blowing smoke

[Gardiner]

Truck never used to smoke.



Pump died... ... rebuilt pump (230 hp) and new bosch 190 injectors were installed, pump was advanced and 20,000 washers used with the injectors. Lift pump is less than 1 year old.



Truck now smokes..... like all the time blue haze at idle warm or cold. It will also leave a haze trail when slowly accelerating from a stop with no load. Crusing speed, no smoke. The AFC has been backed out pretty much all the way. Truck idles normal, accelerates good (with a mighty puff of black!!), boost is around 28 max and everything else seems fine other than the constant haze. I am using stanadyne fuel conditioner as well..... the haze is the same regardless of if I'm using B5 biodiesel or straight up diesel. No oil is being burned either.



Would something be off with the pump tweeks that were done at the rebuild? Or do I maybe have a bad set of injectors.



This is driving me nuts and I want to deal with it while the parts are still under warranty.



Any ideas?? Thanks.

 

[DValentine]

Blue smoke = burning oil. Mine smokes more in the winter at start up than in the summer. I use the same oil in the summer and winter. I think you mean . 20" for the size of the injector washer. :-laf I put a new head on my truck, with new valve stem seals and I figured that the truck shouldn't smoke... . but it does.

 

[Gardiner]

It's not burning any oil... . the smoke started immediately after the pump and injector install. I thought it was normal at first until I started talking to other people with a similar set up.

 

[dpuckett]

Injectors/ fuel system issues will also make blue smoke. Try using a different thickness of washer (maybe a . 060; definitely not a 20,000 or even . 20 ). Whom did you get your injectors from? Just because they say "190" doesnt mean they are the same ones PDR developed in retalliation against Bosch's price gouging. If the spray pattern isnt an automtive pattern designed for our piston bowls, they will smoke and haze (i. e. PODs). ALso, if the pop pressure is significantly higher than stock, it will retard dynamic timing (again, see PODs).



I'd start by getting them tested. Then check your pump timing. It can make a difference, and the symptoms are similar if you go too far one way or the other in timing. Make sure your supply pressure is at least 5psi, preferrably 7-8. Minimum under load is 3psi. check your supply hose for restriction or internal rotting. If it is more than about 5years old, it is due, esp with the new fuel eating stuff up left and right.



What kind of EGT are you seeing (max and cruise), and it is pre or post turbo?



Daniel

 

[Gardiner]

Boy I'm getting burned on the 20 thou washers .



I purchased everything from PDR..... the injectors are supposed to be brand new, not rebuilt. The pump is abvanced 1/16th" from the timing mark, thicker washers were used at first, but were changed on advice from PDR. The fuel supply line from the lift pump to the pump is quite new, but from the tank to the lift pump is maybe original? My EGT's are between 500-800 crusing (post turbo), it will hit maybe 900-1000 with my foot to the floor and with a load.



The injectors are only a few months old, I just want to rule out any other possibilities and then send them back for another set if it looks like these are causing me grief. I'll get the fuel pressure checked out first.

 

[dpuckett]

I've had trucks that were at ~1. 5mm in "stock" form, so check your timing, and also verify and find true TDC. Have your MPGs suffered any? I empathize with you on the smoke- it gets annoying. Not only is it wasted fuel, it is just plain rude, IMO esp in normal summer traffic when half the people have their windows down.



DP

 

[Gardiner]

The timing was advanced by bumping the timing marks up a 1/16th". The techs at PDR say that's all they ever do The mechanic who originally installed it had the marks lined up, moving it ahead seemed to clean it up a bit, but not entirely. The truck seems to act like the timing is still retarded. Maybe I'm retarded... . from breathing all that diesel haze!!



I would say the MPG's have also suffered, not a huge amount but enough to notice (50-75 km less per tank).



This set-up was done exactly how PDR said to do it. Based on that, does it seem like a part is faulty or is it still a timing issue?



Thanks

 

[CumminsKid]

Gardiner

Where did you get the buulydog exhaust, I couldn't find it on the website.
thanks

 

[dpuckett]

I am ashamed to admit I didnt think of this earlier. If you still have your stock injectors, get them pop tested. Atomization isnt as important as pressure. If they are popping low, with the new sticks likely popping higher than stock (or even at stock), they can be retarding your dynamic timing, giving the same symptoms as retarded timing. Or you can try bumping the timing another 1/16" If you dont like it, move it back to where it was.



DP

 

[Gardiner]

I'm not sure what dynamic timing is?



I'll advance the pump just a bit more, it's the easiest thing to try. Why wouldn't the new injectors be set to pop at the right pressure if they are for my truck? That is why I am thinking maybe I have a bad or incorrectly calibrated set??



thanks

 

[dpuckett]

Static timing is what you set when you get out the dial indiactor and find TDC.



Dynamic timing is the time (in degrees BTDC) at which the fuel is actually injected into the combustion chamber. A higher pop pressure will have the same effect as retarding the base or static timing, as it takes a little longer to build the pressure to pop the injectors open.



Daniel

 

[Gardiner]

Thanks for your help Daniel, I'll try what you suggested.