What tests can the dealer run on the injectors using the DRBIII? I know one of them is the kill test where they can shut down injectors one by one to isolate a misfire. And I thought I read somewhere on here that they can also compare fuel flow through each injector to match it up to spec. Is this possible? Are there other tests they can run?

I've got a friend with an '04 (same one that just had the lift pump done) that is still getting white/grey smoke at idle. It's definitely not cold enough that it's condensation, and it does it even after the truck is up to temp. Says he hasn't had any issues with hard start or rough idle, but it definitely has a smoking problem. And you can smell raw diesel in the haze coming out. I'm still leaning towards a leaky injector. Dealer says that the computer checks out, but all they're doing is running a scan for codes. I wanted to see if there were specific tests that could be asked for (in case they're not aware or stalling). Only has 10K miles left on warranty, so he'd rather find the problem sooner rather than later.

Going to give the truck a strong shot of PS Diesel Kleen this weekend to see if that helps matters any, as some people on here have had luck with it. I know some dealers have been chalking it up to idle time or no load, but this truck doesn't see much idle time and it sees plenty of loads (20K+).

 

if your still smoking white or close to it when warmed up , you really should just remove the exh manifold and check which cylinder is the problem child, there are test out there , but sometime these test only cannot find the problem. you have to remember the injector is part mechanical and part electronic, so we can control the electronics part with a computer, but if the problem is in the mechanical part you wont have any control over a needle valve in the injector or cup. so remove and observe and you will locate the problem. there are also caps that are made to remove the injector line and cap off the common rail and that works most of the time , sometime not.

 

Where can you buy these caps ? Can you drive the truck with one of the fuel lines capped off ?

 

The ECU will return relative flow readings on each injector but its not very accurate. In addition DC has widened the range so much to keep the warranty replacements down that the data is useless. If you can't talk the dealer into replacing the injectors you are on your own. Either find a reputable diesel shop to do the work or take to a certified Cummins shop that will work on it. Not many choices when the dealer refuses to see the obvious.