Just got done troubleshooting my jeep. Thanks for everyone in the other threads help. I have replaced:

Head gasket & header (3months)
Cap and Rotor
Plugs and wires.
CPS

I've checked the.

Fuel pressure 40psi
Spark & Coil
Injectors
Compression 145ish
Valve Seals.

It'd still has a misfire on cylinder 5 and sometimes other cylinders, sometimes it runs great, sometimes terrible. 50% of the time white smoke comes out of the back sometimes it doesn't. And chances are it's taking in water, so most likley it's a head gasket, but I don't understand how it could ho bad in three months, Im waiting for it to cool down, and Im going to re-tighten all the head bolts to the right tourqe specs, as a last ditch effort. Is there anything else it could be?or have I narrowed it down?

 

did you torque all the head bolts to the right psi?

 

You said you did the head gasket and headers 3 months ago? Did you replace the plugs around this time? What do the plugs look like, is coolant missing? specifics are helpful on tracing this but I would suggest testing that CPS, even new sometimes you get a bad one and you problem still exists.

 

yes when you replaced it last time could you tell where it had blown out?

 

I torqued them all down to the exact specs in the correct order. Step By Step.

The plugs were brand new when I replaced the head gasket, The plugs look normal, except for cylinder 5 which has oil in it, but it is sparking, just misfiring, also throughly checked the rockers, and looked for bent rods, as well as valve seals, my exhaust valves were all replaced when the head was machined. I am 90 percent sure im losing coolant, I don't think either of the CPS were bad. I did test them both, However the testing procedure did not work for either of them, traced the wires to where they belong and they look normal.

Yes, Between cylinder 4 & 5 there was a hole in the gasket. Right through.

 

Don't know where your coolant might be going because you said "might be" .Did you add coolant?

Anyway, a bad injector can also cause a missfire. You could have one (number 5) with a leaK down (not fully seating closed) will cause missfire.........can't always blame the spark plug.

 

Like ***** said -- also interested to hear how much coolant you've added and how often to check the level. You ever take the valve cover off and check the oil color after it ran at normal engine operating temps?

 

There are a couple of things I have to ask. Have you done a pressure check on your cooling system? If you have oil on #5 plug that means it is oil fouling.. did you replace valve seals when the head was machined? Have you tried changin it.

Also as ppl pointed out other thing could be causing the misfire. Try moving the plug wires around.. by this I mean changing number 2 for number 5 and see if you miss moves to another cylinder.


All this is mute. if you are loosing colant though.

 

I have added coolant, but not slot, some of it might be evaopration now because I continue to add water and bot antifreeze. But the injector is firing, I can hear it clicking. I don't understand what a leak down is, could you explain it, and what I can do to test it, thanks in advance.

 

I've had to give it half a quart two times, but I'm not sure the coolant water/mixture was right to begin with, the oil color is brown, its due for a oil change, it doesnt appear to have water in it.


I have not done a pressure check on the coolant system, What would this tell me if I do do it though, I am 90% sure I'm losing coolant, but It could be just because I'm only adding water, recently because of the whole situation, I will try changing the plugs and see if that changes anything. Should it move to another? or should it stay the same?

 

did you have the head pressure tested before re installing?

 

Yeah, I took the head to a very reputable machine shop in another town, he surfaced the head, and the intake/exhaust, replaced the exhaust valves, shimmed the springs, pressure checked it, checked it for cracks, and replaced the valve seals

 

You're right, I believe. White smoke is water. Black smoke fuel, blue smoke oil.

Do you have a cracked cylinder?

Take the radiator cap off.

Start it.

Bubbles?

 

Only right when I start it, otherwise no.

 

How long did you let it run with the rad cap off to decide this? Did it at least start to warm up?