Well, I had my GM Stage 2 put on about a week ago or so, and in the past few days I've noticed something strange. When first starting up my car, the idle seems to be at about 1100 rpm rather than the 850 or whatever it normally is. Also, if I just normally drive down my street, as soon as I shift into 2nd the car falls flat on its face.. almost like it stalls. A split second later everything is okay and I'm accelerating normally. After about 5 minutes of driving both of these symptoms go away.

What is going on? I checked where the intake meets the s/c and everything is snug - no air leaks. I do have the Injen intake; could that be messing with the Stage 2 flash? Do I need to unplug the battery and reset the computer (plan on doing this tomorrow). Do I need new NGK BR7E (or whatever) spark plugs? I thought maybe the s/c might not be sealed properly against the intake manifold, but I have no idea how to check this. Any other ideas?

 

I have an injen intake and never had that problem. I dont know what would cause that but for it to go away is a little strange. I would definately make sure your current plugs are clean, and when they flashed your ECU it was suppose to relearn everything anyway. I would take it to the dealer and see what they can find out maybe an invisible code was pulled or something

 

ive have stage 2 only and have never had that happen.
take it in!

 

Mine has done this a few times. I dont know what it is but it dosnt throw a code.

Later

 

Mine has done this a few times. I dont know what it is but it dosnt throw a code.

Later

 

take it in. mine was at about 1k rpm for only a few miles and after I got on it a couple times it has never happened again. Currently sitting at ~800 rpm with no issue and shifting is no issue either

 

Does this only happen right when you start up the car, and its still warming up?

 

Ya I would like to know that too because if it is cold then that is the problem but if your let it worm up to 180 the it should not do that. I only say this because I think my car has done this when it is cold and I am just starting off. I have not had this problem in a long time know. give it a copply of full wormup days befor you start off and see if it dose not happen any more.

 

i have that same problem i should take it to...to see what the problem is

 

Yep. Although this morning it did not do it. I have no idea. I guess I'll see if it still happens before I take it in.

Edit: I did hear somewhere about a Throttle Body TSB.. I don't remember if it was for the s/c version though.

 

First, the car idles higher because of the bigger fuel injectors. They pump more fuel than the old ones even at idle. Another part of the idle answer is GM included a fix in the reflash for sporadic idle that some ss/sc owners have been experiencing. So they set it a little higher than stock.

Next, the car feels like it looses power when shifting because your pulley is now smaller with Stage 2. Your motor is what rotates your supercharger. Now that the pulley is smaller, the motor works a tad harder when you're not under boost. That's why after that split second of shifting, the car feels ok again, it's because you built a little boost. The fix is use a little more gas after shifting and shift at higher RPM's. I hope that helps. Don't worry nothing is broken.

 

The same thing happened to me twice now total in ~2 weeks since installing stage 2.

Your explanation would produce a much more subtle difference than I think Tempest3D (and I) are seeing. The car when hooked up in second essentially stops accelerating, throws you forward in your seat. I'm not too concerned yet because it hasn't happened in like a week. I've had hesitation problems stock as well, so maybe its the same problem made more dramatic because of stage 2 -- just a guess tho.

 

mine does the same thing...its just cause the engin is cold i think...not a big problem...BTW i just win 5 race with an infinity G35 and there no way this car can pull in front of me

 

WOW, it throws you forward? Best I can say is try shifting at 3,500rpm from now on. If it still does it..... I don't know.

 

took my car to the dealer for the exact same problem the guy spent 5 hours taking my car apart to try and find the problem he said that his conclusion as well as gm's tech center is that when i removed the rev it up stage kit that the "dead wires" i left their are causing some problem while running the ac b/c that is when mine did it and he said that he couldn't find anything wrong with the car otherwise. He had the supercharger off he was about to look into the tranny i mean this guys spent hours on my car and couldn't find anything wrong with the car other than that. by the way if you had a problem with a seal somewhere you would hear a loud hissing noise b/c a supercharger is in a vaccum when not boosting so the negative pressure would force alot of air into the leak. i know this b/c my injector o-rings blew after i put my stage 2 in and had that problem. and i don't really like the ngk's i have the 2 range colder plug and i don't think it made any difference that i can notice. buy the autolites everyone with intense kit swears by them.

 

Its normal for the car to do it, if its not warmed up prior to driving, we have drive-by throttle, thats why.

 

i believe it is drive by wire ( i need to stop drinking so much i don't think i spelled that right) not drive by throttle

 

Yeah, the first time it happened I thought I might have hit the brake instead of the gas.. its VERY VERY noticeable. (it was hard enough to lock my seatbelt). And yeah, shifting higher for the first few accelerations fixes it, but I still dont think it should be happening in the first place.

 

all i know is that you guys better not be ripping your cars with the engine cold. not a very good idea. the symptoms go away bc ur engine is warmed up. and having a car idle at 1000 or so on startup is COMPLETELY normal. if u have to drive ur car without warming it up, take it easy, shifting early and not punching it

 

did u ever figure this out because whenever my car sits overnight and i start it up it runs perfect.

I slowly take off out of the driveway shift into second and BLAH the car almost shuts off....major spudder for a split second....doesnt matter how easy i am or how careful i am with the clutch, it does it every time when its been sitting.

 

Well your in luck.... take it to your local GM dealer and have them fix the problem.... Remember the Stage 2 kit is covered by your warranty

 

I found the fix for this!
Remove you plugs and celan them. Then regap them to about .042 and its gone. and you will have more power to.

mine runs 100% beter now.

Later

 

I was either going to do this or I was thinking about some 1 step colder plugs. My only problem is everyone has a different opinion on specific plug and plug gap, so I'm really lost in that area. I was going to order some NGK BKR7E or EIX and see what happens.

 

How do people hit the brake instead of the gas? I've wondered that.

 

I dont think its really possible and Ive never actually done it, I was just trying to find an analogy show how bad the problem really is. The first time it happened it locked my seatbelt cause i shifted so far forward.