After market efi. Do I need knock sensors

T

Tony1968

Not-quite-so-new-guy
Jul 1, 2018
48
13
8
#1
As stated. Thanks
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
23,105
4,029
113
Kitchener, Ontario
#3
if you have a factory computer controlled distributor then your engine would already have a knock sensor. If you don't have a computer controlled ignition system then a knock sensor has no place to send it's info.
 
T

Tony1968

Not-quite-so-new-guy
Jul 1, 2018
48
13
8
#4
Not using stock ecm. Going with Holley or Fast most likely. This is a 6 liter lq4. Can't find information about whether those efi systems use knock sensors
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
23,105
4,029
113
Kitchener, Ontario
#5
Not using stock ecm. Going with Holley or Fast most likely. This is a 6 liter lq4. Can't find information about whether those efi systems use knock sensors
Like I said a knock sensor involves the computer and timing, it has nothing to do with the fuel injection system so that is why the systems you are looking at don't have any information about a knock sensor. The other thing is if you do not have any knock sensors installed in the block now how are you going to install them?
 
Last edited:
Streetbu

Streetbu

G-Body Guru
May 22, 2011
599
640
93
Central NY
#6
Stock LQ4's use knock sensors. Aftermarket efi systems do not AFAIK....
 
Northernregal

Northernregal

Master Mechanic
Oct 24, 2017
300
522
93
Red Deer AB
#8
The Holley system hooks into a knock sensor but you don’t have to have it do much in your tune. A general consensus is that you stop making power gains before knock happens. If you add timing and you don’t see a difference then you are getting close to the edge so drop a degree or two.
 
T

Tony1968

Not-quite-so-new-guy
Jul 1, 2018
48
13
8
#9
so is it your opinion that i can do away with the sensors and replace valley cover with something prettier ?
 
Northernregal

Northernregal

Master Mechanic
Oct 24, 2017
300
522
93
Red Deer AB
#10
Yup. You could get a Gen IV knock sensor and bolt it to the side of the block if you want to have one there. That’s another option.
 
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