Is anyone getting a CEL saying something about "Internal PCM malfunction" ? I've gotten two or three times in the passed two weeks and am curious if anyone has gotten it and taken their car to the dealership for a new PCM or reflash..

I'm also curious, is anyone still not hitting the advertised 12.5psi on their broken in CSS? I've got about 6k miles and never really payed attention to my gauge...but @ WOT 80mph it was just barely past 10psi (not even to the next marker line after 10)....I feel jipped here.

 

Tempeture plays a big part on your boost level, I'd bet that it is the hot Houston weather that is preventing you from seeing 12 psi. Also, I only ever see 12 psi right before redline, for only a few seconds before shifting.

 

There's a reflash available for the P0600 series of DTCs related to falsely detected hardware errors. (but there are other symptoms and complaints this reflash addresses)
This affects the 2005 model LSJ equipped Cobalts only
I suggest you take it in to your dealer
HTH
WOT

 

I had the dealer re-flash my 2005 SS with the new updates.

First start up in the morning is much smoother, and overall idle quality is improved.

 

Hey guys i dont know if you can figure this out for me but i usually run 80KP wich is 12PSI i think... Ever since its been freezing outside ive been getting 95KP on my dial. So I think it makes a HUGE diff. My car has much more power at zero degrees. I wonder how much PSI that is??

 

100 kPa = 14.7 psi
therefore
1kPa = .147 psi
so
80 x .147 = 11.76 psi

Puts a new slant on Canadian arctic high pressure front!
WopOnTour

 

Altittude plays a huge role also. With stock pully the stock gauge said 10 PSI. When i got my new gauge it only read 6.5 PSI. Now with a 3" pulley i'm getting a solid ten in second, more in third.

 

Wow... thats wierd... with stock pulley and gauge I can bang out 12.5lbs on the dot in any gear (assuming 1st... to short to look though) By 2k I am hitting 10lbs maxing 12.5 around 4k. (This is all at or very close to wot)

Is that common or?

-Rich

 

FYI The stock gage (and your boost control system for that matter) is corrected for altitude. It "zeros" against existing barometric when you turn ON the ignition.
A mechanical gage doesnt do this, generally you are only concerned with how much pressure your making above your baro-zero not referenced from sea-level
WOT

 

Its not mechanical its the intercepter one that reads the computer so it shows what the computer reads. I would guess its closer than the stock one.

 

Hmm interesting, I'm wondering now what the Interceptor is zeroed against?
static TMAP?
static SCIP?
static BARO?

Gonna have to PM ForceFedJunkie to find out...brb
WOT

 

Interceptor just gets the PSI from the PCM like autotap does. I imagine it's the same number as the boost gauge just in digital format.

 

Well I KNOW it gets it from the PCM.
But boost is generally a "calculated" PID not a direct PID off the J1850 (Class 2) datastream. Typically (as in most other boosted GMs like the 3800 sc) it's calculated by taking the current/existing MAP pressure minus corrected BARO pressure as viewed by MAP and stored at IGN On. Think of it as PID1-PID2= displayed boost on the TECH2

But the LSJ has a seperate BARO sensor so there's a possibility the Interceptor gage is using the static TMAP (the LSJ unit is called a TMAP because it includes an intake temp sensor) value at KeyOn not the value from the stand-alone BARO sensor .Another possiblity is the static SCIP sensor at key on, so there is potential for a discrepancy is all I'm saying. The stock gage is merely a pulse width modulated output signal from the PCM, not a Class 2 PID.
I have PMd ForceFedJunkie (Todd at Aeroforce) to find out what they've done.

WopOnTour

PS> What's an Autotap?

 

Thanks! so that gives me an extra 1.2 pounds wich brings me up to 13.2!

 

Curious, do you have a K&N CAI by any chance?? (Hoping that the new reflash might rectify the MIL as well)
WOT

 

I'd also like to know Cody, if you had the re-flash done w/ the intake on at the time (providing you had one @ that time.)

 

I don't have an intake yet.