Reading past posts on this forum has helped me help myself so much, and I really appreciate it. Now I need to start a request for help of my own.

I am having an issue with starting hot that someone might have an idea on.

My Miata starts fine and runs when cold, or even at 140 degrees. However, if I try at 180 degrees (warm it up to 180, turn it off, and try to start again), it just cranks (no stumble or anything). It was idling fine when I turned it off at 180 degrees. I have tried a variety of throttle positions (WOT, pump, just a little). The MS log shows a lack of fuel. It shows 97 CCs when starting at 140 degrees, but just 4.6 CCs when starting at 180 degrees. I have verified spark (saw an arc with wire pulled), so it seems like fuel and likely a config issue in MS with the injectors.

Here are a few details about the setup, with a focus mainly on fuel...

1993 Miata.
MS3PNPPro.
1999 1.8 motor.
Natural aspiration.
Skunk 65mm throttle body.
EUDM flat top manifold ported for TB, gutted, and ported.
FlowForce 380 injectors.
Dead times and flow rate configured in MS per FlowForce instruction.
DeatschWerks 325LPH fuel pump.
MTuned fuel rail.
KTuned adjustable FPR.
Battery new and fully charged (on tender).
Recent 93 octane.

Thank you in advance for any ideas you can point me towards.

 

See if it wants more fuel, go to your cranking pulse, and at 181 degrees, change that 43 value to 63. I don't see anything else wrong besides some weird idle behavior, and your coolant sensor, which seems to be following RPM a bit.

 

Thanks, Curly. I will give it a try later on today when I have time. Your answers to other questions have helped me, too.

 

Ran a quick test and setting the cranking pulse to 63 seems to have fix it. Thank you very much!