2000 TJ 4.0 runs rough and rich - JeepForum.com
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post #1 of 42 Old 05-25-2019, 09:46 PM Thread Starter
Greenducky55
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2000 TJ 4.0 runs rough and rich

I have a 2000 TJ 4.0 Manual with federal emissions (1 cat)
It currently is running super rough with black soot in the exhaust. It smells of fuel really bad and burns my eyes. Sounds like a misfire but throwing 0 codes currently.
Pulled the plugs and cylinders 2,5&6 are black with 2&5 especially smelling like fuel and are black and wet.

Here is what I have done so far.
Checked resistance of coil packs. (Passed per alldata specs)
Replaced both cam and crank sensors with OEM Mopar units. (After having a P1391) prior I had cheap autozone units.
Replaced IAC with cheap unit (mine was seized)
Brand new Remflex intake/exhaust gasket torqued to spec ran and then re-torqued.

Runs rough at idle and at any throttle position. Pulling power to Injectors responds on all cylinders as expected. On cylinders 1,5&6 when pulled it runs extremely rough compared to 2,3,4. (I ran injector cleaner through all injectors with an injectors tester they all sprayed nice streams and pulsed as expected.)

I am at my wits end and hoping you can help.

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post #2 of 42 Old 05-25-2019, 10:53 PM
mukluk
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For a fuel injected engine running rich, the very top of the list of suspects would be a bad upstream o2 sensor.

If you have access to a scanner that can show live data, check your manifold pressure and coolant temp readings with the engine at warm idle, and take a look at the fuel trims.

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post #3 of 42 Old 05-26-2019, 06:27 AM Thread Starter
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Thank you for the reply. I currently don’t have a scanner. Would you still suspect o2 sensors even though only 3 cylinders run rich and the others plugs look clean?
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post #4 of 42 Old 05-26-2019, 08:03 AM Thread Starter
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I ended up ordering a set of 6 inline spark testers to check if it’s the coil at all. The pairing of 2&5 make me suspect and issue on that end. If that checks out I’m thinking I’ll just bite the bullet and get a scanner. Between the Jeep, my truck, and my wife’s car it will pay for it self fast vs the continued throwing parts at it. Does anyone have a preference of Autel vs Launch?
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post #5 of 42 Old 05-26-2019, 08:19 AM
CJ7-Tim
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Quote:
Originally Posted by mukluk View Post
For a fuel injected engine running rich, the very top of the list of suspects would be a bad upstream o2 sensor.
.
I agree. Test the O2 sensors, or use your OBD code scanner to view live data.

If you buy new O2 sensors only buy NGK/NTK brand sensors. Bosch and generic auto parts store O2 sensors do not work right in Jeeps.

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post #6 of 42 Old 05-28-2019, 10:10 AM Thread Starter
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So used the park testers and all 6 cylinders had spark some weaker than the others but could be the testers themself still not 100% convinced on the O2 sensors but never the less I ordered a Launch pro mini scanner at the same price of some lower models. Should be here Thursday and hopefully I can run some real diagnostics this weekend and get an answer. I’m just tired of throwing parts at it.
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post #7 of 42 Old 05-31-2019, 08:03 AM Thread Starter
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Well here is the O2 heater Test graphs. Only 1/1 & 1/2 apply. (2/1&2/2 are for Cali emissions which I do not have) 1/1 is upstream 1/2 is downstream. Looks like the upstream sensor is bad. I’ll get a new one and see what it does.
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post #8 of 42 Old 05-31-2019, 06:19 PM Thread Starter
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Welp new O2 sensors behave better in the scanner the Jeep no longer runs rich, but now it backfires and is missing.

Found out using the scanner I had injector 1&2 backwards. Fixed that still runs like crap.

Tested the coil packs with the scanner all have good spark. Threw new plugs in still have a few turning black.

Tested pulling injectors again all of them effect idle though cylinder 1 does not cause as rough of an idle as the others.

Evap purge working
IAC working
Map working
TPS working
To recap brand new MOPAR crank and cam sensor.
Ecu notices no misfires even when I turn the sensitivity all the way up with the scanner.

Out of ideas.
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post #9 of 42 Old 05-31-2019, 06:25 PM
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Try resetting your adaptive memory.

1. Disconnect the POSITIVE battery Terminal and touch it to ground for 30 seconds.
2. Reconnect the Battery Cable
3. Turn Ignition Switch to the "ON" position but DO NOT start the engine
4. Turn Headlight "ON"
5. Turn Headlights "OFF"
6. Turn Ignition Key "OFF"

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post #10 of 42 Old 05-31-2019, 06:41 PM Thread Starter
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I had reset it with the Scanner but went ahead and proceeded with the way you suggested. Still no improvement.
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post #11 of 42 Old 05-31-2019, 06:46 PM
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post the updated o2 sensor B1S1 graph.

Were there any codes ?

With scanner what is ECT ?

Will jeep start right up or do you need to 'prime' fuel pump?
>> thinking here is could an inj be leaking.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #12 of 42 Old 05-31-2019, 06:52 PM
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FYI: Mukluk's suggestion was different than a clear code.

perform reset as he suggested.

oops I just saw you already reset.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #13 of 42 Old 05-31-2019, 07:05 PM Thread Starter
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Using a Launch X431 pro mini

post the updated o2 sensor B1S1 graph.
Heres the O2 heater test. And the. I’ve uploaded some with it running. Along with a video to hear the roughness.
Were there any codes ?
No codes after replacement of sensors. (Other than those I caused by pulling injector plugs)
With scanner what is ECT ?

Will jeep start right up or do you need to 'prime' fuel pump? >> thinking here is could an inj be leaking.
Fires right up I’d say.
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post #14 of 42 Old 05-31-2019, 07:06 PM Thread Starter
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post #15 of 42 Old 05-31-2019, 07:13 PM Thread Starter
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