When I bought my car it was running at 17-18psi. It had factory map sensors and began going into limp mode a few days after getting it home and then would boost 13-14 (stock from my understanding.) It now will only boost 13-14 and it does have a code for vacuum leak. Lines look good so I'm assuming it's because of my intake. The dealer I bought the car from only had it a couple of days so I don't believe this issue arose during their ownership. I'm curious if the previous owner had 3bar sensors and switched it back before letting the car go. I have got 3bar maps because I plan on getting it tuned but I'm curious if I were to put them in now if the car will go back up to the 17-18psi. Any thought on this?

 

Is there a tune on it at all?

 

That I don't know. The dealer knew nothing about the car.

But wouldn't it had to have bad something to be running 17-18psi

 

Wastegate harness

 

What's the code?

What I got out of that was you said you have a code for a boost leak and your noticing than it's making less boost.... Try fixing the code/leak and see where you're at.

 

Could you explain please?

 

I checked the lines and cleared the the code, it comes back after a little bit of driving. My cobalt friends tell me that with an aftermarket intake and no tune it will show the code I'm having. I guess I'm just confused because it was was running 17-18psi, would limp and then run stock boost. I would turn the car off, drive it again after awhile and the same thing would happen until eventually it only ran stock boost. I'm just curious of it's possible that if it once had 3bar sensors and then put back on stock sensors if this sort of thing could happen.

 

What's the code? And what intake is on it?

 

Stock tune could command 17-18 psi if the conditions were wrong enough.
An aftermarket intake if installed properly should not immediately cause a code. It could cause one over time by skewing the afr though.
If you had 3 bar maps on a stock tune as soon as you hit boost it would go ape **** because its not seeing the boost comanded

 

P2178 and I believe it has k&n typhoon

 

Ah, okay. Thank you for the information. I apologize for my noobness. I don't know much about these cars, or anything really.

 

Get boost leak tester and test it. It's most definitely not ur intake since ur intake is not part of the vacuum system. Unless u Ment intake manifold. Then again, boost leak test

 

P2178 is for fuel trims and you're running extremely rich. Do a boost leak check because thats always a good thing to do anyways. Then you need to figure out what tune is on there, find someone with HPTuners or buy HPTuners and contact one of the tuners on here

 

I'm going to have someone with a hptuner tune it. I will do a boost leak test and see if I can find anything. Thank you guys! Any other recommendations in the mean time are welcome and any common areas were leaks happen would be great also!

 

Fix all problems before getting a tune.

 

Bringing this thread back from the dead.

I built a boost leak tester and came up with no leaks. I still have the code. When I bought the car it was really cold but a 3-4psi difference because of the cold is kind of a lot, isn't it? Plus two of my friends, one with a '09 and the other with '10, weren't seeing any change is boost because of weather.

I emailed trifecta with my vin and they said it wasn't in the system and I will have someone with a hptuners be checking it out and hopefully be giving me a tune this weekend.

 

Well if you have no leaks then its probably because the PO traded the car in on a e47 tune or it was tuned for a different intake.

 

I actually just checked out your looking for a PO thread, do you still have that oil seperator thing connected to the PCV system? If its leaking there your trims will be all over the place. I also can't tell if its a K&N intake or a Dejon, either way it looks like its been painted and has a different air filter which would mess with your fuel trims bad

 

I'm sorry to sound like a noob, don't the injectors on the '08 need to be changed to run e47?

 

Nope. HPFP can make the adjustment in fuel volumes with an injector constant change. If the injector constant was left at the e47 value and 91/93 octane was ran then it would be off ~15% in your fuel trims which would set that code

 

Hmmmm, interesting. That definitely makes me curious. I've been trying to find the previous owner to get to know whats all done to the car. I bought it from a dealer who bought it from an auction. I've been running 91 since I bought it. Is there anyway to check without just putting e85/91 mix in?

 

have someone with hptuners pull the file. do you have a carfax so you can at least see what states it has journeyed through?

 

That's what I figured I would have to do. I did run a carfax before I bought it. It has been in MO it's entire life before I brought it to OK.


Also, if it were tuned for e47 and I'm now only running 91, would it have any issues running or be acting up beyond just the code?

 

If you think it was tuned for e47 then you have no choice but to get it logged. E47 is something like 15% more fuel. The fuel trims would be very off.

I live in Springfield mo if you want to make a drive to log it.

I do have HPTuners

 

It's a K&N intake, with some other filter on it, the intake wouldn't make it run rich, it would make it run lean.