I got a 99 ram 1500 with a 5.9 an I jus got the exhaust done an now the insides of the exhaust Is black one of my friends said it was running to rich how do I fix it?

 

did you change the 02 sensors when you replaced exhaust? did you reset the computer afterwards for the 02 to re learn te new exhaust flow?

 

the inside of the pipe being black is pretty normal. i haven't seen a white pipe in 30 years.

but if you have black smoke, or rich/gassy smell, or terrible MPG, then replace the front (pre-cat) O2 sensor.

if your exhaust work removed the front O2 sensor, then you need to put it back in, as its a critical piece in a computer controlled vehicle.

 

Wouldn't the computer pick up a bad 02 sensor

 

Not always, plus the O2 sensors should be changed ~65K miles.

 

Cause my engine light is on but the only code it shows is for the coolant sensor it says high circuit

 

Need to fix that then. PCM bases a LOT of its calcs on engine temp. If it is getting a wrong reading..... you get wrong results.

 

I'll try an fix that today an see wat that does

 

+1... If the PCM is disregarding info from the ECT (as it would if reference voltage were too high) then it defers to set tables.... kind of a "limp in, shtty gas milage mode"

Regardless... exhaust pipes are always going to look black inside; if this was your friend's only basis for the assumption that you're running rich, he doesn't know what he's talking about.

 

All that black is what made it through your cat and muffler, and thats the reason they are there, any vehicle will have black inside the pipes