What are signs of injector coking? I've noticed my truck idles fine at first but once warm has a bit of a rough idle. I crank up the 18k mod knobs just a bit and it smooths out while increasing the idle to 750rpm, rather than the stock 650/675rpm.
I do not detect any miss under accelleration. The truck runs great except for a slightly rough idle. I doesn't ever die, just a little rough.
I have yet to run any biodiesel and hope this will clear it up. I'll try some more Power Service.
We haven't had any really cold weather yet... some mornings at freezing but mostly 40's to 60's. Right now its 82 degrees!
2002 F-250 Lariat, PSD, CC, short bed, 3.73, auto tranny, Line-X bed liner, AFE Filter, HX crossover, intake heater delete, Evans NGC+, Dieselsite 203 thermostat, coolant filter, Amsoil by-pass filter, Schaeffer's synthetic blend tranny fluid, Bob Riley's tranny filter, Velvet Ride shackles, Rancho 9000 shocks with in-cab adjustment, 60 gallon aux tank for burning heated WVO, burning veggie since fall of '04.
In my experience the only way to make sure of injector coking is to pull the injectors.
On the 6.9 this is pretty straight forward, but on the newer Powerstrokes it would I think be a real hassle.
A very detectable miss in the engine would a sure sign that an injector was either plugged of blocked.
Try the simplest solution first, the liquid cleaning agents for diesels are very good at removing deposits.
The Green Monster: 2001 F250 Powerstroke, 2WD, ZF6 transmission. Bully Dog GT Tuner set in tow mode. MotorSilk boric oxide added to engine, transmission and diff. Showing 30mpg on the freeway running home brew biodiesel. NTZ 1/2 Micron bypass oil filter. Dieselsite coolant filter. 4" open turbo back exhaust. Ford AIS intake. Donaldson ELF7405 oil filter. Caterpillar ELC next on the list.