Vinjpal561

I have an 2006 cobalt ss with stage 2 upgrades, 2.8 pulley and bigger injectors and a reprogram of the computer running 15 pounds of boost and 93 oc fuel. when I hit full throttle the car cuts out on me. what could this be?

insylem

Spark Blowout? Check your plugs.
Also check your DTCs. (Diagnostic Test Codes)
You can have them read at autozone if you don't have a reader yourself.

Also what stage 2 setup are you running?

GM Stage 2 (42lb injectors) + 2.8" Pulley = Maxed out Injectors...

Vinjpal561

I just got the car last week so i never checked the plugs yet.
Also no codes come up and this problem doesn't happen ll the time.
And I also dont know what injectors are in there but the guy said he did the GM stage 2 setup to the car. If i was running with 42lb injectors and a 2.8 pulley what do i need to do?

ItalianJoe1

iTrader: (10)

What do you mean it cuts out?

Like the engine quits running?

Is it only one pop? Does it happen at the same RPM all the time, or vary?

Just saw that you are local. By any chance is the car yellow?

Vinjpal561

when im in 2nd gear, some times when I go w.o.t it would start missing or not getting enough fuel.
and no my ss is orange.

Vander Nars

iTrader: (5)

Gm stage 2 injectors cant run a 2.8 pulley most people max them out on a 3.0 pulley some can run a 2.9 but the only people that have been able to run 2.8 on 42s live up very high above sea level u need to order a 3" pulley and swap them out so u dont hurt ur engine

Vander Nars

iTrader: (5)

Btw im at 136 feet above sea level and i run 42s and a gm stage 2 pulley(3.06") and my injectors where at like 110% by the end of my power band so that will give u an idea of why ur injectors or running out of fuel when u got WOT.

insylem

Glad I switched to 60s for my 2.85"

Vinjpal561

Ok so I just looked at my pulley and it says 78.0 on it witch is a 3.06in pulley with 42lb injectors so with that said why would it be cutting out at w.o.t?

Vinjpal561

Also i want to get a programer for my laptop whats a good one and could this help fix my problem ?

insylem

Just some guesses
Spark Blowout? Check your plugs,
Stopped up Fuel Filter, Check/replace your fuel filter

boostedperformance

i have a 2007 cobalt ss supercharged and mine just recently started doing the same. at the end of gears before i shift it sputters and the boost gauage flutters from 10-16 psi at wot then ishift it goes normal till the end of the next gear? ive checked plugs, new fuel filter everything. mine is completely stock other than zzp 3in intake thats it?

boostedperformance

also cleaned throttle body and maf sensor air filter is clean.

lwrs10

noone has mentioned this yet......belt slip. Esp with boost drop.

AcyclicCobalt21

I have the same stuff done to my car too and its orange with the g85 package. But when i do go w.o.t the car starts to sputter and when i let go of the gas it is back to normal...

IonNinja

Check spark plug gap to start

boostedperformance

all my plugs are gapped at .045

YelCal7

iTrader: (1)

This is exactly the same as mine. I am on 2.9 with 42lbs, I am planning to switch to 60lbs. And you should be gapped at .035 is the best. Most guys gapped them at .035 to be safe and not have spark blowout.

boostedperformance

i went and bought new plugs gapped them to .035 still does it.

Vinjpal561

All good thoughts, but get this one...I think this is happening to me only when my gas tank is low. I also think that the fuel pick up is in the front of the gas tank so when i get on the throttle all the gas goes to the back of the tank and does not pick up any fuel. I filled up today and i dont have the problem any more

boostedperformance

i have half a tank and still does it. maybe bad throttle body??? or maybe a tune? but my car only has a intake.

YelCal7

iTrader: (1)

It's all about the fuel injectors size and tune.

boostedperformance

my car is stock other than an intake y would i need injectors tune maybe but y injectors???

YelCal7

iTrader: (1)

Cause, the smaller the pulley you go then not enough fuel to cover the amount of air that is forcing into your engine. Your fuel injectors are maxed out at least the most is 3.1 that what it said on ZZP site. If I were you go research on ZZP site you will find the answer that you are looking for. As of right now I would be DAMN careful with 2.8 and 42lbs. It's not safe, you can end up fried your fuel injectors.

ItalianJoe1

iTrader: (10)

Other than a little lean up top, the 2.8/42's setup is fine, I ran it for over 2 years and it never hurt anything.

His problem is an actual problem, not the "OMG YOUR INJECTORS ARE MAXED OUT, YOUR CAR IS GONNA BLOW" urban legend issue.