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Discussion Starter · #1 ·
Fresh rebuild. Lexus AFM, 550 injectors, Wahlbro 255 fuel pump with 12v mod and Aeromotive AFPR. . Ok, heres the whole story from when I got the motor in the car and hooked up to everything. Got it started and it idled perfectly. Then after a couple of run ups and shutting it off to check for leaks, loose hoses etc.. then realized although it idled perfectly it wouldn't rev past 2800 rpm. adjusted fuel pump to 40 psi with vacuum line off and then noticed we forgot to plug in the AFM. Got it started and it revved past 2800 like normal but then developed the idle issue. Checked the voltage at the fuel pump (12v mod) and getting 13.85 volts so it seem normal and staying on. Took out the number 1 spark plug and it was fouled. Replaced the plugs. Lots of black soot so assume its getting too much fuel. Checked the Idle control valve and its good. I checked the cam gears and crank set to 0. lines up perfectly. No matter where I set the CPS for timing it doesn't help. Not sure where to go next..... Oh, also replaced the cheap AFPR because it was leaking and thought maybe it was bad but didn't help and removed the PS belt because it sounds like its going bad and thought it might be starting to freeze up and binding the motor but that didn't help either. And swapped the ECU but nothing.

Obviously I'm missing something.. Why did it idle perfectly before I adjusted the fuel pressure and connected the AFM? I tried readjusting the fuel and unplugging the AFM but it dies even faster then. Any suggestions? Thanks.

Oh and also there is a small oil leak under the turbo somewhere (I think where the oil return line is connected to the block) and the turbo gauge isn't working.
 

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89 Turbo - 2JZGE-T VVti (build/swap in progress)
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Check the coolant temp sensor (the one that goes to the ECU)
Broke that connector on mine while troubleshooting some other problem and it resulted in your exact issue. Fixed the connector, problem gone. I think the ECU freaks out if it has an airflow reading but no coolant temp reading
 

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Discussion Starter · #4 ·
Check the coolant temp sensor (the one that goes to the ECU)
Broke that connector on mine while troubleshooting some other problem and it resulted in your exact issue. Fixed the connector, problem gone. I think the ECU freaks out if it has an airflow reading but no coolant temp reading
Ok, I'll be checking that. Maybe a dumb question but would running the engine without an air cleaner on it cause the ecu to want to give it more fuel to compensate for more air? Also I just noticed that the old AFM housing that I took off the car before tearing it down is covered in oil on the inside. That may have fried the AFM? Also, I tried the AFM sensor from the lexus and it did idle much better but not without eventually dying.
 

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89 Turbo - 2JZGE-T VVti (build/swap in progress)
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Possibly could have killed the AFM, they're very fragile. Strange that it still dies even with the lexus one.
 

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Discussion Starter · #7 ·
Do you have a code 31? That will set a 3000 rpm rev limit and cause all kinds of mayhem.
Elimnated the rev issue, now it has a code 24 and idle is pretty rough. Checked compression and its all good. Did a vacuum test with starter fluid at all of the hoses and gaskets and it seems like no vacuum leaks. Next is recheck the timing and then I'm out of options.
 
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