we jsut put new injectors in my brother inlaw 96 f250 well it smokes really bad but we can unplug #6 and the smokes stops what do you guys think
thanks

 

What color is the smoke?

 

blue and white smells like diesel fuel

 

Sorry for all the questions but are the injectors new or rebuilt? Stock or larger injectors? Also was that the only work done to the truck?

I would have to believe that there is an injector issue. You could switch the injector with one next to it and see if the same thing happens.

 

we did switch the injector same thing and rebuilt stage 1
truck runs good just tons of smoke

 

Well its time to pull it out and talk to the person that built them. There is something wrong inside the injector

 

if it where the injectors it not be the same # 6 right

 

If it were the injector the problem would follow the injector. So if it was number 6 then you put 6 into cylinder number 4 and it smoked until you unplugged number 4 now then the injector is the issue.

Is that what happened or did the issue stay with number 6?

If it stayed with number 6 even though you moved the injector there is either a mechanical issue with that cylinder (no compression) or there is an electronics issue holding that injector open.

 

Pull the valve cover and take a straight edge and lay it across the solinoids. If the problem stayed in #6 most likely the nozzle seal (copper washer)stayed in the injector bore from the old injectors. The straight edge will show this. That will cause issues similar to this. Just a shot. Or, there has to be a problem in the injector itself. But if it stayed in the cylinder, inspect the injector cup very closly for cracks or the copper washer. Just my .02

 

Cody the part that has me puzzled is that it goes away if the injector is unplugged...... IDM issue holding the injector open???

 

I would suspect the injector itself before the IDM. I missed that part. Or as simple as UVC harness burnt, or pinched. This is a strange one.

 

has to be elec as in idm or frayed wires. check the wire harnes as it rund over the driver valve cover and inspect all of it. if you have access to a scan tool run an injector electrical test. if you dont you could try idling the truck with the valve cover off and use a stethescope (screwdriver) on the solonoid to see if its staying open or if its pulsing.

 

If it's staying open, the ejector spout would just pour oil instead of spitting it.

 

good point, you could also use a voltmeter and see if power is being given at a constant.

 

we have found a bent rod in #6