Question about 2004 Chrysler Voyager

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Constant black smoke whenever accelerator is used?

A constant stream of black smoke is visible no matter how much pressure is applied to the accelerator. Fuel economy is very poor and running at approx 23mpg.

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  • Chrysler Master
  • 5,280 Answers

Too much gas going through the engine-that's why black smoke. That's all your unburned gas going out the exhaust. Have the fuel pressure tested. A failed pressure regulator will pull extra gas into the engine. Pull off the vacuum hose to the regulator. If any evidence of gas in the hose, the regulator's diaphragm has broken and sucking gas through the hose into intake.
If fuel pressure is correct, have a scan done for trouble codes.

Posted on May 08, 2013

  • jon watsham Jun 09, 2013

    Took the car to a diesel specialist who said the problem was down to the egr being sooted up. They cleaned this up and the car drove fine for a couple of days with very little smoke. It then started smoking again. I have since replaced the egr with a new one. No smoke for a couple of days but this one is now sooted up and car is smoking again. What is causing this carbon build up? Ready to ditch this car!!

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A relay is an electronically activated switch. Inside is a coil. When 12v+ is applied to one end of the coil, and a ground is applied to the other end, the coil gets charged, creating a magnetic field. This magnetic field literally moves a metal lever from position A to position B. One end of the lever is attached to constant battery power. When coil not energized, the lever rests in postion A (which in the case of the fuel pump relay is feeding the battery power to an unused terminal). When the coil is activated, the lever moves to position B (which in this case is a terminal connected to your fuel pump wire). Thus, when the relay is activated, 12v+ is being directed from the battery to the fuel pump.

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