Hey guys. Just trying to gt some input And see if anyone else has ever heard if this or seen it? So just got my car back from my tuner/mechanic and we were noticing the car lean out when you depress the brake pedal while sitting in park with car at idle! We checked the brake booster and the check valve, but somehow there is air getting back into the intake manifold? Has any one ever heard of this? Any info would help!

 

what kinda of bov do you have? and you have a vacuum leak somewere i had the same problem. and my pos hks bov was staying open at idle causeing my car to lean out at idle!

 

Anybody else got any info??? Any help would be great!!!

 

I doubt it's that bc the car would be lean allthe time and not just when u put ur foot on the brake.?

 

lol no. my car ran ok when it was driveing when i come to a stop to idle it lean'd out. start ur car. let it run. unplug the vac line from the bov. if ur afr's go back to normal. there u go. other than that. check all vacuum line's you got a leak

 

I would check all the vac lines first, what fuel managment are you using ?

 

check the bov do what i said if you have the hks bov. i had the same exact issue ur haveing. the bov failed. if that doesint work. get some MAF cleaner and spray around all the vacuum line's and every coupler!

 

im running the emanage set up right now. checked the bov... its not that! what we found was that theres a vacumm line coming from the brake booster and going to intake mainfold. we think were getting air fromo there??? but the brake booster and the check valve are checking out ok!


so were still kinda stumped??? dont know exactly how the air is getting into the manifold???

 

What does your boost gauge read at idle ? you should see around -22 at idle

 

My car does this too and im not boosted. I'm barely modded. lol.
I think its normal. I usually hit around 16.8 if i keep on hitting and releasing the brake.

 

dont know what the boost gauge reads?? ill check it out and let you know.



thats what mine will read also!! right around 16.8 ???