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93 2jzge lean code (code 25)

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#1 wesleyx62


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Posted 16 October 2017 - 11:14 AM

i keep pulling a code 25 fuel system lean on my 93 sc300 2jzge (in my 78 cressida). here is a list of things i have already check/tried

  • rebuilt ecu and have already tried swapping with a known good working unit. 
  • new o2's (single wire)
  • re-calibrated tps
  • checked intake manifold and injectors for vac leaks (with brake clean while running) 
  • new injectors (rebuilt) 
  • i have a inline walbro 255 from summit
  • fuel pressure reads accordingly and doesnt fade after getting warm

im out of ideas and im looking for advice as to what i should be leaning towards now...


a few things i have considered but am not sure about:

  • walbro is external inline (my car came with a mechanical fuel pump on the 4m) possibly causing a pickup issue in tank as the higher pressure required from the new pump
  • iac vacuume routing incorrect. i need to find someone who has done a deleted egr and all other emissiosn related vacuume set ups like me. 
  • i suck at building cars and should pick up gardening instead. 

Thank you for any real help.


#2 Gordo


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Posted 16 October 2017 - 01:32 PM

i suck at building cars and should pick up gardening instead. 


I think you found the answer...


But Wesley Crusher, converting a car from carb to EFI is not as simple as you think.

I suspect you are cavitating your pump due to poor pick up inside the tank.

And if you don't have the pump mounted level with the bottom o the tank, that makes it worse.


The tube in the tank was meant to feed what, maybe a whole 150 HP.


You are beyond skate boards, and building cars on Gran Torismo.

So if you can't handle it, try gardening.

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