2nd Gen R56 Cooper Most liked posts in thread: No Choke On Start Up

Hey Jim; Is the MINI still under factory warranty?
Dr O touched on it as a possible issue with the HPFP. Seems BMW has some issues with them going out. It shows up on some MINI forums and even Peugeot forums as having problems with the HPFP. Your symptoms sound similar. MINI may try to blame it on poor gas, but BMW & MINI seem to have a problem here. One more thing for you to check out.

 

I couldn't answer that question in depth, but should be. I did a web search, and several forums talk about a software up-grade applying to the HPFP. Practically everything on this engine is somehow monitored by the ecu. I would sure bet that fuel pressure is defiantly one of them.
So, do you use top tier gas at the recommended octane?

 

It' looking more like the MINI just didn't like that you put the seafoam in the gas.

 

You may want to try and clear any codes before you take it in to the MINI dealer for service. If not, they may question you about what went into your gas tank. The owners manual specifically states not to add any gas additives. No sense messing up your warranty.

 

I'm thinking you were doing a good thing. But only put it in the PCV hose going to the intake manifold, and not the gas tank. Heck, the MINI will start throwing codes if you don't use the correct octane. It wasn't sure what it was ingesting, so there are safe guards built in to react accordingly.