Heard a pop and now won't idle and dies

[LiquidX]

Last night I went to start the car and there was a popping sound :bang:. Scared the GF and she said it sounded like it came from the engine region. I got the car started and it would idle at 1500-2000 and then just slowly drop down.

It would keep dropping down and then just die. I checked it today and it's doing the same thing still.

I took a few logs and I zeroed out my airflow sliders, didn't help. Set my fuel trim back to what they should be set for (1250) and still nothing. I even adjusted my dead time and it's still dying.

While logging, my wideband is reading VERY lean (maxed out) and my o2 isn't cycling (running narrow band simulation from wideband). Closed loop is staying a "1"


Please help me figure out what happened. I'm wondering if an injector isn't firing? Last log shows injector data and they are turned on.

 

[92awdgsx]

Check your ic piping. Make sure you didn't blow a coupler. Do boost leak check.

 

[turboboy4]

Definately sounds like an ic coupler popped off

 

[LiquidX]

Let's imagine a coupler didn't pop off. When I go and drive my wideband reads richer.

My o2 doesn't cycle a all at idle either.

EDIT:

Turns out the pop that was heard was a vac. cap blowing off the back of the intake manifold. I don't know why it blew off at idle but hey, everything is working now.

 

[turboboy4]

Good find