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P0172 code after new injectors

Discussion in '1st Gen. Tacomas (1995-2004)' started by NicoTacoShop, Apr 24, 2019.

  1. Apr 24, 2019 at 1:48 PM
    #1
    NicoTacoShop

    NicoTacoShop [OP] Member

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    1998 2.4l manual Tacoma ext cab 239k

    i just installed new injectors and am planning on getting old ones cleaned. After installation I drove my truck around for a while and code p0172 came up. I have a manual transmission and when I accelerate from a stop the truck doesn’t want to accelerate until i gas it More than I have to. No visible leaks and double checked connections. Before my injectors were replaced I would have occasional times where the truck would stutter for a brief moment then would run OK. Now at idle the truck has short misses. Any thought on what it could be? I didn’t need get OEM injectors. New ones were recommended by a user on a forum. Here are the ones in my truck:
    https://www.ebay.com/ulk/itm/121700898313
    Any help would be great. Thank you!
     
  2. Apr 24, 2019 at 2:27 PM
    #2
    FirstTimeFirstGen

    FirstTimeFirstGen Less active than most

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    Not enough to have a build thread.
    Given the P0172, I'd say you have an over fueling injector. If it was a misfire, youd have a misfire or lean code since the oxygen sensor just checks for oxygen. When a cylinder misfires, it has excess oxygen pumped into the exhaust, thus creating what the oxygen sensor perceives as a lean condition. Unless you were chasing the p0172 (or another driveability symptom) to begin with. Then we would need more info to help you chase your original concern. You're air filter is clean and you dont have anything blocking your intake from replacing the injectors, right? It could also be the oxygen sensor too.




    Edit: Air Fuel Ratio Sensor. Sorry, Toyota specific lingo
     
  3. Apr 24, 2019 at 4:02 PM
    #3
    NicoTacoShop

    NicoTacoShop [OP] Member

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    Thanks for the reply. Intake isn’t blocked. Cleaned MAF and air filter for fun. No change. Just sent in old injectors for cleaning so I can get them in and replace the new ones I installed. I don’t know what’s else it could be besides the injectors. Is the location of the air fuel sensor at the throttle body?
     
  4. Apr 24, 2019 at 4:07 PM
    #4
    CS_AR

    CS_AR Well-Known Member

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    Everything but the driveshaft. B03A - 410
    Were the new injector o-rings oiled before installation? I've seen new injector installations have problems with pinched o-rings when the o-rings were not properly lubricated during installation.
     
  5. Apr 24, 2019 at 4:40 PM
    #5
    OneWheelPeel

    OneWheelPeel Well-Known Member

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    Did you leave the battery unconnected for a little bit to re set the ECU?
     
  6. Apr 24, 2019 at 6:15 PM
    #6
    NicoTacoShop

    NicoTacoShop [OP] Member

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    Yes I oiled the seals before install. Battery was disconnected for a while while installing. I think I’m going To wait for old injectors to come back from cleaning then replace the new ones. I was hoping these new ones would work great from what others have said.
     
  7. Apr 24, 2019 at 6:19 PM
    #7
    CS_AR

    CS_AR Well-Known Member

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    Everything but the driveshaft. B03A - 410
    Sorry to hear they didn't work out. You paid a premium price for eBay injectors too.
     
  8. Apr 25, 2019 at 6:31 PM
    #8
    craigs1

    craigs1 Well-Known Member

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    I had a similar experience with "new" Denso injectors from eBay a few years ago on my '03 Tacoma, two were dribblers and flowed much more than spec. Stick with factory injectors or Toyota replacements from the dealer. I did the same thing as you, had my old ones properly cleaned and flow-tested then reinstalled them. No further injector problems.
     

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