Loud noise from under driver side valve cover

[Woodm42]

Ok long story short, my car was throwing these Codes P0018, P0316. (Crankshaft Position - Camshaft Position Correlation - Bank 2 Sensor A, Engine Misfire Detected on Startup -first 1000 Revolutions) so I had new cam/crank shaft sensors put in. Then the car was cranked with the passenger side sensors unplugged. Then the guy proceeded to crank the car, which it cranked fine and ran fine. Then the car was revved up, once it got to about 4,000rpm’s it started making a loud ticking like noise from under driver side valve cover. The sensors were plugged back up after that, but noise still there. Car cranks fine and idles fine and is throwing no codes. Since the noise started, the car has only been cranked and run for about 15 seconds but does not sound good at all. Scared to let it keep running. But I took the cover back off and inspected everything and can see nothing wrong at all.
any ideas?

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[sk47]

(Crankshaft Position - Camshaft Position Correlation -

Hello; I mostly wish to follow the thread in order to learn. My initial take is codes for correlation does not indicate the sensors are necessarily bad. Might mean they are not getting signals out of sync with each other. Timming gear, timing gear sprocket missing a tooth. Chain tensioner failure.

I am also curious what others think of starting the engine with sensors unplugged on one side.

I have a wild idea but will save such for later as i have no confidence in it.

Best of luck

 

[Woodm42]

Maybe will get some good input on here. The car was running perfectly before was just throwing those codes. Car has 29,000 miles my head I’m think can’t be nothing to serious but I don’t know. It will crank perfectly fine and run correct with no codes. Just have the tapping sound or what ever coming from drivers side

 

[Woodm42]

What’s your wild idea I’m curious to hear it?

 

[Coyotebawl]

How about a sound clip of the noise your hearing ?

 

[sk47]

What’s your wild idea I’m curious to hear it?

Hello; A year or few back there were some threads about problems with the chain tensioners on Coyote engines. Some posts with pictures to help check if parts were in the proper place. My take was if the tensioner(s) allowed slack the chain might jump a tooth.
There are a few threads of owners finding a tooth or two broken off a timing sprocket gear i the oil pan. The cars continued to run even with a tooth missing.

My wild idea (an idea not to be taken seriously without more evidence) is a chain has jumped a tooth, or a tensioner is slack and the timing is off a little. Maybe just enough for the top of a piston to "kiss" a valve. ( as I said a wild thought not supported enough so far)

That said there are other parts in the valve train of an overhead cam engine. The actuators which advance & retard the camshafts using oil pressure.
In a pushrod engine I would pull a valve cover for a look at the rocker arms. Had a hydraulic lifter fail in such an engine which resulted in a distinct noise on one side of a V8. I replaced one lifter and fixed the noise. The old lifter was not pumping up. I am not sure the overhead cam coyote could have such a lifter problem.

I guess my thinking is based on an idea that the initial issue was not one of the sensors having failed more that when the engine rotated, they were getting a signal out of an expected sequence. In other words, the sensors may have been working properly but some mechanical thing was causing a rotating assembly to be out of time.

 

[Woodm42]

How about a sound clip of the noise your hearing ?

How about a sound clip of the noise your hearing ?

How about a sound clip of the noise your hearing ?

 

[Mike Pfeifer]

With the valve cover off, turn the engine by hand and see if anything looks suspicious?

 

[Woodm42]

With the valve cover off, turn the engine by hand and see if anything looks suspicious?

I have done that, I can’t see anything wrong. Everything looks good far as I can see and feel

 

[Timbuck]

Pull injector fuse and spin it on the starter might help isolate where it is maybe. Or hold it flat to the board and it go into clear start mode and not start.
But in this instance pull injector fuse and 100% it will not fire.

 

[Woodm42]

Pull injector fuse and spin it on the starter might help isolate where it is maybe. Or hold it flat to the board and it go into clear start mode and not start.
But in this instance pull injector fuse and 100% it will not fire.

I will try that pulling the injector fuse, may be able to see something when the engine is turning over

 

[Coyotebawl]

Just from listening to the video , it almost sounds like 'maybe' your primary chain is slapping the guide ? Hard to say though from just listening to the sound clip .

 

[Mike Pfeifer]

Agree with above, sounds like something mechanical going on, maybe spinning it faster will point it out. It is probably also the cause of those fault codes you initially had as well. Take a good look at the chains and guides. Does it look like the timing is correct, at least by eye? Maybe one of those phasers is bad.

 

[green97probe]

Is there any abnormal lobe wear on the camshafts? Do any of the followers feel loose?

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