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Discussion Starter #1 (Edited)
Just have a few things I noticed with the car that I was wondering if is normal.

When I stomp on the accelerator I will get some turbo lag, then the boost guage goes up to about 120 Kpa (17.5PSI) and then a few seconds will drop down I'll feel the car lose power than it would go back up, regain power, and so on. If I don't totally pin it I can keep a constant 80 - 90 Kpa (11.5 - 13PSI) without it doing this. I inspected my charge air piping looks alright, and I am not sure if this is even a turbo issue because sometimes during a cold start it will surge as I drive away and this time my car isn't using boost at all. Any ideas on that?

Also I noticed the oil seems to smell a lot like fuel, oil level hasn't increased at any amount that I could noticed though.


And lastly, I can hear an intermittent tick now, very light, probobly ever 2 seconds. Any ideas on that?

Thanks a lot guys for your time.
 

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How long have you had the car?
 

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I dont have those symptoms on my car. But i do have the ticking sound as well. My cobalt is 67623 miles 2008 ls
 

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Didn't answer my question, cars got 80K but how long have you personnally owned the car?
 

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Any news on this, tntorqu and Mastermosley?

Sarah, GM Customer Service
 

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Discussion Starter #8 (Edited)
Didn't answer my question, cars got 80K but how long have you personnally owned the car?
I personally have only had it for about 4 months now. 2009 Cobalt SS 2.0 LNF. The check engine light has never come on, and there are no pending codes, or history.

---------- Post added at 03:32 PM ---------- Previous post was at 03:24 PM ----------

I bought the car from a Dodge Dealership, wondering if maybe the previous owner tuned it. If there were any aftermarket parts on the car they were changed back to stock on trade in. Could a more aggressive tune, on a stock car cause the car to do this?
 

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I have a tick right when I start up cold in my 2007 automatic ss. I think it's in the rear of the car.

Btw your sure it's not loud enough to be a rod knock right?!? Mine definitely isn't and it in the rear.

Sent from my SPH-D710VMUB using AutoGuide.Com Free App
 

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Just have a few things I noticed with the car that I was wondering if is normal.

When I stomp on the accelerator I will get some turbo lag, then the boost guage goes up to about 120 Kpa (17.5PSI) and then a few seconds will drop down I'll feel the car lose power than it would go back up, regain power, and so on. If I don't totally pin it I can keep a constant 80 - 90 Kpa (11.5 - 13PSI) without it doing this. I inspected my charge air piping looks alright, and I am not sure if this is even a turbo issue because sometimes during a cold start it will surge as I drive away and this time my car isn't using boost at all. Any ideas on that?

Also I noticed the oil seems to smell a lot like fuel, oil level hasn't increased at any amount that I could noticed though.


And lastly, I can hear an intermittent tick now, very light, probobly ever 2 seconds.
Any ideas on that?

Thanks a lot guys for your time.
These two bolded lines are all very typical for the Direct Injection LNF motor so nothing is throwing a Red Flag due to these comments at all. The High Pressure Fuel Pump ticks very loudly under idle.. most people come to me all worried saying my cars about to blow up not knowing that its just my HPFP making the ticking noise lol

I'd almost have to place money on having some sort of vacuum or boost leak somewhere
 

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Discussion Starter #11
Yah I no the ticking for the pump, but the other tick is a real light ticking that ticks every 2 seconds or so like, tick....tick....tick.

But ya I was driving down the highway yesterday, stomped the accelerator in 4th gear at about 4000 rpm i had full boost by the time I hit 4800 I heard a pop and lost all my boost. Then I would stomp again and get maby a half a psi like I was loosing it all. Then after a while it would build up again.

Could this be related to a stuck open blow off valve, or the wastegate solenoid being stuck open? All my clamps seem pretty tight and there are no cracks anywhere I can see. How would I check the above?
 
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