Random engine stalling and choking issue - no DTCs, Service Engine light on

Sarithis

Hey!

Once a month or so, my car starts experiencing issues with the gas pedal response - it just chokes and shuts off. Typically, rapidly pulsing the gas pedal is the only way to restart it. Otherwise, it just cranks without turning on. When it does restart, the car continues to choke for about 10 seconds before suddenly responding normally to the gas pedal, with the RPMs shooting up. It then functions smoothly for about another month. This issue occurs randomly, irrespective of whether the engine is cold or warm, and no matter my driving style.

Unfortunately, this time the usual fix didn't work. Even after over two minutes of pulsing or fully depressing the gas pedal, the car continued to choke and wouldn't fully start, as you can see on the video - when the pedal is red, it means that I'm fully pressing it. Once I stop engaging the pedal, the engine dies immediately and the "Service Engine" light comes on, though no DTCs are being reported.

From my checks, the throttle body is operational as evidenced by the boost meter behavior: creating under-pressure when I release the gas pedal, and pressure equalizing with the atmosphere (0 bar) when fully pressed. Both MAF sensors and the throttle body were thoroughly cleaned about two weeks ago, which didn't resolve the issue. The fuel pump also appears to be working correctly, as it remains audible during these episodes.

Any insights on what might be causing this problem? I eventually managed to fix it by holding the gas pedal depressed and allowing it to choke for like 5 minutes straight - suddenly, the RPMs shot up and I could let go of the pedal, which is the usual fix, but this time it took a few minutes instead of just 10-15 seconds.

Relevant mods: Vortech V-3 Supercharger, Stillen fuel injectors, A2A, no cats, custom exhaust.

https://youtu.be/mDEBxW7wyts

2011 Nismo#91

Generic OBD 2 scan tools won't always be able to read all codes. With that said if you have fuel and you have air the last thing is to check the spark. Coils and plugs. See if you can take it somewhere with a good scanner tool, could save you some time and money.

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