Let me see if I've got this straight. You have an auto salvage (junkyard) Mach 1 4V mod motor that's been sitting around for about 3 years, or so, and the salvage yard guys say it was in great shape when they "tested" it out. How am I doing so far? You basically changed the oil, and added some fuel injector cleaner to the gas tank, and fired it up, correct?
First mistake; believing anything a junkyard mechanic tells you!
Second mistake; buying a junkyard motor and putting it in your car without tearing it down first to see if it is truly in "great shape." At the very least, it should have had a compression check of all 8 cylinders, and a leak down test.
It definitely sounds like there might be something wrong, and white smoke usually indicates water in the cylinders, blueish smoke would be an oil issue, bad rings or valves, and black smoke is indicative of a fuel burning issue.
2003 Torch Red Ford Mustang Mach 1 5-speed
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