The "tin can sound" might also be the idler bearings for the a/c belt or less likely a bad water pump, usually they leak before the bearings go in them though. Another remote possability is that one of the covers by the flywheel got bent and is hitting the flywheel or torque converter. The best way to find the source of the noise is to jack up the car safely and have someone run it while you search underneath. The timming could be way off or maybe the octane is very low, you are supposed to put 91 octane in. (See owner's manual for octane requirements) David Teitelbaum vin 10757 --- In dmcnews@xxxx, delorean502@xxxx wrote: > When I accelarate and my RPMs get around 2500 to 3500, my engine > sounds like a tin can with rocks in it. I don't notice any > performace difference, but the sound makes me not want to rev up very > high. Any ideas before I start to poke and prod around? > > Erik