Rod? Lifter? Exhaust? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Jbaker901atu · 02-11-2015, 10:05 PM

Recently purchased a 2011 v6 camaro standard from a dealer. Has 45k miles. Noticed a very subtle but rapid low pitched knocking. Soundo like it's coming from the glove box area of passenger side and almost impossible to hear outside of the car, you really need to be in cabin. I don't hear it when I accelerate and It doesn't matter in the ac/heater is on or not. Did the old screwdriver to block trick and didn't hear any enhancement. Still owe 10k. On it so I'm freakin out a little. Still under powertrain warranty for a year. Thank you.

Jbaker901atu · 02-11-2015, 10:06 PM

Also, it's on and off. Don't hear it all the time and can only hear it when it's quiet, like at night. Took it to local dealer, he said he doubts it's a lifter or rod. Thinks it is either exhaust or catalytic issue

SmokinCarrot · 02-11-2015, 10:32 PM

Don't know but I'll "bump" the question. Good luck.

Stealthpanda · 02-11-2015, 11:04 PM

There is a subtle, but noticeable, tick from the direct injection for 2010 and 2011 model LLTs. I think when the LFX came out they had found a "way" to reduce the ticking sound. Need a video to know if its a tick, knock, or squirrel living inside your valve cover.

Jbaker901atu · 02-11-2015, 11:15 PM

It's not the injector tick, that worried me at first.. it's so subtle not sure if my phone could pick it up.. more of a woodpecker sound.. much deeper than the injector tick

Jbaker901atu · 02-11-2015, 11:16 PM

I noticed it more when my car is decelerating, but the speed of the knock doesn't seem to change

omgitsmiketuck · 02-11-2015, 11:18 PM

my car has a ticking sound as well, but I've established its related to my AC. one of the bearings on one of my cabin fans is starting to go, and it ticks when at low speed. prolly not the same issue, but food for thought. seems like they used cheap fans in our AC.

Stealthpanda · 02-11-2015, 11:21 PM

I do think the screwdriver trick would apply to something loose/moving under the valve cover. If this isn't engine related, it could be something with a pulley/belt/accessory related. The fans, as mentioned above.

Jbaker901atu · 02-11-2015, 11:32 PM

Ok i appreciate the feedback... also, realistically, how likely is it for a ride with 45k on it to have a bad lifter/rod? This car showed no signs of abuse either. No pedal wear, no curb scrapes... nice tight clutch. Got it for a steal too. 16,500

Jbaker901atu · 02-12-2015, 12:30 AM

Bump

Gee · 02-12-2015, 07:30 AM

Not trying to flame at all but, Video! How can we help you with a sound that we cannot hear? Thats like listening to a lady describing art via the radio then trying to draw it. Upload the video and Ill tell you within a few mins of you posting. GL man!

Jbaker901atu · 02-12-2015, 10:07 AM

Can you read or not.. I said my phone won't pick it up.

Gee · 02-12-2015, 10:13 AM

Quote:

Originally Posted by Jbaker901atu

Can you read or not.. I said my phone won't pick it up.

Ok bro.... Good luck.

MrChrisLS3 · 02-12-2015, 10:42 AM

Typically, if it is specific rod the knock will sound heavy and solid and will match the rev's of the engine. If it is a lifter it will be similar but not as heavy and twice the speed of the rpm. The thing to note is that it will stand out noticeably over the rest of the engine noise. Sometimes a bad lifter will reveal itself at a little higher rpm than idle.

Also check or have check the PCV system, and possibly a top end clean. The issue with DI engines is carbon build up on the back of the valves as there is no fuel sprayed on them to keep them clean.

02-11-2015, 10:05 PM	#1
Jbaker901atu Drives: 2011 Camaro LS Join Date: Jan 2015 Location: Arkansas Posts: 42	Rod? Lifter? Exhaust? Recently purchased a 2011 v6 camaro standard from a dealer. Has 45k miles. Noticed a very subtle but rapid low pitched knocking. Soundo like it's coming from the glove box area of passenger side and almost impossible to hear outside of the car, you really need to be in cabin. I don't hear it when I accelerate and It doesn't matter in the ac/heater is on or not. Did the old screwdriver to block trick and didn't hear any enhancement. Still owe 10k. On it so I'm freakin out a little. Still under powertrain warranty for a year. Thank you.

02-11-2015, 10:06 PM	#2
Jbaker901atu Drives: 2011 Camaro LS Join Date: Jan 2015 Location: Arkansas Posts: 42	Also, it's on and off. Don't hear it all the time and can only hear it when it's quiet, like at night. Took it to local dealer, he said he doubts it's a lifter or rod. Thinks it is either exhaust or catalytic issue

02-11-2015, 10:32 PM	#3
SmokinCarrot Drives: 2010 SS/RS Join Date: Nov 2014 Location: Washington Posts: 53	Don't know but I'll "bump" the question. Good luck.

02-11-2015, 11:04 PM	#4
Stealthpanda Thread Ender Drives: 2010 Camaro 2SS/RS L99 Join Date: May 2011 Location: South Jersey Posts: 1,038	There is a subtle, but noticeable, tick from the direct injection for 2010 and 2011 model LLTs. I think when the LFX came out they had found a "way" to reduce the ticking sound. Need a video to know if its a tick, knock, or squirrel living inside your valve cover.

02-11-2015, 11:15 PM	#5
Jbaker901atu Drives: 2011 Camaro LS Join Date: Jan 2015 Location: Arkansas Posts: 42	It's not the injector tick, that worried me at first.. it's so subtle not sure if my phone could pick it up.. more of a woodpecker sound.. much deeper than the injector tick

02-11-2015, 11:16 PM	#6
Jbaker901atu Drives: 2011 Camaro LS Join Date: Jan 2015 Location: Arkansas Posts: 42	I noticed it more when my car is decelerating, but the speed of the knock doesn't seem to change

02-11-2015, 11:18 PM	#7
omgitsmiketuck Drives: 2011 LS V6 (M) & 2019 LS I4 (AT) Join Date: Jan 2015 Location: Newbury Park, CA Posts: 346	my car has a ticking sound as well, but I've established its related to my AC. one of the bearings on one of my cabin fans is starting to go, and it ticks when at low speed. prolly not the same issue, but food for thought. seems like they used cheap fans in our AC.

02-11-2015, 11:21 PM	#8
Stealthpanda Thread Ender Drives: 2010 Camaro 2SS/RS L99 Join Date: May 2011 Location: South Jersey Posts: 1,038	I do think the screwdriver trick would apply to something loose/moving under the valve cover. If this isn't engine related, it could be something with a pulley/belt/accessory related. The fans, as mentioned above.

02-11-2015, 11:32 PM	#9
Jbaker901atu Drives: 2011 Camaro LS Join Date: Jan 2015 Location: Arkansas Posts: 42	Ok i appreciate the feedback... also, realistically, how likely is it for a ride with 45k on it to have a bad lifter/rod? This car showed no signs of abuse either. No pedal wear, no curb scrapes... nice tight clutch. Got it for a steal too. 16,500

02-12-2015, 12:30 AM	#10
Jbaker901atu Drives: 2011 Camaro LS Join Date: Jan 2015 Location: Arkansas Posts: 42	Bump

02-12-2015, 07:30 AM	#11
Gee Silver Ice Drives: 2011 1LT Coupe SIM Join Date: Nov 2013 Location: MA Posts: 1,418 View My Garage	Not trying to flame at all but, Video! How can we help you with a sound that we cannot hear? Thats like listening to a lady describing art via the radio then trying to draw it. Upload the video and Ill tell you within a few mins of you posting. GL man!

02-12-2015, 10:07 AM	#12
Jbaker901atu Drives: 2011 Camaro LS Join Date: Jan 2015 Location: Arkansas Posts: 42	Can you read or not.. I said my phone won't pick it up.

02-12-2015, 10:42 AM	#14
MrChrisLS3 Drives: 2018 1SS M6 Join Date: Nov 2014 Location: Houston Posts: 2,617	Typically, if it is specific rod the knock will sound heavy and solid and will match the rev's of the engine. If it is a lifter it will be similar but not as heavy and twice the speed of the rpm. The thing to note is that it will stand out noticeably over the rest of the engine noise. Sometimes a bad lifter will reveal itself at a little higher rpm than idle. Also check or have check the PCV system, and possibly a top end clean. The issue with DI engines is carbon build up on the back of the valves as there is no fuel sprayed on them to keep them clean.