After replacing both crank & cam shaft positioning sensors truck starts but cuts out. What direction do I go now?

Asked by Feb 26, 2017 at 05:28 PM about the 2002 Ford F-150 XLT SuperCab 4WD SB

Question type: Maintenance & Repair

Issue began with truck not starting at all. Replaced crankshaft sensor first, it
started but was cutting out. Then I replaced the camshaft sensor and still is
cutting out.

13 Answers

76,365

I would have the vehicle scanned for any trouble codes. Write them down if there are any, and there should be some stored. This will let you know what to look at for repair.

Have already done that. Only one code - P0320. What seems to be confusing to me is the "Ignition/distributor/engine speed sensor". Not sure what it is exactly I'm looking for to order or where to find it on my truck.

76,365

Check this out.... https://youtu.be/mFZFjN8v9f4

I'll check that out (my truck) this week and see if I can find anything. Good thing is I don't need to drive it to work.

76,365

I'm looking to see if I can find the speed sensor.

76,365

Ok, chances are you are looking for a frayed wire, bad wire in the engine speed sensor circuit.

76,365

Found what it looks like... https://www.carid.com/2002-ford-f-150-transmission-parts/motorcraft-speed-sensors-72004924.html

Just seemed like once the crankshaft sensor was replaced and it started right up, I thought my problem was solved. Frayed wire does make sense provided I can locate it.

So where does that sensor install?

76,365

I don't think that was the right one. There looks to be several speed sensors, trany, wheels, have not found the one for the engine distributor yet.

76,365

Hear is some information on the po320....P0320 FORD Description Ignition failure sensor is used to check whether the spark ignition is occurred correctly or not and also used to tachometer drive. The sensor monitors the voltage difference between a resistance which is on the battery circuit for ignition coil. When the ignition coil works properly, the electric current through the resistance is detected as voltage drop. This is confirmed for every ignition event with the crankshaft sensor and the camshaft sensor. If Engine Control Module (ECM) detects a malfunction, no ignition is possible, so the engine would not start. If there is no ignition signal for a predetermined cycle for one or two ignition coils, an ignition coil circuit failure exists.

76,365

More info for you, still need to locate that circuit tho....P0320 2002 FORD F150 - Ignition/Distributor Engine Speed Input Circuit Malfunction...Possible causes; Faulty Ignition/Distributor engine speed sensor, Faulty Crankshaft Position sensor, Ignition/Distributor engine speed sensor harness is open or shorted, Ignition/Distributor engine speed sensor circuit poor electrical connection, Low battery charge, Faulty Engine Control Module (ECM)...The P0320 code is triggered when the Engine Control Module (ECM) detects that there is no current at the ignition coil group Possible symptoms Engine Light ON (or Service Engine Soon Warning Light) Lack/Loss of Power The engine may be harder to start The engine may stumble or stall P0320 2002 FORD F150 Description Ignition failure sensor is used to check whether the spark ignition is occurred correctly or not and also used to tachometer drive. The sensor monitors the voltage difference between a resistance which is on the battery circuit for ignition coil. When the ignition coil works properly, the electric current through the resistance is detected as voltage drop. This is confirmed for every ignition event with the crankshaft sensor and the camshaft sensor. If Engine Control Module (ECM) detects a malfunction, no ignition is possible, so the engine would not start. If there is no ignition signal for a predetermined cycle for one or two ignition coils, an ignition coil circuit failure exists.

76,365

I have read a lot on this code. There is a lot to it. One forum said they replaced the two wires from the crankshaft sensor back to a big plugin, which took care of the problem. Most everything I have ben reading indicates a wiring problem. Another forum said to unplug the alternator while it is running to see if the engine smooths out, that there could be RF frequencies interfering with the circuit. The fix was to replace the alternator. Another RF interference is if there is a two way radio not properly installed. So there seems to be a lot on this code and a lot of different things to check. Do some research and write down the fixes, and start with one until you get it.

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