Spark Knock noise?

TedB370z · 02-07-2014, 07:16 AM

Mechanic said the rattle is coming from the passenger side cat - and other than one time they could not replicate the spark knock. The odd thing is it will only spark knock/diesel when in gear it can idle perfect and goes through the RPM range fine when in park or neutral. If it's in gear say at a stop light... if you press the gas slowly it'll hesitate and you'll hear the dieseling noise. It will also drop RPMs to 500 randomly when stopped in gear.... thoughts? If it was an issue with the cat I'd assume it would have the issue regardless of being in gear or not?

SouthArk370Z · 02-07-2014, 07:45 AM

Putting the car in gear can cause the exhaust system to move and result in a rattle.

Chuck33079 · 02-07-2014, 07:46 AM

The P0300 can also be triggered by a loud enough rattle. The knock sensor is very sensitive. If the rattle is loud enough for the knock sensor to pick it up, you'll get the code.

TedB370z · 02-07-2014, 09:15 AM

I put it up and yeah... it sounds like the entire inside of the passenger side cat is disconnected from the casing....

Chuck33079 · 02-07-2014, 09:19 AM

Look on the bright side- now you're within the letter of the law to swap them out for a set of HFCs.

I'll bet you can get a set of good HFCs for what one OEM cat costs.

TedB370z · 02-07-2014, 09:27 AM

HAH yep stock is $375 for just one side... Kinetix are $399 for the set..

Chuck33079 · 02-07-2014, 09:30 AM

Then you know what you have to do

TedB370z · 02-13-2014, 12:06 AM

Ordered the parts, but in the mean time did a data log.... wondering if anyone wants to take a look and see if they notice anything weird? Specifically between 23:07 and 23:17... It was stop sign, 1/4 to a red light, then the spark knock happened.....I'm not really sure what all I'm looking at, just curious what all the sensors think is happening.

Excel spreadsheet, delimited by comma datalog.zip

1slow370 · 02-13-2014, 02:28 AM

all you have to do to be int the "letter of the law" for cat replacement is pull the upper o2's out grab a funnel, pour in some 30 weight, take it to a shop and say they are fouled, instant blown cats lol

TedB370z · 02-24-2014, 09:42 AM

Nissan replaced the passenger side cat under warranty for free, I did see what it would have cost if I had to pay... $976.

Later that night... I pulled the plugs...

(***to replace them... which I did but 3 miles later I had to pull them all off, to make a long story short 3 of them broke... that's another story though.. anyway***)

.. I checked the gap on the stock plugs which all were fine, put them back on, and installed newer coil packs off a wrecked 2011 with 9000 miles. This solved my idling and spark knock issue.

But now, at low RPM, only when in gear, I get valve chatter, the spark knock was masking it, as its a similar sound but now the spark knock/dieseling gone, you can more clearly hear it I've read this could be anything from crappy oil or need to run synthetic (I've only ever run 5w30 conventional oil by Castrol, Valvoline or Quaker State, even in my 350z)

I've heard of a lot of G37's having this issue, if I can I'll make a recording of it.

SouthArk370Z · 02-24-2014, 09:51 AM

Quote:

Originally Posted by TedB370z

...But now, at low RPM, only when in gear, I get valve chatter, the spark knock was masking it, as its a similar sound but now the spark knock/dieseling gone, you can more clearly hear it I've read this could be anything from crappy oil or need to run synthetic (I've only ever run 5w30 conventional oil by Castrol, Valvoline or Quaker State, even in my 350z) ...

Try using ester oil.

Chuck33079 · 02-24-2014, 10:00 AM

Quote:

Originally Posted by TedB370z

Nissan replaced the passenger side cat under warranty for free, I did see what it would have cost if I had to pay... $976.

Later that night... I pulled the plugs...

(***to replace them... which I did but 3 miles later I had to pull them all off, to make a long story short 3 of them broke... that's another story though.. anyway***)

.. I checked the gap on the stock plugs which all were fine, put them back on, and installed newer coil packs off a wrecked 2011 with 9000 miles. This solved my idling and spark knock issue.

But now, at low RPM, only when in gear, I get valve chatter, the spark knock was masking it, as its a similar sound but now the spark knock/dieseling gone, you can more clearly hear it I've read this could be anything from crappy oil or need to run synthetic (I've only ever run 5w30 conventional oil by Castrol, Valvoline or Quaker State, even in my 350z)

I've heard of a lot of G37's having this issue, if I can I'll make a recording of it.

So what you're calling spark knock was the dead cat rattling around setting off the knock sensor?

TedB370z · 02-25-2014, 03:23 PM

After they replaced the cat, obviously the rattle was gone, then I switched coil packs, which got rid of the spark knock, but now I hear... Valve noise? I recorded this by just setting my phone on the windshield, its only at low rpm, while in gear, you can feel hesitation, but when you give it gas, it goes away, and its not constant either:

http://youtu.be/Uf9PjW9PJcc

1slow370 · 02-25-2014, 03:25 PM

ah yes the second law of auto repair "If thou fixith one noise, thou shalt hear another"

TedB370z · 02-25-2014, 04:04 PM

It just sounds.. Sooo... Awful...

02-07-2014, 07:45 AM	#2 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324199	Putting the car in gear can cause the exhaust system to move and result in a rattle. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

02-07-2014, 07:46 AM	#3 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29540	The P0300 can also be triggered by a loud enough rattle. The knock sensor is very sensitive. If the rattle is loud enough for the knock sensor to pick it up, you'll get the code. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

02-07-2014, 09:19 AM	#5 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29540	Look on the bright side- now you're within the letter of the law to swap them out for a set of HFCs. I'll bet you can get a set of good HFCs for what one OEM cat costs. gbrettin likes this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

02-07-2014, 09:30 AM	#7 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29540	Then you know what you have to do __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

02-13-2014, 02:28 AM	#9 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,733 Drives: v8 74 260z ;) Rep Power: 7252	all you have to do to be int the "letter of the law" for cat replacement is pull the upper o2's out grab a funnel, pour in some 30 weight, take it to a shop and say they are fouled, instant blown cats lol __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

02-07-2014, 07:16 AM	#1 (permalink)
TedB370z Base Member Join Date: Aug 2013 Location: Pittsburgh, PA Posts: 87 Drives: 09 Nissan 370z Rep Power: 13	Mechanic said the rattle is coming from the passenger side cat - and other than one time they could not replicate the spark knock. The odd thing is it will only spark knock/diesel when in gear it can idle perfect and goes through the RPM range fine when in park or neutral. If it's in gear say at a stop light... if you press the gas slowly it'll hesitate and you'll hear the dieseling noise. It will also drop RPMs to 500 randomly when stopped in gear.... thoughts? If it was an issue with the cat I'd assume it would have the issue regardless of being in gear or not?

02-07-2014, 09:15 AM	#4 (permalink)
TedB370z Base Member Join Date: Aug 2013 Location: Pittsburgh, PA Posts: 87 Drives: 09 Nissan 370z Rep Power: 13	I put it up and yeah... it sounds like the entire inside of the passenger side cat is disconnected from the casing....

02-07-2014, 09:27 AM	#6 (permalink)
TedB370z Base Member Join Date: Aug 2013 Location: Pittsburgh, PA Posts: 87 Drives: 09 Nissan 370z Rep Power: 13	HAH yep stock is $375 for just one side... Kinetix are $399 for the set..

02-13-2014, 12:06 AM	#8 (permalink)
TedB370z Base Member Join Date: Aug 2013 Location: Pittsburgh, PA Posts: 87 Drives: 09 Nissan 370z Rep Power: 13	Ordered the parts, but in the mean time did a data log.... wondering if anyone wants to take a look and see if they notice anything weird? Specifically between 23:07 and 23:17... It was stop sign, 1/4 to a red light, then the spark knock happened.....I'm not really sure what all I'm looking at, just curious what all the sensors think is happening. Excel spreadsheet, delimited by comma datalog.zip

02-24-2014, 09:42 AM	#10 (permalink)
TedB370z Base Member Join Date: Aug 2013 Location: Pittsburgh, PA Posts: 87 Drives: 09 Nissan 370z Rep Power: 13	Nissan replaced the passenger side cat under warranty for free, I did see what it would have cost if I had to pay... $976. Later that night... I pulled the plugs... (*to replace them... which I did but 3 miles later I had to pull them all off, to make a long story short 3 of them broke... that's another story though.. anyway*) .. I checked the gap on the stock plugs which all were fine, put them back on, and installed newer coil packs off a wrecked 2011 with 9000 miles. This solved my idling and spark knock issue. But now, at low RPM, only when in gear, I get valve chatter, the spark knock was masking it, as its a similar sound but now the spark knock/dieseling gone, you can more clearly hear it I've read this could be anything from crappy oil or need to run synthetic (I've only ever run 5w30 conventional oil by Castrol, Valvoline or Quaker State, even in my 350z) I've heard of a lot of G37's having this issue, if I can I'll make a recording of it.

02-25-2014, 03:23 PM	#13 (permalink)
TedB370z Base Member Join Date: Aug 2013 Location: Pittsburgh, PA Posts: 87 Drives: 09 Nissan 370z Rep Power: 13	After they replaced the cat, obviously the rattle was gone, then I switched coil packs, which got rid of the spark knock, but now I hear... Valve noise? I recorded this by just setting my phone on the windshield, its only at low rpm, while in gear, you can feel hesitation, but when you give it gas, it goes away, and its not constant either: http://youtu.be/Uf9PjW9PJcc

02-25-2014, 03:25 PM	#14 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,733 Drives: v8 74 260z ;) Rep Power: 7252	ah yes the second law of auto repair "If thou fixith one noise, thou shalt hear another" __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

02-25-2014, 04:04 PM	#15 (permalink)
TedB370z Base Member Join Date: Aug 2013 Location: Pittsburgh, PA Posts: 87 Drives: 09 Nissan 370z Rep Power: 13	It just sounds.. Sooo... Awful...

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Go Canelo! Knock Mayweather out!!	gussyturbo z	Sports	3	09-15-2013 06:45 AM
[FOR SALE] CA: 09+ 370z OEM Knock Sensor	J2FRESH	Parts for sale (Private Classifieds)	0	05-08-2012 01:05 PM
Light engine pinging/knock	bigrob126	Engine & Drivetrain	4	08-20-2011 07:49 AM
knock on startup	Daishi	Engine & Drivetrain	16	12-19-2010 09:41 PM
Knock from the clutch pedal	Oscar135	Engine & Drivetrain	34	07-27-2010 12:10 PM