black Smoke from Exhaust and Misfire.

Reply Subscribe

Thread Tools

Search this Thread

06-02-2017, 09:23 AM

farooq

Newbie

Thread Starter

Join Date: Jun 2017

Posts: 1

Likes: 0

Received 0 Likes on 0 Posts

Model: Cherokee

black Smoke from Exhaust and Misfire.

I have a jeep Cherokee 2001 XJ 4.0 sport limited, and lately I've been having problem with misfire and a lot of lack of power.
the car struggles to move as it keeps stuttering.
i recently changed the fuel pump to Aeromotive and the throttle body to BBK as i was having this problem before.
But now again its coming back.
Now it even puffs black smoke from the exhaust when i'm on full throttle or even rev it a bit.
please help me with this problem.

Reply Like

06-02-2017, 10:46 AM

nujeepguy

Banned

Join Date: Oct 2016

Posts: 1,553

Likes: 0

Received 4 Likes on 4 Posts

Year: 2000 and 1998

Model: Cherokee

Engine: 4.0

obd2 codes?. sounds rich. o2 sensors. guessing.

Reply Like

06-02-2017, 12:11 PM

fb97xj1

CF Veteran

Join Date: Dec 2015

Location: PA

Posts: 3,038

Likes: 0

Received 333 Likes on 277 Posts

Year: 1997

Model: Cherokee

Engine: 4.0L

Running rich could be the O2 sensors. Could be anything, really. Including the misfire. Running too rich for too long will eventually ruin the cat. So can misfires. When was its last tuneup? Check the fuel pressure, and for any vacuum leaks. And of course, codes.

Also, were the fuel pump and throttle body replaced before of after this started happening?