ok so this is the second time this has happened. First time tought it was a vac leak tightened the coupler where the charge pipe meets the tb and it ran normal had a misfire code.

no im driving it tonight, runs fine. Get almost home starts being weird. Car gets a weird idle not erratic like a vac leak, just lean, like 16.9-17.3 at idle. then as i drive if it hits boost as soon as the bov goes off car dies like it stalled . Start it back up idles lean again get the misfire code.

IDK if its a vac leak or what I didnt see any obvious ones and it was dark. Did this is sub 40 degree weather, but it was driving fine. IDk what it could be, the misfire code is confusing me

any ideas

 

stalling problem could be cause by your throttle body plate, carbon build up. wont cause lean condition, so possible multiple concerns. or your bov is getting stuck closed, air from turbo into air intake will cause stalling and lean conditions.. or it could be your anti stall set on your piggyback.

 

Sounds like a leaky blow off valve to me.. Is it an hks ssqv?

Unplug the vaume source going to the bov and see if it fixes ur issue!

 

1. exhaust leak
2. bov not seated or stuck open
3. dirty or damaged maf
4. primary o2 sensor fouled or damaged

lots of possibilities

 

bov is a forge fmdv004
ill check the o2 sensor but wouldnt that cause a code as well?
I dont hear a exhaust leak, but Ill check more. and the MAF is a possibility, ut it runs fine then it will start just randomly

 

its not a o2 sensor or exhaust leak.. neither of those would make u stall goin into boost.

maf maybe.
leaking bov for sure..

 

ok Ill check the bov today

 

What boost level did you get tuned at again?

 

^waste gate spring at 8.5psi and its tuned up to 9 where its spiking at

 

OK, Check the bov for leaks.

Take a few pics of your setup so we can look everything over. It will give us a better idea of what could be the issue!


Current pics please!

 

all of em can cause a cel if its bad enough. Most of the time iv seen it be more than one thing but its best to check all the easy stuff first and then move on.

yes its possible mike

 

just out of curiousity where are you tapping your vac lines from?

 

Uh, ill go unplug the o2 sensor on the car, and run open turbo. on my car, or anyones locally will not stall going into boost!


And like i said. The maf is possible. Since this is the source for all readings!

 

With it running those lean values could it be a vacuum leak too?

 

if fuel trims are off it can....do you know his fuel trims?

trying not to have to write a long post but here goes...and this is from exp

(this is just possibilities to your situation op)

1. if fuel trims are off and your primary o2 sensor takes a crap on ya youll run in open loop in which your fuel map is the primary fueling stratigy. The o2 normaly will make corrections to an extent but if its not operating correctly the ecu has no way of making those corrections it could infact run rich or lean depending on the fuel map (in a sense)

 

yes it can, too large of a leak though will do some really goofy stuff.

small leak= lean
large leak= "limp mode" (makes really goofy afr's and hesitation, very hard to accelerate)

 

btw mike he said comeing out of boost not going into boost. " then as i drive if it hits boost as soon as the bov goes off car dies like it stalled "....if his bov is going off in mid boost then yeah deff replace the bov.

 

Mine was doing the same thing when my harness was bad. It was blocking the o2 sensor readings and it was staying in open loop. Sometimes it ran fine but when it got hot after a while of driving it just would run super lean. When I would stomp it it was fine but as soon as I let off the gas the car would stall or hesitate. Idle after an episode of this was really bad and would run mega lean in cruise aswell. I was getting misfire codes but no o2 codes. After resetting the ECU it would run fine again until it got hot or until I boosted it hard and let off the gas suddenly.

Spark Notes: I would check your primary o2 and reset the ECU. This exact same thing happened to me and that was the issue.

 

Maybe he's explaining it wrong.. But an o2sensor doesnt make a bov open under boost..

 

How I read it is the BOV releases pressure then it stalls. The BOV has to release pressure when you let of the pedal. Still could be other issues. It's hard to tell since you cannot look at what is happening. Idle, stalling after boost, stalling after hot is what happened to me.