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Why would the knock senor code light come on still if you already replaced the sensor and pigtail connectors?
The most obvious reason is that you still have a knock that the sensor is picking up. You can try an octane booster or next time you put in gas put a few gallons of high octane in. Then see if problem goes away. But lets say for sake of argument that there is no knock happening.
The sensor works on a process where it vibrates at high frequency. This frequency creates a voltage which is then sent to the computer for inspection. So its putting out a vvoltage even when disconnected. You can put on a good voltage meter and see what its output is. Then rev the engine and continue checking. If the frequency and voltage are OK then the computer sets the program accordingly for fuel injection. If the reading is not OK then it turns on the light and sets the fuel injection volume down.
The signal is critical to performance and needs to have a good ground. I ran an extra ground wire from the battery to a location near the sensor. Then I attached it to the grounded shielding on the sensor wire. This helped for awhile but the real problem was the wire itself. I think the heat and high frequency caused internal leakage in the old wire. So I replaced the whole wire and ran it along the rear of the fire wall instead of in the wire harness. Then reattached the wire to my good ground. This fixed the problem.
Because of the high frequency you have to have a good meter that can read the voltage produced. Some shops will inspect this for free. I will try and find the information and give an update.
What else can I help you with?
On a 2002 Ford Crown Victoria where is the intake air temperature sensor iat located?
if there is not a small two-wire sensor in the side of the air filter box cover, then it is built into the MAF sensor. If it has a separate IAT sensor, then the pigtail for it will actually be off of the MAF sensor harness pigtail.
How do you replace a speed sensor on a 1995 f-250?
speed sensor is located on the rear side and top of differential it is held in place with one bolt disconnect electric pigtail remove bolt, pull sensor out insert new sensor replace bolt reconnect pigtail
What would cause a P0102 diagnostic reading on a 2003 ford f150 when you have already replaced the MAF Sensor?
Check all your grounds
What does code p1129 on a 2006 dodge durango mean?
Closed loop fueling not achieved bank 2 Possible causes - Fuel delivery system - Engine Coolant Temperature (ECT) sensor or wiring connectors - MAP sensor or wiring connectors - O2 sensor wiring or connectors - Engine mechanical system
P0073 error code for a 2003 dodge neon sxt I already replaced the map sensor and air inlet sensor and still the same code the code won't erase at all?
Try replacing the pig tail to the Air Inlet Sensor
How to replace 1999 Subaru Outback oxygen sensor?
Unplug sensor--- sometimes you can get a wrench on the sensor if not you will have to purchase the special socket.Genuine parts are often high so you can get the sensor at an auto store directions are included with the sensor as how to attach the pigtail and ude the heat shrink tubing suppied
I have a 91 Chevy pickup that runs for 15 min then dies has new coil ignitio module and pickup coil?
I had the same problem bud. Remove and inspect the crankshaft sensor. Also clean the connector pigtail inside with a spray for electronic contacts. Inspect the connector pins of the pigtail closely for damage. Get your sensor at Oreillys NOT autozone.
What would cause a 1988 Chevy silverado to stall cut out hesitate or surge when idlng already replaced fuel filer throttle position sensor o2 sensor MAP sensor and you blocked off the egr?
gas pedal cable?, fuel pump?
How do you remove gm input speed sensor?
replacing speed senor is not a hassle. all you have to do is find SPEED SENSOR, all cars are different, in my honda theres 4, i have replaced two already. speed sensor should be on transmission. remove bolts and pull out. simple put in new sensor.
Where are the oxygen sensors located on a 2003 GM Sonoma?
on the drivers side underneath the engine by the front tire. You will notice a pigtail leading to the exhaust in this area. This o2 sensor is the main sensor, there should be a catalytic o2 sensor located after the converter.
Where is the cam sensor on a 1993 grand prix 3.1?
The cam sensor is on the front of the block,just above the timing cover. It is held on with one bolt.There is a pigtail lead coming out and up around the alternator.
Where is iat sensor located on a 1991 camaro?
The iat sensor is in the air filter element. First you take the air filter cover off then you take your air filter out and pick up the housing you will see the only connector with a pigtail. That is your iat sensor!
