Lincoln LS 2004 V6 Cynlinder 2 misfire

[tlijun]

My Lincoln LS 2004 V6 3.0 has check engine light flash. It says the Engine Cynlinder 1 and 2 misfired with computer scan. I know the cynlinder 1 is in the front of passenger side, but I do not know where the cynlinder 2 is. If it is in the rear of cynlinder 1 on passenger side, and I want to change the cynlinder 2 ignition coin pad, do I need to remove the engine part on top it?

[joegr]

Fire wall
3 6
2 5
1 4
front of engine

[tlijun]

Joegr, thanks your response. Do you know if I have to remove the engine part on top of the cynlinder 2 ignition coin pad?

[joegr]

Originally Posted by tlijun

Joegr, thanks your response. Do you know if I have to remove the engine part on top of the cynlinder 2 ignition coin pad?

I don't know much about the V6's. I have heard that half of the intake manifold has to be removed to change coils/plugs on one side of the engine. I don't recall if that is the left or right side.

[dngrfld]

Just had misfire on #7 on 2001 v-8. Mechanic says burnt valve, he checked coil, etc. Big bucks to fix! I hope yours is minor.

[joegr]

Originally Posted by dngrfld

Just had misfire on #7 on 2001 v-8. Mechanic says burnt valve, he checked coil, etc. Big bucks to fix! I hope yours is minor.

Please double check this by substituting a known good coil. The coils on the LS are almost impossible to test for failures. Resistance checks (which is what most mechanics do) are completely meaningless because of the particular failure mode of these coils (internal high voltage breakdown).

Coil failures are common. Burnt valves are not.

[shorod]

Originally Posted by tlijun

Joegr, thanks your response. Do you know if I have to remove the engine part on top of the cynlinder 2 ignition coin pad?

Yeah, for both cylinder #1 and cylinder #2 you'll want to remove the upper intake manifold. There is one person that's posted that they changed the coils without taking the manifold off, but I don't see how that's practical.

-Rod

[shorod]

Originally Posted by joegr

Please double check this by substituting a known good coil. The coils on the LS are almost impossible to test for failures. Resistance checks (which is what most mechanics do) are completely meaningless because of the particular failure mode of these coils (internal high voltage breakdown).

Coil failures are common. Burnt valves are not.

I agree, it seems pretty unlikely that a valve is burnt unless you've been driving with a misfire for quite some time. Did the tech perform a compression check to justify the diagnosis of burnt valve? Did he put some oil in the cylinder prior to the compression check to make sure it wasn't just a washed down cylinder due to all the unburned fuel from a bad coil?

-Rod

[tlijun]

Hi, thanks all your response. I think I know that I have to remove the uppper intake manifold in order to change theCylinder #2 coil pack. But I am not sure after removing the upper intake manifold, do I have to change the upper intake manifold gaskets or not? I think if the gasket looks good, the there is no need to change it.

[dngrfld]

Thanx for helpful information. I will go to mechanic Monday and ask about using oil before compression. He put new coil on before trying compression. It is quite possible that unbrunt fuel washed cylinder as I had to drive a few miles to get car to him. Thanx again. Wish me luck!

[shorod]

Originally Posted by tlijun

Hi, thanks all your response. I think I know that I have to remove the uppper intake manifold in order to change theCylinder #2 coil pack. But I am not sure after removing the upper intake manifold, do I have to change the upper intake manifold gaskets or not? I think if the gasket looks good, the there is no need to change it.

For the 2002 model year the gasket is reusable. I suspect that to be the case for the newer ones as well.

-Rod

[tlijun]

All my concerns are clear with this forums' help, and it is ready to replace the Cylinder 2 coin pack and spark plug next week. But I just found the car have engine oil leak, it may be engine botom gasket leak. I put another post "Engine Oil Leak" in this forum.

[dngrfld]

Misfire on #7 on 2001 LS V-8, is valve, not coil, mechanic checked compression with oil in cylinder. He won't do the job, says way over his head, and amount of time needed. 30 hrs according to book. Definitely not a car for the faint of heart or thin wallet.

[shorod]

That's a bummer, haven't heard of that one before on the LS. At that amount of labor it may be less expensive to replace the engine with a good used one.

-Rod

[dngrfld]

Thanx for replies, I am going to check with a couple of machine shops, but will probably park it for a while and drive Probe Turbo for the meantime. I can't afford the repair or replacement, just had surgery and that will cost even more. I have a Toyota Supra or Datsun 240Z I would rather put the money in. Thanx again.