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Old 01-15-2014, 04:44 PM   #1
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P0202 and jerk only at 2000 rpm

Hello! I've used this forum before to solve plenty of issues and just wanted to start of by saying thanks for all the posts people have made! It's always helped me out
That being said this is the first time I have had to post anything so forgive me for not being to clear if something doesn't come across correctly

I have a 2002 4.0 manual TJ and am getting a p0202 injector circuit not responding or something along those lines and on top of that whenever I am on a long enough drive ~15 minutes my jeep jerks right at 2k rpm never more never less
Recently I've replaced my full set of injectors as well as plugs however the problem was present before changing the injectors any help would be greatly appreciated thanks!

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Old 01-15-2014, 07:51 PM   #2
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Do you have distributor or coil?

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Old 01-15-2014, 08:11 PM   #3
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Coil
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Old 01-15-2014, 08:16 PM   #4
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If it helps any, the jerk only happens once right when I hit 2k in 3rd and higher
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Old 01-15-2014, 08:23 PM   #5
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Check to make sure coil is fully engaded with spark plugs
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Old 01-15-2014, 08:29 PM   #6
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I'll make sure to double check that when I have a little daylight. Would that cause a problem that specific though?
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Old 01-15-2014, 08:54 PM   #7
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I had the P0202 code on my 05. The code is saying there is an interruption in the wiring going to the number two injector. Mine turned out to be just that. My wiring harness on the fire wall was resting on the AC condenser and over time the two rubbing had worn through the plastic shielding. It wore one of the wires going to the #2 injector in two. You could not easily see it and I only found it because I was looking for a wiring issue. I would recommend checking all the wiring harness legs very closely for signs of damage or abrasive wear. If that doesn't do it check your connections next. Wiring issues are the worst.
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Old 01-15-2014, 09:09 PM   #8
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When I first saw the code I checked the voltage before the connector with a probe and it was okay, but it doesn't hurt to check it again do you know of any way to check the connector itself?
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Old 01-16-2014, 08:32 AM   #9
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First I would check the end away from the injector. Mine ran into 4 plugs mounted on the firewall behind the battery. Yours may be different, but I had to really clean the plugs due to oxidation.

If all of that looks good, I would clear the code and then I ( and let me stress I) would cut the wires going to the #2 and another one and swap them. If the code changes, you know you have a bad connector at the injector.

I'm not an electrician so maybe someone with more knowledge can provide better guidance.

Sorry I don't have a better pic but this shows two of the plugs that go to the connectors on the firewall.
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Old 01-16-2014, 01:14 PM   #10
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That sounds like what I'm going to have to do since I can't find a way to directly test the connector. I won't be able to do it until this weekend though because I just started class again, I'll post as soon as I do though
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Old 01-16-2014, 08:59 PM   #11
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Fingers crossed and positive thoughts....hope you find it!
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Old 02-07-2014, 11:30 PM   #12
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Sorry I took so long to get back I just got caught up with school, so while testing injector wires I decided to give my throttle body sensors a once over then moved on to my o2 sensors only to find that my upstream bank one was always completely unresponsive at the connector. Swapped out both upstream sensors with NGK replacements just for posterity and everything is fine, two hour round trips to school everyday for a week now and haven had an issue. I guess the PCM didn't begin taking readings from the sensors until over 2000? Bottom line is everything is good and I really just got lucky and happened to check the right thing
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Old 02-07-2014, 11:41 PM   #13
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It takes readings once up to temp. If you are talking about codes like clearing a light unhook the battery a few minutes. Don't know if you have anything being a light or whatnot. The 2000
Thing confused me like maybe your waiting for one to go out.
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Old 02-09-2014, 01:44 AM   #14
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Yea the 2000 rpm thing kinda threw me off of it at first too thats why I didn't even think of checking the 02 sensors and I have a reader and all that good stuff so everything is cleared and buttoned up. Just passed smog yesterday with flying colors and everything seems to be good now. Just feel a little stupid having replaced a full set of injectors just to find out it was those sensors hahahaha
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Old 02-09-2014, 01:44 AM   #15
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Ohh well I guess 200,000 miles is a good time to change them anyway hah

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