Black smoke from exhaust,no idle in warm temps-97 Nissan 2WD 2.4L

- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection

Does it blow black smoke as the temp rises? Very comon to have a faulty coolant temp sensor, and it trys to run so rich that it can't.

Try replacing the EGR valve .

You have fuel in you cylinder.....Check your carburetor. It might need adjustments. Also, check for faulty fuel pump, injector, engine electronic. Also, check your fluids...all of them.

Hunnybunny

I just had a similar situation. The truck would run fine and then the Service Engine Soon light would start blinking and the truck would go into "limp" mode. It would eventually stall. Strangley though, if I turned the key over and then restarted it, it would start right up and run again. It ended up being the IPDM (Intelligent Power Distribution Module) that was bad. It cost me $520 to replace it.

Is the engine at running temperature when it starts running rough? And when it is cool does it run fine until it warms up?

it soubds like you have a vacum leak problem listen for a "his" with the engine running. you may want to take apiece of hose @2-3ft long put one end at you ear and probe arround the top of the engine arrount the intake manafold and any hoses when you find the his find wher it goes and replace repair the hose. it may also be your pcvvalve thst is stuck it willcome out of the top of your valve cover and plug right the intake hose right before the throttle body

sounds like to me your motor in your fan is going. that is y your 4 runner ran nice and cool when its cooler outside. the hotter it is outside the harder your fan will work

Sounds to me like you have a bad coolant temperature sensor. Or a bad o2 sensor. Leaning towards the coolant temp. sensor. I hope that I helped. Best wishes.

MASS AIRFLOW SENSOR THERE ABOUT £6O WHEN THEY PLAY UP THE CAR WONT IDLE PROPERLY AND POOR RUNNING/HESITATES BEFORE IT PICKS UP AGAIN, NOT SURE ON THE BLACK SMOKE THOUGH, GOOD LUCK .