Like it says. When I start up in the morning it sounds like a deisel engine. It stops when it is fully warm or is quieter anyways. also when accelerating it sound like a v-tech only real quiet or if not doing that than sounds like a train. It is not loud though. It gets faster with your speed/rpm.
#47183, "RE: engine mak'n funny noises" In response to Reply # 3
Yeah my 1G talon did that before i rebuilt it a long time ago. Its a 4g63 but same basic idea. thats my best guess also. I would do a full tune up and change your fuel filter and o2 sensors. (or at least the front o2)
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