2000 Dodge Dakota Rough Idle Black Smoke

DODGE DAKOTA
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JJEG
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Dodge Dakota, year 2000,20k miles 4.7litre
Living is small town rural Alaska with no repair shops so hope you can help..The truck starts with a puff of black smoke and runs ok until it warms up then things go bad...sounds rough and doesn't want to idle and will stop and not easy to restart. Black smoke continues from this point.
jjeg
Apr 9, 2007 at 10:49 AM
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2CARPRO JACK
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Either an injector is sticking or maybe the fuel pressure regulator (if equipped) is blown. Use a meter and test resistance across all the injectors , see if one is out of range from the others
Apr 10, 2007 at 1:17 AM
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PEPPERMRJ
  • ✓Experienced Mechanic
  • 1,158 POSTS
Black smoke usually means a rich conditions. I would think that the fuel pressure is too high or that you have a leaky injector/s. Test the pressure at the rail. Try running some injector cleaner thru a tank of fuel or two. I like chevron with techron myself.

Good luck and let us know. :)
peppermj
Apr 10, 2007 at 1:18 AM

Suggested Repair

Check for a rich condition: compare injector resistance and look for a sticking or leaking injector, test fuel pressure at the rail, and inspect the fuel pressure regulator if equipped. Injector cleaner in a tank or two of fuel may also help.

Conversation Summary

A 2000 Dodge Dakota 4.7 starts with a puff of black smoke, runs acceptably until warm, then idles roughly, stalls, is hard to restart, and continues to smoke black. Experts attribute this to a rich mixture from a sticking or leaking injector, high fuel pressure, or a failed fuel pressure regulator, and recommend comparing injector resistance, testing rail pressure, and trying injector cleaner.

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