Archived possible injector failure

[RWherley]

I have a 04 3500 with 322,000 miles on it and it suddenly started to idle rough and blow a fare a amount of gray smoke at idle as well, it has never done this before there are no codes in the system. the first set of injectors was replaced around 240,000 miles and I suspect one or two of the current ones has failed. Is there a way to test them with out removing them? I need to get the truck going again ASAP.

Thanks for any help.

 

[cerberusiam]

Not really. You could run a contribution test but that would just tell you what you already know, there is a problem. The only test you can really do in the truck is the solenoids and if they were that bad you should see codes. If the truck has been run without a constant diet of fuel condition\cleaner the first step I would do is an injector cleaning and a heavy dose of your favorite conditioner in the tank. If they are just getting sticky that might clean thme up internally enough to make the difference.

 

[RWherley]

The truck gets standine performance formula in every tank and we are real carful about where we fuel at, No above ground tanks or hole in the wall fill stations, maybe we are a little extra carful but I change the full filter with every oil change.

 

[cerberusiam]

Then it is a good bet you just have some bad injectors. Not sure how good the Stanadyne is but if it is a cleaner\conditioner it should be good.

 

[RWherley]

Just to check before I rip into it is there any thing else that would cause these issues? the air intake, turbo, and exhaust systems are clean and working properly

 

[cerberusiam]

Have you tried with the air filter out to make sure the filter is not plugged? Only other time I have seen something like that is when the filter got plugged and wet and partially collapsed. If the fuel and air filter are good, fuel pressure is good, you move to the next components.

 

[RWherley]

I check the filters are all good, right now I have no way to check rail pressure, but I figure if it were low there would be a code for it.

 

[Missouri Mule]

Could it be the infamous no.4 injecter line?

 

[RWherley]

Did that one once before, No external leaks.

 

[RWherley]

Fuel metering valve / celluloid on the CP3 is less then 5000 miles old, replaced with a new Cummins unit.

 

[Deleted member 995608]

Jay for giggles, unplug the FCA and start it up if ya haven't done that yet.

 

[cerberusiam]

right now I have no way to check rail pressure, but I figure if it were low there would be a code for it.

LP pressure is more important than rail with the rough idle and smoke. Usually get codes if both are off far enough, but not always.

 

[Bob4x4]

Just had a C/C today about 150k.Odd ball codes for low pressure.Found contamination(tons of rust).Replacing the plugged fuel filter and an injection cleaning bought him some time.Eventually he will need injectors.pump etc,