2.0L LNF Performance Tech 260hp and 260 lb-ft of torque Turbocharged tuner version.

Slight Engine Knock?

Old May 27, 2013 | 02:30 AM
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Slight Engine Knock?

So for about a week I've noticed a slight engine knock. The car runs fine and there is no CEL. The gas mileage is fine also. This knock only comes on when its idling at temps of 190-198 F and when I back out of a parking spot. I'm completely stumped right now.

I'll post a video tomorrow morning of the sound.
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Old May 27, 2013 | 02:46 AM
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Does it sound like an intermittent tapping? When was your last oil change, did you check your oil level, etc? Does it only happen around startup and go away after engine has been running for a minute or so?
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Old May 27, 2013 | 12:23 PM
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Ticking Noise/Knock Video by Crap2Crap | Photobucket

Vid 2 Of Knocking Video by Crap2Crap | Photobucket

VIDEO0016.mp4 Video by Crap2Crap | Photobucket

Last edited by JetLAGG; May 27, 2013 at 12:27 PM. Reason: First time posting a vid on here.
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Old May 27, 2013 | 07:02 PM
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that sounds like something is viberating on the last one. the other ones sound normal. could be ur tranny or just something viberating. u got stock tranny mounts? go under and make sure everything is bolted on good. iv had a bolt come loost that wasn't tightened on my altinator
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Old May 28, 2013 | 02:02 PM
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Yea, i did what you said any my charge pipe for my piece got loose and it's vibraiting on the front frame. Last night tho.....



CEL CAME ON AND NOW IT'S SAYING P0011!!!

The car runs fine and doesn't have a rough start. I took to autozone and it went away when I started to drive for a little bit. It was on all night yesterday and this morning going to work...then all of a sudden it went away. What's going on??? Should I replace a sensor or something?
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Old May 28, 2013 | 02:43 PM
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Originally Posted by JetLAGG
Yea, i did what you said any my charge pipe for my piece got loose and it's vibraiting on the front frame. Last night tho.....

CEL CAME ON AND NOW IT'S SAYING P0011!!!

The car runs fine and doesn't have a rough start. I took to autozone and it went away when I started to drive for a little bit. It was on all night yesterday and this morning going to work...then all of a sudden it went away. What's going on??? Should I replace a sensor or something?
Found This
https://www.cobaltss.net/forums/2-4l...11-vvt-280522/

Possibly your intake cam selenoid or actuator.
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Old May 28, 2013 | 02:47 PM
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P0011-Intake Camshaft Position (CMP) System Performance

You're an LNF, right? Give me 5 minutes, I'll get your the rock auto part number. Cheap, takes 2 minutes to change.
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Old May 28, 2013 | 02:56 PM
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Eh, don't have the receipt here on my laptop, but the actuators are sitting on my desk at home. I'll grab the part number for you tonight.
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Old May 28, 2013 | 04:41 PM
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Cool, thanks man.
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Old May 28, 2013 | 07:15 PM
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I replaced both. Got them from tom at CED, 37 bucks each

Camshafts

Bottom of the page, you'll see intake and exhaust. Seems like the intake is the one that usually starts being a problem first.
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Old May 28, 2013 | 09:18 PM
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You may think the car is running well, but you may also be surprised at how much smoother it runs when you replace these parts. They sit on top of the engine, between the cams just left of the spark plug coils. Just unplug the wire, remove the bolt, and swap them out.
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Old May 28, 2013 | 09:22 PM
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Also worth mentioning that I don't believe replacing these will do anything about your tick. At the same time, I couldn't hear anything out of the ordinary in your videos. Sounded like the usual loud-ass injectors with the metronome-like tick of the fuel pump.
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Old May 28, 2013 | 10:03 PM
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Thanks guys. I just ordered. Hopefully it will be here once I'm back from the my gf's brother's wedding.
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Old May 28, 2013 | 10:07 PM
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Also, is this covered by warranty?
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Old May 28, 2013 | 10:23 PM
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No idea, but why did you order them before you find out?
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Old May 28, 2013 | 11:22 PM
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Originally Posted by JetLAGG
Also, is this covered by warranty?
Tough call there. Depends on whether or not you consider the cam actuators "internal". Or really, whether or not GM does.


Powertrain Coverage
In addition to the 3-year/36,000 mile protection, many of your powertrain components are protected even further with coverage extending to 5 years or 100,000 miles, whichever comes first.

Engine

Engine coverage includes all internally lubricated parts, engine oil cooling hoses, and lines. Also included are all actuators and electrical components internal to the engine (e.g., Active Fuel Management valve, lifter and oil manifold) cylinder head, block, timing gears, timing chain, timing cover, oil pump/oil pump housing, OHC carriers, valve covers, oil pan, seals, gaskets, manifolds, flywheel, water pump, harmonic balancer, engine mount, turbocharger, and supercharger. Timing belts are covered until the first scheduled maintenance interval. Exclusions: Excluded from the powertrain coverage are sensors, wiring, connectors, engine radiator, coolant hoses, coolant, and heater core. Coverage on the engine cooling system begins at the inlet to the water pump and ends with the thermostat housing and/or outlet that attaches to the return hose. Also excluded is the starter motor, entire pressurized fuel system (in-tank fuel pump, pressure lines, fuel rail(s), regulator, injectors, and return line), as well as the Engine/ Powertrain Control Module and/or module programming.
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Old May 29, 2013 | 11:30 AM
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Direct injection is loud in general. The HPFP is very loud also. I thought I had an issue similar to this after my commute home. I'd let it idle for a bit and it would make a loud "ticking-like" noise randomly. It ended up being be the HPFP, I was also on the stock tune though with no access to logging (could of been on it's way out?). Cam Actuator fix sounds promising.

Wish I had time to learn the car, one of the reasons I traded it in was due to my lack of understanding + no time to do it..bummer
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