ticking / rattling noise under acceleration / cold start
I have a ticking noise during cold start. It is really hard to pin point but it seems to be coming from the rear of the engine almost like at the exhaust manifold. I can hear it pretty well under the car, and if i put put my head at the rear of the car. it goes away when the car warms up a little roughly about the same time the sucking sound from intake as a result of the gutted airbox. Not sure if these sounds are even related but under light / moderate acceleration I will hear ticking once more. I don't really hear it under very light accel unless the my boost reading is between -5 and 0. Under moderate acceleration I will have a rattle almost like a rattling heat shield on a muffler, or small rocks rattling on metal. It'* really hard to hear these noises once the blower whines. Not sure they exist anymore with the blower whine. In neutral when I race the engine I don't hear any of these noises. Engine sounds normal apart from what I think are noisy injectors (only noticeable with hood up). another question I had is are the injectors supposed to be semi noisy ? Thanks in advance.