Hello,I had new plugs put in when the engine was changed, and I'm told they are fouled and needed cleaning already. I'm just trying to pinpoint the problem, I'm currently fighting with the guy I got the engine off, but I'm starting to wonder if it is a fuel problem after all.
Yes it could be a fuelling problem.
The emissions report means one (or more) of the following:-
- there is too much fuel going in
- there is not enough air going in
- the mixture isn't being combusted properly
- the cat is knackered.
If number 1 it could be the injector(s) leaking too much fuel in, so that's why the plugs will be fouled, and they will be again now!
But be aware that too much neat fuel for too long will badly affect the lambda probe and the cat, so it's difficult to separate cause and effect.