Engine knock 1999 maxima

According to page 10-3 of the 2001 Nissan Maxima Owner's Manual:

FUEL RECOMMENDATION
Unleaded premium gasoline with an octane
rating of at least 91 AKI (Anti-Knock Index)
number (Research octane number 96)
If unleaded premium gasoline is not available,
unleaded regular gasoline with an
octane rating of at least 87 AKI (Research
octane number 91) can be used.
However, for maximum vehicle performance,
the use of unleaded premium gasoline
is recommended.

Engine "knock" is not just an unusual sound - but over time can cause real damage to the engine. You *should* use fuels with the recommended octane levels, but if you choose to use fuel with a lower octane level due to reduce fuel costs - do not repeatedly use fuel that causes engine knock. Find the "sweet spot" between the cost of lower octane fuel and an octane level that does not cause knocking. Expect fuel economy and performance to drop with lower octane fuels, too.

Good luck!

P0325 is a knock sensor. the knock sensor will not set the ses ligth

The knock sensor is located below the intake manifold

Im having the same issue w/ my 99 maxima. had the problem 2 months ago, they replaced coil, changed plugs, told me that I would still get knock sensor code but dont worry about it. Now the rough idling and check light flashing is happening again.

sounds like engine ping use better gas see if that helps. If not check you engine bay when accelerating.

Try using a different brand of gas.

Your knock sensor is located Under the hood, center, front engine area, below intake manifold, mounted on block.


A defective knock sensor may cause engine detonation or reduced spark advance and fuel economy. When a knock sensor is removed and replaced, the sensor must be tightened to its specified torque. If the knock sensor is installed tighter than it should be, it may become too sensitive and provide an excessively high voltage signal, resulting in more spark ****** than required. When the knock sensor is installed looser than it should be, the knock sensor signal will be lower than normal, resulting in engine detonation.

To replace the knock sensor:

• Disconnect the knock sensor wiring connector.
• Then, unscrew the sensor.
• Remove the knock sensor.
• Reverse the procedures to install the part.

what you are hearing is a spark knock or detonation. its not going to hurt anything or cause any damage. if you want to get rid of it than run out all the fuel that you have and fill up with super and see if it changes with premium gasoline. if you look at the fuel door on the inside, it sais premium fuel recommended. also stay with NGK (nissan)spark plugs. You may also need the r/h side rocker cover. the one by the fire wall. the seals inside the cover leak oil into the spark plug hole and you will need to replace it if you find oil in the hole. let me know what you find.

1995 Nissan Maxima, where is the knock sensor and how hard is it to replace?