Prevenge
NAXJA Forum User
- Location
- Quesnel , BC , Canada
Ok so my XJ (1988, 4.0,auto) dropped dead on me while driving home ....just instant death and wouldnt start even though it turns over fine. I have verified fuel but testing for spark was a negative. I have checked the yellow wires on the ignition module ... large one gave close to battery voltage, smaller gave what i assume is voltage supplied from the ECM (cant remember the exact number but i think was 5 or 6 volts) with ign on and not running. I checked the resistance of the coil-to-distributer wire and it seemed ok for it's length.
After some internet scouring i believe I should be directed towards the crankshaft position sensor that everyone loves so much. I tried the unplug,wait,replug trick and nothing. ohms between the two terminals is within , what i have been told is, the acceptable parameters. I think it was 190 ish? I then tried checking the AC voltage on the same plug while cranking and got a bout a quarter of a volt. That is what i have read considered a replacement reading for this sensor, correct?
Anyways my question is basically the title of the thread. Does a faulty CPS usually result in a absolute no spark scenario? and also there is an intermittent "sucking" noise coming from somewhere around the intake while I crank it over...is that normal? Thanks for any help~!
After some internet scouring i believe I should be directed towards the crankshaft position sensor that everyone loves so much. I tried the unplug,wait,replug trick and nothing. ohms between the two terminals is within , what i have been told is, the acceptable parameters. I think it was 190 ish? I then tried checking the AC voltage on the same plug while cranking and got a bout a quarter of a volt. That is what i have read considered a replacement reading for this sensor, correct?
Anyways my question is basically the title of the thread. Does a faulty CPS usually result in a absolute no spark scenario? and also there is an intermittent "sucking" noise coming from somewhere around the intake while I crank it over...is that normal? Thanks for any help~!