2003 Chevrolet Duramax Injector Problem?

[Jgreer103]

I bought this Chevrolet Duramax last year. this beast has sorta blueish grey smoke when it idles. Smells like unburned diesel. I put my diable predator programmer on it and read the live data and this is what i have.

@678 RPM

(Fuel Injector Readings)
#1 3.5mm3
#2 2.4mm3
#3 .8mm3
#4 1.7mm3
#5 2.8mm3
#6 -2.9mm3 (Negative 2.9)
#7 -5.0mm3 (Negative 5.0)
#8 -3.2mm3 (Negative 3.2)

5% Engine Load
142F ECT
96 kPa map
678 RPM
0 MPH
118 IAT
40 q/s maF AirFlow
False Power Take Off
0% EGR Duty Cycle
3869 PSI Actual Rail Pressure
3891 PSI Desired Rail Pressure
2.0 Degree Injection Timeing
6.7mm3 Fuel Rate

Also For Some reason the programmer tells me that it does not support this model for programing but it will program my 01 gmc duramax just fine. I almost think that the engine was changed before i got it. Plus i think that number 1 injector is going out but i may be wrong as it is the highest. so may have a few issues inside this beast. Thanks for your feedback fellas

 

[mike diesel]

Your #7 injector is the worst. # 1 is still in spec. Engine coolant temp is still a little low to be taking these readings. You want it at operating temp. Also your desired and actual rail pressure seem low. Normally should be around 5000psi or so. If you have a haze and smell raw diesel out the tail pipe...you need new injectors. Is your truck making oil?

 

[TLyons90]

Sounds like its injector time. Have you checked your oil for fuel smell or a rise in your oil from fuel going into it?

 

[Jgreer103]

i have checked the oil regularly. it does not smell like diesel yet.. is it cheaper to get a different engine or just replace all the injectors?

 

[o4dirtymax]

i have checked the oil regularly. it does not smell like diesel yet.. is it cheaper to get a different engine or just replace all the injectors?

Are you going to do the work yourself or have it done? How many miles on your engine?

Fill out your sig so we know what you're working with

 

[Jgreer103]

2003 Chevrolet duramax, short box, 317K miles. will do the work myself. runs good still just seams like it needs more power. the smoke was a dead give away. the turbo is kinda loud but uniformal. the transmission is still shifting stiff so no problems there. i run 15-40 Rotella oil in it. coolant dissapears lil by lil over the last few months.. so im thinking either rebuild it or buy a replacement engine.