My dodge RAM 97, 5.9 magnum is blowing a lot of black smoke why? any ideas, it¨s been that way scince i bought it, but today it got worse, looks like a diesel!!
Thanks for the help

 

are you getting any codes?. My buddies truck did this and it was his preCat o2 sensor.

 

Is it a diesel?

Running rich. PreCat O2, or engine coolant temp sensor.

 

Thanks guys I will check that

 

black smoke means unburned fuel....

 

It has no codes, the O2 sensor is OK.
When I bought this truck about a month ago I put new spark plugs, air filter, coil, and cleaned the injectors, cause it was hard to start, right now is still sometimes hard to start (is the same cold or warm) and today blowin some black smoke, could it be the distribuitor???

 

No. That is unburned fuel you are seeing. You either have an ECT sensor that has failed, (and won't set a code....) or, injectors that are hanging open......

 

Thanks, How can I check the injectors?

 

Put a fuel pressure gauge on it. Turn the key on, (might have to cycle it a couple times) to build fuel pressure. Watch how fast it bleeds off after the pump stops. If pressure drops quickly.... you have a problem. At that point, you would need to pull the fuel rail with the injectors to see just which ones were bleeding down. (or, if it was just a pump check valve issue....)

If it isn't the injectors, I would be looking REALLY hard at the coolant temp sensor.

 

my 5.2 was running rich and could smell gas, i changes the coolant temp sensor the runnin rich part went away