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Shutting Off at Idle

Posted: Wed Jun 01, 2022 12:14 pm
by ivanaguilar7x7
Hello,
My car is having an intermittent issue with shutting off at idle randomly, and moreso when there is more load on the engine (AC).
I first experienced the issue when ambient temps here in southern California began to rise, and with the car on pump gas and dialing the dead times (ID1000), which I read through a previous thread and think I got pretty close, the car randomly shut off once in about 95 degree heat and I attributed it to the alternator rectifier, which I swapped out along with the brush holder and voltage regulator.
I have subsequently began tuning for E85 and I'm able to get part throttle and full throttle all where they should be, but it now shuts off at idle every time. I disabled ELD thinking it was voltage-related, didn't help. It's less likely to do it with AC off and almost guaranteed with AC on and on the logs I can't really determine a reason as to why.
I will attach current calibration and related logs

Re: Shutting Off at Idle

Posted: Wed Jun 01, 2022 12:53 pm
by Spunkster
What has been modified on the vehicle?

Re: Shutting Off at Idle

Posted: Wed Jun 01, 2022 3:33 pm
by ivanaguilar7x7
Sleeved block with Inline Pro F24 pistons/rods kit for 10:1 compression
Inline Pro Stage 2.5 Head
ID1000cc injectors
Walbro 450lph wired to battery, converted to return-style fuel system with -6an feed, stock feed used as return line.
Injen Intake and DC Sports header, currently running non-catted test pipe.

Re: Shutting Off at Idle

Posted: Wed Jun 01, 2022 3:45 pm
by Spunkster
Has this been properly tuned on the dyno?

Re: Shutting Off at Idle

Posted: Wed Jun 01, 2022 3:55 pm
by ivanaguilar7x7
It has not, I haven't been able to make time with my tuner, just wanted to get it running as close to "safe" as I could before going, as when I first was running the built motor the tune was extremely lean. So just working on getting it running well-enough, I haven't touched timing really and was just getting AFRs to a safe value. Just haven't been able to figure the car shutting off at idle so consistently.

Re: Shutting Off at Idle

Posted: Wed Jun 01, 2022 4:30 pm
by Spunkster
Do you have a lightweight flywheel?

Re: Shutting Off at Idle

Posted: Wed Jun 01, 2022 5:09 pm
by ivanaguilar7x7
OEM AP1 flywheel (14lbs).
Didn't want too light so as to keep street drivability. Rotating mass of the motor now seems lighter though so I'm sure that contributes.

Re: Shutting Off at Idle

Posted: Thu Jun 02, 2022 9:13 am
by Spunkster
That is most likely the cause of this. I would wait to see if getting properly tuned has any effect on this.