I talked to Keith today and he suggested that I try to unplugg injectors one at a time while running.I did this and when I pulled the number one injector(clostest to front of Jeep),it made it run ruff enough to want to kill,so I plugged it back in.The other three injectors had minimal change in the way the engine ran.Last that I spoke with Keith,I told him what I've found,and he decided I should try to bleed injectors 2,3,and4.
I blead(to the best of my ability)the injectors and still no change.
I tip my hat to anyone who has blead the #4 injector.Not easy.
To me it sounds like it's running on only 3 cylinders.
If you want to take the top of, the cams come with it. Lots of work.
You can test compression first, take out the glowplugs and fit a suitable tester to the glow plug hole.
I would stop starting it until you know what's wrong with it.
Toni,I wish that I didn't have to start it,but it seems to be the only way to troubleshoot at this point.Trust me,I really wish I didn't have to.
Actually Tony, what you just posted made something click mentally for me. Bub tried turning the engine over with the injectors unplugged. He got an expected code... But no unexpected or bad sounds.
If there was a rocker (or rockers) already broken, or really anything else mechanical at work here... Wouldn't that STILL be in evidence without any possibility of fueling?
Bub - Try this idea on for size before you get the wrenches out again: Unplug all 4 injectors again, and give the engine a spin.
Hey Jim,did what you suggested and listened closter,and sounded like I could hear it.I had my wife record it .
Verify that you don't hear anything like you did... Just to be certain. Then one-by-one, plug in ONE injector at a time and leave the other three out, and give it another spin. I'm not expecting the engine to start at all, but you SHOULD be able to hear that one cylinder fire. Hopefully the buggy cylinder at least makes itself known.
I didn't get this far because the mosquitos came out bigtime,and got slightly dishartened after hearing noise with injectors unplugged.Alternately, try the same test but with only one cylinder UN-plugged at a time. The engine *should* be able to run on three cylinders, but I wouldn't suggest it for long. My TDI ran on just 3 cylinders when it lost that injector line to the #2 injector... And oddly enough, the engine sounded almost normal.
You might also have an injector out of sequence on the colors. I just looked on mine, and the colors of one wire on each plug are (Front to back) orange, yellow, a pale-greenish, and pink. You could have two of them swapped. I know that on my old gas engines, if I had a plug wire misrouted, it would make some VERY interesting noises while running.
Varified that the injector wires are correct.This could be something as simple as the injector wires between #2 and #3 are swapped, I don't know. Or it could be that one of your injectors (going to guess #1 based on your description of listening) might be sticking somehow or drooling.
I'm no longer convinced that this would have anything to do with the cylinder pressures or the rockers, simply b/c without fuel... It didn't make the noise.
I'll let you be the judge of that. That tells me that this is related to combustion. Happening at the wrong time, wrong sequence, or somehow in the wrong place. The video to me, is inconclusive. The engine doesn't sound like it ever got up to full idle RPM, which would track with the air-in-fuel problem.