Hey guys,
My cobalt is sputtering upon startup. The rpms will hardly jump, and the boost gauge will reach about -5 to 3 lbs for a second. This will happen mostly during the days first startup, and only for about 10-15 seconds. The car will work it's way from ~1450 rpm to settle at about ~950. If the car is warm the amount of sputtering is substantially lower, minimal.
Just curious about what's going on.. Please feel free to ask for addition details.

Thank you everyone!

 

clean your tb.

it may be a bad MAF, i had a bad one and it was a biznatch to diagnose. It finally **** the bed and the car wouldnt turn on. replaced it and it was like new.

 

Tb, Maf?

 

Throttle body and mass air flow sensor. Clean them.

 

Can someone post a picture of the location.. Or a guide?

I have an injen cold air Intake FYI.

 

you will have to look at live data to properly diagnose the issue. Clean both like they say for now.

 

possibly the fuel sensor? mine went bad and my car did the same every morning i started it but was completely fine for the rest of the day

 

There is no real fuel sensor in our cars. However, fuel pressure is being monitored. Clean your mass air flow and throttle body for now. see what happens. if that does not work you will have to check the live data that the computer sees from the Throttle position and the amount of air the computer sees from the MAF sensor.

 

Weird double post

 

Clean your throttle body. Mine did the same thing and looked like this:

 

My dad said it shouldn't be dirty at 63k miles. 2006

 

I would go with the 2 suggestions above. Check the MAF sensor on your intake, clean that with the MAF cleaning spray you can buy. and clean your throttle body.

 

There are a lot of things that "shouldn't" happen yet they do. Not to discredit your fathers knowledge but I'm sure some ppl on the forums know a hell of a lot about these engines, and a dirty throttle body causing problems on a LSJ is common.

 

It will def be dirty at 63k if it hasnt been cleaned before.

I clean mine once or twice a year just as general maintenance.

 

Old or improperly gapped plugs.

 

You have a supercharged car right? The throttle bodies on these cars tend to get real dirty.

 

your car is shooting lean real quick and once your o2 sensor kicks on it adjusts fuel, as to why it just randomly started this, most likely maf related

 

I'm not doubting anyone knowledge! Also, I'm not saying my father knows all.

I will arrange to clean the Maf soon.. Unfortunately I have to work alllll weekend

 

takes like 10 min, do it on your lunch break

 

You don't understand the circumstances! I'm working at cedar point with my wrestling team, we are getting driven up.

Personally, I'm not to knowledgeable with working on cars.. But could someone point out a guide for my car? I have look around with some bad results..

 

Not if you've never done it before.

Gotta remove the headlight & headlight bracket to get at it.

Sometimes the headlight is a bitch to wiggle out.

OP, work on it some night after work. Take your time, and make sure to disconnect your battery before messing with the MAF sensor.

 

^valid point, the annoying thing is getting the worlds smallest phillips head into there so I can get the screws out.....

 

Hey guys,
So last night me and my dad tried to clean the Maf...

Remember, I have an injen cai that was on the car when I bought it. Basically, the sensor is not hooked up, or missing. The one wire just dangles there.

 

There is no maf sensor !!!!!!!!!???????????????? How is your car running without one?

 

i think i read somewhere is that it goes off of a memory when the maf is gone lol ...

uhh get an MAF