You happen to know I live like 30 mins from Indiana...... If you want it looked at log wise i can do it no charge just shoot down to me.

 

Did it start right after the Trifecta tune? If it did, it's the tune. I had similar issues with trifecta on a HHR SS auto. Vince straight up, stopped emailing me while we were trying to fix it. A bone stock car, nothing in it but a drop in K&N and he fucked up the tune. $ wasted for the customer cuz Vince didn't finish it. He kept trying to tell me to diagnose a problem, but I have HPtuners as well and there wasn't a problem. Besides the HHR I was working with was brand new with like 4k miles on it. I think it has something to do with the BCM/ECU communication on an auto trans with the LNF. I don't know why it does it. Load the stock or the GMS1 tune back on and see how she runs. Take the trifecta tune off completely and chalk up the loss of $ to a learning experience and have someone HP tune you. Trifecta was the benchmark about a year ago +/- but now they are like every other canned style tune it seems like.

By the way, just a suggestion, next time don't waste the time on the aftermarket stuff if you car is running like crap before. It can actually compound the problems due to increased airflow skewing MAF readigns, causing messed up AFR and all sorts of nonsense. But hey, now that you have it all done... you have an awesome foundation to put a stellar tune on and rip people new ********.

 

exactly

Everything I have done hasn't improved a thing....thats what makes me feels like it's more of the PCM now....


Also checked all of the wiring/soldier connections the other night. Removed all of the wire covering and electrical tape....everything looks top notch.....and is extra tight.


And this happened way after I installed the Trifecta...like 2 months after

 

Have you tried to reflash bot tunes? Also when did you tune it? Winter blended fuel can be vastly different than summer, also winter temperatures suck... My car, for example, runs like rotten dog **** if its colder than like 35-40 degrees. I live in Southern California though so it hardly ever gets that cold. If you have a tune on your car it could be the weather/condensation from moisture (snow/rain) that is causing your issues.

 

Haven't tryed to reflash either of the tunes yet...I think this will probably be my next move. The car ran fine...up until the end of October. It was warm...all the way through the end of November...

 

I will post again. (I live close to indiana ) If you want me to look at it i will let you know whats the deal. Just let me know. And im not promoting myself, im just helping you so no worries.

 

This OP is by far the truth. Alot of other tuners on this forum will debate on this because there beliefs are that winter tunes and summer tunes dont differ. But I and some other tuners know this to be a dipshit call. So if i were you id look into the tune and try to meet up with me so i can look at it. I am sure i can figure the issue out quickly!

 

Yea dude... Load the stock tune back on... bone stock, not GMS1, see how that works. The stock tune parameters are alot more forgiving than a tune with very specific performance specs.

 

This owuld be great if we could do this. Let see if we can possibily plan something. I wish the weather would hold out a little longer....looks to keep getting colder and colder...


Would it really be that easy though? I asked Vince from Trifecta about it...and this is what he had to say about loading the stock tune back on:

"In any event, the dealer won't know how to put you back to stock. Once the GMS1
upgrade is performed, their computers are updated to show the GMS1 tune is the
stock tune for your car. Plus, they'd have to undo the modifications they did
to your wiring and sensors - something else they won't know how to do. You can
ask them, though."

- Vince Geglia
Trifecta Performance, Inc.

 

just reload the gm stg 1 back on and see if it fixes the problem.

 

I WISH there was a way I could just a brand new harness in....then I could just buy the "plug-n-play" GMS1 harness....that way....there wouldn't any loose connections at all...

That would 100% rule out the GMS1...(minus the tune)

 

Well u can now they have the plug and play now.. you can get a new harness. But I plan on coming to indy again for a real winter tune for my guys there. So if you want is be happy to look over your hhr.

 

Where could I get a new harness? Probably a GM part? Also...would it be a PITA to change the harness??

 

It'll be easy as long as you know what Ure doing (mechanically inclined wise) harness is gm or salvage yard.

 

Getting the car reflashed tomorrow. The dealer thinks this "should" fix it. Crossing my fingers here........

 

Someone let me know if this makes sense.

First off, it's an automatic.

If I give it part throttle...the boost hits about 15 psi...and basically falls off unitl I let off....(again just part throttle)

If I give it full throttle....it pulls like crazy...and holds boost just fine.
Is that how these cars are supposed to run??

 

Did this solve your concern?

Sarah
GM Customer Service

 

subd

 

The dealer was not able to get me in today.

BUT I did do some test runs earlier...and posted above with a few more questions

 

i don't have an auto but if i give part thorttle and then give full throttle i won't build full boost because there is less load. but we're talking only a couple psi not 10.

 

Doesnt sound right at all. Sounds like a botched tune. basically it sounds like someone set your wastegate to fully close immediately and produce boost. I remember my first tune was like that and it made driveability a big issue for daily driving because of all the torquey jerking around.

 

As a Customer Service Representative, I am unable to answer technical questions or try to diagnose over the internet. However, I can assist in working with dealerships. Please, if you would like, keep me updated on how things go with the dealership. If you would like further assistance send me a private message.

Regards,
Sarah
GM Customer Service

 

I know, with my 08 SS GMS1, Ive had 2 separate occasions where the lower MAP sensor went bad... most likely due to the connectors the kit came with allowing for the New England road salt and slush to get in. Both times replacing the sensor fixed the problem. After the second time I finally got the dealer to solder the connections. My car would run okay, and then intermittently hesitate and run rough... especially at very light throttle.

 

I wish someone could explain to me HOW a tune can just act up after 2 months of it working perfect.

 

File corruption. It could even be a faulty ECM. It's probably going to take a while to figure out.