Black smoke from exhaust
02-05-2013, 02:23 PM
#1
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Black smoke from exhaust
Hey guys new problem I replaced my injectors to some better ones I got from the junkyard and now it's running super rich my last injectors caused my car to run really rough and caused the car to shake while driving ad it had diff kind of injectors on at the same time that's why I replaced them and now it spits out black smoke but while driving it has a lot of torque . Plz help
02-05-2013, 02:50 PM
#2
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
What kind of injectors? Did you change Your fuel rail and the FPR?
Have you done any other troubleshooting like the MAP sensor vacuum hose?
Have you done any other troubleshooting like the MAP sensor vacuum hose?
02-05-2013, 03:14 PM
#3
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
02-05-2013, 03:35 PM
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Go poke your noggin under the hood and look at it. Runs from the throttle body to the MAP sensor on the firewall. You can't remove and replace the injectors without disturbing it.
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02-05-2013, 04:18 PM
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Year: 1990
Model: Cherokee
Engine: 4.0
And wish I knew how to test the FPR, but I don't sorry.
Last edited by PNWjeeper; 02-05-2013 at 04:25 PM.
02-05-2013, 05:17 PM
#11
Herp Derp Jerp
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
MAP sensor testing on this page: http://www.lunghd.com/Tech_Articles/...iagnostics.htm
The unit must have GOOD vacuum and all fittings need to be clean and not cracked. You need to check the MAP.
Fuel Pressure Regulator must be upgraded to accomodate the Bosch *703 injectors. Since you haven't mentioned what injectors you used then we can't really help any further than that.
A busted fuel pressure regulator will be visibly wet if you remove the vacuum line from it. This indicates that the membrane has ruptured.
The unit must have GOOD vacuum and all fittings need to be clean and not cracked. You need to check the MAP.
Fuel Pressure Regulator must be upgraded to accomodate the Bosch *703 injectors. Since you haven't mentioned what injectors you used then we can't really help any further than that.
A busted fuel pressure regulator will be visibly wet if you remove the vacuum line from it. This indicates that the membrane has ruptured.
02-05-2013, 05:19 PM
#12
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Year: 1990
Model: Cherokee (XJ)
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What changed? The injectors. Get some crappy ones?
02-05-2013, 05:36 PM
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0