Tuning with the EBL
01-29-2024, 05:09 AM
#5151
Re: Tuning with the EBL
I have an odd issue, cold starts the engine fires immediately but after a 30-minute drive(190-200F), stop the engine and start it again within 10 minutes, it won’t start unless you fool the pedal. If you wait for 10 minutes the engine starts. There is no issue if I drive from home to the nearest gas station (5 minutes drive), fill it up, and start again with no issue.
Assuming your injectors aren't leaking, and your VE is in good shape... it sounds like your IAC steps and Cranking Fuel needs to be smoothed out in the temperature area in which you're having an issue. Either that or you IAC is sticky and its taking ten minutes for it to catch up to where it needs to be during a hot re-start.
- Rob
01-29-2024, 08:02 AM
#5152
Member
Re: Tuning with the EBL
Sounds like a typical heat soak situation. Leaving a hot engine sit makes IAT go way up due to intake manifold heat. Is your IAT in the manifold or in the intake ducting?
If you can monitor the IAT and O2 during cranking while hot it would help.
Although the O2 sensor will not see a rich condition unless you actually have some combustion happening.
The O2 sensor will not react to raw fuel being dumped on it.
If you can monitor the IAT and O2 during cranking while hot it would help.
Although the O2 sensor will not see a rich condition unless you actually have some combustion happening.
The O2 sensor will not react to raw fuel being dumped on it.
01-29-2024, 09:06 AM
#5154
Member
Re: Tuning with the EBL
On my 1990 corvette the IAT sensor is in the manifold. So, it reads the hot air that is present in the manifold when heat soaked.
With the small engine compartment, the heat soaking is magnified.
Something to think about.
With the small engine compartment, the heat soaking is magnified.
Something to think about.
02-06-2024, 05:27 AM
#5155
Re: Tuning with the EBL
I made these changes to the ebl:
02/04/2024 16:44:15 Scalar: HotRST - Shut Down CTS for Hot Restart changed from 104.75 �C (0xC1) to 119.75 �C (0xD5).
02/04/2024 16:44:28 Scalar: HotRST - Key on CTS for Hot Restart changed from 104.75 �C (0xC1) to 119.75 �C (0xD5).
02/04/2024 16:55:18 Table: IAC - Minimum Idle Steps changed.
02/04/2024 18:37:41 Table: Crank - AFR changed. (changed from 10.0 to 12.8 within the 176F area)
02/05/2024 13:43:59 Scalar: IAC - Volt Drop for Steps changed from 0.40 Volts (0x04) to 0.20 Volts (0x02).
02/05/2024 13:47:10 Table: IAC - Powerup Init Steps changed.
02/05/2024 13:50:41 Scalar: IAC - Steps for Low BatV changed from 5.00 Steps (0x05) to 25.00 Steps (0x19).
I think the engine was flooded after a drive so I had to floor it while cranking. after I changed the above, I took it for a 30-mile drive, shut it, and restart it again after a minute without any issues.
02/04/2024 16:44:15 Scalar: HotRST - Shut Down CTS for Hot Restart changed from 104.75 �C (0xC1) to 119.75 �C (0xD5).
02/04/2024 16:44:28 Scalar: HotRST - Key on CTS for Hot Restart changed from 104.75 �C (0xC1) to 119.75 �C (0xD5).
02/04/2024 16:55:18 Table: IAC - Minimum Idle Steps changed.
02/04/2024 18:37:41 Table: Crank - AFR changed. (changed from 10.0 to 12.8 within the 176F area)
02/05/2024 13:43:59 Scalar: IAC - Volt Drop for Steps changed from 0.40 Volts (0x04) to 0.20 Volts (0x02).
02/05/2024 13:47:10 Table: IAC - Powerup Init Steps changed.
02/05/2024 13:50:41 Scalar: IAC - Steps for Low BatV changed from 5.00 Steps (0x05) to 25.00 Steps (0x19).
I think the engine was flooded after a drive so I had to floor it while cranking. after I changed the above, I took it for a 30-mile drive, shut it, and restart it again after a minute without any issues.
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