 JDM 3rd Gen 3SGTE Closed Loop Lean Misfire / Poor Idle, Engine Goes to Closed Loop EFI, it Coughs, Stumbles, and Misfires |
 Jan 25, 2021 - 9:20 PM
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Enthusiast Joined Mar 27, '18 From Seattle WA Currently Offline Reputation: 0 (0%)  |
About 6-8 months ago, I installed an EBC solenoid for the already-wired in Greddy ProFec B Spec II in my ST205 front clip conversion (JDM 3SGTE, 3rd Gen, stock ECU) 1996 GT. During the week I had it in, it developed a misfire at idle (and a sputtering cutout between 2800-3100 RPM). The misfire appears to be as soon as it switches into closed-loop EFI mode and is as dramatic as someone flipping a switch: one second it is fine, and the next: cough, sputter, choke and AFR usually around 16-18 from 14.7. It is usually worse the hotter the engine is. It seems to be intermittent and can go a day or two without issue. As soon as I step on the gas and get it north of 3k it is typically fine and I'm good.
Please advise. Aaron |
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Feb 9, 2021 - 3:08 PM
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Enthusiast Joined Mar 27, '18 From Seattle WA Currently Offline Reputation: 0 (0%) |
QUOTE (J3rkyBoy @ Jan 25, 2021 - 9:20 PM)  About 6-8 months ago, I installed an EBC solenoid for the already-wired in Greddy ProFec B Spec II in my ST205 front clip conversion (JDM 3SGTE, 3rd Gen, stock ECU) 1996 GT. During the week I had it in, it developed a misfire at idle (and a sputtering cutout between 2800-3100 RPM). The misfire appears to be as soon as it switches into closed-loop EFI mode and is as dramatic as someone flipping a switch: one second it is fine, and the next: cough, sputter, choke and AFR usually around 16-18 from 14.7. It is usually worse the hotter the engine is. It seems to be intermittent and can go a day or two without issue. As soon as I step on the gas and get it north of 3k it is typically fine and I'm good. Please advise. Aaron |
Posts in this topic
J3rkyBoy JDM 3rd Gen 3SGTE Closed Loop Lean Misfire / Poor Idle Jan 25, 2021 - 9:20 PM
slavie Vacuum leak? That's one thing that gets better... Jan 28, 2021 - 10:04 PM Bitter If you can't get live data from the O2 it... Jan 29, 2021 - 10:30 PM Consynx What Bitter said: if you’re reading the AFR... Jan 31, 2021 - 9:19 PM enderswift This sounds identical to what I was dealing with f... Feb 1, 2021 - 2:53 PM J3rkyBoy I want to say thank you to all you guys who respon... Feb 9, 2021 - 3:05 PM
slavie The pulsing on the fuel line is probably normal. T... Mar 1, 2021 - 11:22 PM |
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