Well you really should have the computer scanned for codes, if it is running that bad, there should be a code set in there that will lead you in one direction or another. Checking sensors for glitches and drop outs can be tough without the proper diagnostic equipment. I dont want to lead you in the wrong direction. You haven't said if the check engine light is on or not yet. If you go to Autozone or a parts store, most of them will scan the PCM for free, if there is a code for the crank sensor or something else, it will give you an idea of whats going on. Again I don't want to lead you in the wrong direction. Checking a cranksensor, I would use a lap scope to watch its wave for glitches or drop outs, if there is a code for it in the computer it would be safe to say it has gone bad. Here is an example of what we would be looking for with a lab scope on a sensor (picture 1). MORE INFORMATION is needed to be able to help you. But if you want to check the crankshaft sensor, it is located on the bell housing of the transmission on the back of the engine (picture 2). With the sensor plugged in, back probe the sensor wire and watch for a pulse with a test light while cranking the engine over. Another test is to unplug the sensor and check the resistance of the sensor to make sure it isn't an open circuit inside the sensor itself. Here is another wiring diagram of both the crank and cam sensor. The wires to check are highlighted in yellow(picture 3). Check for a pulse from both sensors.
Images (Click to enlarge)
Saturday, October 1st, 2016 AT 2:44 AM