Engine Knock.....Mystery Unsolved!!!!

check oil level if low add oil ---if oil milky in color like chocolate milk possible internal damage from --blown head gasket-damaged head --the knock from engine usually means that damage to a piston rod has occurred [rod knock] and knock usually doesnt throw an engine code and usually fatal to engine will need a mechanic to diagnose how bad or what extent the noise is with engine

Nathan, 2 Knock's are located under intake manifold.
Check the attached links,
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How To Install Replace Engine Knock Sensor 2000 06 5 3L Silverado Sierra...

Knock sensor 5 3 4 8 6 0 replacement

05 Chevy Avalanche Knock Sensors

4 8 5 3 6 0 knock sensor replacement GM

The pcm uses the knock sensor to monitor for engine knocking, and adjusts ignition timing based on this. If there is no knock sensor present, you will wind up with a hard fault that will keep the check engine lamp on continuously. Also, the truck will go into a more conservative driving mode to prevent knocking.
The knock sensor for a frontier is not terribly expensive, but it is a pain to access on nissan v6s, under the intake manifold

caused by hot and lean.
which engine.??? at least 3 choices.
most have knock sensors. and will not knock.
if it really is knock then that is serious.
knock means detonation or ping.
if its just noise say that,
real PING happens under load.
1: check fuses.
2: check knock sensor for outside damage.
3: SCAN the PCM. do you have any DTC errors/
4: do a full 60k tune up. maybe its lean because the fuel filter is clogged.

There are two knock sensors located on top of the Engine, approximately in the middle of the 4 cylinders at each bank.
To get access to the sensors the black plastic engine cover with the "Jaguar V8" imprinted on has to be removed.

There are two types of knock sensors.
The "old" ones that are of a "screw-in barrel type" and the newer ones that are just bolted on.

I describe the replacement of the bolt-on type knock sensor on Bank 2 in the following documentation on a 1999 XJ8 AJ27 engine.

Be careful!
Knock sensors are piezo electric devices that are very sensitive! If dropped, over-torqued or struck they will probably be destroyed.
As knock sensors are sensitive to a sudden temperature change they are also easily fractured by steam blasting a hot engine.
So handle the knock sensors with great care and let the engine always cool before fitting a new sensor!

Instructions Things You'll Need:

• Metric combination wrench set
• 3/8-inch drive ratchet wrench
• 12 mm socket
• Knock sensor

1. Open the hood, and disconnect the battery negative cable with a wrench.
2. Locate the black rubber air intake tube that runs from the air cleaner box to the throttle body on top of the engine.
3. Loosen the clamp on the air intake tube at the throttle body with a wrench. Grasp the tube and pull it off the throttle body inlet, and move it out of the way.
4. Locate the knock sensor. It's bolted to the engine near the throttle body. Remove the hold-down bolt attaching the knock sensor to the engine block, using a 3/8-inch drive ratchet wrench with a 12 mm socket attached.
5. Follow the electrical lead of the knock sensor to its connector, and simultaneously lift the plastic tab with your hand while gently pulling apart the plug.
6. Remove the knock sensor from the engine bay. Compare the old sensor to your new part to ensure they are identical.
7. Reattach the knock sensor to the engine block by threading in the original holding bolt by hand. Snug the bolt with the ratchet wrench and 12 mm socket. Do not over-tighten the bolt.
8. Plug the new knock sensor into the original electrical plug.
9. Gently push the throttle body air intake tube onto the throttle body. Tighten the hose clamp with a wrench.
10. Reconnect the battery's negative terminal with a wrench. Close the hood.
11. Start your Subaru's engine. Take the car on a test-drive and verify that the spark knock has disappeared.

99 jaguar knock sensor location?

P0332 - Knock Sensor 2 Circuit Low Input (Bank 2)

This sensor signals the engine-control computer when detonation is detected, momentarily retarding ignition timing until detonation ceases.

Most computer-controlled systems use knock sensors to ****** timing when the engine is experiencing pinging or knocking.


Obviously, a faulty knock sensor produces problems that appear to be ignition-system-related. If the knock sensor system does not provide an engine detonation signal to the PCM (powertrain control module), the engine detonates, especially on acceleration.

• The first step in diagnosing the knock sensor and knock sensor module is to check all the wires and connections in the system for loose connections, corroded terminals, and damage.
• With the ignition switch on, be sure that 12 volts are being supplied through the fuse to the knock sensor module.
• A quick check of a knock sensor is to watch the ignition's timing while the engine is running and the engine block is tapped with a hammer.
  • The noise should cause a change in timing.
• The knock sensor can also be checked by tapping near the sensor and watching for an AC pulse on a DMM or lab scope.

I had the same problem. The dealership wanted to charge me $12,000.00. I told them where they could go...The problem with my engine (I also found out this is common with this style,year,whatever) the timing chain busted...NOT the timing belt, but the chain inside. I had the engine rebuilt.

1. How many miles on your car?

2. Is the engine hot, when you try to start the car?

3. Is the engine hot, when you heared the knock noise?