08-10 SS Turbocharged General Discussion Discuss the 2008 - 2009 Chevy Cobalt SS Turbocharged. On sale since the second quarter of 2008.

Possible boost leak or bad turbo?

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Old 08-03-2016, 08:26 AM
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Possible boost leak or bad turbo?

When I WOT the car sounds like it has a boost leak but it's not throwing any engine codes. It deffinately does not go ***** to the wall like it has in the past.
I did puncture a hole in the radiator fan body but I don't think that could be the problem.
How do I know if my turbo is going bad?

I know there's a lot of questions but I don't know what to look for and what could be the problem.
Old 08-03-2016, 08:27 AM
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I also noticed this when I got under the car. It looks like it was cut. Any idea what this is?
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Old 08-03-2016, 08:35 AM
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Looks like a bpv line going to the vacuum tank
Old 08-03-2016, 08:49 AM
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Yeah it looks like the nipple broke off. Definitely could be your issue.
Old 08-03-2016, 10:46 AM
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it looks like the vac line to the lower charge pipe. Mine broke off a while ago. have to replace lower charge pipe. If you look at your photo you can see the the stem in the line still. Your going to throw a code, it doesnt happen right away but it will happen. Took me a few days to a week of driving before I saw a code.

This photo was taken from underneathe the car looking up right? Take an above photo looking at the same vac line. You will see a pin hole next the to connector on top of the lower charge pipe I bet.. So basically you have a boost leak.
Old 08-03-2016, 11:02 AM
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Joe is right in thought it looked like the vac tank but it seems more likely to be the one going to the chargepipe
Old 08-03-2016, 11:08 AM
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Time to replace with ZZP lower CP. I had this exact issue on my Lower CP and it threw a code eventually.
Old 08-03-2016, 01:36 PM
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Damn. I wonder how that happened. Will I need a new hose line as well?
Old 08-03-2016, 01:43 PM
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if you can get that plastic nipple out of the line, then no. but I got a new line just in case.
Old 08-03-2016, 01:49 PM
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Is there s how to on changing the lower charge pipe? Is there a quick fix other then buying the lower charge pipe. How hard is it to change the lower pipe?
Old 08-03-2016, 01:54 PM
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its a pain in the ass.

I cut my zzp charge pipe in two and used a silicone coupler to make it easier.
Old 08-03-2016, 02:08 PM
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Son of a b****. I am trying to sell my car tomorrow and want to get it fixed
Old 08-03-2016, 02:18 PM
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Try and find someone selling a stock lower CP. it still sucks to install but it should be cheaper.
Old 08-03-2016, 02:23 PM
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That's a good idea... Do I need a whole new charge pipe because they plastic piece broke off in the hose?
Old 08-03-2016, 02:30 PM
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Is this what I should be looking for?
Old 08-03-2016, 02:52 PM
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The zzp pipe was pretty simple to install for me, taking the stock pipe is easy but it's a pain to move around to take off. You shouldn't need a new line just take the plastic out if not I'm sure it has enough lag to cut that small portion and connect to new pipe
Old 08-03-2016, 03:32 PM
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Okay I will see what I can do. Thanks for the input. And you guys are pretty sure that this is why I'm having boost issues?
Old 08-03-2016, 03:37 PM
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you could probably get the plastic stem out of the line by screwing a screw into the opening of the stem and yanking it out lol. If theres enough slack you could probably trim it. Try the screw part first. You may be able to tap the stock lower charge pipe you have with a new brass barbed stem as long as nothing else looks horribly cracked.

Probably best to replace tho.
Old 08-03-2016, 03:38 PM
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Originally Posted by aebooth6
Okay I will see what I can do. Thanks for the input. And you guys are pretty sure that this is why I'm having boost issues?
not a single doubt in my mind
Old 08-03-2016, 05:07 PM
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I trust all you so I'm going to buy a new lower charge pipe. Thanks everyone
Old 08-03-2016, 06:49 PM
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Does the vac line suck or blow air? Or does it only sensor the boost?
Old 08-03-2016, 07:23 PM
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Originally Posted by aebooth6
Does the vac line suck or blow air? Or does it only sensor the boost?
I'm not quite sure. I'd guess it's gets pressurized when your in boost
Old 08-08-2016, 11:23 AM
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Originally Posted by aebooth6
Does the vac line suck or blow air? Or does it only sensor the boost?
its designed to pull air from your lower charge pipe to help close the BPV. It goes from lower charge pipe, to the boost solenoid on the intake manifold to the bpv.
Old 08-09-2016, 02:24 PM
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This happened to me. Drilled and tapped the LCP and got a hose barb mounted in it with RTV around the threads and the top. Thing PULLS now. No CEL for me and I was driving over a month. Couldn't figure out why it wouldn't boost after doing a few highway pulls and the bpv would open at 15 and drop to 10 and fluctuate between 10 & 15 at WOT. Fixing the LCP was easier for me than buying a new LCP because it's my daily. Took about an hour and a half to do and I needed to go to a plumber outlet for a 1/8" hose barb. I was able to remove the lower charge pipe plastic thing and took it with for size reference.
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