Zero or light load fueling issue
Hi everyone. Getting the Miata back on the road after too many months down due to various excuses. Looking to try to educate myself on tuning the MSPNP.
The motor exhibits a strange momentary fuel cut every three seconds when under light or no load off idle. It’s like clockwork. Video wouldn’t upload, but this screen shot shows which fuel cell I’m in (around 2000 rpm), and the green AFR line shows momentary lean events every 2-3 seconds. Any ideas where to start looking? thank you in advance. https://cimg3.ibsrv.net/gimg/www.mia...d85dac156.jpeg |
If you want answers instead of guesses post your tune and a log.
|
Current tune and data log showing event
2 Attachment(s)
Thanks again!
|
It's overrun fuel cut, or more generally, poor idle tuning. MAP reading dips under the 25kpa setpoint for overrun fuel cut, and then after a 1sec delay, it cuts fuel. Once MAP rises above 25kpa, the fuel turns back on, and the cycle repeats.
|
Originally Posted by Savington
(Post 1521197)
It's overrun fuel cut, or more generally, poor idle tuning. MAP reading dips under the 25kpa setpoint for overrun fuel cut, and then after a 1sec delay, it cuts fuel. Once MAP rises above 25kpa, the fuel turns back on, and the cycle repeats.
|
All times are GMT -4. The time now is 12:12 AM. |
© 2024 MH Sub I, LLC dba Internet Brands