Knock sensor
Posted: Fri Dec 02, 2022 5:22 am
I got an interesting situation. Different from what I've researched here and other forums.
Knock sensor code pops up on every cold start. Will go away once car warms up. Will stay off if I'm under 40 MPH ish. Will stay off if I'm flooring it or driving in the city.
It turns on if I'm doing 50 mph ish at a constant speed, if I'm on the freeway, and going downhill above 50 mph. It won't go away until I drive for about 3 minutes in the city or I shut the car off then turn it back on.
This issue started only after I changed my spark plugs. It had the ngk (can't remember number) plugs that come gapped at .039 (the fine tip). I pulled them out and all of them were gapped out of spec (between .035 and .042). I replaced them thinking it needed new ones. I threw in the oe ngk that come gapped at .044 (v cut tip) and then the issue started. I cleared the code by connecting the 2 wires under the dash, but it came back. Then I tried a tighter gap at .035 and got the same code. Pulled nice when the code didn't come on. Tried a new set of ngk again at .039 and it's still doing it. I checked to make sure the rings on the plugs were seated properly, checked to make sure plug wires were not loose or broken, cleaned maf, changed knock sensor with I believe was Hitachi brand or the Japanese one (old one looked fine as well, no cracks).
The engine doesn't sound like it's knocking. Sounds really healthy. When the code comes on and I try to run it hard it just spools the turbo but I don't feel the boost kick in.
Someone said to try another sensor and maybe a new ecm/ecu.
Has anyone had this problem? Anything else I should try or replace?
Just signed up to this forum. If this has been solved or I need to move it don't hesitate to call me out.
Knock sensor code pops up on every cold start. Will go away once car warms up. Will stay off if I'm under 40 MPH ish. Will stay off if I'm flooring it or driving in the city.
It turns on if I'm doing 50 mph ish at a constant speed, if I'm on the freeway, and going downhill above 50 mph. It won't go away until I drive for about 3 minutes in the city or I shut the car off then turn it back on.
This issue started only after I changed my spark plugs. It had the ngk (can't remember number) plugs that come gapped at .039 (the fine tip). I pulled them out and all of them were gapped out of spec (between .035 and .042). I replaced them thinking it needed new ones. I threw in the oe ngk that come gapped at .044 (v cut tip) and then the issue started. I cleared the code by connecting the 2 wires under the dash, but it came back. Then I tried a tighter gap at .035 and got the same code. Pulled nice when the code didn't come on. Tried a new set of ngk again at .039 and it's still doing it. I checked to make sure the rings on the plugs were seated properly, checked to make sure plug wires were not loose or broken, cleaned maf, changed knock sensor with I believe was Hitachi brand or the Japanese one (old one looked fine as well, no cracks).
The engine doesn't sound like it's knocking. Sounds really healthy. When the code comes on and I try to run it hard it just spools the turbo but I don't feel the boost kick in.
Someone said to try another sensor and maybe a new ecm/ecu.
Has anyone had this problem? Anything else I should try or replace?
Just signed up to this forum. If this has been solved or I need to move it don't hesitate to call me out.