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Old 10-08-2010, 09:08 AM
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Check Engine Code

Hey Folks,

I have a 2005 TJ 4.0 and was driving to work this morning and the check engine light came on and the jeep starting bucking and jerking badly upon acceleration. I limped the managed to turn around and head home to check the code. It is P0335 which from what I gather is a crankshaft position sensor. Does this sound about right to you all? I ordered one from advanced to pick up later, however I am not sure where exactly it is on the motor. I have narrowed it down to 2 but could use your help in locating it exactly. Hopefully this will fix the problem. As a side not I started noticing symptoms about 2 weeks ago after filling up the tank with gas. The next morning when I started it, it would stall and did this about 5 times and then it ran fine. I thought maybe I put some bad gas in it and for the most part after adding some Heet and a new tank of gas things have seemed fine until this morning. Does it sound like the crankshaft position sensor is to blame?

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Old 10-08-2010, 09:15 AM   #2

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Basically if the PCM cannot read the position the crank shaft is in it will not be able to fire the spark plugs correctly, giving you the lurching/bucking and rough idle.

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Old 10-09-2010, 04:12 PM   #3
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I have had the same problem for a few weeks now. I have just changed the PCV and added 1 quart of oil. I have live wire kit with .065 gap, hypertech. It is not the gas. I use to have these symptoms befopre I even installed the Borla exhaust and any other performance addon. but the shop keeps upgrading the ffirmware and that is it. One day I drove into a big puddle of water on the streets and let go the gas. Well it gave me the same symptoms but the next day it was ok. I am about to change the sensor too. but there are a couple tests that can be run to determine if the sensor is pooched but I dont know them.

Anybody else with the fix?
Is the PCV supposed to have oil going through it?
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