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

Turbo problem question

Old 01-02-2019, 12:06 PM
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Turbo problem question

So Iím buying a 2010 Cobalt SS Friday, itís from a dealership with pretty good reviews and the guy was up front about a problem it has, he said after about 15 mins the turbo stops working also stating that if you turn the car off then back on it will be like normal for another 15 mins. The other day he replaced the MAF and said now it goes longer but still cuts off, he add that who ever had it before him put an aftermarket inner cooler on it and relocated one of the sensors so question is what would make the turbo cut off after a bit then be fine once you crank the car again?
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Old 01-02-2019, 05:54 PM
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Start with a boost leak test. That could be a cause of it, assuming the code was a p0101 which made the tech replace the maf.

Also make sure a manual boot controller wasnt added without proper tuning.
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Old 01-02-2019, 06:57 PM
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How do I check for the boot? I have no idea what that is
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Old 01-02-2019, 08:33 PM
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My bad, I was on my phone and it corrected or missed the s in boost. So I meant manual boost controller.
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Old 01-02-2019, 09:54 PM
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Ha ha itís cool man and thanks I will definitely check that stuff out
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Old 01-02-2019, 10:03 PM
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Also post up pictures of the engine bay on here when you get it. That will also members on here to chim in.
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Old 01-03-2019, 12:23 AM
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Will do brother
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Old 01-03-2019, 12:57 AM
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When this happened to me, I would be able to spool but it wouldn't hold full boost. would hit 15 drop to 10, and repeat. then would eventually stop boosting. Turns out the nipple on the lower charge pipe that goes to the solenoid on the intake manifold was broken so it was letting the BPV open when it shouldn't have. So I'd start with checking vacuum lines of everything. If the MAF sensor is in the lower charge pipe it's gotta be tuned for it. Definitely throw up some engine bay pictures so we can do our best to identify things that look touched.
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Old 01-03-2019, 06:42 PM
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Does it surge or anything? Or just flat not work?
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Old 01-03-2019, 09:05 PM
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He said the turbo still spins but doesnít make boost after a little while then when you turn the car off then back on itís fine for a little while then same thing
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Old 01-04-2019, 07:11 PM
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Okay so I got the car, itís pretty dang nice but yea boost after about 5 mins of driving stay around 5 psi and I have an check engine light and the codes are

C0460
P0101
P0107

The first one is steering colum, the 2nd i know is MAF, and the 3rd is dealing with the map sensor. I also took 2 pictures... edit it wonít let me upload them
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Old 01-04-2019, 11:12 PM
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Upon further inspection it has 2 new MAF sensors, it also has ZZ performance intake (Iím assuming thatís what it is.. actually I will load the pictures onto my profile so you guys can view them for your opinion on what the problem is
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Old 01-04-2019, 11:21 PM
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You have a boost leak. Get that fixed first, dont replace another maf until you do.
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Old 01-05-2019, 10:24 AM
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Can I get this checked at advanced auto or a Chevy dealership?
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Old 01-06-2019, 01:56 AM
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I can tell you exactly whats happening here. only one sensor gets relocated, that's the maf. 20 bucks says the guy installed a blow off valve, relocated the maf and never tuned for the relocate, which means its getting a p0101 after 15 minutes because all the metered air is going out the bov. p0101 code will make the car go into a super rich mode and it will not boost. dealer didn't need to change the maf. here is what you do to fix. either get someone with hptuners to tune for the relocate, or put the maf back on the intake, im guessing there is a block off plate there, then put that block off plate on the lower charge pipe where the maf was, then check if you have a stock bpv on the turbo if u do, make sure its hooked up, if u don't, get one. and last remove the bov and block off the port, or get new upper charge pipe with no bov port. fixed

anyway that's what im assuming based on the relocated maf...or the 2 maf sensors apparently lol if there is no bov, then unplug the maf in lower cp and plug in the one on intake
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Old 01-06-2019, 01:59 AM
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Originally Posted by tomj77 View Post
I can tell you exactly whats happening here. only one sensor gets relocated, that's the maf. 20 bucks says the guy installed a blow off valve, relocated the maf and never tuned for the relocate, which means its getting a p0101 after 15 minutes because all the metered air is going out the bov. p0101 code will make the car go into a super rich mode and it will not boost. dealer didn't need to change the maf. here is what you do to fix. either get someone with hptuners to tune for the relocate, or put the maf back on the intake, im guessing there is a block off plate there, then put that block off plate on the lower charge pipe where the maf was, then check if you have a stock bpv on the turbo if u do, make sure its hooked up, if u don't, get one. and last remove the bov and block off the port, or get new upper charge pipe with no bov port. fixed
this is most likely the correct answer, but we need engine bay pictures to confirm. sometimes the BOV isn't always obvious, could be a forge VTA for all we know which doesn't need a special charge pipe or anything. but I agree, that's definitely the culprit. find a stock BOV (used most likely) and put that on. Or a forge if you're into spending money for little gains. Either way sounds like OEM BPV was removed and that's causing MAF to throw code then MAP can't read accurately when air is being vented to the atmosphere. While I'm not calling this car unsafe to drive, I'd definitely keep it out of boost until you get the problem fixed. PS tuning through HPTuners to fix this will be more difficult than throwing a stock BPV in and moving the MAF back to the intake tube. kids these days with their dumb mods...
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Old 01-06-2019, 02:05 AM
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yes we need pics to confirm or toss my theory. there is a good possibility if this is what happened, there was a tune for the bov and dealers, cause they don't know much, when they got the car, went ahead and flashed ecu back to stock and screwed it up.
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Old 01-06-2019, 10:46 AM
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Old 01-06-2019, 10:59 AM
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I can't tell where the mag has been relocated to? Where does it trace back to? The lower map sensor epoxied to the cold side charge pipe isn't good. The little screws that hold it in are bored straight through that pipe. If the screws aren't broke off in there already you need to run some in there because it will pull in unmetered air into that cold side pipe right around the lower sensor. I'm guessing the maf has been relocated into that pipe and it's not tuned for it like several have said.
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Old 01-06-2019, 02:18 PM
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Well I was wrong. Lol there are not 2 maf sensors there are 2 map sensors, which is what there should be . you have a cold air intake with maf moved further toward filter....should be fine. Id get rid of the intake and get a k&n . cold air get wet and mess with ur maf. There is a hood possibility you have a big leak somewhere. So do boost leak test. That plastic stock piping is known to crack.
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Old 01-06-2019, 02:20 PM
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Originally Posted by HellboundChevy View Post



who put on that lower map sensor lmao. Take that pipe off , take map out and clean that ****. Fricken globe of epoxy . I'm sure ur issues is in that general area from what I can see.
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Old 01-06-2019, 09:56 PM
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Originally Posted by tomj77 View Post
who put on that lower map sensor lmao. Take that pipe off , take map out and clean that ****. Fricken globe of epoxy . I'm sure ur issues is in that general area from what I can see.
You can literally see where one boost leak is just below (in the picture) the mounting hole.
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Old 01-06-2019, 10:23 PM
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I put a screw in it and nothing changed, Iím going to take the front bumper off tomrw at work and see if there is a problem with the IC but my mechanic buddy said itís probably a wiring issue or ECM since you can literally cut the car off then right back on and it holds boost for another 5 mins. He said the ECM is probably not letting it go to full boost but I am hoping this is not the case
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Old 01-06-2019, 10:24 PM
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Idk how/why the ECM would be at that state though itís only got 72,000 miles on it
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Old 01-06-2019, 10:35 PM
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Well I just found some useful information on here, apparently people who installed (some of them) cold air intakes were saying theirs ran like crap and it needed tuning because of how sensitive the MAP and MAF sensors are on these particular cars so that being said idk what to do precisely, I figure I need the stock SS **** back for it to run right IF that is the problem, correct?
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