HPFP help!

Discussion in 'Corksport' started by Mateo, Mar 12, 2020.

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  1. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Lucky for you @Enki wrote most of the answers to hpfp problems on msf. Take his advice
     
    Easter Bunny, via a mobile device, Mar 20, 2020
    #21
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  2. SharksInSpace

    SharksInSpace Planets and shit. Silver Member

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    Not throwing any codes?
     
  3. Enki

    Enki Motorhead Platinum Member

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    Yeah but...
    [​IMG]
     
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  4. Awafrican

    Awafrican Moderator Gold Member

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    Haha oh redline fuck that guy.

    But yes OP there's alot of corporate knowledge here from people that created those posts just like Easter Bunny said. Keep asking and posting results and MSO will get you running.
     
    Awafrican, via a mobile device, Mar 20, 2020
    #24
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  5. Mateo

    Mateo cap'n Greenie Member

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    no codes, but been checking for them pretty frequently. my relief valve test got up to 1800 before slowly dropping, I've seen it's supposed to be at 1850 before that happens. would you know if this is an issue with my rv?
     
    Mateo, via a mobile device, Mar 20, 2020
    #25
  6. Enki

    Enki Motorhead Platinum Member

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    Lol no
     
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  7. Mateo

    Mateo cap'n Greenie Member

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    how about my pressure dropping down to 270-300 on deceleration when fully letting off the throttle in gear? pardon my mechanical ignorance :(
    also my cold in tank pressure has seemed low now. around 48-54psi
     
    Last edited: Mar 20, 2020
    Mateo, via a mobile device, Mar 20, 2020
    #27
  8. Enki

    Enki Motorhead Platinum Member

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    The HPFP will work with 10 PSI feeding it. The engine doesn't need high fuel pressure when the injectors aren't even firing (off throttle, engine braking).

    The fuel pressure is modulated based on expected flow and minimum (yes, there's a certain amount of time the injectors have to stay open due to physics) injection time. If the pressure is too high the car will run rich, and from the factory that would mean a fine from the EPA due to emissions. The only time you really need to watch rail pressure is under load and boost, in which case you want over 1600 PSI minimum. 1400 PSI is getting dangerous ish.

    As a side note, I've personally driven with a crapped out HPFP two hours between cities; this was with only 50-60 PSI at the rail (not recommended, but doable in an emergency).
     
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  9. JohnnyTightlips

    JohnnyTightlips Motorhead Silver Member

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    Same, my PRV was bad and I could only build like 60 psi but I was able to drive it as long as I did not get deep into the throttle and start to boost. I drove it to work like that for two days before I figured it out.
     
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  10. Mateo

    Mateo cap'n Greenie Member

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    this definitely gives me peace of mind about driving it to and from work which I don't really have a choice on lol until tomorrow morning at least when I can pull the pump and try to clean as best as I can without pulling the internals out for the sake of avoiding another fuck up :shakehead:
     
    Mateo, via a mobile device, Mar 20, 2020
    #30
  11. Enki

    Enki Motorhead Platinum Member

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    You will be slow with no fuel pressure. Very, very light throttle, keep it under 3k rpm and you'll get there.
     
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  12. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Yea fuck Canadians
     
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  13. Awafrican

    Awafrican Moderator Gold Member

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    Woah Woah don't throw us all out because of one bad egg. If that were the case the world would right off 'murica
     
    Awafrican, via a mobile device, Mar 20, 2020
    #33
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  14. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Just abandon the queen, get over yourselves and your low value Canadian dollar and apply for statehood already.
     
    Easter Bunny, via a mobile device, Mar 21, 2020
    #34
  15. Awafrican

    Awafrican Moderator Gold Member

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    Little off topic from poor OPs thread now aren't we? Leaving the common wealth is really doesn't have a benefit, nor does it really have a benefit IMO. However joining the USA? Not a chance, I immigranted once I'll do it again if that ever happens this time away from north north america. While I like being neighbors to the USA and we seriously need to fix our economy as we used to almost be on par with the USD doesn't mean I or probably the majority of Canadians want to live there.
     
    Awafrican, via a mobile device, Mar 21, 2020
    #35
  16. Mateo

    Mateo cap'n Greenie Member

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    so going over my original pump parts that were left over from the local shop when they tore it apart to extract my corksport internals and I found that the used pump I bought to get a new screw nut (supposedly off a cx7) had autotech internals in it :eusa_doh:

    guess it doesn't really make a difference unless my CS internals are failing and thats the reason for my pressure dropping randomly.
    on another note, I noticed that the electrical connection on top of my spill valve doesn't click into place like my original one did. should I swap the spill valve off my now parts pump?can the parts can be interchanged? thanks guys!
     
    Last edited: Mar 21, 2020
    Mateo, via a mobile device, Mar 21, 2020
    #36
  17. JohnnyTightlips

    JohnnyTightlips Motorhead Silver Member

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    Pretty much everyone who owns these cars has a broken spill valve plug just get a plastic tie and tie it on there.
     
    JohnnyTightlips, via a mobile device, Mar 21, 2020
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  18. Mateo

    Mateo cap'n Greenie Member

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    after cleaning up pump and reinstalling the car is feeling better but my idling ltft are fluctuating. sometimes around -10 sometimes -13.5. do these numbers sound off? under load I've been around +0.6
     
    Mateo, via a mobile device, Mar 21, 2020
    #38
  19. Enki

    Enki Motorhead Platinum Member

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    Don't check idle trims until car is hot.

    Edit:
    Also, fuel trims at idle have little to nothing to do with HPFP issues, pretty much ever.
     
  20. Mauro_Penguin

    Mauro_Penguin Punk in Drublic. #BlackLivesMatter Motorhead Platinum Member

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    Your rich LTFT's could be from some kind of boost leak.

    Without any codes, it's really a matter of checking/testing things.

    How many miles are on your HPFP now?
     
    Mauro_Penguin, via a mobile device, Mar 22, 2020
    #40
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