have a 84 Corvette that I have put in a 383 and the block is from a 95 silverado - it is a roller block. At initial startup I have a lot of knock counts during startup (I know there is not a timing problem) and I was wondering if the knock sensor from later SBC would be less sensative than my 84 knock sensor. Any thoughts?

 

I wouldn't worry about that, because it's not affecting performance in any way, it's just reporting some vibration and not doing anything about it.

Concentrate on other areas. But if you find that the sensor is really too sensative, there's other ways, such as a marine elbow, teflon, resistors, and also, as you say, I think there's some later model sensors that are less sensative.

 

It is not the knock sensor that is more sensitive, it is the ESC module from the Vette that is more sensitive. The early model knock sensors on the trucks ('88 to '92) had an impedance of 100K Ohms and an external ESC module then in '93 they switched to PCM's which use a 3.9K Ohm knock sensor with the ESC module in the Memcal. Basically, if you have an external ESC module you need the 100K Ohm sensor and if the ESC module is in the Memcal, use the 3.9K Ohm sensor. At least with the trucks anyway. HTH

 

Thanks for the replies. The ESC is from a 88 Vette so I guess there really is not much I can do about it.

 

You might try installing 90 degree 1/8" pipe thread adapter to the knock sensor. It will desensitise it. Or you could also try what is in the file I have attached. I have used both methods with some success. HTH

 

Thanks for the pdf file. Seems simple enough...