Miss at all RPMs

[TFaoro]

We need to hire some kid to ride a bike between us   I don't think a slight difference between valve movement would cause the engine to miss though. And if it was an intake it would definitely cause some smoking. 

[Yankneck696]

Just trying to come up with an answer for something that I cannot answer....

 

Ed

[Dieselfuture]

Could it be bad fuel

[TFaoro]

Could it be bad fuel

Nope... I've been through many full tanks of fuel and at least 2 or 3 filters. Everything has been spotless. Thank you for the suggestion though

[Dieselfuture]

No problem just thinking out loud, sometimes we overlook the simplest things.

[CUMMINSDIESELPWR]

i dont remember seeing if a borescope has been used to inspect the cylinder and piston crown for cracks or holes burnt through.  it would make sense if there is a miss or dead cylinder/partially dead cylinder.

[Yankneck696]

He has done compression & leakdown tests, 3 sets of injectors, crossover tube O rings, now had the pump inspected by Industrial Injection.

Ed

Edited January 3, 2015 by Mopar1973Man
Expanding the acronyms

[MnTom]

He has done compression & leakdown tests, 3 sets of injectors, CO tube O rings, now had the pump inspected by II.

Ed

Then like I said, check the valve train.......... A worn cam, bent pushrod, rocker arm issue, etc.

[Killer223]

i might be way off here, and may have missed it. but don't the cross over tubes have some sort of screen in them? maybe one plugged? won't a cracked ring do this as well?

[Yankneck696]

He also swapped out drilled crossovers, too.

 

Ed

[mulcher812]

Ok so how about cam or crank sensor? They may not be faulty all the time but random faults from engine vibration could cause the same kind of issue.

[TFaoro]

Ok so how about cam or crank sensor? They may not be faulty all the time but random faults from engine vibration could cause the same kind of issue.

Good thought, but I have a scangauge and the rpm meter on it does not bounce around or drop to zero. 

 

I will go through pushrods and rockers tomorrow. 

[Dieselfuture]

Is there a way to crank engine over without starting, if so maybe try cranking it over and listen for any odd miss. From what I heard all cylinders should sound same and if there is an odd one then you know it might be something internal.

[MnTom]

Is there a way to crank engine over without starting, if so maybe try cranking it over and listen for any odd miss. From what I heard all cylinders should sound same and if there is an odd one then you know it might be something internal.

I don't know if that would do much. Since there was a compression test done and everything so far checks out good, there isn't much left to check.

[CUMMINSDIESELPWR]

just a wild thought...  is there an extra copper washer in #6 by chance?  just throwing darts now...

[mulcher812]

The scan gauge is seeing everything that the ecm is seeing. I think the crank sensor goes straight to the vp. So try wiggling the wires when its running and see if it stops.

[Yankneck696]

Crank/cam sensors go to the ECU. The VP44 has it's own tone wheel & hall effect sensor.

 

 

Ed

Edited January 2, 2015 by Yankneck696

[eddielee]

After reading all that you have gone round with it is difficult to find any new suggestions.

However, I will ask if you have biodiesel available in your area and if you ever use it.

It is an excellent cleaner and has great lubrication properties. 1% bio increases the lubricity of your fuel by 1000 from what I understand.

Just make sure you get it from a good supplier so there is no water in it.

 

I assume when you say crossover tubes you are talking about the fuel lines between the engine and the injectors.

If not then I would ask what the condition of your fuel lines is.

 

Biodiesel should help either way, use a couple gallons per fillup to improve lubricity and clean the system.

[Yankneck696]

Crossover tubes are the part between the injector lines & the injector, going through the side of the cylinder head.

 

Ed

[Mopar1973Man]

Wild shot in the dark. How about the wrong thickness copper shims being used on one the injectors?