hey guys. I lost the second engine in my lnf at 139k. car was running k&n intake, zzp fmic, catless zzp downpipe, eBay exhaust and trifecta 91 23psi tune (I know, kills engines) . I put the third engine in recently (fully dressed with turbo) and ever since I have not been able to come into boost sensibly. first run I hit 12 psi on stock tune and 12 psi in trifecta. slow coming into boost, reduced power?next run ran 12 psi and dumped all boost at like 6k rpm.. no boost in second gear. ever since has been hitting a shitty 12psi but will dump boost at wot at about 6k rpm.. I did the vac tank bypass mod to find no help. I eventually re routed my bpv to the IM, and capped off the lower cp line and instantly made 23 psi in my trifecta tune. now I've only ran the car for 2 runs like this but it seems to be holding boost strong all the way through. does this mean my bpv solenoid is cooked?? thanks!!

 

Yes it seems like that was the issue. But a more important question is, u are on ur 3rd engine, u know trifecta tune probably broke ur last one and that it kills engines, why the heck would u keep running that ****?

 

hehe oops. I just love running my balt at 23psi. I bought the car for cheap and I just have fun with it as a second vehicle. my dd is a 2013 speed3. so think if I buy a new solenoid all will be fine?

 

Psi has nothing to do with it. People DD 25psi HPTuned Balts. Trifecta is trash.

 

ok so now we're off topic but i do know that. I traded a blown up snowmobile and some cash for the car, used it as a winter vehicle. the previous owner lost the original engine and replaced it, and I drove it for 8k and popped the engine that was in it. i replaced with a 2010 engine, new clutch, and already had 4.05lsd swap. ever since it's been running like **** and I'm trying to figure it out before I throw money for a tune at it... I don't really drive it much this time of year, and if I can figure out the bpv solenoid in question here I planned on having it hp tuned.. I know trifecta is garbage..

 

BPV solenoid is annoying. Just hook BPV to intake manifold and unplug the vac line from charge pipe and plug the hole in the cold side charge pipe. Boom bye bye any BPV solenoid issues.

 

its not the 23 psi, its the trifecta, their tunes are ****. get a 23 psi hptune from a good tuner on here. it will make more power and it will be a lot safer than the crap trifecta gives you

 

what does running like **** mean? what does it do?

 

A properly tuned cobalt that runs well would make you want to drive it more. I've been on 25psi tune for years with no issue. Hpt tuned by 09cobaltss.

 

I really do understand but if you read above, the tune was done prior to sale. I don't have the cash to throwing questions and tunes at it right now. I just want to get it running right.

I read people getting oil blow by?? hence the only reason I haven't just done this.

read original post please. slow coming into boost, only made about 12psi. another run no boost basically. finally, it started to boost to about 12 psi (100 kpa, drop to 80, hit 100 again up and down up and down) but would dump my boost at like 6k while doing a WOT run. just been running like bullshit in general.

I loved my balt with the tune. I really plan on going hp just not until I figure the damn car out. can I run it without the solenoid or should I replace the solenoid. thanks

 

No oil blow by. That's another problem.

 

so fully safe to run no bpv solenoid?? just cap lower charge pipe line, and run bpv to the im?? and I'll be fine??

 

Yeah. Highly unlikely as the IM and BPV should not be coated in oil.

 

awesome. thanks a bunch. I guess I'll be running with no solenoid!

 

You do it yet? How's it workin for ya?

 

You don't need it.

 

hey!! I bypassed the solenoid. I drove the car for about 50 km, I hauled like a train. last night my car started surging on idle and only made about 100kpa on boost.... I had VERY low fuel though. like about to break down. think if I put some fuel in the tank the car would act differently?

 

Depends how low the fuel was, I mean my car doesn't do that at the low fuel dash notification level. Try unplugging Evap purg solenoid to see if it's causing problems?

 

hey! so I forgot this post existed and I just made a new thread. my car will work when the ecu is reset. makes 23psi in tune and about 17 in stock. after 20 mins of driving it makes low boost low power. I just ran outside and took off my evap purge solenoid, and could blow threw it fairly easily. what will happen if I just unplug it as you said?

 

Check your map sensor wires and make sure they're not grounding out.
I had a problem where mine was grounding out (didn't know) and when I would clear the codes it would boost normal but after that limp mode after a while

 

where and how was it grounding out? mine slowly starts to lower boost. like today we did four runs , three runs I drove and one my buddy brad did. when we parked, brad hopped out for a smoke and was going to get a video of me coming past in second from a 40 roll. so literally just did 4 runs, and as I'm doing this one.. what do you know, boost didn't go over 17psi after this point and about 9 in stock tune. drove for 15 minutes and boost and power were noticeably reduced . went home, reset ecu and checked my evap purge solenoid by blowing through it. I went for a ride a couple hours later for about 50km and it never lost a thing.. this is really weirding me out