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Old June 9th, 2013, 07:53 PM   #1
Badmunky
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Default Did a tune up. Found this.

Ok so I had some free time so I did a tune up on my 98 ZJ.

It was having a problem with bogging shortly after being started and not running smooth. Also seemed to be down on power.

So I removed the spark plugs and found this.


What is wrong with people?

It runs great now! Has a lot more power and seams to be getting better MPG as well. (Was getting 13.4 now getting 19.2) Doing mostly city and rural driving.

But there is one thing that it still will not do.
It still will not spin the tires off the line. It seams to have low power under 1,300 RPM.
My cousin has a 91 Cherokee with a 4.0 and he can spin his tires for a good 50 feet from a dead stop.
I cant even get it to turn the tire over at all. Is there still something wrong or is it just that I have ZJ and he has an XJ?

Last edited by Badmunky; June 12th, 2013 at 06:52 PM.
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Old June 9th, 2013, 07:54 PM   #2
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Id check the seams
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Old June 9th, 2013, 07:57 PM   #3
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3,4 and 5 look like they are burning hot. Have the injectors cleaned, might make a difference.

opps, I over looked the seams.
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Old June 9th, 2013, 09:18 PM   #4
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Id check the seams
Voice recognition software sucks some times.

Posted it from my phone and it dose that crap to me all the time.
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Old June 9th, 2013, 09:25 PM   #5
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3,4 and 5 look like they are burning hot. Have the injectors cleaned, might make a difference.

opps, I over looked the seams.
Yeah they all look a little hot to me.

I plan to replace the injectors with the 4 hole 704s from the Neon next month.

Just need to find a good rebuilt set at a good price.

I should also let you guys know that my exhaust manifold is cracked, and I think the PO gutted the cat.

I don't have a CEL. And I thought I would get one if the cat was gutted?
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Old June 9th, 2013, 09:44 PM   #6
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What gear ratio do you have in the axles and what size tires, compared to your cousin?
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Old June 9th, 2013, 10:12 PM   #7
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Xj = shitload lighter then zj .
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Old June 10th, 2013, 06:45 AM   #8
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ZJ has the Chrysler 4 speed, XJ has the Aisin. I always felt the Chrysler 4-speed with the I6 seemed mushy and slow compared to the XJ.

And the weight probably isn't helping either.
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Old June 10th, 2013, 08:53 AM   #9
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Fix your exaust leak and it will run better, If the exaust leak is in front of the 02 sensor.

Are the two longer plugs a hotter heat range also? Maybe the po had a problem with a few cylinders and put a hotter plug in before he sold it.
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Old June 10th, 2013, 02:50 PM   #10
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Quote:
Originally Posted by af26yrs View Post
What gear ratio do you have in the axles and what size tires, compared to your cousin?
We are both stock. Gearing and tires.

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Originally Posted by jaysusr View Post
Xj = shitload lighter then zj .
True. The rear suspension is vary different as well.

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ZJ has the Chrysler 4 speed, XJ has the Aisin. I always felt the Chrysler 4-speed with the I6 seemed mushy and slow compared to the XJ.

And the weight probably isn't helping either.
That could be it. It seams to to have less power under 2k the his dose for sure.
Can I change to the Asisn AW4 trans with out any problems or is the computer system going to be a pain the you know what?

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Fix your exaust leak and it will run better, If the exaust leak is in front of the 02 sensor.

Are the two longer plugs a hotter heat range also? Maybe the po had a problem with a few cylinders and put a hotter plug in before he sold it.
It is in front of the up stream O2 sensor. And I plan to fix it as soon as I can. But I'm low on cash right now.
There all the same heat range.
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Old June 10th, 2013, 07:54 PM   #11
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Okay I don't understand this at all.
Now its back to running like crap and no power.
I just went to go pick the wife up and about 300 yards from the house it hesitated and lost power. I gave it more gas and it back fired threw the intake and tried to die.

I let off the gas totally and then it recovered and started to run fine. But its back to being down on power again.

Seams to run good. Idles good. Starts right up. No bad sounds when its running good.
But it lost like 25% of its power for no reason.

From a dead stop it will only spin its tires on a dirt road for about 3 feet!!!!
That's crap!

I don't want to just throw money at it trying to fix the problem ether. It dos NOT have a CEL. And has yet throw any codes as long as we have had it.

We have now run a full tank of gas threw it plus some. And still no CEL.
How can it run like this with no codes? Fuel mileage is dropping again.

Thanks guys.
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Old June 10th, 2013, 08:18 PM   #12
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what tcase is in it? is it full time 4wd?

the 42rle robs alot of power compared to an aw4.

2 extended tips, and 4 regulars is kinda funny though!
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Old June 10th, 2013, 08:35 PM   #13
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Have you hooked it up to a scan tool to check for codes? The CEL light might be knocked out. I can't image it running that poorly and not throwing a code.
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Old June 10th, 2013, 10:31 PM   #14
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what tcase is in it? is it full time 4wd?

the 42rle robs alot of power compared to an aw4.

2 extended tips, and 4 regulars is kinda funny though!
It has the NP242. Its in 2wd right now.

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Have you hooked it up to a scan tool to check for codes? The CEL light might be knocked out. I can't image it running that poorly and not throwing a code.
CEL light comes on when you turn the key then gos off as it should. So I know its working.
Had it scanned and it has no stored codes, no active codes.

It runs smooth after its been running for a few and you get past the hesitation it has a few min after a cold start.

I have never had any thing as good as this thing and yet have no power and no other problems that I can find.
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Old June 11th, 2013, 08:49 AM   #15
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Dont think for one minute it's not a problem just because it wont throw a cel. I had 3 almost flat cam lobes in my stroker last summer. It ran perfectly under 4000 rpm and ran like shit over 4000 rpm. Never once threw a code in the 1000 miles it took to find my problem.

I still think the missmatched plugs were in there for a reason. I would do a compression test to start with.
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Old June 11th, 2013, 09:02 AM   #16
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Didn't the 4.0 have an issue with the distributor bushings wearing out and causing the shaft to move around affecting the timing? At idle there would be less force against the drive gear than there would be when you are accelerating so it may run fine at idle but get out of whack under load.
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Old June 11th, 2013, 11:12 AM   #17
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wow, weird same here, except mine has the 249 tcase. Funny thing is my 96 ZJ 4.0 is running like shit too with a lack of power(I drive v8's tho), and doing the same hesitation for a few seconds when you first drive off, same as you describe. Ive done everything from a new plugs, cap, rotor, coil to a new fuel pump/regulator/filter. Also changed my O2 sensors. Still I think im missing something, maybe just 2 more cylinders.
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Old June 11th, 2013, 11:31 AM   #18
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Read this, may help ya.

http://www.wranglerforum.com/f8/symp...sor-27477.html
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Old June 12th, 2013, 02:05 PM   #19
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that helped me at least. Ordered a new throttle position sensor today and picking it up after work, its worth a shot at least. Also been reading a lot on just taking your throttle body off for a serious cleaning so Im also going to do that and see what happens.
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Old June 12th, 2013, 02:15 PM   #20
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Dont think for one minute it's not a problem just because it wont throw a cel. I had 3 almost flat cam lobes in my stroker last summer. It ran perfectly under 4000 rpm and ran like shit over 4000 rpm. Never once threw a code in the 1000 miles it took to find my problem.

I still think the missmatched plugs were in there for a reason. I would do a compression test to start with.
I will be doing a compression test as soon as I get home again.

Quote:
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Didn't the 4.0 have an issue with the distributor bushings wearing out and causing the shaft to move around affecting the timing? At idle there would be less force against the drive gear than there would be when you are accelerating so it may run fine at idle but get out of whack under load.
The distributor looks to be newer. But I will pull it out and check it to be sure.

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wow, weird same here, except mine has the 249 tcase. Funny thing is my 96 ZJ 4.0 is running like shit too with a lack of power(I drive v8's tho), and doing the same hesitation for a few seconds when you first drive off, same as you describe. Ive done everything from a new plugs, cap, rotor, coil to a new fuel pump/regulator/filter. Also changed my O2 sensors. Still I think im missing something, maybe just 2 more cylinders.
I'm not 100% that I have the 242. It may have a 249 in it. Not sure how to tell. I was told it has the 242 but I don't know if they guy new what he was talking about or not. I know it has one or the other.

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That did help. Ill be ordering a new TPS as well.


Right now the ZJ is totally stock. Tires, wheels, every thing. For now any way.

My plan at this point is this:
Replace cracked header with new one. (Not sure what to buy yet, little help here?)
Replace injectors with 703 Neon injectors. (Knew about this and was planing it already.)
Replace up stream O2 sensor. (Current one looks to be stock. Jeep has 152k on it)
Replace failing fan clutch and fan with electric fan from 99 GC, and a fan controller.
Replace drive belt.
Replace TPS.
Do a compression test.
Test fuel pressure.
Check for vacuum leaks.
Change oil and filter.
Service transmission.
Change oil in both diffs and replace leaking cover seals.
Change oil in T-case.
Replace leaking rear wheel seals and install new wheel bearings while I'm in there.
Replace leaking real main seal.
Replace leaking valve cover gasket.
Replace leaking oil pan gasket.
Replace leaking oil filter adapter seal.
Attempt to force the ECU to throw a CEL by unhooking engine temp sensor to be sure that the CEL circuit in the ECU is working. (Have been told Jeeps have a problem with this, and not throwing a CEL or code even when there is a problem.)

And I will look at relocating the AIT sensor as well. Why do people do this?
Where is it now? And will this work okay in extreme cold such as ND in January? Extreme hot such as NV desert in August? I ask because I may move at the end of the year, but I don't yet know where I will be going.


I understand that this thing is not going to do 0-60 in under 6 seconds. LOL
But stock it was rated to do 0-60 in just about 11 seconds. I would be happy with that. Right now I'm closer to 17 seconds, give or take a second.
And passing is just out of the question.

I will admit I am used to driving a much faster car then this is. But I have owned slower cars before. And its not a problem. As long as they run right.

My current DD is a highly moded WRX pushing about 460hp at the crank.
I don't expect the Jeep will ever keep up with it. LOL
But I do expect I can at least keep up with my sister driving a fully loaded Dodge Mini van pulling a trailer!

Yeah she smoked me, her and 4 kids, 2 big dogs, and bunch stuff for my brothers baby shower, PULLING A 1,400lb TRAILER!!!!!!!!!!!!!!!!!!!!!!

She drives like that mini van is a sports car. I was trying to follow her and had to call her and tell her to slow down or she was going to lose me. I could not keep with her in the city, or on the high way. (She was doing like 90mph on the high way with the trailer!!!! Yeah shes nuts!


If what I have planed dos not fix my problem where should go from there?

I have herd that there is a TSB for the ECU not throwing codes. Is this true?

And is there any thing I left off my list that I should just do?


Thanks for the help guys!
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