Rough idle, stalling, black smoke from exhaust.

[ffulton84]

Hi all,

I am new to the forum. I have a 2007 Explorer 4.0L XLT. I need some help it is idling rough and when I come ta a stop.it will stall and not want to start again and loss of power. Also I noticed it has black smoke coming from the exhaust. I thought it might have been the fuel pump and filter so I replaced both. It ran fine for about 2 weeks then started to do it again. So I thought throttle position sensor so I replaced it same issue. I am thinking maybe a intake manifold gasket but not sure. Now I am at a loss and dont know where to turn any advice will be helpful. Thanks in advance.

 

[Rick]

My guess is that the fuel pressure regulator went bad. You may also have a fuel injector that's stuck open.

Have you tried to pull trouble codes yet through the OBDII port?

 

[ffulton84]

It had multiple codes Pcm code, throttle position code. O2 codes, cat codes.

 

[ThunderbirdSport]

X2 on the FPR....and FWIW, running rich will throw an O2 code.

As in a leaky FPR. Dumps excess fuel in the cylinders. As stated, could also be one more bad injectors. FPR is easy enough to change. I'd start there, were I wearing your shoes.