post #31 of Old 08-29-2014, 03:51 PM
ChrisHager
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Originally Posted by 2002jeepIN View Post
I have a code the says that the number 6 cilinder is miss firing. Is this a sign of the timing is off
If the timing was off, you'd have multiple cylinders misfiring.


~Chris
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post #32 of Old 08-29-2014, 04:24 PM Thread Starter
2002jeepIN
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What would cause the code on cylinder 6. Also why would it Start hard and idle rough
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post #33 of Old 09-02-2014, 07:24 AM
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Start here: Misfire Diagnosis Guide

~Chris
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post #34 of Old 09-03-2014, 12:06 PM Thread Starter
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Hey ya'll here is what I get after I finally get the engine started. It seems like there is not enough juice to start the jeep but it battery is fully charged. After it starts it idles a little rough and sucks air bad then it quites down a bit. When ecclerate it wants to die until I get the rpms to about 1000 then it seems to be fine as long as it stays above a 1000 rpms. I also get about 6 codes. I have attached a screen shot of them. Let me know what you all think.
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post #35 of Old 09-03-2014, 12:39 PM Thread Starter
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So since it it wont let me upload my screen shot. Here are the codes: PO352, PO351, PO389, PO354, PO356, and PO141. Let me know what ya'll think
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post #36 of Old 09-03-2014, 12:44 PM
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P0141 (M)
O2 Sensor Heater Circuit (Bank 1 Sensor 2)
Oxygen sensor heater element malfunction. O2 sensor voltage greater than 3 volts for 60 to 240 seconds.

P0351 (M)
Ignition Coil A Primary/Secondary Circuit
Peak primary circuit current not achieved with maximum dwell time.

P0352 (M)
Ignition Coil B Primary/Secondary Circuit
Peak primary circuit current not achieved with maximum dwell time.

P0354 (M)
Ignition Coil D Primary/Secondary Circuit
Peak primary circuit current not achieved with maximum dwell time (High Impedance).

P0356 (M)
Ignition Coil F Primary/Secondary Circuit
Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0389
Crankshaft Position Sensor B Circuit Intermittent


I would start by focusing on P0389 (read: bad Crankshaft Position Sensor OR faulty wiring to said sensor). The Crankshaft Position Sensor directly affects many other systems in a vehicle.


~Chris
His: 2004 WJ - OME HD 'Kolak' Lift - Build Thread
His: 1979 J-10 - 3" on 33s - Build Thread
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post #37 of Old 09-03-2014, 01:00 PM Thread Starter
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If you timimg was off would it effect your crankshaft sensor
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post #38 of Old 09-03-2014, 01:01 PM
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It shouldn't. The crankshaft position sensor basically reads the location of the crankshaft and sends the information back to the computer. As important as this sensor is, ironically it's task is very elementary.

~Chris
His: 2004 WJ - OME HD 'Kolak' Lift - Build Thread
His: 1979 J-10 - 3" on 33s - Build Thread
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post #39 of Old 09-03-2014, 01:43 PM Thread Starter
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How would I know that the timing is off. Something is telling me that the time is off
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post #40 of Old 09-03-2014, 01:53 PM
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Have you messed with the Camshaft Position Sensor? If you haven't removed it, the timing should be fine unless the sensor bad. Thought I think the sensor is of no concern, ultimately the decision is yours and you're welcome to replace it if you wish. When you do, you'll need the dealer to set it properly with a DRBIII tool.

I still recommend looking into the Crankshaft Position Sensor since you actually have a code for it. Keep in mind, when this sensor goes out, it can cause weird running issues, random misfiring, and stalling.

~Chris
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His: 1979 J-10 - 3" on 33s - Build Thread
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post #41 of Old 09-03-2014, 02:16 PM Thread Starter
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Your talking about the one one the bottom of the head right?
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post #42 of Old 09-03-2014, 02:27 PM
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Woops! We're discussing a V8.

My advice above still stands EXCEPT for the part about having the dealer sync the Camshaft Position Sensor with a DRBIII tool. That's accurate for a 4.0 but I'm not sure what is needed in regards to a 4.7.

That being said, the Camshaft Position Sensor is located at the front of the passenger side head towards the top. The Crankshaft Position Sensor is located at the rear of the passenger side on the lower portion of the block.

~Chris
His: 2004 WJ - OME HD 'Kolak' Lift - Build Thread
His: 1979 J-10 - 3" on 33s - Build Thread
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Hers: 2000 TJ
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post #43 of Old 09-04-2014, 04:54 AM
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fyi I've been fighting a non start issue similar to many posts, Sometimes starts, others no (no gauges).. I've replaced CKP and CPS with mopar parts.
Camshaft Sensor - Passenger side behind oil filler (4.7) Remove battery and battery tray you can access it easily.
Crankshaft Position Senor - Bottom of engine, above starter. Started can be 'moved' out of the way, you'll see the sensor. Beware they are pita to remove if frozen in, I ended up using a dremel and grinding it out after the post broke off (common according to dealer mechanic)

I've also replaced fuel pump and filter
I've replaced fuses and relays.

Today I'm ordering a pcm (still doesn't start, does rarely)
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