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1997 4WD 2.7L - No Fuel Pressure After Headgasket Replacement

Discussion in '1st Gen. Tacomas (1995-2004)' started by natecastar, Jan 21, 2025.

  1. Jan 24, 2025 at 6:31 PM
    #61
    O'Silver_Taco

    O'Silver_Taco Well-Known Member

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    Whats the airflow # in grams/sec

    ecm is cutting your fuel almost off the chart......it thinks you're getting way more air than real....

    or its dumping in way too much fuel than needed for some reason....which is doubtful
     
  2. Jan 25, 2025 at 10:17 AM
    #62
    natecastar

    natecastar [OP] Well-Known Member

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    MAF is showing 9.4
    I think that's high last thing I read was that it should be close or match the displacement of the engine so it should be 2.7ish?

    I'll try to find a video for how to clean the MAF properly all I did was shoot it with MAF sensor cleaner.

    Screenshot_20250125-121600.png
     
  3. Jan 25, 2025 at 10:26 AM
    #63
    natecastar

    natecastar [OP] Well-Known Member

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    Warmed up it sits at about 7.0

    Screenshot_20250125-122539.png
     
  4. Jan 25, 2025 at 10:26 AM
    #64
    Dm93

    Dm93 Test Don't Guess

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    The MAF Grams/Second matching engine displacement guide is for the engine being at base hot idle (700-800 RPM), your at 1600.
    Fuel trims look good on that capture though.
     
  5. Jan 25, 2025 at 10:28 AM
    #65
    Dm93

    Dm93 Test Don't Guess

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    You seem to be constant around -20% fuel trim, you didn't happen to replace injectors with some crap ones did you?
     
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  6. Jan 25, 2025 at 11:14 AM
    #66
    natecastar

    natecastar [OP] Well-Known Member

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  7. Jan 25, 2025 at 11:49 AM
    #67
    TnShooter

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  8. Jan 25, 2025 at 11:52 AM
    #68
    natecastar

    natecastar [OP] Well-Known Member

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    Searching the garage for the old ones, seems more and more that I tossed them. I don't know what I'm doing, I figured while I had easy access I might as well swap them out.
     
  9. Jan 25, 2025 at 12:11 PM
    #69
    natecastar

    natecastar [OP] Well-Known Member

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    I found the old ones! I'm going to steal the O Rings and the bug rubber washer seals from the new ones.
     
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  10. Jan 25, 2025 at 12:11 PM
    #70
    Dm93

    Dm93 Test Don't Guess

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  11. Jan 25, 2025 at 2:18 PM
    #71
    natecastar

    natecastar [OP] Well-Known Member

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    Yay! Okay old injectors installed and it goes into Drive and Reverse without stalling. Adding fuel trim images now, idle still high at 1500 and drops to 900 with engine load.

    Now should I be looking for a vacuum leak or is the TPS inaccurate?

    Cold start idle
    Screenshot_20250125-155538.png
    Shifted into Drive
    Screenshot_20250125-155937.png
    Warmed up idle
    Screenshot_20250125-160311.png
     

    Attached Files:

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  12. Jan 25, 2025 at 2:30 PM
    #72
    TnShooter

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    Do the fuel trims start to drop when driving?
    If so, I'd look for a vacuum leak.
     
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  13. Jan 25, 2025 at 2:47 PM
    #73
    natecastar

    natecastar [OP] Well-Known Member

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    Took it around the block a few times, I'm not getting any fuel trim readings on the app. Found out I have no power steering and hear a hissing from the brake booster.

    Image is in idle parked after the drive
    Screenshot_20250125-164613.png
     
  14. Jan 25, 2025 at 2:52 PM
    #74
    TnShooter

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    The booster works off vacuum.
    I'd see if I can fix the hissing.
    Check the hose going to the booster.
     
  15. Jan 25, 2025 at 5:19 PM
    #75
    natecastar

    natecastar [OP] Well-Known Member

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    Hose looks good, removed it capped off an end and pushed air into it held pressure sprayed soapy water no bubblies.
     
  16. Jan 28, 2025 at 10:37 AM
    #76
    natecastar

    natecastar [OP] Well-Known Member

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    Brakes seem to be working better after removing and putting the vacuum hose back on guess it was loose.
    I added power steering fluid and the pump sounds angry with me. What did I do to upset it?
    https://streamable.com/vgslmd

    That sound continued through cold to warm and 5 minutes of driving around the block.
     

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