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Fuel pump replacement, now engine and RPM acting weird. HELP

Discussion in '1st Gen. Tacomas (1995-2004)' started by taco350k, Oct 4, 2011.

  1. Oct 4, 2011 at 1:37 PM
    #1
    taco350k

    taco350k [OP] New Member

    Joined:
    Sep 27, 2011
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    #64214
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    Male
    First Name:
    andy
    milford, oh
    Vehicle:
    95 xtd cab
    I recently had my original fuel pump replaced at around 340-345000 miles on my 1995 toyota tacoma xtd cab, 3.4L 4X4. The original was in there before and for a week it wouldn't start up. now that the fuel pump is replaced it starts up fine but acts weird when its running.
    1.) When I start it up and it gets warmed up, it Idles right at 2,000 RPM, before it idled around 1,000 or 1250
    2.) No problem when im actually moving forward, but when I'm in neutral and applying the brakes and above 20MPH, it revs up and down between 1,250 RPM and 2,000 RPM and goes back and fourth up and down until exactly when I hit 20 MPH, then it jumps back up to 2,000 RPM and stays there (just like when im at an idle stop). If I let off the brakes though while I'm above 20MPH and still in neutral, it stops hovering between 1250 and 2000, and stays right at 2,000 just like when its idling, but as soon as i touch the brakes and am over 20MPH it will jump up and down.
    3.) I dont know what it is and really would like to get it fixed because I plan on keeping my truck of course, its just the gas mileage has dropped to somewhere around 14-16 MPG (normally 21 or 22).

    PLEASE HELP. anyone who has had to change their fuel pump or has any idea what this problem is (electrical, fuel pump regulator etc.) or what I can do please let me know. I would GREATLY appreciate it.

    All the best
     
  2. Oct 4, 2011 at 7:33 PM
    #2
    hayabusa3303

    hayabusa3303 Well-Known Member

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    Mike
    florence sc
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    95.5 taco 4x4
    ARB bumper, warn 9.5 winch. carbon fiber hood. Leer top with thule racks and MOAB from thule. Electric fans, blue sea fuse block, Sony dvd Head unit, Xm tuner and HD tuner. New carpet and new racing seats. ( other half doesnt like them i think). Nwor springs and adjustable coil overs. Sky jacker rear shocks. Slot and drilled rotors. Engine Titanium ceramic coated headers, no cat, jba cat back. URD Rear Sensor Simulator. Leds all around and inside cab and HID H4 hi/lo beams.
    Check you IAC with a meter make sure its in check. Iac controls your idle.

    Did you replace your fuel filter when you changed your pump?
     
  3. Oct 4, 2011 at 7:39 PM
    #3
    tacobell007

    tacobell007 Does that have the v6?

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    Drew
    Westfield, MA
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    06 Regular Cab Lifted
    Eibach springs, OME Dakars, adjustable Bilstien 5100's up front, Icon ext travel rear shocks, Kenwood in-dash nav receiver, Kicker 10 inch sub in a ported truck box, Kenwood 350 watt amp, stickers, Better Built toolbox, LED tool box lights, 35% tint, Flowmaster Super 44 muffler, 33x12.5x17 General Grabber AT2, Fuel Off-Road Trophy d551 in 17x8.5, BHLM, white corner marker bulbs, color matched front grille, custom satoshi grille mod with matching Toyota badge, aFe Pro Dry-S drop in filter, diff breather mod, new frame from recall, SOS concepts front plate, SOS concepts rear plate with swing out and full size spare, SOS bolt-on sliders with kickout, 20" LED bar on main hoop, flush mount pods in rear plate bumper for aux reverse lights
    Might be running a little lean? :notsure: that would cause it to have a higher idle I believe.
     
  4. Oct 4, 2011 at 10:29 PM
    #4
    mikesdoublecab

    mikesdoublecab LT Chase Truck

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    Mohawk Mike
    Glendale, CA
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    Engage Offroad long travel front and rear with some fat tires.

    x2...

    i recently had my fuel pump go bad and replaced... after that, it started running badly, check engine light kept coming on, so i took it to my mechanic... turned out my IAC sensor went bad too, so swapped it out and it ran good as new...
     
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