CEL: Knock sensor

sleepydsm · 10-13-2006

I just replaced my crap blow out knock sensor, and since then, minutes after startup I get a CEL for Knock sensor/or circuit malfunction (I used a mastettech scanner and it said it was code DTC 31). I just put in a brand new Mitsubishi OEM sensor, torqued just right. So wtf is up? Circuit issue?
-Kevin

**scheides** · 10-13-2006

how much did you tighten it? The knock sensor is a pretty sensitive unit. Clear the code and see if it comes back.

blageo23 · 10-13-2006

I feel like if it was torqued too much it wouldnt throw a code. Check the wires and the pin fitment.

gofastman · 10-13-2006

A crap blow out knock sensor, eh?

didnt you say your ECU caps. were fuct? im guessing thats the problem
is this the same code it was throwing when we were working on your tranny?

sleepydsm · 10-13-2006

My ECU caps are leaking, yes. This code wasn't on before I modded it (for those who don't know, the car was stock until the day after the cookout, and wasn't driven until 6 weeks later, with a few mods on 'er). The knock sensor on the car had the back all melted/blown out, so I replaced it with a new OEM one. As discussed in many threads, I acheived the 10-12 ft-lbs for the knock sensor with my Snap-On "use a damn crescent wrench and tighten it a half turn" tool.

carltalon · 10-14-2006

Are you shure you got the right sensor 1g/2g I think the look the same but can't be swapped

blageo23 · 10-14-2006

The 1G one is bigger then the 2G one. The 1G one is about 1" and the 2G one is like 1/4"(ther hex part you tighten). Also Im almost positive they have different connecters too.

sleepydsm · 10-17-2006

You can all call me retarded from now on...

Today I finally physically looked. I never connected the brand new knock sensor. It still had the protective cap over the plug. Fixed the problem now its connected lol. Wow, I must have been in a hurry to get the car going.

blageo23 · 10-17-2006

You freakin NARNAR!

Shane55113 · 10-17-2006

A//// Guy · 10-17-2006

You get a sticker!

**scheides** · 10-17-2006

That sounds like something I would have done. I can't believe you didn't check that right away! Always double check all your connections!