PM	#7
SC2150 Account Suspended Drives: 2012 Camaro RS, RX supercharged Join Date: Dec 2009 Location: Bradenton, FL Posts: 6,063	Knock sensors are your friend.....look at the "piston carnage" thread for pics of what CAN happen if messed with. Now if your only running on the track and your 110% sure the tune is correct then we turn them off for consistancy, but that is VERY controlled conditions, fuel, tune, etc. What catchcan are you running? Most let enough oil through to still cause detonation. ANY oil ingestion into the intake air charge is detrimental.

02-09-2012, 05:39 PM	#11
Phantom.5SS Hell yeah I'm Guilty..... Drives: 2010 2-SS ABM NON-RS Join Date: Nov 2009 Location: Colonie, NY Posts: 1,223 View My Garage	Loose brake pad???? Tap lightly on some things with a RUBBER malet...could be a heat shield as well? __________________

02-09-2012, 05:42 PM	#12
PQ Booooosted. Drives: 2010 Supercharged SS Join Date: Apr 2008 Location: Mobile, AL Posts: 36,717 View My Garage	My rotor shield in the rear came lose and was rattling. But you are right. It could be a TON of things. __________________

02-09-2012, 05:44 PM	#13
tramtwo Drives: 2021 1LE Join Date: Jul 2011 Location: N'Awlinz Posts: 6,315	Thanks checked all the easy obvious stuff think I would have found it by now. I just don't have enough knowledge about the suspension setup to know what I am looking at. The fact is that it is loud enough to trip knock sensors and have the car running like crap.

02-09-2012, 05:53 PM	#14
PQ Booooosted. Drives: 2010 Supercharged SS Join Date: Apr 2008 Location: Mobile, AL Posts: 36,717 View My Garage	Having chased down a few noises on my car I get your frustration. Took me a while to find them. Used a set of Chassis Ears on my suspension to find one. Do you have any aftermarket suspension mods? __________________

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Engine Knock 3.6L	DjfunkmasterG	Camaro Issues / Problems \| Warranty Discussions \| TSB and Recalls	52	08-01-2011 11:40 AM