600 injectors

[favord]

Pretty fed up with the fuel mileage (13mpg empty today) and have read of a couple folks with Jan. build dates like mine swapping out injectors with good result - they also were experiencing a stumble which I'm not. I want to discuss swapping out injectors with the dealer when I go in but wanted to be armed with a little knowledge. I doubt they'd just swap them under warranty for just a mileage issue but that'd be the ideal. Wondering if they'd maybe go for a 50% cost, just labor cost or something else if I bargained right but wonder what they'd go for... ?? Worst case I take it to my good local Cummins shop and have them swap them out on my $$ or wait for an aftermarket set but I haven't even heard of a vendor marketing any yet. Anybody have an idea what stock injectors would cost? Any aftermarket injector rumors yet for the 600?



Doug Favor

 

[klenger]

I've heard they are very expensive. I'd offer to pay a reasonable diagnostics charge to determine if they are bad. If they are, the whole thing should be warranty, if they don't find anything wrong with them, they you pay the diagnostics fee and maybe have a bit more piece of mind.

 

[Apence]

Well I took my truck on a 300 mile round trip to the dealer I bought it from, because the local dealer has had it 3 times reflashed it twice and still no power and i got a whopping 13. 5 mpg with cruise set between 70-75. diagnosis is injector #6 which from what i understand wasnt diagnosed by the tech but star told him they are having problems with injector #6 on some 600's. well we will see in 2 weeks when i gets here, but im not expecting much improvement. this will be the 4th trip and to say the least I am pretty disapointed with the cummins 600 power and mileage so far

 

[favord]

klenger, good idea. Of course, I'm not sure I'm too trusting of the dealer's diagnostic abilities or motivation for finding something wrong. How/what might they eval. or interrogate to assess the injectors? I know they can check them one by one but what are they looking at? What questions can I ask about injector performance? Would this be better performed at a Cummins service shop and take their data to a dealer if something looks amiss?



As much extra as I'm spending on fuel, I'm willing (reluctantly of course) to fork out some coin to get it straightened out.

 

[jwilliams3]

I am getting similar mileage.

I think its more an emissions programming issue.



Your injectors are fine IMO.



--Justin

 

[thames1948]

I am getting about the same mpg's and just don't understand how some of the other 600's claim 18 plus. I drive mne easy and last time I ck mine , it too is still a 600. I had mine ck at the dealer and told me everything is ok and they iust said let it break in. Had 2000 miles then

 

[favord]

Seems to me we'd all be in the same boat if it was purely emissions/timing related but apparently many 600 people are getting very acceptable mileage. Seems like the newer builds especially are doing well and many Jan. builds extremely poor. The reflash that brings the Jan. builds up to date doesn't seem to help mileage so I don't think timing is the big deal. I've read a couple posts on another forum where new injectors made night/day difference in mileage so I'm thinking the Jan. builds just have a poor run of injectors. Maybe... ??? Worth looking into.

 

[klenger]

I think favord is right on track.

 

[Buzzer]

Originally posted by klenger

I think favord is right on track.

Maybe so, but my engine was built the end of February per the sticker on the valve cover and the best I've done empty is 13. 3. I'm going to opt to run it some more before I have anyone tearing into it. JMO