I went to the track for the first time ever. My HHR SS has always run hard as **** and kicked ass till I got on that track today.

Initially it ran hard till I got up to 5500rpm in third gear and then it drops boost down to 5psi. and
When I turn the car off and back on it resets itself and then goes back to the same crap as I run hard again.

Code: 0299 pops up.

I have a Trifecta tune and all hahn upgrades. All of this has been on the care for about 6 months and never really given me an issue.
I think my clutch may be slipping a little, but I don’t think this is reated.

Things seem to be getting worse because now it does this in second gear too.

All clamps seem to be tight as I have checked all of this.

Any idea what I should be checking for??

 

Wastegate Actuator or Boost Solenoid has gone bad would be my guess.

 

popped a clamp on a coupler, crack in your intercooler...

It's either a boost leak, or your boost bypass solenoid has gone bad!


I got that same code, when I cracked my Synapse Intercoooler

 

I agree with cracked intercooler, if you hear a "whoosh" or "whisting" sounds when you try to boost. See thread titled, "Annyoing story I guess..." in the General section.

 

Check BPV diaphram for tears and douple check all of the chargepiping and vacuum lines.

 

I took the car in to the dealer and the found nothing.

I also contaced Vince/Trifecta and he sent an updated tune. I'll be installing it to see if it fixes the issue.

I do hear a woosh sound at times, but not all the time. How do you test your intercooler for leaks? I have a HAHN i/c, I hope it didn't crack already

 

You honestly just need to take it off.... My synapse cracked on the TOP of the cold side endtank, almost impossible to see unless you take the bumper off and feel around or look at it.

It's not a tune issue.... either your BPV solenoid failed or you have a crack/ leak somewhere!

Like I said I got the exact same code, and the exact same performance with the car that you are having.

 

Thanks, I guess I'm going to have to opener up this weekend and check everything out. I installed the new Tune and same thing happened.

Is the "BPV" on the side of the turbo? The white cap with the three screws?

 

Yes there is a rubber diaphram inside of that!

 

Hmm.... Don't mean to thread Jack but would a cracked intercooler cause the boost flutter that I'm experiencing????

Let us know if you get it fixed

 

it would cause a flutter if it's leaking... a crack means it won't build any boost really... except under really heavy loads

 

P0299
Turbocharger Engine Underboost


Diagnostic Aids


P0299

The ECM detects that the actual boost pressure is less than the desired boost pressure for greater than 4 seconds continuously or 50 seconds cumulative.

• The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.

• The intake air pressure sensor signal circuit is pulled high in the ECM. With the sensor disconnected, at ignition ON, a normal voltage measurement of the signal circuit with a DMM is 5.60 volts.
• The CAC is connected to the turbocharger and to the throttle body by flexible duct work that requires the use of special high torque fastening clamps. These clamps cannot be substituted. In order to prevent any type of air leak when servicing the ductwork, the tightening specifications and proper positioning of the clamps is critical, and must be strictly adhered to.
• Use a solution of dish soap and water in a spray bottle to pinpoint any air leaks.

 

I remember when the nut on my wastegate arm came loose the p0299 code popped up.

 

I still have this 0299 issue, I took it in to the dealer and their dumb asses can't find the issue.

The dealer doesn't sell the diaphram for me to try that. Where can I buy one?

 

The bolts are alittle bigger than they should be that are near the piping and they can go into the piping and thats what your problem might be and i would change the bolts

 

Im having a similar problem, i drove my car earlier today and gave it a couple little runs through second and third gear. Well tonight i was driving home and i got on the throttle a little expecting boost like normal and nothing. So i got into 2nd abou 25-30 and went wot and it only bluit 5psi of boost. Any ideas whats up. There is no code that came up just no boost. I quick look at charges pipes and everything looks to be on tight. I was having problems with a sensor a little bit ago with boost/ the bypsass valve etc.

 

I dunno, my car seems like it's loosing torque.... Some times if feels fast and other times it doesn't. I still boost 20-21 psi but I seems when my car hits full boost sometimes, it just doesn't pull hard like it should. Any ideas as to what would cause this? or is this normal with a turbo car? It's not heat soaking because the cold side of my intercooler is ice ice cold to the touch. Could it be a dirty maf/ bad maf, lower map sensor hitting the ac, or what?

 

car normally runs at 22 or 23psi but on occasion it will not go above 5psi and feels like im driving the girl friends vibe... wtc all the charge piping is tight, i have had a crack in an intercooler before and this is not the same type of experience as when that happened, any other ideas???

 

MAP sensor or IAT sensor error?

 

no errors come up no lights go on from the dash board

 

That actually doesn't mean anything. You can have a DTC without a Check Engine Light. Trust me I know.

Get codes read at Autozone or similar. Might help us out in diagnoses.

As for the only boosting 5 psi. It's usually been a leak in the charge piping, intercooler or at the MAP sensors.

 

will do... hasnt done it since friday :-(

 

all of you that cant seem to go above psi that have the GMS1 check the sensor on the cold side piping... seems to have issues with people running AC and it getting on the sensor.

 

stupid car started doing this **** again, I replaced the bpv for $300 at the dealership and it ran great for a month, started doing the exact same problem again and now its showing a code, I saw on another thread about this issue and posted in there when I had the bpv changed out but now I cant find that damn thread, any help would be greatly appreciated im about done with this car, I don’t even have any significant mods that would cause issues of this magnitude

 

Make sure the waste gate actuator rod adjusting nuts arnt loose.