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Thanks for the reply - I'll take a look under the hood. I have run 89 since the beginning and I don't get any detonation ping that I can hear, while driving at least. I'm trying to find time to have the dealer listen to it, but it doesn't always do it as loud as other times...

Hi, I've been lurking for a long time here. Almost bought a 2005 ST and still might buy a 2007/8 ST. I find this site invaluable! My question: I have a 2003 ranger 4x4 with the 4.0L engine. If I stand next to the right front tire area I can hear a sligh knocking/rattleing sound...