Crankshaft Position Sensor question

[retirednak]

I've been experiencing a cold start issue the last few times I've tried starting my truck. When the temp is around 10 degrees or colder,my truck cranks but won't start. Plugged the block heater for a couple hrs,fires right off. Even if I cycle the key several times,still doesn't want to start. When it does start,I can hear the grid heaters cycling and also watch the amp gauge charge and discharge. Once running,it idles fine,doesn't miss and has plenty of power. No unusual white or black smoke.

The truck has thrown P0336 code once gain after cranking on it. Will a faulty Crank sensor cause this cold start issue,or should I start looking else where? Last time it threw this code,I reset it and forgot about it till now. I'm still running the original lift pump and it seems like its a tad louder and runs a bit longer then it use to be. I haven't done a fuel pressue test and I was hoping I wouldn't have anything crop up till after I have my trans rebuilt this week since I'll be tapped out money wise. Guess I'm lucky at 104K miles and not had to replace it.

Thanks for your input,

Casey

 

[Prairie Dog]

I've been getting a code P0336 too ~ Thinking about swapping the sensor with the Cam position sensor (same part) to narrow down the problem.

 

[AH64ID]

It could be a LP issue, but generally that issue is caused by failing injector(s).

 

[retirednak]

Let me know what happens when you swap sensors. Have you been experiencing cold start issues or just long crank times?



I hope I don't have failing injectors since I don't have the money at this time. Matter of fact I was on Dynamite Diesels site checking on injector prices. Hard to believe new injectors have gone up so much over the last couple yrs.

 

[TCDiesel]

It could be a LP issue, but generally that issue is caused by failing injector(s).

X2... The CK/Cam sensors should NOT effect strating... Both would have to be defective, When Straiting the the ECM will use both.

 

[Prairie Dog]

Let me know what happens when you swap sensors. Have you been experiencing cold start issues or just long crank times?



I hope I don't have failing injectors since I don't have the money at this time. Matter of fact I was on Dynamite Diesels site checking on injector prices. Hard to believe new injectors have gone up so much over the last couple yrs.

Nope, starts great but keeps throwing the code. I cleared it, started it the next day and the CEL came on with 0336 again.

Weather here sucks so it may be a few days before I can swap sensors.

 

[steved]

Poor starting can also be caused by low injection pump pressure... which has a multitude of causes. Point being, it MIGHT not be injectors.

 

[Prairie Dog]

Well, I swapper sensors (cam=PIA) and no code so far. I'll have to drive it a few times to see what happens.

 

[retirednak]

Once it starts warming up,I throw my gauges on and check fuel pressue and see what the LP is putting out. I need to look and see if I might have some corrision growing on the connections for the crank sensors,I may swap the sensors like Prairie Dog did.