Help - 102902 Air volume 2, plausibility: Air volume too low

[M6Roar]

Not sure how to start this but maybe some one had the same issue could help.

To explain the situation, two nights ago while driving I hit the throttle up to 50% and heard something pop from the engine bay. 1 min later I got this code "102902 Air volume 2, plausibility: Air volume too low"

So far I have replaced my charge pipes, switched HFM between banks and replaced the silicone coupling between TB and Intake.

Symptoms: Car is hesitant and feel like misfiring, once both HFM disconnected car feels much better.

Your support is highly appreciated.

[Whipple]

What happens when you go wide open throttle ?
Does it go into limp mode ?

[Kamate]

Check your turbo.

[M6Roar]

Originally Posted by Whipple

What happens when you go wide open throttle ?
Does it go into limp mode ?

No, nothing happens actually. Just loud whooshing sound driver side.

[M6Roar]

Originally Posted by Kamate

Check your turbo.

Define check, my guess is the exhaust side but didn't have the time to check that yet. Also I don't smell carbon in the engine bay to suspect a leak from that side.

[Whipple]

You have to do a smoke test , You obviously have a leak , To me it sounds like you may have split an intake manifold , same thing happened to me

[M6Roar]

Originally Posted by Whipple

You have to do a smoke test , You obviously have a leak , To me it sounds like you may have split an intake manifold , same thing happened to me

Thank you I will check that out. what problems you had when that happened?

[Whipple]

Originally Posted by M6Roar

Thank you I will check that out. what problems you had when that happened?

I would get a check engine light , I would clear it with a JB4 and then it seemed to be ok , but if I would go into boost I would get a check engine light again and the car would go into limp mode , I split the drivers side intake manifold , engine has to come down to fix this to change the intake manifold

[M6Roar]

That sounds expensive lol. So far none of that happened yet. Did the smoke test, no smoke showed up from anywhere. Opened the meth port in the charge cooler and smoke was flowing, so I actuated the TB to keep the smoke moving down the manifold intake

My last theory is the clamp between turbo and DP snapped or cover valve.

[M6Roar]

New findings, when RPM is above 1500 the code disappear and comes back when I am at a stop. checked both tank valves, DME 2 tank valve has less suction.

[M6Roar]

Decided to make a log and it looks weird. negative boost at DME2 is higher that DME1, during WOT DME 2 is not achieving the requested boost yet no limp or code or anything! after throttle closure pre-boost is achieved. I would appreciate any suggestion at this point lol.

https://www.bootmod3.net/log?id=625c...0b433478a9ea70

[Whipple]

Im just guessing here but maybe it can be one of your pressure sensors map sensors ? Its the sensor on each side of the intercooler and they read the boost pressure from each side,

Because in one of your logs I see 13.8psi from one turbo and 7psi from the other thats way off ,

but on another log you have a 21.9psi and a 19.7 that is much closer to the target,2psi off from one another is basically normal in some cases, it happens to mine sometimes there perfect sometimes or can be off 1 or 2 lbs ,it seems to sporadic to have something popped off

how is the car running now?,how is the idle? whats your afr at idle ?and how does it feel when you accelerate hard ?

[M6Roar]

Originally Posted by Whipple

Im just guessing here but maybe it can be one of your pressure sensors map sensors ? Its the sensor on each side of the intercooler and they read the boost pressure from each side,

Because in one of your logs I see 13.8psi from one turbo and 7psi from the other thats way off ,

but on another log you have a 21.9psi and a 19.7 that is much closer to the target,2psi off from one another is basically normal in some cases, it happens to mine sometimes there perfect sometimes or can be off 1 or 2 lbs ,it seems to sporadic to have something popped off

how is the car running now?,how is the idle? whats your afr at idle ?and how does it feel when you accelerate hard ?

I have replaced both sensors DME1 and DME2 same thing. My money is on physical rather than electronic, if you notice the last graph the boost is achieved when TB is closed and at the first graph DME2 vacuum is higher so I am guessing you were right about the intake manifold. Will do another smoke test this time after the TB and see how it goes. If that didn't work then its definitely the turbo.

[RagtagXMASTER]

Have you checked the airbox right before the turbo? There is a gasket that slides into in the turbo that may have failed. But I wonder if your pop was actually the intake manifold. The air box is not pressurized but could be broken. Thankful the intake track is small on this car

[M6Roar]

Originally Posted by RagtagXMASTER

Have you checked the airbox right before the turbo? There is a gasket that slides into in the turbo that may have failed. But I wonder if your pop was actually the intake manifold. The air box is not pressurized but could be broken. Thankful the intake track is small on this car

Thank you for your input.

I replaced them last year when I installed my PG charge coolers. I also still have doubts its the intake manifold as my max boost is 22psi and I wasn't even full throttle when it happen say around 12 PSI but when I looked at the end of the data log when throttle is closed I am at 19 psi which seems like an issue after the throttle body. After the throttle body there are 3 things that might cause it, stuck valve(no vacuum at the exhaust so its fine), broken fuel tank vent pipe leaking air and finally blown intake manifold gasket. If all of that is fine I will get a camera through the O2 sensor to check the exhaust turbine

Will keep testing and update you guys.

[M6Roar]

So I checked the exhaust side of the turbo and it looked fine to me, VANOS reading is the same on both banks. Now its time to assume that the PVC system is gone (the one under the valve cover)

[Spacecpe]

This sounds a lot like an intake manifold. A bit strange that you didn't get any smoke tho. But it's definitely a leak somewhere since you hear a whooshing sound.

[M6Roar]

Originally Posted by Spacecpe

This sounds a lot like an intake manifold. A bit strange that you didn't get any smoke tho. But it's definitely a leak somewhere since you hear a whooshing sound.

Will give it a shot again with a proper smoke machine and extra PSI's. Thanx for your input.

[TinCanSailor]

You could also spray some starter fluid in the suspect area on the intake side. If you are getting pirated air in the intake you'll hear the engine rev up as the starter fluid spray will burn with the air and fuel.

Use it sparingly though as it combustible.

[M6Roar]

Originally Posted by TinCanSailor

You could also spray some starter fluid in the suspect area on the intake side. If you are getting pirated air in the intake you'll hear the engine rev up as the starter fluid spray will burn with the air and fuel.

Use it sparingly though as it combustible.

The starter fluid sitting at the garage for two days now but hesitant to use it lol don't want to get caught in fire

[TinCanSailor]

Originally Posted by M6Roar

The starter fluid sitting at the garage for two days now but hesitant to use it lol don't want to get caught in fire

lol, I hear ya. It is best if you have someone in the car to kill the ignition plus Don't do it on an extremely hot engine. If you focus your spray you shouldn't have any issue though I've done this 1 million other time zone on my cars.

[M6Roar]

Originally Posted by TinCanSailor

lol, I hear ya. It is best if you have someone in the car to kill the ignition plus Don't do it on an extremely hot engine. If you focus your spray you shouldn't have any issue though I've done this 1 million other time zone on my cars.

Good news engine didn't rev bad news I am leaning more towards the PCV system under the valve cover slipping more returned gas due to broken check valve.