Quote:
Originally Posted by deevel79
Hey Guys. I have an 02 I35, but since the maxima boards seem to get more views, i figured i post this here since its basically the same vehicle. For some reason, when im driving the car at low speeds, and the rpms are between 1800-1900 rpms, i get this annoying rattle from either under the car or engine bay. I was told that i could be the timing chain, but wouldnt it make noise all the time, and at any rpm? I was also told that i could be a heat shield, but i took it to a muffler shop and had it inspected. No loose heatshield. Everything was tight.
This noise ONLY happens in between the mentioned RPM's. Once i hit 2krpms, it completely goes away. WTF???
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Try lowering your antifreeze percentage in the coolant mix to around 25%Antifreeze/75% water. Most people have their mix over 50%. More antifreeze in the coolant results in higher cylinder head temps, which causes detonation. Antifreeze(glycol) is a poor heat transfer agent. More water results in better heat transfer and lower temps, therefore, pinging will be reduced. Each percent of antifreeze equals 1 degree rise in cylinder head temp. In addition, add Redline Waterwetter to help reduce the surface tension of the coolant,further helping with ping reduction, hence,the ECU will keep the timing advanced for more power and better gas mileage