Please help! Engine Misfiring once warm

[RBOOLL99]

Hey guys,

I've owned my RS200 Red Bull for 5 years now and never had any issues in regards to the motor. The car has 85,000kms and had the spark plugs changed around 10,000km ago. All of a sudden its developed a bad misfiring issue. The misfiring only beings to occur once the engine is warm (about 3-4 mins of driving) but once it its warm it will misfire quite a bit under acceleration and moderately at idle. Any suggestions on what this could be? My initial thought was plugs but they're practically new, maybe a sensor or something? Any help would be great! Thanks

 

[bedoef]

Do you have an RS Tuner or access to a Clip? Might be the O2 sensor going bad.

 

[Foxspeed]

check which cylinder is misfiring then swap coils and see if the misfire moves...also check injectors as a possible issue

 

[wootwoot]

Agree with above. Check that cylinder four is not flooded from the washer jets leaking which is common.
It falls into the spark plug hole and stuffs it.

Also make sure the MAP sensor is firmly pushed down.

 

[RBOOLL99]

Just solved the issue. Ended up being an injector, worked fine from a cold start but once exposed to heat the internal electricals would malfunction, thus the misfire. Thanks for the help guys!