'99 E-350 7.3TD noise
Hello. I'm looking at a '99 E-350 Van (chateau) 7.3TD w/ 139k miles. It seems to be in nice shape, but I noticed a distinct noise (rattling) after a short test drive. It can easily be heard over the actual rumbling of the engine. At idle, it is coming from the driver side in the engine area. The owner claims it is a loud vacuum pump and it has its own exhaust right near there. Would this make sense or should i be more concerned? Thanks!