# Engine ticking noise **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [July 18, 2012, 8:41pm UTC](https://community.cartalk.com/t/engine-ticking-noise/73602 "2012-07-18T20:41:43Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![allgoodcustoms](https://avatars.discourse-cdn.com/v4/letter/a/58956e/32.png) [@allgoodcustoms](https://community.cartalk.com/u/allgoodcustoms)\ **Post date:** [July 18, 2012, 8:41pm UTC](https://community.cartalk.com/t/engine-ticking-noise/73602/1 "2012-07-18T20:41:43Z")
Hello, I have a chevy cobalt and recently just upgraded the pistons and rods. I’ve driven it about 1k miles since the replacement and it just started making a ticking noise. It sounds like its up in the head. I’ve changed my timing chain tensioner bolt, also replaced the rod bearings. Everything lines up at TDC but around 2-3k rpm it starts ticking. I’m also getting a P0300 code. When I pop the hood I hear a leak somewhere but can’t find it. I’ve also tried using carb cleaner at the injectors to see if a gas leak was accruing, but nothing changed in the rpms. At this moment I am out of Ideas and need some help troubleshooting this. Thanks ---
**Author:** ![oblivion](https://avatars.discourse-cdn.com/v4/letter/o/3ab097/32.png) [@oblivion](https://community.cartalk.com/u/oblivion)\ **Post date:** [July 19, 2012, 2:21pm UTC](https://community.cartalk.com/t/engine-ticking-noise/73602/2 "2012-07-19T14:21:27Z")
-Why were the pistons and rods upgraded? -Was the valve train touched at this time? -Is the tick at about half the engine RPM (valve train) or faster? -How loud is it? -Does the engine run fine? ---
**Author:** ![Big\_Marc](https://avatars.discourse-cdn.com/v4/letter/b/9d8465/32.png) [@Big\_Marc](https://community.cartalk.com/u/Big_Marc)\ **Post date:** [July 19, 2012, 4:02pm UTC](https://community.cartalk.com/t/engine-ticking-noise/73602/3 "2012-07-19T16:02:21Z")
po300 is a misfire code just googled it and check the egr valve and the cam sensor can also be a coil or plug or an injector may be something simple left loose or disconeted . ---
**Author:** ![GSragtop](https://avatars.discourse-cdn.com/v4/letter/g/7c8e57/32.png) [@GSragtop](https://community.cartalk.com/u/GSragtop)\ **Post date:** [July 19, 2012, 5:29pm UTC](https://community.cartalk.com/t/engine-ticking-noise/73602/4 "2012-07-19T17:29:01Z")
Is it possible you have a clogged oil passage from when you had the motor apart, and the top end is running a little dry at RPM? ---
**Author:** ![allgoodcustoms](https://avatars.discourse-cdn.com/v4/letter/a/58956e/32.png) [@allgoodcustoms](https://community.cartalk.com/u/allgoodcustoms)\ **Post date:** [July 19, 2012, 7:16pm UTC](https://community.cartalk.com/t/engine-ticking-noise/73602/5 "2012-07-19T19:16:22Z")
alright so 1st post -I am supercharging my engine, the stock can only handle 250, these are stock compression just better material -no valve train work done -sounds pretty fast, but I can get it to not make the noise -semi loud, when the windows are down I can notice it, in the car not too bad -It feels a sluggish. I know there is a leak somewhere, just by the hissing noise it makes 2nd post I’ll definitely check those sensors, I did replace my spark plugs as soon as I saw the code, so those are fine 3rd post It may be clogged, I too thought something could be a little dry, but I did just take the valve cover off and grease up all the moving parts and it still makes the noise