Hello everyone, I have a 2011 silverado 6.2L 4wd. I recently installed a 80mm ON3 turbo kit. It wasnt much of a kit, the only part that actually bolted onto my truck was the headers, I fabricated my own hotside, and had to go through ebay to finish my cold side and intercooler.

Symptoms:

I have a problem where the truck will not go past 2200-2500 RPM, when it revs to that limit, itll begin misfiring, the CEL will flash and traction control will come on.

Codes that get pulled up are, P0300, multiple cylinder misfire, and an occasional P0172/5, System too Rich Bank 1/2

I also hear a ticking noise that sounds like an exhaust leak, but no leak is present. I did a leak test using a smoke machine and pressurized air, and only had a minor leak after the down pipe, very minor. The ticking sounds like its coming from the engine.

I did a compression test today for all the cylinders, and they were all good to go.


What the setup consist of:
-60# injector upgrade
-340lph fuel pump
-Re-Pinned 2011 Camaro MAF
-New plug wires
-New TR7 plugs, went from stock .040 gap ac delcos, to .030 gap NGK, and still no change
-80mm ON3 turbo
-50mm ON3 BOV
-44mm ON3 WG

What im thinking: Seals blew out on the new ON3 Turbo, but i hear the BOV valve going off, so im not too sure. Broke/bent valve/spring/pushrod. Maybe a Crank relearn, since we had to calibrate my actuators for my AC to work.

I honestly dont know im stumped. Me and my buddy have been using a tech 2 to try and diagnose the issue. Please help us, I come to you guys before i either get rid of this damn turbo kit and engine.

Video to demonstrate:

 

Sure your Maf is all good to go? I know when I re-wired mine for the ls3/7 MAF, it acted funny like that! Would pop loud and sound line backfiring, not at 2500rpm, but it did it until I had it tuned/re-calibrated for that new MAF....

And the ticking you're hearing now is more than likely due to the headers you put on it. You'd be surprised how loud the valve train gets on these motors, just from a header swap!

It's gonna be something simple! Maybe the injectors? I would go back over everything you did... And honestly you didn't do that much, motor wise! Injectors, fuel pump, and MAF. It's going to be one of those things that's ******* it up.

 

Yes i was initially at the dyno, and the MAF was programmed and ready to go, but the tuner said since i acquired the MAF at autozone, that it wasnt good enough, idk, I thought they were all the same.

Weird thing, ran a vacuum test on the whole turbo cold side, and i had 0 leaks, but the truck according to boost gauge and tech2 is not passing 1psi of boost its always -20, and balances out to 0 while driving.

Thank you for the reply!

 

And the most important question; Is it tuned? So it never got tuned, due to these symptoms?

It very well may not be making 1psi of boost with multiple misfires and only barely making it to 2200rpm... For some reason I thought the factory MAF on those years were good for some boost?

First thing I would do is out the factory MAF back in it and go from there. Flash the factory tune back on it, if that doesn't work then you know it's not the MAF.

 

Is your truck a flex fuel? If so, those factory pumps are good for 600whp all day long.... On gas!

That's another thing you may have to eliminate as being the problem! Like I said, you really didn't change that much stuff... And if the truck ran fine before the turbo kit, then it can only be a handful of things causing your problem!

 

Yes he tuned it to run properly with the new maf and added air flow. I was going to go back for a retune on the dyno after i had fixed a bad spark plug, but even at that with no tune i dont think the truck should bog down at that rpm range and begin misfiring/knocking like crazy.

 

You're right, it shouldn't be running like that! Did you drive it to the tuner? Was it running like this before he recalibrated the MAF?

 

Yes my truck is flex fuel. Yeah youre right, might have to start putting stock components back in order to find the problem

 

I drove it to the tuner, but wasnt running very well on the stock MAF, and it would give me the same symptoms. I honestly thought it was because the injectors needed to be tuned, but i went to the tuner, and had injectors and new maf tuned, but it still running like this, got a little worse since i cant even go passed 2500rpm

 

It's going to be something simple! If it were me, I would make sure all my plugs and wires were good, flash the stock tune back in it, put the factory MAF in it and it should run fine! And make some boost.... Now at that point, if it still runs that way, it would have to be the fuel pump... You only changed a couple things, and if for some reason it happens to be the 340lph fuel pump doing something crazy with the factory FPCM, then just leave the factory flex fuel pump in it! It's good for 600-650rwhp all day.