[miramadar]

A few months back, I bought a used 1993 F350 with the 7.3L IDI with 260k miles. The truck runs pretty good, but it smokes white for a few minutes after a cold start. After it warms up, no white smoke. What causes that?

My main issue is that I replaced the injectors last week because I was having significant leaks from them and the fuel was pooling up on the motor and running down...onto the exhaust and ground. I could have just bought new O-rings, but I figured that with this many miles, new injectors would be a good investment.

Well, I orded the injectors from Diesel Care Inc . I ended up getting remanufactured injectors because new ones were on back order until the end of the year. The reman injectors cost about $17 per. Anyway, my brother-in-law and I spent the better part of this past Saturday replacing them. Things went pretty smoothly, but we found that we couldn't get a reman injector to screw into one of the ports. We tried 2 or 3 of the new injectors, but none of them would start in to the threads. We ended up just putting one of the "better-looking" old ones back in.

Well, since then, I've been driving the truck back and forth to work...about 22 miles each way. Along the route, there are some pretty long, steep hills. I notice now that the truck really bogs down on these hills. It goes down to about 1500 rpm and will not accelerate at all...in 4th or 3rd gear. It just stays at 1500 rpm (about 40 MPH in 4th gear). I held the accelerator all the way to the floor...no difference. And I didn't see any black smoke coming out the exhaust either.

On flat land, it picks up just fine. It just stinks at pulling hills now. And this is unloaded. I wouldn't think of hauling my tractor with it now.

A little research on this site enlightened me to the fact that there are different types (codes) of injectors for my truck. I happened to have the injectors in the floor board, so I pulled them out. The original injectors are stamped with "D". The new injectors (remember, I have one uninstalled because I couldn't get it to screw in) are stamped "BB". Would that make the difference?

I have replaced the fuel filter and that didn't help anything. Any ideas??

:boohoo:

 

[Terry in Md]

Try advancing timing. New injectors will usually cause a retard in timing which could account for the white smoke when cold. I would try to replace the old one as it's timing may be more advanced than the replacements due to the probable lesser opening pressure of an older used injector.

 

[cdnsarguy]

Never mind a timing change.........Send them back........

http://forums.thedieselstop.com/ubb...=c184b997f0f6d99dbffaf1b882044db7#Post3105346

The guy sells crap....................

 

[miramadar]

Update...

Well, I took the "new" injectors out and put the "old" ones back in. The truck still didn't pull a hill well...wouldn't accelerate up a hill, even in 3rd gear. I looked it over and found that I had left one of the injectors a little loose in the engine block. Also, there's a tubular plastic piece that goes inside the spring on the throttle cable. This had broken and chunks of plastic were interfering with the spring itself. I figured it might have been inhibiting the throttle. And, I cut away some of the rubber floor mat where it had bunched up around the accelerator pedal.

Well, it runs like a champ now. Accelerates up hills, even in 5th gear (OD) on some hills! And, there is very little white smoke on a cold start-up. It used to smoke like crazy for like 10 minutes. Now there's white smoke for maybe 15 seconds.