Question about 2004 Dodge Ram 1500

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Won't start, back fires, engine knocks, spitting black smoke. can't hook up to computer because it wont start and getting a new battery will reset the computer in the truck.

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I dont need to be started to hook up computer. also something that bad will show codes even after changing battery if you crank it a bit.sounds like a cam or crank sensor problem though or engine got wet

Posted on Apr 29, 2010

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timing issue sound correct

pull off the front cover to verify cam/crank alignment marks?

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Exactly same prob.


99% of the time we mechanics tend to trust computer of what it tells us when it come to engine diagnostic; i hate to not agree with VW mech which he pull the code and state is knock sensor although I have ran into computer spit out many wrong code and still does not fix the problem however I go ahead and replace it any way. Now if that does not fix the issue after replacing with new parts, I then would go back and plug computer back in to see what other code it would spit out. my opinion, I would also have your air-mass flow sensor check, some people don't realized throttle control/airmass flow sensor also link into the ECU compute between the revolution sensor of the transmission telling computer is time to shift. faulty air-mass sensor can also cause it to bogs or not picking up speed giving a false sense the transmission is not working correctly. you can go to auto zone and use their computer for free if you need to re-pull the code after replacing the knock sensor.

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Your engine is toast. The black smoke indicates more than likely your valve seals are leaking oil into the combustion chamber or the piston rings are shot.

Time for a new vehicle...

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Runs fine when cold , when wamed up , spits and sputters, at low rpm. blows black smoke, wont ldle?


Sounds like an oxygen sensor problem. O2 sensors have to be warmed up to around 900 degrees to properly operate, so until they're up to temperature, the ECU ignores them and fuels the engine on preprogrammed fueling maps stored in the ECU. Once they're up to operating temperature, they provide feedback to the computer for properly fueling the engine. Blowing black smoke indicates a rich condition (excessive fuel), which usually is the result when and oxygen sensor is defective. The computer realizes the O2 sensor isn't working right and goes to a rich-fueling map for the engine. Rich running is not damaging, other than it can foul spark plugs and (if untreated for a long enough period) could clog the catalytic converter. This is better than a lean condition (too little fuel) which superheats the cylinders and causes them to detonate, which can fatally damage the engine. I would change out the primary oxygen sensors and see if your problems go away. You may need to get new spark plugs as well, especially if this has been going on for awhile - they may be carbon-covered and not firing efficiently.

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