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Knocking noise engine

Engine knocking noise

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Could be rod bearings.

Posted on Aug 26, 2014

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2 Answers

Does a knock sensor sound like a rod knocking


Knock Sensor contains no moving parts and can not make any noise. It only detects noise in the engine block to allow the engine control computer to make adjustments as needed.

Dec 12, 2016 | Cars & Trucks

1 Answer

Makes knocking noise that sound like something is loos banging only when jeep warms up and only in gear


TROUBLESHOOTING ENGINE NOISES
A KNOCKING SOUND IN THE ENGINE IS MOST LIKELY CAUSED BY ONE OF THE FOLLOWING
1. PISTON SLAP: Makes a sharp metallic noise. Idle engine and short out each cylinder plug. The noise will disappear when plug with bad piston is shorted. Noise will also disappear at acceleration. This can be caused by worn or out of round cylinder, or broken piston ring. Correct problem by re-boring cylinder and/or replacing piston.
2. VALVE NOISE: Makes clicking or rattle noise. Caused by excessive wear on valve stem or lifter, out of adjustment, or stuck valve. Correct by adjusting valve clearance, replace worn valve or lifter, regrind cam, replace valve guide and /or valve. A stuck valve can sometimes be loosened by passing oil through the carburetor while engine is running.

3. ROD BEARING KNOCK: Makes sharp metallic noise similar to a piston slap. Detection is opposite of piston slap. Rod knock is not heard at idle. Knock becomes louder as engine speed is increased. Caused by excessive rod bearing clearance. Correct by adjusting rod bearing clearance to .0015 inches by removing shims. May require re-pouring rod bearing.
4. REAR MAIN BEARING KNOCK: Makes dull knocking or thud noise. Detected at speeds between 20 and 50 MPH. Knock will normally decrease or disappear while pulling or decelerating. Noise will be detected the loudest at normal driving speed, when not pulling or decelerating. Correct by adjusting bearing clearance to .001 to .0015 inches. If knock is excessive, crank should be checked for out of roundness. May need to re-pour all main bearings to correct.
5. TIMING GEAR KNOCK: usually the most difficult to diagnose. If gear is loose or badly worn it will knock in all ranges. Run engine slightly above idle speed. Slowly open and close throttle. Knock will continue to be present, but just as engine slows down knock will become a slight rattle. Remove timing pin and reinsert into timing hole on timing gear cover. Press timing pin tightly against timing gear and accelerate slightly above idle. Knock will significantly be reduced or disappear. Correct by replacing both timing gear and crank gear as a matched set. The two gears should have a backlash clearance of .003 to .004. If more than .009 inch backlash, an oversize (.005) timing gear should be installed.
6. WRIST PIN SLAP: This can not be detected by shorting out the cylinder plugs. Rapidly accelerate and decelerate the engine speed. The engine will pass through a certain speed range when the wrist pin will rattle at about the same pitch as a valve tappet noise. This can be corrected by installing a new wrist pin bushing in the rod or new wrist pin f badly worn. Wrist pin should fit the piston and connecting rod with a tight metal to metal fit. The pin can be pushed into the piston and rod with a slight pressure of the hand. Pin to rod clearance is .0003 to .0005 inches.

Dec 07, 2013 | Jeep Cars & Trucks

1 Answer

If knock sensor damage can start the vehicle


The knock sensor was designed as a listening device for the vehicle's engine. It is used to detect engine noises such as detonation, when fuel ignites in an engine's cylinder, as well as adjusts the ignition timing when the vehicle is being driven. When a knock sensor is not working properly, it may cause permanent engine damage. Therefore, there are various symptoms to aid in recognizing a faulty knock sensor.

Check Engine Light
Engine Noises
Additional Symptoms
Careucar

Jun 21, 2013 | 1999 Nissan Maxima

1 Answer

Not getting oil to the pistons. Making knocking noise. Wont stay on.


Hello
Has the engine been run low on oil? Does the knocking get louder as the engine warms up? Have you had a automotive technician listen to this noise? Pistons don't really knock, the bearings in the engine called the crankshaft and piston connecting rod bearings do make a loud knocking noise, if that is the case the engine must be removed from the car and rebuilt.

Sep 23, 2011 | 1998 Honda Civic

1 Answer

What is engine knocking noise


Engine knocking noise is that sound from the engine that sounds like a knock. It is caused when there is an increased metal to metal contact, due to friction n wear of parts n it is mostly associated wid insufficient circulation of engine oil to the engine parts hence increase in friction n the noise. It is a warning to be taken seriously or the engine might finally pack up. This is what we finally refer to as a knocked engine. Sometimes in such extreme cases replacement might be d only solution.

Sep 07, 2011 | 2001 Chrysler Sebring

2 Answers

Remove the spark knock sencer on a 1997 dodge caravan


It depends on which engine your Caravan is equipped with. The knock sensor on the 2.4L engine is on the forward side of the engine just below the intake manifold. On the 3.3L and 3.8L engines it is on the forward side of the engine right next to the oil filter. All engines: Disconnect the electrical connector and unscrew the sensor from the engine block. Reverse procedure to install.

It should be noted that knock sensor failures are very rare on these vehicles. Most knock sensor fault codes for these engines are usually caused by mechanical problems that are creating "rattling" or "knocking" noises in the engine compartment. Things like bad pulley bearings, worn water pumps or loose timing components are most likely at fault. The knock sensor does not know the difference between vibrations caused by these type of failures and those that are caused by ignition ping. The fault code usually sets when the noise or "knock" is still present when the Powertrain Control Module (PCM) has retarded ignition timing as far as possible. If any knocking or rattling noises are present in the engine area, this should be diagnosed and repaired before replacing the sensor. (Otherwise you will only be wasting your money.)

Jun 11, 2011 | 1997 Dodge Caravan

1 Answer

WHERE IS THE KNOCK SENSOR ON A 2006 CHEVY COBALT TO REPLACE IT.


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.

Feb 24, 2011 | 2006 Chevrolet Cobalt

1 Answer

I have heard a knocking noise in my engine for the past year, and it was knocking when I purchased it. Is it likely to be a rod knock, or would have the engine failed by now.


Well, if the knocking noise is like once a second, it could be a camshaft bearing.
Some engine builders consider a knocking in the engine as a failure in the engine and recommend a rebuild, if economically possible.

How does it drive?

Nov 06, 2010 | 2004 Pontiac Sunfire

2 Answers

Im receiving a knocking noise from the engine


IF IT IS A NOISE THAT IS VERY LIGHT CHANGE TO A HIGHER OCTANE OF GAS. IF IT IS A DEEP LOW & LOUD KNOCK. THE MAIN ENGINE BEARING ARE WORN OUT

May 20, 2010 | 2004 Chevrolet Suburban

1 Answer

1996 bmw 323i m52b25 slight knocking noise from engine between


take rubber hose and place near ear use as stethoscope, pin point noise, and pull apart, till problem is located. buy manual

Sep 12, 2009 | 1994 BMW 3 Series

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