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2nd Gen Ram Tech 1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

Black smoke

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Old 02-02-2011, 01:45 PM
5 RAMS 5 RAMS is offline
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Default Black smoke

My dodge RAM 97, 5.9 magnum is blowing a lot of black smoke why? any ideas, itĘs 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, 01:47 PM
dodgeboy1979 dodgeboy1979 is offline
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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, 01:57 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, 02:30 PM
5 RAMS 5 RAMS is offline
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Thanks guys I will check that
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Old 02-02-2011, 04:04 PM
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dipsherry dipsherry is offline
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black smoke means unburned fuel....
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Old 02-02-2011, 05:01 PM
5 RAMS 5 RAMS is offline
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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, 05:42 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, 06:13 PM
5 RAMS 5 RAMS is offline
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Thanks, How can I check the injectors?
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Originally Posted by HeyYou View Post
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, 06:59 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, 09:54 PM
InnerCityHillBilly InnerCityHillBilly is offline
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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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Old 02-02-2011, 09:54 PM
 
 
 
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