the knock sensor is a little more involved than that.
it is a sensor that detects knock, however its not there to tell you that your engine is old. It works in conjunction with the other systems regulating fuel delivery and timing. The knock sensor was designed to allow different grades of fuel to be run and to adjust timing as your 02 sensors etc wear so that the engine doesn't knock. If you rebuilt your engine just because the knock sensor flagged then you probably wasted money you didn't have to. However, you did end up with a new engine which probably replaced whatever part was malfunctioning causing the knock sensor to flag. Also, as previously stated, the knock sensor DOES NOT CAUSE THE CEL TO TURN ON. It only shows if you plug the OBDII scanner in to scan it, and it usually shows in conjunction with another code. In my case, more than likely the issue is a worn o2 sensor, or the grounding TSB for the 96-98 pathfinder. I will replace these first and then re-evaluate if necessary.
I am quite sure that the issue is not the engine as I had a full diagnostic done on it when I bought including the compression which still tests like new.
i didn't f^king say i rebuilt the engine because there was a knock sensor code.
maybe you pretensious pricks need to read better.
no kidding, the knock sensor helps fine tune the engine... i f^king said that as well.
but if you've got an engine that has 230,000 f^king miles on it, if you change out a damn knock sensor, the engine is still going to have problems.
you can play with your sensors all freaking day long, if you've got a crappy engine, they'll just keep messing up. if you're trying to have a freaking perfect engine, then try buying a new one instead of fiddling with some
[email protected] pos. when you only halfass a job, (for you anal guys: only switch out the sensor that was on the ecu codes), then the other older components are going to take up the slack of that brand new sensor...
visa vi... you put in a brand new part, the other parts have more strain.
similar to when you guys switch out your VC gasket and not your PCV, and wonder why your oil pan and crankseals leak more afterwards.
YEAH, a knock sensor detects PINGS! IN THE ENGINE!, what originally causes the friggen pings?? hmmm.... old valvesprings?, old shims?, old cams and timing chains clicking on the inside transferring the sounds thoughout the engine?, maybe even old pistonrod bearings when some prick oilstarved the engine for a few minutes?
YEAH, a knock sensor helps fine tune the engine with the other components..
but fine tuning only does so much when you're dealing with leaking vacuum lines, or maybe bad diaphram valves, or maybe loose intake parts, or maybe old friggen sensors that someone dropped a wrench on 10 years ago, or maybe corroded wires and connections causing a higher Ohms in the system causing things to not work properly.
WHAT I MEANT BY REBUILDING A FRIGGEN ENGINE WAS THAT WHEN YOU START WITH A NEW ENGINE, THE FRIGGEN SENSORS THAT ARE STILL GOOD AND THE HARNESSES THAT ARE STILL GOOD (TAKING INTO ACCOUNT YOU WEREN'T A LAZY ASS AND TESTED ALL THE SENSORS/RELAYS/SOLENOIDS AROUND THE ENGINE WHILE THE ENGINE WAS OUT OF THE CAR AND APART) WILL GENERALLY WORK MORE EFFICIENT...
VERSUS JUST CHANGING OUT THE ONE SENSOR THAT'S ACTING UP, FOOLISHLY HOPING THAT THAT WILL SOLVE ALL THE PROBLEMS ON A F^KING ENGINE THAT'S 16-17 YEARS OLD.
before you act like an ass, try reading a little better. not skimming over a few sentences and then acting like you can figure out my lifepatterns by it.
freaking typical of know-it-all pricks that learned everything from a damn book or from daddy.