P0100. Tried every possible fix. Literally.

[DsmDanielson]

So I just got done installing my new turbo and exhaust manifold gasket, redid all my intercooler pipes, and did a free mod to my throttle body that involves screwing in a spring all the way and removing the coolant lines. Went to start my car and it fired right up after a month of sitting. As it was idling , it was a constant rich condition, (not pig rich) but way over on the rich side of the narrowband A/F gauge. It'd idle like that for about 15 seconds, then go way lean and struggle to stay on, but after a few seconds, went back to the rich condition. It does this until the car dies. I thought it was my new ebay piece of crap regulator, as it wasn't showing fuel pressure and was leaking a little. Put on the oem one, same problem but slightly better idle. Threw a p0100 code shortly after. I unplugged the MAS, no change. However the MAS is good? I traced the wires to the ecu as well. I even backprobed the mas and everything checked out okay. I even went as far to rewire up the SAFC 2, still no avail. I don't know what else throws the p0100 code but this is ridiculous . If I press the gas, it goes lean and dies unless I baby it. Anyone have a problem like this before? I've searched two days and found nothing like this.

 

[boostdawd]

Have u checked the caps on your ecu?

 

[DsmDanielson]

Um... actually no I didn't think that anything was wrong with my ecu. Usually, (like my last ecu) I would get multiple cel codes if something was wrong. How would I go about checking my caps?

 

[boostdawd]

https://www.ecmtuning.com/wiki/ecurepairhome

Scroll down to corrosion examples.

 

[DsmDanielson]

Looked for corrosion in my ecu and didn't see anything. I even looked in the hard to see places with a flashlight. I'm going to change my fuel filter and see if that helps, any other ideas ?

 

[bling5tatus]

I'd boost leak test your car since you just redid intake piping.

 

[Dstarperformance01]

I'd boost leak test your car since you just redid intake piping.

^+1
It never hurts to check!

 

[Dstarperformance01]

Sounds like you are getting unmetered air behind mas. If you unplug mas and no change that should be a dead give away with a rich condition.