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
Shutting Off at Idle
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- Posts: 10
- Joined: Sun May 22, 2022 6:36 pm
Shutting Off at Idle
- Attachments
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- datalog0039.fpdl
- (773.45 KiB) Downloaded 110 times
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- datalog0040.fpdl
- (203.37 KiB) Downloaded 111 times
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- datalog0041.fpdl
- (1.38 MiB) Downloaded 105 times
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- Partial E85 figuring things out.fpcal
- (10.33 KiB) Downloaded 122 times
Re: Shutting Off at Idle
What has been modified on the vehicle?
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- Posts: 10
- Joined: Sun May 22, 2022 6:36 pm
Re: Shutting Off at Idle
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.
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
Has this been properly tuned on the dyno?
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- Posts: 10
- Joined: Sun May 22, 2022 6:36 pm
Re: Shutting Off at Idle
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
Do you have a lightweight flywheel?
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- Posts: 10
- Joined: Sun May 22, 2022 6:36 pm
Re: Shutting Off at Idle
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.
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
That is most likely the cause of this. I would wait to see if getting properly tuned has any effect on this.