just purchased a 93 dodge dullie cummins turbo when you start runs really rough but will eventually smooth out excessive smoke on start like it's flooding and smells of really strong diesel. know nothing about the truck other than i traded for it like that any ideas. the previous replaced some type of o ring that stoped a feul leak and may have messed with the pump??

 

This is NO CUMMINS FORUM SIR!

 

Sounds to me like your engine is down on compression,most diesel engines will act just as you described .they seem to run pretty good one they warm up.the compression is not high enough to properly burn the fuel.

 

Get over yourself...He can ask about anything he wants...We've got people knowledgeable in all different vehicles here...

Tim

 

thanks man, that sucks can't afford to build that monster either. i also have a f350 diesel idi i thought that counted. if you had a ford you could ask about anything.
thanks for the info. thanks senior user for being so understanding and helpful.

 

What color is the smoke, white or brown/black?

 

The way I see it it's a general diesel forum, not engine specific. I don't see a problem. Sorry though I can't help with your original question.

 

Find out more about which O-ring was replaced, and where and why.

Running really rough indicates that the injectors aren't behaving correctly; either incorrect fuel pressure, or introduction of air into the injector lines. It could also be incorrect timing.

I'm drawing a blank on my B-series years, but I THINK the B-series changed pumps in '93, from the rotary pump to the inline pump. In either case, it's mechanical injection. The pump forces fuel through metal fuel lines and the injectors open once the pump reaches "pop" pressure. If the suspect O-ring is allowing air into the fuel lines, it won't be able to hit pop pressure at the right time, nor will it allow the correct amount of fuel into the cylinder. Air can be introduced at any joint from the tank to the individual injectors. Take a close look at all of them and see if any are leaking. Air can come in where any fuel comes out.

Additionally, if the previous owner was trying to "play," he may have greatly increased the pump stroke/pressure to get higher WOT fueling. In which case it may NEVER run right when cold until the pump is returned to something closer to a "stock" pump setting.

If it seems to run all right once the engine is warmed up, I'd guess it was a timing issue, which should be easily correctable at a Cummins or Dodge dealer, or perhaps an independent small diesel shop.

-blaine

 

the somke is blue like oil smoke but the diesel smell will knock you down almost burn your eye strong.
after it runs for a bit it runs super. he pointed to a place on the drivers side low on the engine and said it was because of a fuel leak. and he did say he thought the guy working on it turned it up, what up i don't know. after it's warm it runs awesome plenty of power and doesn't smoke at all blue black white or any other. it'll out run and out pull my 7.3 with no problem.

 

I think the blue, might be more of a grey ish, which is pointing to a timing issue. If your rings / valves leaked that bad, the engine would not run well at all.

But the strong diesel smell is really pointing towards timing or injector problems. Both which are cheap to fix.

 

thank you i'll see if i can get the guy to put it back like it was. or if there on marks on it like the 7.3 i can do it myself. just have to find it. thanks again. it probably is more grayish smoke.

 

93 should be a rotory pump. I'd definatly get the pump back to stock first and see if thats the proble if not maybe have the injectors pop tested and pump tested Sorry I'm not very familliar with the bosch ve rotory pumps. If it were a 94-early98 I might be more helpfull.

 

at that age it may be due for a tuneup, the big cummins really benefit from a tuneup reduces smoke and runs better(the old mechanical injected ones) the 5.9 is similar in a lot of ways. generally consists of setting valves, timing, and testing injectors

 

will get the timing set back and we'll see what happens. thanks again.