Smoking in a Non Smoking world.
About 2 days ago I noticed that my truck has started to smoke, lots of nice black smoke.

If I take off easy it is OK but when I give anything over light throttle it will smoke until the boost comes up, I have not had a chance to look at it yet, what do you think has happened?

The only thing that I have done to it in the last few days was to get a load of fuel and the regular dose of Lucas.

I still have plenty of power, boost and it does not feel like it is restricted but I will check the air cleaner tonight.
It is doing about the same as when I had my 6.2 and the injectors finally gave out.

Tonight I will check all of the boost lines, fuel and air cleaner, I have never touched my smoke screw but why should it suddenly change?

Is there anything that I can run through the fuel that will really clean my injectors other than removing them?

Thanks Jim

 

the starwheel would play the largest roll in smoke before the turbo lights. Perhaps somehow it worked its self down over time. Or maybe an intercooler boot grew a leak somehow.

 

Ya think the 100*F air y'all got might have something to do with it? (hot = thin).

 

Yesterday I removed the top from the AFC housing and everything looked ok except for the pin was sticking a bit when I moved it back using a small screwdriver, I cleaned it up, turned the wheel out 1 turn and closed it back up.

I then removed the air filter and checked to see if it was dirty but it was ok, I then started and ran the engine up to make sure that the turbo was not having any issues, again all was well, with the inlet open it sure makes a nice whine like it could break glass, I probably hurt the ears of all of the local dogs.

Replaced the filter and reconnected all of the tubing then I rechecked all of the linkages and boost lines.

Then I went for a ride, It still smokes like a train if you pull away from a stop using moderate throttle, if you take it easy then there is no smoke, about 40 MPH and blip the throttle it will let out a big black cloud.

Then I got onto the freeway and I was able to make all of the cars behind me disappear behind me on the onramp but from 60 MPH to 80 MPH it will be clear under hard acceleration.

At one time it felt like I was loosing power and the boost wouldn’t go over 30 PSI but that cleared up, my top end power is not what it used to be either, at 70 MPH with the throttle on the floor it did not have the power that it did before, before it would pull hard up to around 90.

I am not sure what it was at before but at 70 MPH and you floor it I could go from 6 ½- 7 PSI Boost to 40 PSI ^ and then as the speed increased it would drop down to about 25 PSI.

It seems like I am getting full fuel right off idle, could the fuel pin stick in the full fuel position? Or is it possible something broke inside the pump?

Inside the VE what meters the amount of fuel in relation to the depth of the pin, is it the control sleeve?

The amount of smoke is synchronous with so only 1 injector could not be bad or I would see it pulsate more I would think.

Can the spring become weak and change the profile, Boost Pressure vs. Depth?



So come on guys why do you thing is just stared smoking, give me some ideas.

Hey, I think I found my clunk.



I will pull my pump apart in a minuet if you give me some ideas what to look for

Jim

 

Which pin was sticking Jim? The cone or the pin that rides on the cone? My pin sticks sometimes and I get smokey before the turbo lites. I lubed it a little and worked it back and forth but it still gets caught up sometimes. I am referring to the fuel pin that rides on the cone.

 

Might have the pop pressures reset. My trucks gonna have it done in a few weeks. Im trying to get it not to haze so bad @ idle when cold tho.

 

Definite possibility there.

Jim, what are your smoke screw and star wheel settings? You have turned the pump up a good bit. You will probably need to run the star wheel up and back the smoke screw off. Hogging out the inside of the AFC cover to let the fuel pin ride higher at zero boost will help as well.

 

Dave,
The Smoke Screw has not been touched and the Star Wheel is up 1 turn.

How should I adjust them?

Why has it worked for about 3 months with no problems, this is what I don't understand; the smoke only started 3 days ago. It came on like something broke or I got something in my fuel.

Do you think that slamming the AFC with 50 PSI boost has anything to do with it?

I will try this when I get back from work.

Yes it has been in the upper 90's hear lately, when I was coming home last night at midnight it was 88*

Last night my speedometer stopped working, but the odometer works fine, already checked the sender any ideas?

Thanks Jim

The pin that rides on the cone is sticking.

 

Maybe for the last 3 months that little cone has been sticking and not adding fuel under boost like it should. Now it finally came loose and is working like it should and you're getting the added fuel!

I have the underside of my afc lids milled down flat, with M&H pins (M2 & M3), and it makes it a lot easier to control off idle smoke. But boy you can sure tell when the pin gets down in the groove and adds fuel!

 

that makes sense but he said its NOT pulling as hard on the top end now, the fuel pin has alot to do with top end.

I think over the last few weeks the temp/humidity has changed???

 

True, forgot about that. Maybe the lift pump has died, therefore not maintaining adequate case pressure and loosing timing advance. That would account for the increase in smoke and loss of top end.

 

Before you tear your pump apart, I'll tell you what I did when my truck lost power. Take the intake/exhaust off of the turbo, and find two plumbers caps to clamp over them. Put a valve stem in one of them, and fill your entire motor with about 40 psi of compressed air. Use a spray bottle filled with water and dish soap to spray all over any fittings from turbo to intercooler, intercooler to intake, etc. On my truck a lot of stuff needed to be tightened up, and we did the same thing with just the intercooler to verify that it was shot.

Hope this may help.

 

I was thinking the lift pump too...

 

Mine smokes like a train too if I stomp on it. I watched those video's you posted a few times and man if I stomped on mine to get that kind of boost and acceleration, I would definitely be fogging up the highway with black smoke. I actually had to back it down because if there was a cop anywhere within 1/4 mile behind me on the highway, they would be pulling me over for excessive smoke. This is only under acceleration of course but nobody needs to go looking for trouble.

I remember when I adjusted my starwheel on my 96. There was no smoke at first, Then about two weeks later it started. Almost like something was stuck and finally freed itself?

 

Smoke screw all the way out. You want the fuel pin to ride as high as possible in the bore without the little side pin catching in the groove at the bottom. This will require some grinding or machining on the inside of the AFC cover. Set the star wheel as high as you can without running into coil bind. If you get coil bind it ill keep the fuel pin from going all the way down and cost you power.

I think it's possible your fuel pin is stuck down.