1997 Nissan Altima SE 2.4l 4-Cyl Automatic. P0325 (Knock Sensor). A short time ago, I went to advance Auto and had them scan my car (OBD II) and got a P1400 and a P0325. The EGRC Solenoid has been replaced, which leaves me with the P0325. A lot of mechanics (including you in one video) said that there are plenty of things that can cause a car to say the knock sensor is bad when it in fact is not. Here is what my car is doing. Please note before I say all this that almost every bit of this is intermittent. Sometimes it will, sometimes it wont. Sometimes it's mile, sometimes is really bad, etc...

When I crank the engine, it'll idle high (1000-1250 rpms) for about 5-10 seconds, and then over the course of about 20-40 seconds it'll slowly idle down to about 750-850 rpms. Then it'll usually stay between 800-1000 (while idling) once the car has been running. Intermittently, the engine will begin stumbling (rpm's drop to 100-250 rpms then back up) and it will all too often stall out. I've watched the car as it's doing this. The engine temp is irrelevant, the atmospheric temperature is irrelevant, the speed the car is moving is mostly irrelevant, but if the car is moving and the gas pedal is being pressed, it'll stumble some but normally does not do so enough to threaten to stall (but it does try). It's kind of like the older record players. Remember you used to unplug them and the record would still turn while producing sound but it'd get slower and slower (capacitors discharging). Then you plug it back up and it slowly returns to normal operation. My engine does something like that, just a lot faster.It takes literally (though guessing) about 250-350 milliseconds for it to idle down then back up. The only thing I have noticed are strange puddle of water under the vehicle (but it rained the day before ((no a/c was running on the car at all)) and some areas of the engine bay towards the back of the engine bay (left rear section) (assuming your standing in front of the car looking towards the rear with the hood up) seems to be moist. Also, there is a spark plug (closest to the passenger side tire) that has not been changed in years since there is rubber debris from where a previous owner never changed the plug wires and it dry rotted inside the chamber. If you wanna see what my car looks like under the hood, hit YouTube and look for a video by "EricTheCarGuy" where he changes an intake manifold on a 97 Nissan altima 2.4L. That car, paint color included, is a perfect clone of mine, though mine is much much geasier. Also, I'm 98% certain that the o-ring on the distributor is damaged as there is a TRACE amount of oil inside (only on the tower portion) of the distributor.

I have taken some stuff off in order to try and fix it myself due to the fact that there IS NO MONEY to pay anyone anything period, and I am not 100% sure I can put it all back, so I can't start it right now.

Comments (4)
No. 1-3
MitchellTurner
MitchellTurner

Thank you for responding. I am so busy with wok that I have not had time to do anything. Once I get the time to do these things, I will reply again and let you know what I find out. :-) Thank you again, Mr. Kilmer.

MitchellTurner
MitchellTurner

I don't know how to do any of this. I guess it's time to watch more videos and try to see if I can figure it out. Thanks for responding.

Scotty Kilmer
Scotty Kilmer

Editor

so many things can do those running problems, but if you disconnect the knock sensor wire, then it can't be one of them. Start there. Being that old, start with a wet and dry compression test to see if engine is just flat wearing out