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if its a diesel engine sounds as if you either have a fuel supply restriction or high pressure injection pump needs timed or replaced , if it's gas engine i have seen this happen to a car before turned out to be a faulty engine crank pos sensor, never threw a code in ecm but a ck on the old laptop plugged in (obd II) said that engine was hitting rev limit (at just above idle)
On both cars the knock sensor is located in the intake valley.
the computer receive signals if engine knocking and adjust the timing till stop.Before replace the sensors make sure the engine have no other misfire ,bad gas or vacuum leak.plug scan tool and read the code.Only circuit problem will be a true knock problem. Inspect all wire connectors before start taking a part.
The car should start without the knock sensors, why would you change the knock sensors? They are a piezo quartz generator that rarely go bad. Usually other symptoms of engine faults produce a code that say there is a knock sensor problem. Back to the no start thing, maybe you may have caused a unrelated problem. Bad reconnection or something. Retract your steps to see if you did something wrong
Error Code:P0325 Description:
Knock Sensor (KS) 1 Bank 1 - Circuit Malfunction Possible Cause:
Loss of power.
Poor connection, short to earth, short to positive, open circuit.
Knock sensor improperly torqued.
Engine control module (ECM).
Torque Knock Sensor 1 to specifications.
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.
Check Knock Sensor 1 and Knock Control.
This feature search for unusual (spontaneous) combustion. The sensor detects unusual vibrations and based on that it generates a voltage. Is this voltage outside a certain limit a DTC will be set.
thanks, that helps. It could be that is the only problem. The knock sensors started being installed several years back to provide performance feed back to the ECM/PCM. If a cylinder doesn't fire the knock sensor reports a misfire to the computer and a misfire code is shown. In this event the sensor is returning a value that indicated to the computer it was not functioning correctly. Replacement of this sensor doesn't require the motor to be rebuilt should cost around $200 at a dealer maybe a little more. You can view the knock sensor a little like the O2 sensor with the main difference being that if the knock sensor doesn't work correctly it could cause the vehicle to computer to adjust your timing the wrong way.
before you start taking stuff apart, make sure that the knock sensor is bad and not the wires. test for ground and continuity on the signal wire from the sensor connector to the pin on the pcm connector. google "testing knock sensor" for more info
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.
To replace it is very very hard due to its location. BUT... it is quite simple to take care of if you understand what a knock sensor is. It is just a sound detector. It listens to the engine and if it hears detonation, then it signals. So you need a sensor that works, but if it hears nothing who cares? Thus, fixing the problem (you have a code) is easy. Buy a new knock sensor. Mount it to the body of the car anywhere that is grounded. Like the sheet metal above the engine manifold. Now reroute the wires that run to the old sensor to this new sensor. Leave the old sensor (now disconnected) where it is. You will need to get the manual (ebay) to locate the wires. Oh - the white wires turn yellow with time. That yellow wire is white. The new sensor operates perfectly, but it never hears anything. Problem solved. F&*K-off you guys at the DMV and the EPA!
yes its related to knock sensor because car is running rich in fuel, and car runs of on safe mode, so overdrive will be off. have you and a friend replace it. remove intake assembly, then intake manifold, but first remove your anifreeze from radiator, trust me you want to remove antifreeze! their are brackets by the fire wall to hold down the manifold, thats the hard part is taking it off and putting that on since not to much space to work on it. on the block you'll see the two knock sensors, has 2 wires each, knock sensors cost between 150- 200 a piece, still cheaper than dealership putting it on. also buy some liquid gasket because you will need that. after putting it all back together reset the ecu and you should be fine,