Running Rich

[SHIFT_240sx]

so yeah i noticed today my car was boggng pretty bad so i brought it home and checked my plugs, black as night, so i changed my plugs and went for a test drive, same problem.

i noticed that black puffs of smoke were coming out of the tailpipe, but i remember this happening when i tried to plug one of the vac lines coming from the throttle body to the carbon canister, it had the same exact symptoms until i reattached the vac line and everything went back to normal, then one time i gapped my plugs wrong and the same symptoms showed up again.

recently, i had run the car for about a day or two with my air hose that goes from the TB to the cold pipe half off the TB and i wasnt boosting properly until i figured out the problem and put the hose back on properly. After this the bogging problem is back, my air hose has some cuts at the bottom so maybe its a vac leak again but i dont know.

im thinking about changing the fuel filter and seeing what that does, anyone have any suggestions?

[SHIFT_240sx]

ok so i tried resetting the ecu and it works alot better, when i first run the car it runs perfectly fine and boosts properly, but when i have run the car for a long time after awhile the problem comes back, anyone know what this could be?

[sydwayz315]

if it's only running rich now when the engine warms up that a bad coolant temp sensor.

[IanS]

Check the voltage on your coolant temp sensor.

Do you have any ECU codes?

Have you checked for boost/vacuum leaks?