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Black smoke

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Old 02-02-2011, 02:45 PM
5 RAMS
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Default Black smoke

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
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Old 02-02-2011, 02:47 PM
dodgeboy1979
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are you getting any codes?. My buddies truck did this and it was his preCat o2 sensor.
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Old 02-02-2011, 02:57 PM
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Is it a diesel?

Running rich. PreCat O2, or engine coolant temp sensor.
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Old 02-02-2011, 03:30 PM
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Thanks guys I will check that
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Old 02-02-2011, 05:04 PM
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black smoke means unburned fuel....
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Old 02-02-2011, 06:01 PM
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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???
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Old 02-02-2011, 06:42 PM
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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......
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Old 02-02-2011, 07:13 PM
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Thanks, How can I check the injectors?
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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......
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Old 02-02-2011, 07:59 PM
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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.
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Old 02-02-2011, 10:54 PM
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my 5.2 was running rich and could smell gas, i changes the coolant temp sensor the runnin rich part went away
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