Hello everyone i have a 2009 cobalt ss tc. i have a hahn intake, charge pipe, intercooler and exhaust. when i take off i am pouring blueish smoke out the exhaust and when i shift it pops sometimes and gives a nice cloud of smoke. i am also running the following DTC;
P0303, P0403, P0200 and occasionally a P0003. if any one has any idea on where i can start it would be so greatly appreciated. thank you so much hope to hear from anyone

 

Honestly it sounds like your piston rings are toast.

You need to do a compression test.

p0303 is misfire on cylinder 3. I bet you that piston is toast.
p0200 is injector circuit malfunction
p0403 is EGR circuit malfunction
p0003 is fuel system regulation malfunction

You probably went lean at one point due to fuel issues.

 

i forgot to mention that i did do a compression test and cylinder 1 was at 100psi where as 2,3, and 4 were at about 125-130 what would i need to do with the egr and fuel stuff thats where i confused, thank you for quick reply

 

Ok. 100 psi in cylinder 1 is not good. It should be no more than 10% difference across the board. the others seem ok.

Drop a small amount of oil in the cylinder 1 to see if it improves, if it does then you know its rings.

The fueling issues are more than likely due to a failing fuel pump or bad fuel injectors.

I dont think the LNF has an EGR valve but dont quote me on that.

 

ok i can do that, i just had the fuel pump recall performed where they replaced the fuel pump module. i didnt think there was an EGR valve either thats why i am confused. so you think it could be injectors and rings?

 

Yeah that one has me stumped. I have no idea where an EGR valve would be. I thought maybe it was referring to the PCV system but I digress

Sounds like fuel pump or fuel injectors. You just had a new fuel pump put in?

Was it the high pressure or low pressure?

 

Well im not exactly sure if they replaced the pump or the module. i can look at the work order and see what it says.
is the low pressure the one in the tank and the high pressure sitting on the intake mani,
what would you reccomend me starting with

 

Yeah the low pressure is in the pump. and the high pressure is the one on the intake manifold.

As for the fueling issues. Check the fuse first to make sure its not blown. Then after that check to see if the wires are frayed and are touching the block or anything.

Then make sure they plugged the fuel injectors back in.

Is the car running?

 

alright yeah i could start with the fuses that is the big thing, now my problem is i have no idea where the injectors are or how to get to the wiring to check it and make sure all is good you know.
yes the car is running it runs fins except for when it bogs down a little and then it misfires

 

Injectors are under the intake manifold unfortunately.

 

weird that an egr code was thrown, the car has no egr valve

 

yeah the EGR code is throwing everyone off. so now dumb question do all the injectors have their own plug or is it like one to the rail?
so i would have to remove the intake manifold to check on the injectors. how hard is that and i would have to replace gasket?

 

Intake manifold is easy. takes about an hour to do. I would replace the gasket just to be sure. its only like 20 bucks.

The fuel injectors are on a rail.

 

alright thats not to bad then, i could possibly look into that later today or this coming weekend. ok i know they are on the rail but do they each have their own electrial connector?

 

Negative.

 

sorry ya lost me negative meaning what. i guess what i saying is woulc the cylinder three injector be unplugged thus causing the injector circut and the misfire in cylinder three or is it that it only sends power to rail. Im confused

 

The injectors don't have individual plugs. Misfires could be plug related too.

 

alright then i can take a look. welli just repalced plugs and the only thing i could think of is maybe wrong temp plugs but wouldnt that happen to all cylinders?

 

He's not at our altitude, his numbers are kinda low. The 100 is def low and there is an issue

Thread with compression info
https://www.cobaltss.net/forums/2-0l...ession-205149/

 

Yeah but as long as they are over 100 and within 10% of eachother they are fine.

 

so do you guys think all of my cylinders are lower then normal or what?

 

at sea level they ideally should be in the 150 to 160 range.

Here at my altitude my Compression test was 125 on all 4 cylinders, as was Ecaulks when we did his.

but it can vary depending on a lot of factors. I wouldn't worry about the other ones. Like I said as long as they are above 100 and within 10% of eachother they are fine.

its the Cylinder 1 that is not good.

 

alright cool. so your saying i should start by adding a little oil to cylinder one and trying test again to see if it restores to 125 area?

 

Yeah. pour a small amount, maybe a tbl spoon of it directly into the cylinder and then do a compression test on that one. if it increases compression, you know the rings are shot on that cylinder.

 

ok i can do that this weekend as well. quick question about the fuses when you say make sure its not blown which one would be blown and in what fuse panel passenger side foot well or the under hood?

oh and also for the rings if i find that cylinder one is shot would i just be able to replace all the rings and be good or what would i have to do??