Sputtering At Boost

[aga]

if it was a vacuum leak it would be rich, not lean. coilpack or sparkplug would be my guess. check the gap on your sparkplugs too.

[Thomas0zero]

Originally Posted by aga

if it was a vacuum leak it would be rich, not lean. coilpack or sparkplug would be my guess. check the gap on your sparkplugs too.

im pretty sure a boost leak will cause a lean condition.

[aga]

Originally Posted by Thomas0zero

im pretty sure a boost leak will cause a lean condition.

nope. cause you are losing air that the airflow meter has measured, so you are getting more fuel than you re supposed to.

[Thomas0zero]

Originally Posted by aga

nope. cause you are losing air that the airflow meter has measured, so you are getting more fuel than you re supposed to.

You know, you're right. Im thinking it was a vac leak i had, it was so long ago. But i had cap blow off the port on the TB under 17psi, caused a hellacious lean condition and the car ran like crap. Capped it and never had an issue again. completely stock Redtop SR20DET.

This guy needs to invest in a Wideband. Sure makes your life easy when diagnosing problems, and an extra layer of security.

[DJ 21o3]

Originally Posted by aga

nope. cause you are losing air that the airflow meter has measured, so you are getting more fuel than you re supposed to.

Sorry but that is not correct. Yes your MAF meters the air from the intake and that determines the fuel, but you got the rest backwards. When you have a vacuum leak, the engine is a vacuum pump and sucks air into the engine from the leak giving you more air than what the MAF read causing a lean condition.

No offense, just letting you know and so others don't read that and get confused. The solved problem proves that it was a giant ass vacuum leak. lol