I have a 2015 Sonic ltz. I was driving through the canyon going up hill when it randomly went into a limp mode. I eventually got it out and was able to get it home with very little power, it just seemed like it was building no boost but no CEL.
Drove it the next day to see if it fixed itself and no luck. However the cel did come on throwing p0299 under boost.
About a month ago, I had the valve cover replaced by dealer due to the membrane being torn.
I looked in the intake manifold recirculation line? That goes from the manifold back to the turbo and that rubber valve seems like it's still there. It's all black and dirty in there so that's why I say seems like it.
I took the turbo out to see if I could find something wrong and it is cracked around where the flapper seals. I know people say this is common and okay, mine is worse than the pictures I've seen online however it's probably not enough to build zero boost.
The exhaust turbine spins fine but I did notice a bit of polished aluminum around the turbine making it seem like it's hitting the housing. The turbine fins all look okay. I've read that if the exhaust turbine wobbles too much that can be an issue and cause under boost, but how much is too much. It does wobble without a ton of force but not to the point that the turbines smack all sides of the housing. Only a couple turbines touch this one spot if oriented in a certain way.
The center portion of the turbo where the oil line connects is filthy inside, it has a bunch of tar like oil and the banjo bolt is terrible as well.
I don't know how to inpect the compressor turbine without a bore scope or at least see if it even spins.
Could the center housing being gummed up be my problem and cause it to have such little power out of nowhere? Could cleaning out this center housing and the oil feed banjo bolt help and solve this?
If not, what else could it be or should I check. I can think of what would make such a drastic drop in power out of nowhere. I don't have a boost gauge so idk what it's doing.
I checked the manifold bolts and they all seem tight along with all the charge pipes. Boost regulater solenoid also seems to be functioning correctly when I blew through it and checked it with the battery.
Drove it the next day to see if it fixed itself and no luck. However the cel did come on throwing p0299 under boost.
About a month ago, I had the valve cover replaced by dealer due to the membrane being torn.
I looked in the intake manifold recirculation line? That goes from the manifold back to the turbo and that rubber valve seems like it's still there. It's all black and dirty in there so that's why I say seems like it.
I took the turbo out to see if I could find something wrong and it is cracked around where the flapper seals. I know people say this is common and okay, mine is worse than the pictures I've seen online however it's probably not enough to build zero boost.
The exhaust turbine spins fine but I did notice a bit of polished aluminum around the turbine making it seem like it's hitting the housing. The turbine fins all look okay. I've read that if the exhaust turbine wobbles too much that can be an issue and cause under boost, but how much is too much. It does wobble without a ton of force but not to the point that the turbines smack all sides of the housing. Only a couple turbines touch this one spot if oriented in a certain way.
The center portion of the turbo where the oil line connects is filthy inside, it has a bunch of tar like oil and the banjo bolt is terrible as well.
I don't know how to inpect the compressor turbine without a bore scope or at least see if it even spins.
Could the center housing being gummed up be my problem and cause it to have such little power out of nowhere? Could cleaning out this center housing and the oil feed banjo bolt help and solve this?
If not, what else could it be or should I check. I can think of what would make such a drastic drop in power out of nowhere. I don't have a boost gauge so idk what it's doing.
I checked the manifold bolts and they all seem tight along with all the charge pipes. Boost regulater solenoid also seems to be functioning correctly when I blew through it and checked it with the battery.
