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  #1  
Old September 25th, 2017, 17:59
vertrx vertrx is offline
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Where would I start??

2001 XJ, motor recently replaced about 9 months ago with a used motor from another 2001 Had about 140,000 on it.

That said, running fine, but now have issues. Its giving codes 0300, 0304,0306, running real rough and interestingly there's white smoke coming out the tailpipe! That may be a red herring though as the coolant is fine, oil has no coolant in it, but I think the motor has that head with the issues.

I've changed plugs with NGK's, and fuel injectors. Cooling system new parts. But the catalytic converters are original, not replaced, so where do i start?

Could it be the catalytic converter? Vacuum leak? Coils? The weird thing is the white smoke since I don't see that come up in a search on those codes...
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  #2  
Old September 25th, 2017, 18:26
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Tim_MN Tim_MN is offline
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Re: Where would I start??

The codes are there for a reason, troubleshoot based on the codes. If the cats are original, it is likely the O2 sensors are also original, and require replacement. Test the O2 sensors. Test the fuel injectors, and inspect the injector wire harness for damage and failed wire splices. Test the other OBD sensors.

During an engine swap, the wire harnesses get jerked around pretty good, make sure there are no failed wire splices, melted/chafed wire insulation, and that all of the ground points are clean and properly snug.
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  #3  
Old September 25th, 2017, 18:34
RCP Phx RCP Phx is offline
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Re: Where would I start??

https://www.quadratec.com/jeep_knowl...article-39.htm
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  #4  
Old September 25th, 2017, 18:40
vertrx vertrx is offline
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Re: Where would I start??

Will do. I think I'll check the coil first. I think that cylinders 3 and 6 are on the same coil?
Also, I saw a you tube video where a guy tested the injectors. He used a set of tools in a plastic box and attached one of the pieces to the fuel injector? It looked like the plastic ball or tool he used started flashing like an LED inside. What would that tool be called?

That said, why the white smoke?
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  #5  
Old September 25th, 2017, 19:17
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Alaskan89XJ Alaskan89XJ is offline
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Re: Where would I start??

http://www.naxja.org/forum/showthread.php?t=1076299

I would consider a failed head gasket, cracked head, or cracked block.

If the replacement engine was mostly intact when dropped into your vehicle, then all of the above is suspect, but the gasket might be the first place to look into. White vapor out of the tailpipe continuous? Just for a moment, or two after start up? Lots, or little?

From what I remember the years of your head are prone to cracking after an overheating engine condition. The better made head is called a TUPY, (click on above link).

Unless you have all the tools, and diagnostic ones, UV dye/black light as well, check into it. However, if not, then discuss with most shops that do, and see what they can check for you. Probably an hour's worth of labor costs to determine the condition. Go from there.

I have no way to check codes on a RENIX XJ, so am not familiar with that.., but others here do, and will advise you on those code issues you have.

Best wishes.
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  #6  
Old September 25th, 2017, 19:28
vertrx vertrx is offline
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Re: Where would I start??

Thank you. Its not a Renix, so I think that eliminates one issue. I am worried about the head issue and all its problems since that is why the first motor went south...actually west as it ended its journey in the middle of the winter in Nebraska. Towed it home! And yes, that is the head cracking year.

I was thinking to follow the codes as the first response was saying since those seem to indicate cylinder firing issues.

That white smoke is continuous though, so troubling while the engine is running rough.

Also, that fuel injector tester is called a noid or something. Interesting concept.
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  #7  
Old September 25th, 2017, 21:25
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Runnin'OnEmpty Runnin'OnEmpty is offline
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Re: Where would I start??

The P0300 code is a random misfire, the P0304 is
cylinder #4 misfire, and P0306 is cyl. #6 misfire.

I'd take a look at the plugs on number 4 and 6 cylinders,
and see if bubbles show up in the radiator when idleing.

Unfortunately it sounds like a cracked head....
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Old September 26th, 2017, 04:54
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Re: Where would I start??

If you suspect head issues, confirm by testing. The 2000-01 0331 head is prone to cracking, but not all 0331 heads will crack. A compression test, cylinder leak down test, a combustion byproduct test kit for the coolant, and an oil sample sent to Blackstone Labs will tell you exactly what you need to know.
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  #9  
Old September 26th, 2017, 08:29
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ehall ehall is offline
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Re: Where would I start??

Quote:
Originally Posted by vertrx View Post
Will do. I think I'll check the coil first. I think that cylinders 3 and 6 are on the same coil?
Also, I saw a you tube video where a guy tested the injectors. He used a set of tools in a plastic box and attached one of the pieces to the fuel injector? It looked like the plastic ball or tool he used started flashing like an LED inside. What would that tool be called?
They are called "noid lights", basically they are just lights that connect to the injector wire--when the computer sends an injector pulse, the light takes some of the voltage
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  #10  
Old September 26th, 2017, 18:38
trippled trippled is offline
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Re: Where would I start??

Quick test would be pressurize cooling system, let it set for a few minutes, pull the plugs and crank it. Look for coolant coming out. Not always a perfect end all test but if it's that bad it's a quick check that works.
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  #11  
Old September 26th, 2017, 19:55
vertrx vertrx is offline
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Re: Where would I start??

Ok, so it sounds like it might be a cracked head subject to some further testing. I'll check the plugs if they show any moisture.

I'll check radiator to see if it has bubbles in it? Will they show up before or after thermostat opens...hot or cold?

And I'll try pressurizing the cooling system. I suppose I pressurize it with the pressure equipment in place while I crank the engine? With spark plugs out?

If none of that is determinative, I'll have to go the expensive route that Tim_MN suggested. That will get expensive, so leave that for last. Besides, I'd have to trailer the Jeep to the shop!!

Thank you ehall for the noid light explanation!!
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  #12  
Old September 26th, 2017, 20:18
vertrx vertrx is offline
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Re: Where would I start??

Carrying the matter forward, say I need a new cylinder head due to a crack, do I buy a rebuilt 0331 which it seems to me would have the same cracking issue or would I look for the TUPY(?) if it fits? A rebuilt one or one out of the junkyard?
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  #13  
Old September 26th, 2017, 20:29
Heavyopp Heavyopp is offline
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Re: Where would I start??

A smart man would rebuild any head coming from the junk yard...
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  #14  
Old September 26th, 2017, 21:19
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Re: Where would I start??

Quote:
Originally Posted by vertrx View Post
Ok, so it sounds like it might be a cracked head subject to some further testing. I'll check the plugs if they show any moisture.

I'll check radiator to see if it has bubbles in it? Will they show up before or after thermostat opens...hot or cold?
..........
The plugs might not show signs of moisture, but they will
be discolored compared to plugs on the good cylinders.

The bubbles will show up after warm-up. It might take that
much time for the cracks to open up, if that's the problem.
There will also be sooty residue floating of top of the
coolant in the overflow bottle.

The fact that the problem cylinders aren't adjacent, makes
me think the head is cracked. A headgasket will sometimes
blow between two adjacent cylinders. The only surefire way
to tell if it's a headgasket failure or a cracked head is to
pull the head, since the symptoms are the same...
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  #15  
Old September 27th, 2017, 16:57
tn_outside2003 tn_outside2003 is offline
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Re: Where would I start??

I have a 2000 XJ. When this happened to me....it was the head and/or gaskets. I didn't check. I knew what it was and purchased a TUPY head from a newer Wrangler and had the new head reworked at the machine shop and then paid a mechanic to swap the heads for me. Problem solved. I can't promise you that it is the head or gasket. But I can say that I would not pull that head without replacing it with a TUPY head. Too much work. Gasket or head....who cares? You get both when you swap the head for the upgrade.

I did not have a coolant or oil leak either way through my head. Nothing was contaminated or violated. Just misfire codes and obvious misfires when driving. A couple of times the engine got so pissed it entered limp-mode and started flashing the CEL. Had to pull over, turn off engine, use my OBDII reader to clear the codes, restart, resume minor misfires, and continue down the road. Real PITA.

Of course....it may not be the head and/or gasket. But it was for me. And I don't know which one. Probably the head. Quite likely just worn out valves. It was around 165,000 miles or so at the time (205,000ish now). Who knows? But my gut instinct, for the 2000 and 2001 XJ's, when random misfires start up....it's the head/valves/gasket. And again...rebuild a TUPY, not the original.

I could be wrong.

Last edited by tn_outside2003; September 27th, 2017 at 17:17.
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