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Black smoke

Tiny
KYLE BAUGH
  • MEMBER
  • 1999 JEEP CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 300,000 MILES
Hard acceleration cause stutter and puffs black smoke. Also have rough idle at times.
Sunday, December 31st, 2017 AT 2:28 PM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening

Black smoke could be coming from injectors. If one or more is delivering more fuel than needed, it will run rich.

Have you ever had the injectors cleaned? Shops offer injector service where they disable the fuel pump and run a solution through the fuel rail that breaks up all the carbon deposits and makes them work much better.

Roy
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Sunday, December 31st, 2017 AT 3:02 PM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
If you have too much fuel pressure, over 55 psi, maybe due to a kink in the fuel line, then that also could cause the black smoke and running too rich.
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Sunday, December 31st, 2017 AT 3:11 PM

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