1988 K5 silverado... 2 knock sensors or two Coolant temp sensors?

[dirtwarrior17]

I got an extra sensor left over from my 88 block to '79 block swap and i don't know what the hell it is. The motor runs fine without it and it either senses vibration or temperature. I don't have pics........

Any ideas?

I know some models had 2 cts or two knock sensors just not which models.

Where does it go?

 

[90blzr]

You got the one in the front of the intake? (coolant temp), its kinda hidden.

 

[dirtwarrior17]

Yup... the front cts is hooked up and in the front of the manifold next to the thermostat... the leftover sensor doesn't seem to fit anywhere...

 

[tx_sub]

assuming your 88 block was fuel injected, it had two cts's. the one in the intake is for the computer iirc and the one in the driver side head is for the guage.

 

[sled_dog]

The knock sensor should be on the passenger side above the oil pan. Coolant temp is in the front crossover and there is another sensor that goes into the head on the driver side. It goes into a waterjacket but I have no idea what it does. I run a 70s motor with TBI in my Suburban, I had to get adapters to put that sensor into my older style heads. Maybe thats the one you are having trouble with.

 

[dirtwarrior17]

yup... sounds like that the one... Can i use it on Camel humps?

 

[dirtwarrior17]

I haven't checked it this will fit yet but can i run it off the water pump or is that too far away from the heat?

 

[dyeager535]

Single prong round connector=knock sensor
Single prong (typically a nail head on the senor) is coolant sensor for gauge.
Dual prong is CTS.

Coolant sensor for the gauge really doesn't matter where it is, since it's relative, but it would look odd to have the gauge reading 150* all the time. Every head I've seen has been drilled/tapped for that sensor, although there are two different threads used, as mentioned, its easy to adapt.

 

[dirtwarrior17]

Can i run it out of the water pump plug? The camels don't look like they have a spot for a sensor.