Jeep 401, 16197427, $OE, what do I do about a knock sensor? Getting code 43

[rang-a-stang]

Last night I picked up a Knock sensor (Duralast SU154 for a 1995 C3500, 7.4L), made a nifty bracket for it, threaded it in, grounded the bracket, soldered the connector onto the wire, and fired it up. Got a code 43 again.

I measure continuity between the KS connector center pin to PinB15 on my harness and got 0 Ohms. I measured continuity between the KS body and body ground and got 0 Ohms.

Did I get the wrong sensor? The sensor is position about as if it was threaded into my chassis, should I position it differently? Is there a test I can do on the KS (maybe I got one that was bad, right out of the box)? this circuit seems so basic, not sure why I am having trouble with it...

[dave w]

Measuring from the center of the knock sensor, were the wire plugs in, to the treads the resistance should be very close to 4000 (4K) ohms.

dave w

[rang-a-stang]

This knock sensor has 1000 ohms across it. Looking for another one (the correct one).

[rang-a-stang]

Went back to McParts and traded Knock sensors. I brought my Multi meter with me and measured it. Got one that is 4K ohms. I got home, plugged it in, and Voila! It worked, no more code 43!

[1project2many]

Good news. Yet another example of "New does not equal good."

[tayto]

i reckon if you bought an ac delco or delphi sensor there would have been no issue. why not install the knock sensor in the block? if it's too sensitive i've heard of some folks installing a brass 90* fitting then the knock sensor.

[rang-a-stang]

I think the difference in the 2 I had was one was for an Auto and one was for Manual. I don't know which sensor is which (meaning which sensor goes to stick and which goes to auto) which is why I brought my multi meter. wow, that sentence had a lot of which'es in it...

I hope to install the sensor in the block at some point. The original write up I read on how to add TBI to my rig said to just put 5v on the knock sensor pin so that's what I did. At this point I am just trying to get my truck to run correctly. Once I have it running a bit better I will experiment with adding it to my block.