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Message: <blockquote data-quote="Silversn95" data-source="post: 1437881" data-attributes="member: 10515">Ok guys, I have an odd rattle sound coming from the engine on my 94 5.0 and having a hard time figuring out what it might be.  For some background info, the mustang has 168,000kms. Engine has never been torn down by me, owner the last 15 yrs but I do not know the history before I bought it.  I suspect  one of the previous owners added nitro at some point since the throttle body has a hole drilled in it were the clean air duct attaches to the housing.The engine also suffers from pinging if I don't pull the timing back to at least 8 BTDC, even on 91 octane fuel.  Not sure any of this explains the rattle sound.Regarding the sound, this is the odd part, I only hear it when the engine is at operating temp.  At cold start, no rattle can be heard.  I have fulled the plug wires in sequence while running to see if the sound changes  and there was no change when any of the plug wires were disconnected.  I have also removed the front drive belt to see if it might be a pulley but other than finding out my power steering pump and idler pulley are noisy, it had no effect on the rattle sound.  Actually made it more clear to hear it without the accessories running.Things that have been changes over the last couple years:1. water pump/ thermostat2. HB - original had separated.  Current one still looks good.3. EGR valve. Changed to see if it would stop the pinging... it did not.4. had to change a couple leaking fuel injectors but this was over 10 yrs ago.I have a video but do not know how to post it.Thanks in advance for any help.</blockquote>