R32 gts-t runnin rich need help

[bgosseR32]

Hello all it looks like my car is running rich aka black soot on my bumper after about a week of driving
My car hesitates a little when I first start it up in the morning and the first run is a little hesitant
After the first run everything seems fine
Other then the soot
Any tips / fixes to this problem ???
Thanks in advance

[Skym]

Hello all it looks like my car is running rich aka black soot on my bumper after about a week of driving

Change o2 sensor, as it can become lazy and make ECU make engine stay rich for longer. Symptoms are running rich, pops flames from exhaust (popping sound from exhaust). It should be checked, replaced every 40,000km-60,000km.

My car hesitates a little when I first start it up in the morning and the first run is a little hesitant
After the first run everything seems fine

That probably will be the start up tables (too rich, etc) and ECU pulling ignition timing, etc while driving. If engine has mods the ignition timing, fueling will be out. Fix is to retune ECU.

If does it when engine is warm, check TPS voltage and replace TPS if necessary (hesitation due to engine running suddenly lean when throttle body suddenly opens, which TPS was designed to prevent).

[bgosseR32]

Thanks a lot I was reading up and i also found that the o2 sensor was the problem once again thanks alot