2000 TJ 4.0 runs rough and rich - Page 3 - JeepForum.com
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post #31 of 42 Old 06-03-2019, 10:02 PM Thread Starter
Greenducky55
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So I ran an injector kill test. On cylinders 1,4&6 the engine idles smoother and higher when killed. These cylinders also have black plugs.
On 2,3&5 when killed the engine stumbles and runs worse.

Though the pressure leak test is fine wouldn’t this still point to an injector issue?

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post #32 of 42 Old 06-06-2019, 10:30 AM
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Everyone has asked, but I don't see an answer to the question. Are there any codes set?

2005 Rubicon Unlimited, 4" Clayton long arm
35" Mickey Thompsons, lots of stuff
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post #33 of 42 Old 06-06-2019, 04:17 PM Thread Starter
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Quote:
Originally Posted by williambmac View Post
Everyone has asked, but I don't see an answer to the question. Are there any codes set?
Continues to have 0 codes. I did some deeper investigation late last night and 1 of my manifold bolts was torqued but was actually cross threaded so it was not sealing correctly. I’m guessing this is the problem. Unfortunately I haven’t had time to work on it until next week. Also sure it’s not an injector leak as it kept fuel pressure for 3 days with the key off.
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post #34 of 42 Old 06-07-2019, 06:46 AM
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very odd. with the way it is running, its not blowing any codes. when did this concern start? were you doing any repairs/mods to the jeep prior to the concern or did it just start out of nowhere?
did you run a noid light on the injector harness? also did you check the injector/coil harness at the back of the valve cover for chafed wiring?
have you tried unbolting the front pipe from the manifold to see if it runs any better? possibly a clogged cat?

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post #35 of 42 Old 06-07-2019, 08:20 AM Thread Starter
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Quote:
Originally Posted by williambmac View Post
very odd. with the way it is running, its not blowing any codes. when did this concern start? were you doing any repairs/mods to the jeep prior to the concern or did it just start out of nowhere?
did you run a noid light on the injector harness? also did you check the injector/coil harness at the back of the valve cover for chafed wiring?
have you tried unbolting the front pipe from the manifold to see if it runs any better? possibly a clogged cat?
I replaced the intake manifold gasket due to the last one having a leak which it ran horrible (original one). After I installed the new gasket it ran great. Took it for a drive ran great about 5 minute in I got a cpk/cmp signal loss code and it stalled. After that it slowly began to run worse. The crank sensor I had was in unknown condition so I replaced it with an OEM unit. I also synced the cam and crank sensor using the scan tool.

I’ve also done a lot of other mods but mostly relating to a tummy tuck. Auto trans took a crap swapped in a manual. (All was working fine new PCM. Correct one. Also know the PCM isn’t the issue as I kept my old one and it also runs the same.)

I’ve replaced/repaired all grounds on the Jeep according to the locations in the FSM (pulled from alldata)

I haven’t ran a light on the fuel harness as using the scan tool I can activate the injectors and watch them pulse individually and all work.

I pretty much suspect it’s the cross threaded bolt and possibly a few others causing a vac/exhaust leak. I don’t plan to change out any other parts or dig into the harness until after I fix that issue.
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post #36 of 42 Old 06-18-2019, 06:22 PM Thread Starter
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Well believe Iíve found the problem. Multiple exhaust leaks kinda of spread out. Used my shop vac on the blow setting taped to the exhaust pipe. And the. Sprayed soapy water at all the joints and anywhere I heard or felt the air escaping. Speaking of which my dynomax cat back had quite a few Iím going to have to weld up.

Exhaust manifold to downpipe.
2 pinholes in the bung I had welded in for an wideband O2 sensor.
And then 1 big one right behind the upstream O2 sensor at the flange to the cat.

I wonít be able to work on it until another week or so but hopefully this will be the end of it. Thanks for the help everyone Iíll keep ya updated.


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post #37 of 42 Old 03-31-2020, 04:03 PM Thread Starter
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So finally have an update. Entirely new down pipe. Brand new NTK O2 sensors. Still the problem persists. Cylinder Leak down test done <10%. Only piece of exhaust not replaced is the manifold. When I had it off a few months ago (when this thread started) I had no noticeable cracks. STFT -18% with LTFT -24%. No fuel pressure loss during fuel leak down test. Autolite copper plugs. All sensors are now OEM. Engine reaches operating temp and coolant appears proper color. Pulled the valve cover no crack in the head even under pressure. I’m stumped. If nobody has any further suggestions I’m at the point of trying to find a reputable shop to figure this thing out.
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post #38 of 42 Old 03-31-2020, 05:00 PM
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I say you might try swapping the injectors from 1/4/6 (your rich cylinders) over to 2/3/5 and see if the rich condition moves cylinder location with the injectors or not.

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post #39 of 42 Old 03-31-2020, 05:32 PM Thread Starter
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So injector 4 was ticking loudly I had a spare and replace that one much quieter but no change in performance.

Here is the plug condition currently these have 1 full warm up cycle on them. In order 6/5/4/3/2/1 left to right.

Prior to this set I pulled a set that 2/3/5 had heavy black as well.
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post #40 of 42 Old 03-31-2020, 06:57 PM Thread Starter
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So swapped injectors 1 with 2, 3 with 4, and 5 with 6 no change in which cylinder is having we plugs. Also with a injector kill test both cylinders 4&6 have a raised idle by about 200 rpm with a smoother idle. All other cylinders have a drop of about 100 rpm and a rougher idle.

As injectors have been swapped with no change. It makes me think there is a wiring issue with these 2 cylinders. I need to pick up a Noid light to check the difference in signal.

Am I thinking correctly?
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post #41 of 42 Old 03-31-2020, 07:10 PM Thread Starter
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Well just ran a test light and both cylinder 4&6 have significantly stronger pulse than the rest. Time to chase some wiring I think. Here is the video. Sometimes the easiest tool is best &#x1f926;&#x200d;&#x2642;&#xfe0f;

https://youtu.be/lHqwPN_O2vA
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post #42 of 42 Old 04-04-2020, 03:07 PM Thread Starter
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And it’s fixed!
Repaired the wiring harness and now she purrs like a kitten. Fuel trims are in check as well too. Also when back probed with a test light and injector kill test each cylinder responds the same. &#x1f64f;

Thanks for the help everyone glad it’s repaired and I can get back to driving it soon!
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