Kinda Unhappy With G code Injectors

[icanfixall]

I have seen some smoke every morning cold startup and I have around 9000 miles on my rebuilt motor so far. Yes, I have a Moose pump but this smoke has not changed with either stock turbo pump or the Moose. Some cold startups sound like a gasser thats on full choke and just about ready to stall. When this happens I add some rpms and it goes away but the running rpms are already around 750 when this is happening. My thoughts are the injectors are not fireing correctly. Even after warming up I can see smoke dirfting by the truck if the breeze is blowing forwards. Its very lite but I see it and don't like it much. I have not pop tested them yet. Would the BB or C or D injectors work out any better for me? I know the G injectors have a higher pop pressure but I'm not sure about the EPA fix that may have been done so the motor could pass immions standards. This is about the only place a refinement could be made to and already installed motor to satisfy the EPA on an older motor like ours.

 

[FordGuy100]

It kinda sounds like you have an injector or two that isn't working properly. Especially if you are seeing a slight amount of smoke idling when warm. Might wanna pull them and see what they look like, and test them out. Might be bad spray pattern's .

 

[icanfixall]

Justin... These are a new set and the other new set did the same thing. I bought them from differant suppliers on Ebay so I dought they were a bad bunch from Stanadyne but I'l pop test them and see. I know Towcat pop tested about 50 sets and found no real differances in most of the patterns. I do feel a good pattern is needed. Maybe its time Mel and I got together and make up a set of multi ported hi po injectors.....

 

[riotwarrior]

..... Maybe its time Mel and I got together and make up a set of multi ported hi po injectors.....

Ya Ha!

 

[tractorman86]

i agree, and i will be the test dummy if you supply the goods!!

 

[Agnem]

Sounds typical of "leakers". I've seen cold injectors fail to seal up and they dribble any old time they want, resulting in fuel in the cylinder during any of the 3 other cycles that there isn't supposed to be fuel in. If you put them on a pop tester, you will see it. The drips also mean the timing is retarded during the next injection cycle.

 

[FordGuy100]

Agreed, Moose injectors

 

[flatlander]

You might also try a full blast dose of your favorite additive. Mine smoked bad after initial start up and I put on a new fuel filter with straight Stanadyne and it cleared up.

I'll 3rd the moose injectors.

 

[6.9poweredscout]

i'm not afraid, lets try some moose injectors, after i buy a moose pump too!!

-Jon

 

[discbrks]

I'm gonna jump in on this G code problem. I put in a set of Delphi G codes - no turbo yet (if that matters). It has a rough idle, almost like a gasser with a small camshaft. Sometimes I get injector knock, and sometimes I don't. This prompted me to build an injector tester. If I get a clear weekend I'll pull them and test them all, but I suspect a few dribblers.

icanfixall - how's your idle?

 

[icanfixall]

My idle is a little ruff but only at times... Then other times its smooth a silk. Occasionally on a warm starup after running some distance it sounds like diesel has drained down somewhere because it will crank and very slowly catch and slowly liteoff. Almost sounds like trying to restart a flooded gasser. I have been looking for leaks but none found yet. All injectors and return lines are dry. So maybe a dribbler or two will be found later. I have a tester but I have to assemble it first with a 5000 lb gage so I can see the pressures.. Kent Moore has an ausume injector tester that has a fluid resoviour made into it. I don't know about how it filters the fluid yet. I use 3 oz. of Stanadyne Performance in every tank full.

 

[geonc]

When you do pull the nozzles, turn them over and drain out the fuel onto a white paper towel.....if the fuel is dark that means combustion gasses are getting up past the seat...indicating either scarred {doubtful if "new"} barrel or weak seat sealing pressure...either way --builder/vendors responsibility!

 

[Mr_Roboto]

Did you retime the engine? Higher pop pressure means later injection timing.

When I bought a new set of Stanadyne G codes at least one was not assembled correctly and basically had no spring pressure on the pintle.

 

[f-two-fiddy]

FWIW
I'm not impressed with my 'G's, either. I've got the same symptoms as Gary.

I'm going back to 'D's, next time.

 

[Optikalillushun]

thats weird cuz i have absolutly no issues with mine. now next time i run it, it'll run like crap!