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Re: engine noisy checked code and found knock sensor bad.
Engine noisy,used one of them sunday mechanics code readers and reckon you know it all now ???only one cause of a noisy engine and thats because its been run with no oil,or had the guts thrashed out of it,or a pulley tensioner bearing run dry,clutch thrust bearing ,water pump,in fact anything .GET A PROFESSIONAL TO LISTEN,call a local mobile mechanic for an opinion then ask how to cure it on the cheap.
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The knock sensor is generally very reliable and the ones I have tested have been capacitive and I tested them with an old LCR bridge.
The knock sensor is essentially a microphone that will detect knocking or detonation caused by bad fuel or overheating or too much ignition advance and the ECU will retard the timing to protect the engine.
A few early electronic management systems were programmed to periodically advance the timing until detonation was heard by the knock sensor when it would retard until the knocking stopped thus maintaining the maximum pressure on the pistons for the fuel input.
The mechanical safety of the engine is placed at risk if it is run with a bad sensor, though a bad sensor should cause the engine brain to use its pre-programmed values to compensate.
The knock sensor is located on the right side of the engine (passenger side) if looking from drivers seat, here is a diagram to help you locate the sensor and also enclosed is a picture of the sensor. hope this is helpful, good day.
Your local auto parts store, or auto parts superstore should have it, if not, be able to order it. Ex.--Advance Auto Parts store has a BWD Knock Sensor, #S8815, for around $50.00. 2002 Kia Rio 1.5L/L4/FI
Turn ignition off. Disconnect knock sensor 3 - pin harness connector. Locate knock sensor, on cyli nder block. On Optima 2.7L engine, sensors are located on both sides of cylinder block. . Remove knock sensor from cylinder block. To install, reverse rem oval procedure.
remove the intake manifold ,remove radiator ,remove radiator intake and outake housing, remove fan ,remove all belts: power steering, alternator and if you have a/c, remove harmonic balancer ,remove timing belt covers, remove timing belt remove intake housinng once you have remove all the above, your freaken engine will look naked, you can see the location of the knock sensor is locate in the engine valley u might wanna google knock sensor so u knoe what it looks like