P0335 bucking, erratic RPM and stalling

[Msams89]

I got p0335 crankshaft position sensor and p0300 random/multiple cylinder misfire detected codes. I was having idle high at 1100rpm and random bucking. I replaced the CKP with an NTK from RockAuto. Unplugged the negative battery cable for a couple hours. Jeep started and idled along at 700-800Rpm. Went back out to the Jeep to find it had shutoff. Restarted it and took for a spin. The bucking came back and I gained stalling. The check engine is back with only P0335.

Do I hunt for a Mopar KPS or try something else?

‘06 Sport 6 speed with 170,000 miles.

Thanks for any advice!

 

[ItchyDong]

335 or 339?

 

[Msams89]

335 or 339?

My bad. P0335. I’ll edit the post.

 

[JKP]

Check the wiring.

Unplug the crank sensor and run it on the cam sensor only. It will be a long crank to start. If it runs OK, get another crank sensor.

If it's still doing it, the PCM may be going.

 

[Msams89]

Check the wiring.

Unplug the crank sensor and run it on the cam sensor only. It will be a long crank to start. If it runs OK, get another crank sensor.

If it's still doing it, the PCM may be going.

Thanks and I’ll report back once I get a chance to try this.

I did order a mopar sensor which will hopefully be here by the weekend.

 

[JKP]

You can also run it on just the crank sensor, to verify a bad cam sensor isn't screwing with things.

 

[Msams89]

You can also run it on just the crank sensor, to verify a bad cam sensor isn't screwing with things.

Very long crank but started with the CKP unplugged.

The Mopar one arrives on Monday.

 

[Msams89]

Closing the loop here. New Mopar sensor did the trick. The 4 liter runs great, again. All is now well with the old girl.

 

[Marklar1983]

Thanks for the follow up report. I’m having the exact same symptoms, I’ll try without the sensor and order the Mopar replacement

Update: Long start with good idle when the sensor is unplugged. I’ll order the Mopar and post result here.

 

[Marklar1983]

@Msams89 what sensor p/n did you buy, and where did you find it?

 

[Msams89]

@Msams89 what sensor p/n did you buy, and where did you find it?

I bought on eBay. Got robbed at $69.95 but it was new and unopened.

Mopar 04727451AA

I think there might be a few different model numbers that are interchangeable by I can’t be certain on that.

 

[hear]

Unplug the crank sensor and run it on the cam sensor only. It will be a long crank to start. If it runs OK, get another crank sensor.

You can also run it on just the crank sensor, to verify a bad cam sensor isn't screwing with things.

I've been on this forum a hot minute, and I've never heard of this trick before. How long a crank are we talking about?

 

[Marklar1983]

I've been on this forum a hot minute, and I've never heard of this trick before. How long a crank are we talking about?

Around 5 seconds.