Looking for some help on this guys I noticed last night while I was pulling my car into the garage when I would let the clutch out in first gear I heard what sounds like a rod knock, as soon as I push the clutch in the knock went away. Letting the clutch back out to move the car brought the knock back. I got up this morning when the engine was cold started the car up I want behind the car and sat behind it for about two minutes listening to the exhaust every now and then you hear a pop not sure what bank it's coming from and I've noticed when sitting in the car the car sometimes shakes, like if you unhook gas supply to a cylinder. The car was completely cold in both instances, now that the car is in the garage you still can hear a faint knocking sound with the engine just idling. Car has 300 miles on it running premium gas from Shell. Any help would be much appreciated thank you to all.

 

Bring it to the dealer and have them look at it. PM Deysha as well and she should take care of you.

 

If you hear a knocking sound at idle, clutch engaged (foot off) and not in gear, than you are hearing 1 or 2 things. One could be clutch throw-out bearing just floating around a little at the low idle speeds without any load on it, and second would be the input shaft on the transmission spinning.

When you press the clutch pedal, you remove both of these things from the equation, first by loading the clutch throw-out bearing not allowing it to float around anymore, and second, stopping the input shaft since the clutch disc is disengaged and no longer spinning the input shaft on the trans.

As for the rough idle, I'm on my 3rd Mustang 5.0, a 2011, 2012, and now a 2014, and all three have experienced rough idle with a cold engine, especially so when the outside temp is below 70F and/or high humidity.

 

Need data logging software. Watch knock sensor voltage and timing, see what is going on. I haven't gotten a software package yet but I had VAGcom with my Audi and diagnosed many issues with it. I'll make some posts once I get the car and software set up... Surprised I haven't seen any threads on this site already