Hi
I run a 3.9 V8 EFI with a hot wire system. When the vehicle is warm it either cuts out, floods or if it doesnt flood it comes pretty close running on anything but 8! After a morning a set of brand new BPR6ES plugs are covered in soot in every cylinder.
Strangely enough the engine fires first time runs well then once it gets warm as above.
As the engine is fitted to a defender I am running an electric fuel pump outside of the tank. The fuel pump is rated to the same pressure as an in tank range rover pump. I am pretty sure it is a fuelling issue and not a spark issue given the state of the plugs.
Anybody got any ideas? I thought it could be the fuel pressure regulator but wasnt sure how to check it? Could it be the airflow meter? If so how can this be checked.
Thanks
John.