vidro Posted January 8, 2006 Share Posted January 8, 2006 I was looking for a "shoulder seat belt assembly" when I ran a crossed a "Knock sensor" for a 95 Pathfinder. Can someone elaborate as to what a "Knock sensor" would be used for? I can only assume by it's name that some how it sense engine knocks. I would think that any individual with semi-descent hearing could notice a rod knocking. Link to comment Share on other sites More sharing options...
Slick Posted January 8, 2006 Share Posted January 8, 2006 (edited) you are correct. it is a sensor for the motor. Here it is on my '92. BIOTCH to get to unless the motor is out. FYI: that pic was taken with the motor out. the sensor is at the back of the motor Edited January 8, 2006 by Slick Link to comment Share on other sites More sharing options...
sw Posted January 8, 2006 Share Posted January 8, 2006 (edited) well my understanding is a knock sensor isnt for 'when the rods or crank are slapp'n around'!!!! its for 'knocks' caused by lean air/fuel mixture during heavy load . ie the mixture in the combustion chamber exploding before the spark from the spark plug & before the piston has reached the top of its compession stroke. 'knocks' are very bad for your motor, they will destroy it quick smart. 'knocks' are audible as high pitched, low volume 'pings'. Edited January 8, 2006 by sw Link to comment Share on other sites More sharing options...
Precise1 Posted January 9, 2006 Share Posted January 9, 2006 Bingo, sw gets the prize !! B Link to comment Share on other sites More sharing options...
93blkpathr Posted January 9, 2006 Share Posted January 9, 2006 Thanks for the pic, Slick...............I've been wondering exactly where that thing sits Link to comment Share on other sites More sharing options...
vidro Posted January 9, 2006 Author Share Posted January 9, 2006 Would the "knock" than be the same as the term "pre ignition" ? The knock isn't the rocker arm slap when the lifters float is it? What happens when it does sense a "knock" ? Link to comment Share on other sites More sharing options...
sw Posted January 9, 2006 Share Posted January 9, 2006 spot on - knock is pre ignition. when the sensor senses' something the computer 'retards' ignition timing, you lose power but it stops the motor from pre igniting. well thats what is supposed to do anyway. Link to comment Share on other sites More sharing options...
vidro Posted January 10, 2006 Author Share Posted January 10, 2006 WAIT!!! Recently, with in the past 3 months, someone posted something about a mechanic in Arizona and a "white page" (my term). It had something to do with a smacking sound in Nissans, similar to the Valves hitting the pistons. The commentary explained that it was a solenoid that could be changed to stop this sound. I did a search and did not come up with the post. I the individual that posted it is probably in an alcohol induced coma state by now. For it was mention he was going to grab a brew and ponder the issues while staring at that engine in hopes of finding the solenoid. I never found a solenoid on my 95 but knowing the tenacity of most of those that post on this site I figured the original author of that post is going to ponder till they find one. Back to my thought would this “knock sensor” possibly also somehow be able to manipulate the engine to create that “smaking” sound at an idle? Link to comment Share on other sites More sharing options...
94 Pathy Posted January 11, 2006 Share Posted January 11, 2006 SW, How in the world did you get that angle to shoot a pic of the knock sensor? On my '94 it's in the same location, but back further on the block. PITA to replace, but now I can do it blind folded. Not too bad after having it pulled apart and back together again twice. Good luck Vidro! If you need any help and have questions, don't hesitate to email for help. I can email you a write up on the topic if need be. For some reason it never got onto the site for others to use, so I've kept it around for referances. Later ALL! Link to comment Share on other sites More sharing options...
Slick Posted January 11, 2006 Share Posted January 11, 2006 (edited) SW, How in the world did you get that angle to shoot a pic of the knock sensor? On my '94 it's in the same location, but back further on the block. PITA to replace, but now I can do it blind folded. Not too bad after having it pulled apart and back together again twice. -study- *clears throat* ummm.. actually.. that's MY motor.. and the pic is from when i pulled my motor out ... so i had more than enuff room to take a pretty picture.. i also took the pic from the back looking forward Edited January 11, 2006 by Slick Link to comment Share on other sites More sharing options...
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