After going through a large puddle it now has a knocking noise coming from the rear of the engine, all cylinders have spark

no year stated, no engine options stated.so..??

its a engine block sensor a , microphone, that listens.

for engine (knock) ping or that killer detonation.

the ECU then retards spark to end the event. saving bacon.



my guess you got a DTC error and will not state that either?

you got it wet, let it dry out, it will get better.

using the scan tool after its dry, rest the DTCs and drive.

see if it , comes back, like all DTCs , this is done. after corrections.

Sounds like a bad rod bearing, no cure except a rebuild. I assume you do know the difference between spark knock and bearing knock.

The knock sensor code does not always mean the sensor is faulty.
The sensor picks up noise and vibration in the engine such as a spark knock would generate, and the computer slows down the spark timing to fix it. If the noise or vibration continues, the code is set.
Could be a noisy valve, or a problem with the crankshaft or other component.

faulty intake manifold maybe?

Sounds like you have a front or rear oil seal gone.......A loss of oil will cause knocking and your crank bearings to go which will really knock....Hope this helps.

Is it an engine knock if it is an engine knock and killing the cylinder by removing spark or fuel makes it go away then your injector is in fact working. The reason the noise quiets down its because you've eliminated that which would cause a load or pressure in that cylinder. This means you have some worn internal engine parts.

Not related to the O2 sensor. Located on the front of the engine just above the starter KNOCK SENSOR (KS) SYSTEM DESCRIPTION

PURPOSE
The knock sensor (KS) system enables the engine control module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The ECM uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock.

SENSOR DESCRIPTION
The knock sensor (KS) system uses a flat response 2-wire sensor. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration, or noise, level. The amplitude and frequency are dependant upon the level of knock that the KS detects. The engine control module (ECM) receives the KS signal through a signal circuit. The KS ground is supplied by the ECM through a low reference circuit.

The ECM learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The ECM uses the minimum noise level to calculate a noise channel. A normal KS signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the KS signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the ECM only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If knock is present, the signal will range outside of the noise channel.

If the ECM has determined that knock is present, it will ****** the ignition timing to attempt to eliminate the knock. The ECM will always try to work back to a zero compensation level, or no spark ******. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the ECM, the KS wiring, the KS voltage output, or constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise.

Check the return spring position with the other side drum for comparison.

It may be piston slap. This is caused by either engine wear with the piston bores being too large for the pistons, or by poor manufacturing tolerances, or a combination of both.

To test for this, start the engine up first thing in the morning and run it for about thirty seconds while you listen carefully and memorise the sound and intensity. Turn the engine off quickly, remove the spark plugs and put two squirts of motor oil into each cylinder. Reinstall the plugs, start the engine up again and listen. If you have piston slap the noise will have been greatly reduced or even eliminated for about thirty seconds seconds and then returns.

The fix is to rebuild or replace the engine, but if it works just fine then don't worry. Many slappy engines keep going for tens of thousands more mile. The fact that your knocking is only at idle suggests your crankshaft is not to blame.

yes this code is a coil issue and without getting very deep it can be triggered by a defective spark plug, the knock sounds like maybe a carbon knock, run a coup[le of cans of upper cylinder cleaner in the gas tank when u fill, STP gas treatment is one of these products, if the knock persists then have the dealer check for a hard carbon problem in cylinder's or a possible piston or engine rod bearing noise.