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Thread: Fuel Pump Hot Wired; Bye Bye Knock!

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    Fuel Pump Hot Wired; Bye Bye Knock!

    I just got done hot wiring my stock fuel pump today, and my engine knocking is finally gone! I'm really psyched.

    Original Symptoms:

    -My logger saw my fuel trims as Low: ~82(idle) ~90(driving), Mid: 110, High: Just under 120.
    -Occasional sputtering/hesitation under load
    -knock spiking to 20 counts now and again under load

    First: I checked for intake leaks despite the fuel trims looking like the opposite of a leak condition. No change.

    Second: New fuel pressure regulator:
    -Trims were fixed! Low remained the same, mid: ~108, High: 102.
    -Knock still remained, hesitation still remained.

    Third: I did the hot wire with the help of a friend, drove it around for about a half hour and got nothing more than a rare 1 count of knock. Problem solved! Throttle response seems faster now and the ride is overall smoother with no more hesitation.
    Fuel trims are now
    low: same as original at 82 but now does not fluctuate higher while driving, Mid: 96, High: 105


    I'm now contemplating re-installing the EGR system because I believe I heard this may raise and keep level my low fuel trim.

    Man, I can't wait to turn my boost up! I don't even remember what stock boost feels like. The car already seems quick and the boost is only at waste gate pressure.
    . 1992 VR4 - Java Black Pearl paint (2004 STI) with combo '92/'96/'99 custom front end .
    . Fittipaldi Force or 5Zigen FNO1-RC wheels . Cianci rear strut bar . K&N intake . DNP pre-turbo hard pipes . DNP hard intercooler pipe kit . Greddy Type RS BOV (recirc) . HKS EVC Black Limited boost controller . Vacuum reduction with all silicone pluming . EGR block off plates . Hot wired fuel pump . AEM AFPR @the rail with Robbeck adapter . Fuel rail loop . Tanabe knockoff down pipe . No cats . Single Turbo Flamer full 3" cat back . RPS Max pressure plate with street disk . Seattle92VR4 solid motor mounts . '99 Lifters . R1 Concepts slotted rotors . Supercar Engineering brake caliper stiffening bolts . HHH data logging . Red Line fluids .

  2. #2
    JNS Engineering verified Feedback Score 1 (100%) Jimvr4's Avatar
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    Good to hear! I've been having a similar problem that I first noticed when logging a dyno session. If you don't mind, check out my logs posted in the Spyder on the Dyno thread and let me know what you think.

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    JNS Engineering verified Feedback Score 1 (100%) Jimvr4's Avatar
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    Quote Originally Posted by Rom3BreaK View Post
    I'm now contemplating re-installing the EGR system because I believe I heard this may raise and keep level my low fuel trim.
    Found this reference which may shed more light.

    http://www.stealth316.com/misc/obdii_fuel_trim.pdf

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    -BOOSTTD- verified Feedback Score 2 (100%) mh3kgt's Avatar
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    I plan to hotwire my pump hopefully this weekend if weather prevails, I've got a bunch of rewiring to do since I keep draining batteries somehow and hotwire is on the list. Hopefully it will quell my random knock issue as well.

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