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Unread 07-12-2014, 06:37 AM   #16
ravensfan1976
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Quote:
Originally Posted by Duh View Post
My tj had wires and a distributor, but didnt the newer 4.0 switch to coil packs? I could be wrong on my memory. I dont know on his specific year.
I have an '02 and it's a coil rail. I replaced that already since I kept getting the same three codes 0300, 0303, and 0304 every time. Once I replaced that the codes stopped for a couple weeks and came back.

I noticed some broken zip ties on the harness I moved away from the block so I really need to do an extensive inspection on the wiring. So far it's looking like I at least stopped the 0420 and the specific 3 & 4 cylinder codes. I'll run it for a few days and see what comes up and inspect the harnesses as I go to see if there's any other indications.

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Unread 07-12-2014, 07:54 AM   #17
asatxj
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Go to wjjeeps.com and do some reading about how/when codes pop up. that will help you understand how that works, your issues aren't temporarily going away, it's how the system recognizes them. Plenty of important knowledge there for those of us who don't like paying for stuff we can do.
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Unread 07-21-2014, 10:09 AM   #18
ravensfan1976
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So I went ahead and had my local Jeep dealership do a diagnostic test on it and apparently it needs a Crankshaft Position Sensor and a Transfer Case Control Switch. Naturally for parts and labor they wanted over $700, but I'm going to take this one on myself. From what I'm reading the CPS is a bit of a pain.
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Unread 07-21-2014, 10:50 AM   #19
WXman
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The CPS isn't a cake walk. But it's not impossible either. Did mine a couple months ago from under the Jeep by using extensions and swivels. You can put your fingers on it from under the hood and feel it...but there is a bracket in the way that makes it hard to get the socket onto the bolt. So going up from under the Jeep is easiest. Took about 30 minutes or so on mine.
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Unread 07-21-2014, 10:55 AM   #20
ravensfan1976
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Quote:
Originally Posted by WXman View Post
The CPS isn't a cake walk. But it's not impossible either. Did mine a couple months ago from under the Jeep by using extensions and swivels. You can put your fingers on it from under the hood and feel it...but there is a bracket in the way that makes it hard to get the socket onto the bolt. So going up from under the Jeep is easiest. Took about 30 minutes or so on mine.

Thanks for the heads up. Is the sensor something easy to spot from underneath or would it be easier to have an extra person on hand as guide if I have feel blindly for it since I'll need to use extensions and swivels to get to it?
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Unread 07-22-2014, 08:29 AM   #21
ChrisHager
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Here are my thoughts on the Crankshaft Position Sensor: 2004 4.0 Crankshaft Position Sensor Replacement
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Unread 08-14-2014, 04:24 PM   #22
ravensfan1976
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Got both parts changed out. The Transfer Case Switch I was able to do myself. The Crankshaft position sensor was just too much of a pain no matter which way I tried. So I broke down and paid Merchant's $85 to do it lol.

Been a few days and other than some rough idling it's been running pretty well. No misfires as of yet *knocks on wood*
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Unread 08-15-2014, 07:58 PM   #23
Acc0919mc
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As for the missfire codes, I was chasing a few of them too. THEN it started hard starting, found out my fuel pump was only putting out around 8PSI. its suppose to be around 55PSI
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Unread 08-30-2014, 10:43 AM   #24
ravensfan1976
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Looks like I didn't knock on wood correctly haha. After two weeks of running well with no codes at all, I'm now getting the infamous P0420 code again. No misfire codes as of yet.

The interesting thing is that I didn't get the P0420 code until one day when I was sitting in traffic with the AC blowing and the engine temp gauge moved up and over 210. It didn't overheat thankfully, but I'm wondering if they're somehow tied together, even though the code came back after resetting, under normal driving conditions, and no high temp reading.
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Unread 08-30-2014, 08:34 PM   #25
HighOutput
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Did you change your 02 sensors?
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Unread 08-30-2014, 09:46 PM   #26
ravensfan1976
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Not yet. I think that will be my next project. I'm hoping it's just that and I don't have to replace the Cat.
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Unread 08-31-2014, 03:37 AM   #27
HighOutput
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^ Buy Denso, oem replacement.
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Unread 08-31-2014, 05:10 AM   #28
86cj74.2L
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Prolonged idle time will allow the CAT to cool off and turn off.

But try your rear down stream sensor. That is the sensor that checks CAT efficiency.
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Unread 10-02-2014, 06:25 PM   #29
ravensfan1976
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Ahhhh the codes never end lol. Now that the misfire codes are gone, the 0420 code disappeared on it's own for a few days, but recently came back with a 0352 and 1281 code.

I'm ready to just set the thing on fire and collect whatever insurance I can haha
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