3fe Increasing idle, dies when accelerating (7 Viewers)

Joined
Nov 14, 2019
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Orang County, CA
So... I've done everything I could find on the forums. I've adjusted the new tps I put in. Bought and replace IAC. Replaced fuel pump. Bought new intake boots. Bought new afm, new TB gasket, adjust and lubed the dashpot. Replaced efi relay etc... I still get the issue. I drove it for about a week after I replaced everything and it was fine until yesterday morning. Not sure what else to do short of replacing the entire harness. Any other suggestions?
 
Joined
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Messages
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No sir, it will give me problems unless I shut the key off completely and wait 10-15 seconds minimum and even then struggles a bit. If I dont shut the key off at all it won't start at all
 
Joined
Dec 8, 2006
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New Jersey
Seems to run fine when I let the electronics reset with the positive battery cable disconnected. After driving and getting hot for a while it reverts back to this issue. If I dont let it stay warm for a while, <20 minutes, I don't have the issue. CEL comes on very briefly when the issue comes back but always goes away and is never persistent enough for me to read it.
The ECU will keep stored codes until a reset. You can read them even if the CEL is not illuminated.
 
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No sir, it will give me problems unless I shut the key off completely and wait 10-15 seconds minimum and even then struggles a bit. If I dont shut the key off at all it won't start at all
When the engine stalls and you leave the key in the ON/RUN position, is the CEL illuminated?
 
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So the CEL is on before the issue occurs. Once the idle increases the CEL shuts off and doesn't come back on until get it started again.

So short answer no.
 
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So the CEL is on before the issue occurs. Once the idle increases the CEL shuts off and doesn't come back on until get it started again.

So short answer no.
You misunderstand.
When the motor stalls out BEFORE YOU SHUT OFF THE IGNITION SWITCH, is the CEL illuminated.
I ask this specifically because WITHOUT THE MOTOR RUNNING with the ignition switch in the ON/RUN position, the CEL MUST BE ON FOR THE MOTOR TO RUN.
If the CEL is not on with the key in the ON position WITHOUT the motor running, it indicates the the ECU is not in a "ready" state.
 
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Got it thank you.

Yeah the CEL is off after motor dies, when key is left in the on/run position
OK. You need to verify that the ECU is still receiving power when it is in that state.
First check would be to verify that pin 8 (B+) of the diagnostic connector on the firewall is at +12. This verifies that the EFI relay has closed and is feeding +12 to the ECU and the rest of the sensors.
I would also replace the 3 fusible links off the positive battery terminal if that hasn't been done. They should be changed with every battery replacement as they are susceptible to vibration fatigue and can become intermittent.
 

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