I have a Evo ix, the problem is that The car dies when I'm reducing or when I stop completely. Also when I'm shifting and leave it in neutral is just die if I don't press the gas pedal./ When I start the car the idle is rough for about 30 sec then goes down and does it again and again. The a/f gauge reads over 18 at full stop and running it while not boosting. After 3 RPM the a/f reads 11.3 to 12.1 full boost. I think fuel is not getting to the system I'm trying to know exactly where are the fuel relays and can't find any info. The light panel goes dim in between seconds when rough idle. Also I bought diagnostic reader and gave me 9 different codes: (I removed the EGR) P0443(evaporative emission system purge control valve circuit) P0130(o2 circuit bank 1, sensor 1) (o2 circuit bank 1, sensor 2) P0031(HO2S heater control circuit low bank 1, sensor 1) P0037(HO2S heater control circuit low bank 1, sensor 2) P0107(manifold absolute pressure BARO sensor low input) P0403(exhaust gas recirculation control circuit) P0243(turbo/super charger wastegate solenoid A) P0090(fuel pressure regulator control circuit) Need help!!

 

Have you had a tune? Sounds like you had someone mess with the periphery bits or you have a couple issues. Have the o2 sensors been replaced?

 

No I haven't replace the o2 sensor. U think is the front one or back? I haven't tune it because the flash port is no longer there next to the obd 2 port it was stolen, the wire it still there but when I took it to the tuner he said it was giving him error

 

Check your vaccum hoses and are you vta or recirculating, also p0443 and p0403 are EGR for obvious reasons. Do not boost the car!

 

All my vacuum hoses are good I replace them, I don't know the meaning of vat but I remove everything that has to do with the egr and replace the egr valve with a STM delete kit. The only thing that I'm missing is the boost leak test, I just ordered the tester

 

VTA is vent to atmosphere, he is talking about your bov setup.

 

Oh ok thanks, mine is vta

 

Has the car been like this since you got it? At the very least you need a tune to turn off the EGR periphery bit. I would stop driving it while you figure it out or get someone to fix it if possible.

The high afr could be from an exhaust leak, a messed up tune, your front O2 sensor going out, or something else (like misplaced vacuum lines).

Are you sure that you hooked up all of the vacuum lines correctly? You are throwing codes from things that require vacuum lines to work properly. Except for the O2 sensor codes.

VTA BOV releases the air that your MAF sensor has already told the engine is there. This can cause the engine to stall when coming to a stop or when letting of the gas. Though it is obvious that you have more issues than just that. I also would think that it would go rich right after you let of the gas for a second.

GL getting it figure out. I know it can be a pain.

 

I would have started with a boost leak test. I've learned the hard way to start with the most simple things first and then work your way up.

 

That happened to me when I ran VTA on my Evo 8 years back. Like mt057 said have you gotten a tune? Put the stock BOV on there.

 

Seems like a VTA issue(vent to atmosphere) on your BOV.
This is an issue if you are on the MAF (sensor that attaches to air intake) and not running speed density.

My car has died when slowing down and also died in neutral.
I run VTA and am not on speed density. No issues anymore after modifying a few things.

Take pictures of your UICP along with BOV and vaccum hose. the vaccum hose attaches from BOV to intake manifold.

-Charlie