No spark on 95 Ranger
No spark on 95 Ranger
11-27-2010, 10:11 AM
It has done this before. Usually, it will randomly do it ONLY AFTER I've shut the truck off. Then, say a couple hours later when I go to leave my house, I'll go back out to start it and it will just turn over, but will not start. So it has had this problem before, although eventually, it ALWAYS started after a given amount of time (no more than 3 hours of waiting)
But the truck cut out on thanksgiving, and still does not start. It also does not have spark. I was thinking 3 things:
1) Could be the coil packs (but the chances of both coils going out at the same time?? Probably slim)
2) The Ignition Control Module (because I think that also controls the spark)
3) The Crankshaft Position Sensor (which I believe controls timing, and if it's out, the computer may not emit any spark at all??)
What do you guys think???
Just to recap, its had this problem before, but it would not start ONLY after it's been shut off. It has NEVER cut out while driving. Dad said coils don't just go bad like this. So perhaps the ICM just went out like this while driving
If you guys have any other suggestions Im all ears. The ICM is $140, so if I dont have to spend that then I dont want to!!!
11-27-2010, 08:46 PM
because the wiring is diff with the various engine sizes, in order to give the steps on troubleshooting this one would need to know which engine you have.
11-28-2010, 05:09 PM
11-29-2010, 02:29 AM
I would be leaning towards the Crankshaft Position Sensor. It only operates on 1-2 volts and if the connections are oily you won't get that. I would back trace the wiring on it from the crankshaft pulley and would clean all the connections with rubbing alcohol.
11-29-2010, 10:42 AM
the crank sensor should have to signals, one for the base timing and rpm information, and another for the coils, and I thought I had a wiring diagram that showed which ones from the sensor was the signal wires, but I can't find it anywhere, and the haynes manual doesn't show, it just shows one wire, that goes to the icm, and also the ecm, and then two other wires that go to the icm. But I know if you aren't getting a pulsing signal to at least two of the wires from the sensor to the icm then you should check your wiring and it may be a bad sensor, and if you are getting signals then probably a bad icm, check first to make sure you are getting power to the icm though, should be a red & light green wire if it is the same on a 95 model for both the power to the icm and crank sensor.
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