This has only happened when crankshaft sensor fitted
POSSIBLE WRONG OR DEFECTIVE SENSOR
Maybe catalytic converter clogged
SOURCE: Knock sensor location
Knock Sensor Description
addthis_pub = 'car-suff';
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SOURCE: 2004 Hyundai Santa Fe 3.5L V6 What all do I
Removal & Installation
To install:
Crankshaft Position Sensor
The crankshaft position sensor is located at the front of the engine near the timing belt.
SOURCE: what does a crankshaft sensor do? 04 hyundai santa
The crankshaft sensor is responsible for sending a signal to the PCM (powertrain control module) it tells the computer what cylinder to fire at the coresponding time, it lines up with whats called a trigger wheel on the crankshaft as the crankshaft spins there are small notches cut into the trigger wheel when 1 of the notches lines up with the crankshaft sensor a magnetic field forms between the trigger whell and the sensor and the computer charges the coil for that corresponding cylinder, once the magnetic field dissappears when the notch passes by the sensor the computer fires the spark plug for that corresponding cylinder if you have a bad crankshaft position sensor you will more then likely have a stalling condition due to weak spark or if the sensor is totally gone your engine will just crank and not start due to the spark plugs not having any spark being delivered to them......
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