1993 automatic
1993 automatic
this might sound stupid but i have a 93 cummins auto and we turned it up and it won't smoke. we really don't want the smoke but just thought that was odd. we rotated the fuel pin turned the starwheel, and turned the smoke screw,(i did the same thing to my 90 5 speed and it smokes like crazy). i was wondering maybe it wasn't building boost or something. could you guys tell me anything, is that how its supposed to be or is something wrong? thanks
Diesel Enthusiast
Joined: Oct 2010
Posts: 279
Likes: 28
From: winston, oregon
turn the fuel screw in to near runaway and see what happens. be careful and do some research first though. read the sticky in the 1st gen aftermarket forum 
Last edited by crewcab59; Mar 2, 2011 at 05:22 PM.
The intercooled models have smaller injectors than the non-IC'd ones, so that's part of it. Also, you're running an IC. The cooler the intake air, the better your fuel is going to burn. A more efficient burn means less smoke.
Like Crewcab59 said, add more fuel with your fuel screw. But be real careful not to have it run away on you. And before you go real crazy, do yourself and your engine a favor by throwing a pyrometer at it.
Like Crewcab59 said, add more fuel with your fuel screw. But be real careful not to have it run away on you. And before you go real crazy, do yourself and your engine a favor by throwing a pyrometer at it.
Diesel Enthusiast
Joined: Jan 2010
Posts: 337
Likes: 12
From: Rockport Texas
x2 on the pyro my firend doesnt know much about diesels and he turned his pump up to much with out gauges and he was fallowing me home one night when we both had a load of hay and when we got to the house and opened the hood his exhaust manifold was cherry red and all warped it was pretty crazy sooo gauges are always a good idea
Diesel Wrench
Joined: Apr 2010
Posts: 510
Likes: 32
From: Texas Panhandle
x2 on the pyro my firend doesnt know much about diesels and he turned his pump up to much with out gauges and he was fallowing me home one night when we both had a load of hay and when we got to the house and opened the hood his exhaust manifold was cherry red and all warped it was pretty crazy sooo gauges are always a good idea
I did see an article that mentioned something about '93's having smaller injectors than the rest. It seems like the '93's were an oddball batch. The odo, ignition key, and the transmission tunnel are all different on mine than the other years Ive owned.
ya my 90 smokes like crazy when i want it to. the 93 is my dads and he might be getting injectors but i need to talk him into getting gauges first. thanks for all the replies and help.
