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Knock Sensor. The heart of your vehicle's engine management system-that's what your car's knock sensors are. Knock sensors enable your vehicle to achieve the maximum combination of fuel/air mixture and timing to increase power and efficiency generated. The general aim is to waste less gas and save more money.  Best Answer: Knock sensor only retards the timing during spark knock and ping. A P0325 code (defctive non functioning) Knock sensor will not cause loss of power. More likely fuel pressure replace that fuel filter. Next suspect is voltage readings on the air flow meter signal wire 4.0 volts at wide open throttle. Posted. 1999 impreza outback sport...Check engine light is on and the code is for the knock sensor. When going up hills, or off the bat in 1st the car will stutter and/or lose power. For example a small hill in 4th gear at low rpm will make the car stutter and force me to downshift due to the lack of power.  A faulty knock sensor can cause engine hesitation, or jerking, while in gear. Faulty knock sensors may send incorrect signals to the ECU, causing it to change ignition timing, which in turn can result in engine hesitation. Under these circumstances, the knock sensor often requires replacement. A knock sensor causing engine shaking or rough idle often results in a service engine light or code warning. The driver can check against factory code lists for that particular vehicle to confirm the cause, then inspect the knock sensor for proper resistance, replacing it if necessary. When you start a car/truck, the knock sensor allows the PCM to adjust timing by sensing pinging or knock immediately. This allows the engine to get the most power out of the fuel you happen to be running. If the knock sensor malfunctions, the PCM just runs a default timing routine (like running 87). Detonation can be caused by several factors; low octane fuel, too much spark advance, or a lean fuel mixture. The knock sensor will send a signal back to the PCM (power control module) to lower advance and/or enrichen the It is tuned to listen to the exact frequency of an engine knock, which is a high frequency ping. A failing knock sensor will cause all sorts of problems to engine operation, such as skewed timing controls, loss of performance and power and ever the system going to linp-in mode. Learn how it works and how to test this incredible component.  You don't say what year, model or type engine, but from your discription of the problem I would say you have a bad knock sensor. This will cause the pinging, power loss and excesive fuel consumption. dirk d · 8 years ago. Thumbs up.  It detects cylinder knock (caused by detonation). Detonation can be caused by several factors; low octane fuel, too much spark advance, or a lean fuel mixture. The knock sensor will send a signal back to the PCM (power control module) to lower advance and/or enrichen the fuel mixture. If you are suspect this is going on, have it checked ASAP, as valve and piston damage can happen The knock sensor retards the engine timing when there is a knock or ping detected. This will make the car a little sluggish. It is rare that the knock sensor goes bad. your battery will not lose power due to your starter being bad. if you have attempted to start the engine and did this for a long period of time with out the engine or a … n out side source of power charging the battery, it will eventually lose power, due to working and not charging.
http://www.carparts.com/knock-sensor https://answers.yahoo.com/question/index?qid=20120327175424AAr9xdc http://www.ultimatesubaru.org/forum/topic/113428-power-loss-at-low-rpmknock-sensor/ http://www.ehow.com/facts_7680413_knock-sensor-problems.html http://www.f150forum.com/f4/knock-sensor-question-30680/ http://www.youtube.com/watch?v=0xI94ZDF54Y https://answers.yahoo.com/question/index?qid=20070708182225AAfSnfa http://www.f150forum.com/f4/knock-sensor-question-30680/ http://www.answers.com/Q/Will_a_bad_egr_sensor_make_a_car_lose_power
will a knock sensor cause a car to lose power