Car started running rough the other day and stalled out, tried replacing the maf sensor (when the maf was unplugged it would run) and disconnecting the battery, still happening, mods are aem intake, mpx catted dp/exhaust, zzp charge pipes, mpx ic, gms1, and hp tuned. No apparent vacuum leaks. Any input helps, thanks. Currently have no cel besides the maf codes from having it unplugged.

 

Who are you tuned by?

 

Custom tune, greg gatto. Been running fine for about a week before it happened

 

Try a new MAF?

 

Yeah, put it in and tried disconnecting the battery and it still happened

 

Did the weather change a lot since your tune? Also have you checked the maps for oil?

 

It did get colder the last few days, and i didnt check the map sensors. I only had a cel from the maf sensor.

 

Map is connected to maf readings, and iirc the map readings and maf readings don't make sense to the ecu it throws a maf code

 

Ok i'll check those next, what should i be looking for?

 

What MAF code is it giving P0101? If so you likely have a massive boost leak causing this issue.

 

I cant remember the code, it was mass air flow volume input signal i think.

 

Pull the code(s) and post it up.

 

They codew cleared when i disconnected the battery, it wont stay running with the maf connected.

 

The codes cleared*

 

It should throw the code if it won't stay running, just scan the codes after trying to start it

 

If it won't stay running with the maf connected it's probably likely a pretty good boost leak of some sort.

 

Im gonna check it again when i get out of work, after it starting/stalling it didnt throw any codes yet

 

Looking around for leaks doesn't always get the job done unfortunately. Best way to find a leak is to smoke test the system or perform a boost leak test from turbo outlet to the coupler at the throttle body.

Do you have any way to check what you ltft's and stft's are sitting at? Either through your rpd (if you have one) or through some sort of scanner?

 

I can at work, if i dont see anything obvious later i'll smoke test it tomorrow

 

P0113, p0101, p0100 stored.

 

All maf codes. It's most definitely going to likely be a boost leak, something happened to one of the pins in the maf connector in the harness, or bad wire in the harness.

 

Is it possible the maf extension harness is no good? I can check the power/ground later

 

That is very possible. Is your maf relocated to the lower pipe I assume?

 

Not trying to insult your ability just asking the simple question, the maf is installed in the correct orientation for air flow?

 

It is, have it located where the intake goes down behind the fog light. And i made sure it was facing the right way earlier today.