michael7278

So, today I got my new knock sensor for my 95 max.
Took me about 20 minutes to install it.
I noticed some improvements in pickup, we will see about the MPGs.
I was curious to see what I paid over $100 bucks for and what makes it tick, so i decided to get my dremel out and take a peek inside the old one.

The bad one tested with a meter, showed to be completely open ( new one 550K ).
There were two cracks along both sides of the connector, most likely caused from over heating.
So, i cut it open and found nothing really fancy inside. As you can tell from the pictures, it is mostly a hunk of metal sandwiching a ceramic like substance which produces a voltage spike when it "hears" a knock.
I suspect that the cracks let in moisture which ruined the contact between the rings and the ceramic like substance.
I had read here some people believe over tightening the knock sensor makes it over sensative. I dont know how true that is since the bolt that goes through it puts no pressure on the critical part. Overtightening is not a good idea anyways since you are screwing into aluminium.

Well here are the pics: ( to our friend at Motorvate.ca if you want these to use on your site, PM me)

Miasma

hope that helps.

and the KS actually does not produce a 'voltage spike' rather, its own resistance increases. and as a solid state device, there is nothing interesting inside.

MaxWolf

iTrader: (1)

can't get photo's to come up

michael7278

Here are the URLs if you still dont see them in the body:
http://a0.cpimg.com/image/E4/41/1674...-02000180-.jpg
http://a1.cpimg.com/image/E5/41/1674...-02000180-.jpg
http://a2.cpimg.com/image/E6/41/1674...-02000180-.jpg

Michael

Miasma

i just looked at my KS, and i have the same cracks

Little95Max

Where did you buy the KS from? I'm pulling the 0304 code, so I might need one also. The dealer near me is wanting $180! I know that's too much.

Thanks.

dynas

I can not see the pictures either.

My Maxi got 0707 and 0304 code for months now. They keep coming back every 200-300 miles. Maybe need to replace? Folks, if you have found good price on KS, please post. Thanks.

xHypex

iTrader: (1)

I'm not seeing the pictures either, but if you email them to me (hype@vanillaice.com) I'd be happy to host them. I know the KS is pretty simple, but I'd be interested in seeing the internals.
-hype

Lime

0707 = Rear Heated O2 sensor
The knock sensor reading is probably going off because of the 0707...replace the O2 sensor, reset the ECU, and see if 0304 comes back.

pjalst

I sure hope your cat doesn't die

michael7278

xHypex;
I used one of the suggested sites (Clubphoto.com) to host the pictures, they were good till today, but now
I will email them to you...

The best deal I found was at expressautoparts.com $107, free shipping.
They are located in NY, part came from NJ.
It is Bosch F6020-51596.

I also had the rear O2 sensor code (0707?), which comes and goes all the time, I will try cleaning it. after resetting the CEL, the KS code was always there, and when I saw the cracks on it, I knew it had to go, regardless of the O2 code.

Miasma

i see the pix fine, you are all newbs!!!

michael7278

Miasma,
he is not talking about the little thumbnails, he is talking about the ones I put in the body of post. Do you see those?
I used to see them myself, but now all i see is the 25C ad!

KsuMax

No picture.

Miasma

yup, i see em all

michael7278

You must still have them cached on your PC from yesterday!

na95gle

iTrader: (3)

You can give Ken a call at JRNissan. He sells them for 120 + shipping i believe.

Miasma

just refreshed them. still workin great!

xHypex

iTrader: (1)

Here's the pictures
http://imageevent.com/xhypex/knocksensor?n=0

Very high quality pics.
-hype

PhatBastard

iTrader: (3)

"The Parts Bin" has Bosch knock sensors for $112.54 with free shipping.

www.thepartsbin.com