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2011 CTS coupe engine or injection pump knocking

4411 Views 6 Replies 6 Participants Last post by  tinman
2011 CTS Coupe Spun Rod Bearing 1600 Miles

Hi - I have a CTS coupe with the 3.6L VVT DI engine with 1600 miles. When we first picked up the car in December, you could hear knocking in cold weather at idle. It took a couple of trips to the dealer, but they did find a fuel line that wasn't fully seated in a clip. After the fix, the knocking noise was far less noticeable, but my wife still heard it on occasion. Unfortunately he dealer was unable to reproduce the noise and my wife just decided to turn up the radio.

Last weekend, I was driving to Atlantic City for the Strictly Corvettes show (at interstate highway speeds) and I hear major knocking noise. I pulled over and called Onstar as I thought the engine threw a rod. Onstar ran a diagnostic and found no problems and indeed oil pressure, water temp was fine. I decide to turn around and limp home. I leave the car at the dealership, but I made a video (with sound obviously) of the engine knocking loudly at idle.

Monday morning, I go to the dealership, and the head of the service department, one of their mechanics and I start the car. At first the guys thought that indeed the engine threw a rod, it was knocking so loudly, but after listening more closely, the mechanic thought that it might be the injection pump.

Has anyone experienced a similar issue? What do you think that I ought to do if there is internal engine damage? Thanks for your input.
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Im dealing with this issue right now 96k
2011 cts4 awd. Really nice clean car. Was driving heard a loud pop car stalled.. got it to start went bout two miles wouldnt start again told the finance company to.come.get it its done figured I blew the timing... few weeks later it was written as charge off. I was post. So it was sitting in fowerville.. 5 months keys in it. They refused to get it. So its got a lean on it Did some digging figured if Its a simple.fix
So battery was dead. Replaced
Starter smelled charged . HE REPLACED that and fly wheel.
So them it started but with a weird knock.thay dose go away and speeds up with acceleration .. got a p0303 so figured tune up ect . And system to lean Indeed cyc 3 had some build up on spark.. replaced all 6 . Did a check .
After those replaced. Got a code for System to one
Went in and took out injector 3 . It looked clogged as well .. after checking that all lifters were good ect..
So now I've got random.multiple cycleder misfire.
System too lean.
Thorttle.postion a
Map sensor

And the knock now dose come and go ..but I now lost all engime power.
He showed me all the buld up the lifter he replaced made noses when he shook it. But yet now lost engine power. .
He put so many hours in this for me
But he's over frustrated...
I can't use the car the finace company.already wrote it off. He keeps going over everything on this car . But all new parts and now more codes. Wth..
oh and oil sending unit oil change done ext ..
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