The White Whale Died again!!!Help

[73-bronco]

So this is what I've just replaced/fixed. Head gaskets, ARP studs, Machined heads, Bulletproof EGR, Bulletproof oil kit(by the way bulletproof is top notch), all new injectors, fresh oil, new coolant. Cleaned inside and out truck looks and WAS running great. I've put about 300KM on it since I finished all that and today there was a little hesitation under slight power at hwy speeds, once it down shifted it was fine. did it a few times didn't think much of it. Later today more hesitation loss of power and white smoke. Pulled over got a tow back to my shop. I've smelled the exhaust its definitely unburnt diesel. Could this be a FICM which by the way was replaced about 6 months ago. Or any other ideas. Here's a link to a video. You might be able to hear what the engine sounds like now too.IMG_1166.MOV - YouTube

[JasonY]

Sounds like an injector problem to me. probably need to disable each injector one at a time to see if the knock stops. An injector may be leaking fuel into the cylinder causing the knock and smoke from the exhaust.

Jason

[TerraScaper]

I could be out of the park on this but, I remember seeing something about a ballon test to check for leaky injectors. I think you can pull the ficm plug to crank the engine over and see if you are getting bubbles in the fuel bowl, if you are then compression is getting into the fuel system, maybe a bad copper gasket. if you see bubbles then you can narrow down the side installing a ballon on the fuel line, I think a rubber glove would work too, and then narrow down the cylinder by removing glow plugs. Do a search and see if the symptoms come back similar.

[73-bronco]

I was finally able to free up some time to take a look at this. No bubbles in the fuel bowl. I pulled the lines off anyways and did the balloon test...nothing. rechecked the voltage on the FICM and its sitting at 48. Soooo now what? Could I not be getting enough fuel to the injectors? Is there a way to check fuel pressure? The fuel bowl filled up fast when I didn't have the fuse pulled for the fuel pump.

[73-bronco]

Bump

[dannyboy950]

Next time ya have it cranked shake/wiggle the wireing harness to each bank, see if the motor changes up. You may have chafes in the wireing.

You can have the best FICM in the world but if the signal doesn't get to the injectors it don't do a bit of good.

[73-bronco]

I started pulling off the harness righ at the injector. The driver side front is not working. Is there a way to check voltage right at the injector? I'd like to figure out if it electrical or mechanical.

[dannyboy950]

Darn I can not remember now but there is one of the old noid lights that the plug was spaced the right distance apart. It was good for a quick test. You can use a dvom set on 48v and have a helper roll it over.2 wires should be 48v; 1wire is for glow plug 12v.

You would need to check the pin out on the plug from a schematic.