Question about 2004 Chevrolet Silverado 2500HD

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Can knock senor cause a engine to go to reduced power

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Yes. The sensor is supposed to notice vibration such as spark knock and the computer would reduce spark timing to correct it.

Posted on Feb 11, 2014

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Posted on Jan 02, 2017

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1 Answer

What problems can the knock senor cause?


The knock sensor adjusts the timing dependent on load conditions of the engine. It also compensates for changes in the fuel octane rating. If the engine is pinging or detonating it can damage the pistons and in the worst case under heavy load actually burn a hole in the top of the piston. This sensor also effects the milage.

Nov 13, 2015 | 2007 Chevrolet Silverado 1500 2WD

2 Answers

I have a 2005 mercury sable the. check engine light came on. I took it to AutoZone and the readings said it's running lean. Wht does that mean and what could be the cause?


It means that the engine is running lean which can cause engine knock. When the knock sensors detect excessive knock they set the check engine light.
Low fuel pressure.
Dirty fuel filter.
Dirty or bad MAF sensor.
Bad MAP sensor.
Vacuum leak.

Bad injector.

Jun 07, 2015 | 2005 Mercury Sable

1 Answer

01 chevy Silverado 2500 misfires multiple cylinders replace 02 sensor map sensor fuel injector cleaned maf sensor it is throwing a code for knock senor 2 circuit my question is can a knock senor be bad...


No a knock sensor can not make a misfire. Check the coils, plugs and fuel pressure .The random misfires are cause the knock sensor to throw the code.

Jul 02, 2014 | Cars & Trucks

1 Answer

The reason for the reduced engine speed indicator


The reduced engine mode ( limp mode ) will activate when the sensor parameters are exceeded and the CPU recognises this as a potential damage to the engine and/ or gear box. It could be low oil level / pressure or coolant level low/ over heat or any number of sensors that protect the drive train. check the oil level and coolant level and have the fault codes read asap

Jan 26, 2014 | 2007 Pontiac Grand Prix GXP Sedan

1 Answer

If i have a diesel engine and my tank is 80 litre and put 70 litre diesel and 10 litre petrol in my tank what will happen to my diesel engine than


That depends on the amount added and the engine, yours would be 7 parts diesel to 1 part gas. I do not have the different effects on engines using different ratios of deisel to gas, I suspect the richer the mix ratio of gas to deisel, the more noticable the reactions will be. First off there are two immediate impacts of diesel fuel mixed with gasoline: the octane is lowered and the fuel vaporization is reduced. The lowered octane may cause the engine to knock. Some engines have knock sensors and the electronic controls that will adjust the timing and other engine conditions to try to control the knock. If the knock remains significant it can damage the engine by causing metal fatigue eventually leading to failure of critical parts like pistons, connecting rods, heads. Some very old engines (e.g. 1950's tractors) can accomodate lower octane, but the ones found in recent autos are normally running close to the knock threashold. The reduced volotitility caused by the added diesel will cause hard starting and will probably result in some unburnt hydrocarbons remaining in the exhaust gas from the engine; these may be reacted in the catalytic convertor causing it to overheat. A modern electronic controlled emission system controls the oxygen level in the exhaust gas going to the convertor so the significant increase in hydrocarbons with controlled oxygen may save the convertor, but will likely result in unburnt hydrocarbons exiting the exhaust. This will result in a smell and air pollution. Gas will also damage deisel fuel pumps as well.

Dec 15, 2013 | Cars & Trucks

1 Answer

Is it true that a damaged knock sensor can slow down or make the car lose power while going uphill? Toyota Corolla VE 98


Yes it can. The knock sensor retards the timing due to irregular levels of octane in todays gasoline, to eliminate or reduce what is called a spark knock. A malfunction could cause your car to lose power when car is under a load or uphill due to pre detonation or constantly retarded spark to the engine. If not replaced it can cause engine damage or head gasket damage. Hope this helps.

Jun 15, 2011 | Toyota Corolla Cars & Trucks

2 Answers

Location of knock senor on 97 maxima se


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.

May 15, 2009 | 1997 Nissan Maxima

1 Answer

How to replace knock senor switch on 2002 mazda protege 5



Removal & Installation

  1. Disconnect the negative battery cable.
  2. Remove the intake manifold.
  3. Disconnect the sensor connector.
  4. Remove the sensor from the engine block.
  5. Installation is the reverse of the removal procedure.

    0900c1528019fa95.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Knock sensor removal and installation-Mazda 3

  1. Disconnect the negative battery cable.
  2. Remove the intake manifold bracket.
  3. Disconnect the sensor connector.
  4. Remove the sensor from the engine block using special tool 49H018001 or equivalent.
  5. Installation is the reverse of the removal procedure.

    0900c1528019fa96.jpg enlarge_icon.gifenlarge_tooltip.gif GL G

May 09, 2009 | 2002 Mazda Protege

1 Answer

What is a knock sensor? And could this cause a car to lose power?(2002 Kia Spectra)


A knock sensor is simply a microphone that is screwed into the engine block. It is there to listen for pinging or engine "knock" that is caused by poor fuel or extreme load. When the computer hears the knock, it retards timing, which in turn reduces the tendency for knocking, however, it will reduce power to a certain extent as well. It is possible that a faulty knock sensor can be telling the computer to ****** ignition timing too much, it is also possible that there is a mechanical problem within the engine that is mimicking the sound of knocking and retarding timing as well.

Mar 11, 2009 | 2002 Kia Spectra

1 Answer

Engine knocking


does it have a knock senor? fuel cut due to knocking may occur

Mar 04, 2009 | 1994 Toyota Corolla

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