Engine Drivetrain 2nd Gen Most liked posts in thread: HPFP replacement needed?

  1. Metalman

    Metalman Well-Known Member
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    #3 Metalman, Mar 3, 2015
    Since you don't have a stratified charged engine.... Probably not carbon buildup...

    I could be wrong, but since you don't have the turbo, you may not have the HPFP with the N-12 engine...

    The fuel filter does a great job of filtering the gas... They can get clogged especially if suspect gas has been used... A fuel line test can be performed to verify pressure and flow...
     
  2. Dave.0

    Dave.0 Helix & RMW Powered
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    #2 Dave.0, Mar 3, 2015
    The dealer could tell you if it needs a carbon blasting.
    Also what fuel are you running? Please don't say the cheapest.
     
  3. RichDaBear

    RichDaBear New Member

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    #4 RichDaBear, Mar 3, 2015
    Always +93 octane. And good to know that it may not have a HPFP. I'm just getting to know this car so I can help her out with this. Any other thoughts on what it may be?
     
  4. nkfry

    nkfry New Member
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    #6 nkfry, Mar 3, 2015
    As stated; the N12 doesn't have a HPFP, but it does have a supply pump. It is not direct injection so fuel is still washing the valves (nix the carbon buildup).

    I would start with checking for vacuum leaks, oxygen sensor operation, and proper MAF sensor operation. The P2187 code is for fuel system too lean at idle.

    Plugs are actually due around 100k on the non turbo cars, but we see them failing around 45-60k miles.

    If it is an issue of fuel level, I had one issue awhile ago with my old MKIV Jetta TDI where I would loose fuel pressure and the car would stall due to a small crack in the fuel feed line in the intank fuel pump, so any time the fuel dropped below the crack it began to suck air and caused an issue.
     
  5. eMINIparts

    eMINIparts Well-Known Member
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    #5 eMINIparts, Mar 3, 2015
    Have you changed the plugs? 2010 Base Cooper every 60K
     
  6. RichDaBear

    RichDaBear New Member

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    #7 RichDaBear, Mar 24, 2015
    plugs have been changed. I actually checked for vacuum leaks in the engine bay and couldn't find any. I unplugged the pcv hose and plugged it back in along with the mass air plug and the sputtering went away for about a day then came right back. Really not sure what to do.
     
  7. MCS02

    MCS02 Moderator
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    #8 MCS02, Mar 24, 2015
    Maybe the mass air plug has a short in it, or one of its wires. I had a BMW that had a short in the crank position sensor. It drove me up a wall. Some times it worked some times not.