i have a 99 dodge...im new on here but i figured u all could help me...i just replaced the throttle position and mass air flow sensors...it idles weird whenever its settin still for like 5 mins....then whenever u stomp it going down the road it blows black smoke...once it gets past 3 grand it clears up...any ideas? thanks a lot!!! i love the forum!

 

MAF sensor??? Maybe you mean MAP (manifold absolute pressure)??

How many miles on it? Service engine light on? Could be a bad O2 sensor as well.... or a sticking injector......

 

its got 70 thousand on a new motor. just put it in. yea it is..ive cleared the codes on it but didnt find much of anything important...just got hot once

 

welll not new but new to me...the truck has 119

 

What do the plugs look like? What codes was it giving?

Black smoke is running rich. (but, you knew that.... ) I would look long and hard at the O2 sensor first, and then start looking at injectors.

 

well if it was spark plugs then it wouldnt run good sometimes and then it run like crap at other times ya know? plus it doesnt shake very bad in over drive so i think ur rite about it bein the o2 sensor...haha i hope thats all it is aleast! but yea its running very rich! i got a superchip programmer set on tow to so that helps it smoke lol

 

running that rich, plugs might be fouled..... worth looking at, but yeah, I don't think that is the whole problem.

Have you tried putting it back to the stock tune? and see if the problem goes away?

 

black smoke can also mean you are burning oil. If the valve seals are leaky, it will allow oil to seep into the CCs when parked, and when you drive it, you will see black smoke when you get on it then it will clear up.

But that does not seem right for a new engine. However you did run it hot. I owned a camaro, and i ran the car hot ONCE. I ended up having severe blow by and it caused the TC cover, oil pan, and rear main seal to leak oil. The oil would touch the headers and make black smoke every time i got on the gas.

 

well yea ur both right but if it was burning any oil then it would be blueish black..i know its not blown or the head gasket but i think its prolly the 02 sensor prolly atleast i hope so...its my baby lol i got all my time and money in it...im sure u guys know what i mean lol but i had the motor in another truck and she ran like a champ...no problems at all