When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Can someone direct me to an description on how to replace the knock sensor on a 2004 Infiniti I35? Understand it's the same as a 2003 Nissan Maxima. Thanks!
I have not personally done this on a vq35, only a vq30, so I can not verify the information here. However, it says you don't have to remove the manifold though, just the air ducting.
I've replaced them on the vq35. I took the intake manifold off to access the valley between the cylinders to get to the knock sensor (like the first picture above). I remember seeing info on the site about accessing the knock sensors without removing half the engine, but it was a major PIA! Its not terribly difficult, just time consuming. While you are at this level of removal, you might as well replace the spark plugs.
I just did this on my '02 GLE. Took only 30 minutes, and I have big hands! There is no need to remove anything but the black plastic air filter housing and hose leading to the throttle plate. Once removed, you have clear access with a socket and extensions to the knock sensor chamber in the middle of the engine. The socket and extensions will work for bolt removal, but be prepared to have to hand thread the bolt when reinstalling. I have permanent scratches on my hands, but got it done. Most people's hands will actually fit into the chamber to reach and turn the bolt. Please be sure to get the correct knock sensor harness, or be prepared to modify the sensor and a 4th gen harness!
I just did this on my '02 GLE. Took only 30 minutes, and I have big hands! There is no need to remove anything but the black plastic air filter housing and hose leading to the throttle plate. Once removed, you have clear access with a socket and extensions to the knock sensor chamber in the middle of the engine. The socket and extensions will work for bolt removal, but be prepared to have to hand thread the bolt when reinstalling. I have permanent scratches on my hands, but got it done. Most people's hands will actually fit into the chamber to reach and turn the bolt. Please be sure to get the correct knock sensor harness, or be prepared to modify the sensor and a 4th gen harness!
Excellent comment, very informative. Thank you. This is everything I needed to know.
I did this a few months on a 3.5 without removing the manifold. It can be done. When putting in the new sensor, I put the bolt on the sensor and a tiny piece of painters tape to help me guide it "home" by feel. Then pulled the tape while finger on the bolt.
I’d be very interested what modifying you did on your UIM…
when I had the original DE I mainly just got the NWP VIAS delete to eliminate all the stuff on top and tucked away the electric vacuum valve, and moved the green evap service port to the top of the transmission. my car also never had the bracket on the back of the intake manifold that bolts it to the head either. I also have all studs on the lower and upper intake manifolds. makes changing out the spark plugs way faster. also ditched the engine cover along with under hood insulation, it just traps heat..
Last edited by uptownsamcv; 04-08-2024 at 11:23 AM.
I see you also have modified your valve body. Or did you install a big bore? I used a block off plate for awhile, eventually went back to stock. I was losing too much low end acceleration.
I see you also have modified your valve body. Or did you install a big bore? I used a block off plate for awhile, eventually went back to stock. I was losing too much low end acceleration.
09-27-2016, 04:24 AM
