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Old 04-14-2013, 07:42 PM   #1
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Just got my first jeep.

98 4.0l 5 speed soft top half doors. It's mostly stock. A few dents and minor rust. Check engine light is on. The guy at Auto Zone said it was the O2 sensor after the catalytic converter and a cylinder misfire.

It idles and drives fine. Can the misfire be from stalling when shifting into first? Haven't driven a stick in 10 years. The first few days were rough.

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Old 04-14-2013, 08:22 PM   #2
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Welcome and congrats! I just purchased my second TJ over the weekend. They are quite addicting.

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Old 04-14-2013, 09:21 PM   #3
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What were the actual codes? Depending on the codes it could be the o2 or the cat since the rear o2's only monitor cat efficiency. Same goes for the miss code...there's codes for each cylinder and a code for random miss.
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Old 04-14-2013, 09:28 PM   #4
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Crongrats on the acquisition, from a fellow recent 1st time Jeep owner. I had the same issue with the check engine light (4cyl though), the guy at Auto Zone gave me the same diagnosis, after a couple tanks of BP gas the light went out and hasn't come back on.
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Old 04-14-2013, 09:41 PM   #5
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I don't know the actual codes. I'll go back and find out.

For the surface rust is it better to sand and primer / paint or por15 and paint?
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Old 04-15-2013, 01:29 PM   #6
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Here is some of the rust I was talking about.
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Old 04-19-2013, 03:39 PM   #7
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I had a chance to go get the codes checked again. They are

P0320 No Crank Reference Signal at PCM No reference signal (crankshaft position sensor) detected during engine cranking.

P0139 O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

Do these tend to be straight forward issues?
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Old 04-19-2013, 03:54 PM   #8
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If you end up changing the o2 sensor, make sure to use NGK(NTK) as they are OEM for jeep Tj's. I changed all of mine in January of this year. Just one of the many things that tend to wear out after time.
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Old 04-19-2013, 04:02 PM   #9
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If you end up changing the o2 sensor, make sure to use NGK(NTK) as they are OEM for jeep Tj's. I changed all of mine in January of this year. Just one of the many things that tend to wear out after time.
And get them from Rock Auto at half the cost.
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Old 04-19-2013, 04:17 PM   #10
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And get them from Rock Auto at half the cost.
Yep, thats where I got mine, also used the discount code which saved abit but shipping to me cost 40$ so it kinda balanced out the price. Prolly cost different if I lived in the US or closer the California :/
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Old 04-19-2013, 04:28 PM   #11
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Here is some of the rust I was talking about.
Is it bed lined?
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Old 04-19-2013, 04:56 PM   #12
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Not bed lined.


Does someone have a link to Rock Auto. Google is showing me a used car lot in Detroit.

Edit. I think I found it. http://www.rockauto.com/index.php

Is that the place?
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Old 04-19-2013, 05:00 PM   #13
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Not bed lined.


Does someone have a link to Rock Auto. Google is showing me a used car lot in Detroit.

Edit. I think I found it. RockAuto Parts Catalog

Is that the place?
Yes, but in the section when ordering "How Did You Hear About Us?" box at the bottom to save a few bucks. PS this code "1360735011135302" is good till May 5th, 2013 as they send them out to those who order more then once...
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Old 04-19-2013, 05:20 PM   #14
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get a can of throttle body spray cleaner. spray down into ypur throttle body while running engine. clean it good . unhook your battery cable let it sit for a few minutes not running. turn off everything ,radio fan air what ever you have. start it back up dont touch gas or anything . let it run a few minute for the computer to reset everything and see if it runs better and the codes go away. run a tank of high test and you should be ok.
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Old 04-20-2013, 02:09 PM   #15
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get a can of throttle body spray cleaner. spray down into ypur throttle body while running engine. clean it good . unhook your battery cable let it sit for a few minutes not running. turn off everything ,radio fan air what ever you have. start it back up dont touch gas or anything . let it run a few minute for the computer to reset everything and see if it runs better and the codes go away. run a tank of high test and you should be ok.
I'm assuming this is only for the O2 high voltage code and not for the crankshaft position sensor?
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Old 04-20-2013, 03:15 PM   #16
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I had a chance to go get the codes checked again. They are

P0320 No Crank Reference Signal at PCM No reference signal (crankshaft position sensor) detected during engine cranking.

P0139 O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

Do these tend to be straight forward issues?
Put in a new crank sensor. They're not that expensive but make sure you also get the paper spacer that you stick onto the sensors tip....it's sold separately for some reason. My 05's sensor is on the passenger side bellhousing but I think the earlier years are on the drivers side.

That o2 code could be an exhaust leak or the sensor itself. I'd check for leaks first since that's free and then replace the sensor. Use conductive anti-seize on the threads because o2's ground out through the exhaust.
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Old 04-20-2013, 03:18 PM   #17
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Welcome! Premo
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Old 04-20-2013, 04:34 PM   #18
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Welcome! Premo
Thanks!
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Old 04-20-2013, 10:26 PM   #19
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Put in a new crank sensor. They're not that expensive but make sure you also get the paper spacer that you stick onto the sensors tip....it's sold separately for some reason. My 05's sensor is on the passenger side bellhousing but I think the earlier years are on the drivers side.

That o2 code could be an exhaust leak or the sensor itself. I'd check for leaks first since that's free and then replace the sensor. Use conductive anti-seize on the threads because o2's ground out through the exhaust.
I picked up the crankshaft position sensor this evening. I couldn't find a paper spacer online and the guys in the store had no idea what I was talking about.

Are you sure it's necessary on 98 4.0l manual 5 speed?

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