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My engine is knocking and I need to what it could be from?

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  • Anonymous Jan 27, 2009

    a small kncking when i first start it

  • dkessel64 Feb 09, 2009

    son drove it over the weekend, on the way home it started knocking loud. Was 3 qts low oil, and trans fluid is also low. No leaks on driveway. Neighbor came and looked it over and says the motor's toast.

  • yadayada
    yadayada May 11, 2010

    when does it knock? wh is the sound like? a metallic rattle or a loud knock? loud cold gets quite hot?

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Ford f-250 that has knocking noise coming from motor and mettalic knocking

Posted on Feb 04, 2009

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My Infiniti Q45 Has a knock sensout that is out..Left bank. Would this cause my engine to have a loud knocking sound? Sometimes it knocks and other times it's quiet. I took it to a mechanic and he t


I would go with the engine being bad.
A knock sensor only sends a signal to the engine computer when there is a vibration or noise like a spark knock. The computer then adjusts spark timing to compensate.
If the engine is knocking such as a bearing knock, the sensor will be activated.

Jan 31, 2014 | Infiniti Cars & Trucks

1 Answer

Emission code P0326


P0326 - Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor) High Voltage
Knock sensors are used to detect engine pre-detonation (engine knock or ping). The knock sensor (KS) is usually a two wire sensor. A 5 volt reference is supplied to the sensor and there is a signal return from the knock sensor to the PCM (powertrain control module). The sensor signal wire informs the PCM when a knock occurs and in what degree of severity. The PCM will ****** the spark timing to avoid pre-detonation. Most PCMs have the ability to learn spark knock trends in the engine during normal operation.

If the PCM determines that the knock is out of the ordinary or that the noise level is abnormally high, P0326 may set. If the PCM senses that the knock is severe and cannot be eliminated by retarding the spark timing, P0326 may set. Keep in mind that knock sensors cannot distinguish between a knock from pre-detonation or one from engine problems.

Symptoms of a P0326 DTC may include:
MIL (Malfunction Indicator Lamp) illumination
Audible knocking from the engine compartment
Pinging from engine under acceleration

Potential causes of a P0326 code include:
Knock sensor connector is damaged
Knock sensor circuit is open or shorted to ground
Knock sensor circuit is shorted to voltage
Knock sensor has failed
Moisture in knock sensor connectors
Incorrect fuel octane
PCM has failed

Possible Solutions:
If an engine knock can be heard, fix the source of the mechanical problem first then retest. Make sure the proper octane of fuel was used in the engine. Using lower octane fuel than what is specified can cause a ping or pre-detonation and may cause P0326.

Unplug the knock sensor and check for water or corrosion in the connector. If the knock sensor has a seal, verify there is no coolant from the engine block fouling the sensor. Repair as necessary.

Turn ignition to run position with engine off. Ensure that 5 Volts are present at the KS connector. If there is, check for proper resistance between KS terminal and engine ground. You will need a vehicle specification for this. If resistance is out of specification, replace the knock sensor. If resistance is normal, plug KS back in and idle the engine. Using a scan tool in datastream, observe KS value. Does it indicate a knock is present at idle? If so, replace the knock sensor. If the knock sensor shows no knock at idle, then tap on the engine block while observing the knock signal. If it doesn't show a signal that corresponds with the taps, replace the knock sensor. If it does, verify the knock sensor wiring isn't routed next to ignition wires. If there was no 5 volts present at the knock sensor connector while unplugged with KOEO (Key on engine off) then go back to the PCM connector. Turn ignition off and clip the knock sensor 5 volt reference wire in a location that is easy to repair (Or remove the wire from the PCM connector). With KOEO, check for 5 volts on the PCM side of the clipped wire. If 5 volts isn't present, suspect a bad PCM. If 5 volts IS present, repair short in 5 volt reference circuit.

Since the reference circuit is a shared circuit, you will need to check all engine sensors that are fed a 5 volt reference. Unplug each sensor one at a time until the reference voltage returns. When it returns the last sensor you plugged in is the shorted sensor. If no sensors are shorted, check the wiring harness for short to voltage on reference circuit.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Feb 15, 2012 | Cars & Trucks

2 Answers

GMC 4.3L DTC P0330 flashing MIL


P0330 - Knock Sensor 2 Circuit Malfunction (Bank 2)
A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block. This P0330 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0325.

Symptoms: You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms.

Causes: A code P0330 most likely means one or more of the following has happened:
The "B" knock sensor is faulty and needs to be replaced
There is a wiring short/fault in the knock sensor circuit

Possible Solutions:
Check the resistance of the knock sensor on bank 2 (compare it to factory specs)
Check for broken/frayed wires leading to the sensor
Replace the knock sensor on bank 2


Hope helps.

Aug 23, 2011 | GMC Safari Cars & Trucks

1 Answer

I have a code p0325 knock sensor 1, circuit bank 1 or single sensor problem


A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block.

This P0325 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0330.

Symptoms: You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms.

Causes: A code P0325 most likely means one or more of the following has happened:
* The knock sensor is faulty and needs to be replaced
* There is a wiring short/fault in the knock sensor circuit

Possible Solutions
* Check the resistance of the knock sensor (compare it to factory specs)
* Check for broken/frayed wires leading to the sensor
* Replace the knock sensor


Test it and tell us news.

Mar 15, 2011 | 1999 Nissan Maxima

3 Answers

Diagnostic code po325 what does this mean


Hi the error code relates to the PCM Knock Sensor Circuit

A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. The knock sensor generally threads into the engine block. This P0325 code may show up intermittently or the Service Engine light may be lit constantly.
Symptoms

You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms.
Causes

A code P0325 most likely means one or more of the following has happened:

* The knock sensor is faulty and needs to be replaced
* There is a wiring short/fault in the knock sensor circuit

Possible Solutions

* Check the resistance of the knock sensor (compare it to factory specs)
* Check for broken/frayed wires leading to the sensor
* Replace the knock sensor

Hope this helps
Steve

Mar 03, 2011 | 1993 Jeep Grand Cherokee

1 Answer

I have a 2004 pilot, VTS4 and engine light came on. i have a p0325 knock sensor circ. bank A. just replace the sensor?? also i can seem to find any diagrams. any help appreciated!!!


It does sound like the sensor may be bad, but you also need to check the wiring.
This information comes from:

http://www.obd-codes.com/p0325

P0325 OBD-II Trouble Code Technical Description

Knock Sensor Circuit Malfunction
What does that mean?

A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block. This P0325 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0330.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook Symptoms

You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms.
Causes

A code P0325 most likely means one or more of the following has happened:

Possible Solutions
  • Check the resistance of the knock sensor (compare it to factory specs)
  • Check for broken/frayed wires leading to the sensor
  • Replace the knock sensor

Mar 02, 2011 | Honda Pilot Cars & Trucks

1 Answer

P0327 knock sensor code 00reodo


The knock sensor detects engine detonation, allowing the powertrain control module (PCM) to ****** ignition control spark timing based on the knock sensor (KS) signal being received.

The knock sensor produces an AC signal so that under a no knock condition the signal on the KS circuit measures about .007 V AC. The signal amplitude and frequency are dependent upon the amount of knock being experienced.

If an engine knock can be heard, repair the engine mechanical problem first. If there is no apparent engine trouble, check the KS signal circuit for a poor terminal connection at the PCM. If a problem was found, replace the terminal.

Check the KS signal circuit between the PCM and the KS connector for an open, a short to voltage, or a short to ground.

You can measure the resistance of the knock sensor by connecting a digital volt meter (DVM)between the PCM connector and the engine block. It should read abot 100K ohms. If it doesn't, you should replace the knock sensor.

If the resistance is ok, then you can connect the DVM to monitor AC voltage between the PCM connector and engine ground. Make sure the engine is off and the PCM is disconnected. Tap on the engine lift bracket with a socket extension while observing the signal indicated on the DVM. If any signal is indicated on the DVM while tapping on the engine lift bracket, then the PCM needs replaced. If replaced, this unit needs to be reprogrammed.

Feb 24, 2011 | 2000 Isuzu Rodeo

2 Answers

My truck is making a loud knocking sound when I drive it


first you need to check the oil level (with engine off) if level is good than listen to engine knock with the hood open make sure it is coming from the engine and not the belt tensioner or something external on the engine,if nothing is found than engine will need to be repaired best thing is to bring it to a local shop for evaluation.best not to drive it much longer like this ,it could leave you stranded.

Nov 25, 2010 | 1994 Isuzu Trooper

2 Answers

Service engine light


Your not going to here any knock from the engine the knock sensor detects detonation which is not detectable with the human ear. if you want to test the knock sensor you can tap the side of the block the engine should stumble for a couple of seconds if it does not change then the way the engine runs then the knock sensor is defective or hase buildup iside the engine and you will need to do a top engine clean. if you want instructions on how to do this just post another post to this reply This happens on engines that ave high mileage or acar that runs low grade like regular.

Apr 16, 2010 | 2004 Mini Cooper

1 Answer

1997 LeSabre has engine "knock"


If it knocks at 50 it will knock sitting still if you race it up. Is the oil pressure good? These motors hardly ever have a bearing problem. The only knock problem was the harmonic balacer that comes apart and knocks. The rubber falls apart and it will make a knock sound all the time, more with the ac on. If you have a knock at 50 or highway speed only you may need a outer tie rod end only. Get the front end checked as they will make a knocking sound on the highway. reply

Nov 08, 2009 | 1997 Buick LeSabre

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