I just bought another dodge cummins 2001 bone stock with 78k blows bad black smoke with no throttle down hill. Any idea what could be wrong?

 

Could be a number of things.. So just sitting there idling in park it's blowing a lot of black smoke? turbo have any play in the shaft? Blown/ damaged intercooler boots? Is it running rough or normal?

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It does not smoke at idle. No major blow by. But When I drive it for a little while it smokes really bad. Seems to run good though and builds boost pretty quick. Checked turbo it has a little tiny bit of shaft play. Boots looked ok. Guy I got it from says he accidentally ran gasoline through it somehow.

 

Check for codes. You might have injector pumpproblems ?

 

I haven't even thought of that ill definitely look into it for sure. Would there be anything else that the gasoline could have ruined on the truck to cause it to smoke.. even if it isn't is the gasoline that caused the problems?

 

Truck has absolutely no codes logged at all. I'm stumped I haven't had this problem with any of the dodges I have owned.

 

Injector hanging open maybe? Run a heavy dose of power service and see what happens.

 

A lot of fuel will produce black smoke when engine braking...

I'm thinking injector/ vp problem....

 

alright thanks for the help greatly appreciated

 

Broncboy,
I have no idea if your VP44 (injector pump) is your problem or not but they aren't cheap so that isn't something you want to diagnose by throwing a new pump at the problem. The link below will take you to a page with the best VP44 diagnostic procedures you are going to find.

http://www.bluechipdiesel.com/vp44diagnostichelp.html

 

Good advice from Tallguy67...he's actually 6'-7" tall!!


Welcome to the site, my post was a suggestion to investigate, by the way, not a sure fire cure!