Its a long story, so i'll shorten it by saying that I am having the boost surge problem that is often associated with the stage 2 kit. In the end, I am running lean, and its not that much fun.

The reflash has not helped the problem, and the dealership is scratching their head, with no solution. They said they want to take the stage 2 off, and test it without, and then they want me to pay to have it put back on. That won't work for me.

So maybe I could bypass the problem.

I feel pretty confident that the problem is a programming problem, but we don't know how to fix it, so maybe I could just get a new MAF sensor, or whatever computer component that may affect this area(I know absolutely nothing about the electronics of the car).

I have heard of upgrades of computer components that increase performance, so I figured that maybe if I get this upgrade, it will not only increase performance, but get rid of this programming problem as well.

I am obviously quite ignorant to the computer related workings of my car, so any help would be greatly appreciated.

Thanks!

 

First thing I would do is find a different dealer, because that one is full of it.

 

How did the dealer determine the engine was running lean? Also describe your surging problem.

 

it sounds like the dealer needs a punch in the mouth and or you getting that problem where it spike 2 18psi than drops to 15 is that what you mean by surgeing

 

Boost surge was a problem that was common with the stage 2 upgrade, and GM came out with a reflash to fix it. I am experiencing the same symptoms, but the reflash has failed to fix it.

I am not positive that I am running lean, it is an assumption that may be wrong. But the acceleration problem feels like a fuel/air system malfunction.

I was hoping that instead of getting the appropriate program to fix it(since the reflashes have not helped), I could just get a new MAFS or computer component that would fix it, simply due to it being a new component(it would basically be like a new tune, but also a new piece that also improved performance).

 

Have you tried pulling your boost bypass hose and seeing if it makes a difference> That is a quick way to narrow the problem down to the bypass solenoid or the bypass mechanism.

 

TKolb325, do me a favor, go ou to you car and unplug the EVAP purge valve. It is the valve that is on the driverside of the cylinderhead, that has a vacuum line running to the supercharger. Drive the car and see if the problem persists. Let me know.

 

Can't say i've tried anything at this point.




I think I am going to take a look at the air filter, talk to the dealership about a MAFS, or let them have their way, and strip off the stage 2.

But I will put up a fight if I have to pay to have it put back on. It would just make no sense.

Perhaps a custom tune to balance out the problem?

Or just wait it out till summer, since it runs soooo much better on warm days?



NJBluess-

I don't think i'll head out to the car till tomorrow morning, but if I catch you before then, what will that possibly due?

I'm not sure if I know what that part does..

 

Let me put it this way, I worked with an Engineer from Gm, for the "surging" that you may be experiencing. The outcome was the new program for stage2. But, not every car experienced the same problems. I had isolated the surging to the EVAP system purging at that given time.

 

i think i have the same thing.

upon half throttle hesitation occurs when trying to boost lightly (lets say to pass a car) and the car feels as if it is hesitating (PART THROTTLE)

WOT is a diff story, the car pulls hard and smooth all the way to redline

I too, have the updated flash

NJSS---What is this EVAP you speak of, can you post a pic of what i disconnect?

 

I don't have pics, nor can I post any. The purge valve is located on the back of the head and has a vacuum hose going to the supercharger. It kind looks like a cylinder with two hoses and an electical connector to it.

 

Unplugging the valve all together will be accomplishing what?

diagnosing if the valve is defective?

Thanks

 

No, I just want to see if it helps, I'm looking for a programming issue here, not a faulty part. By unplugging this valve had fixed 2 cars with the same problem of surging, before the new program was out, mine and another member of this forum.

 

can you elaborate about the programming issue, is the evap purging at low RPMS?

 

 

any ideas on a fix? on a side note, my evap IM moniter is still not ready after 10 cycles