My 2003 Duratec DOHC
has some oil around the upper intake plenum (where it bolts to the lower). I see this on both front and back (up under the intake plenum). We just had the car serviced (oil change and coolant flush) at the dealer at 102K miles. I didn't notice this oil there before. Is that a place where it might leak oil? If so, would the upper gasket set correct the issue? I was thinking of doing plugs and possibly wires (is that necessary at 100K) as well if I have to remove the intake plenum. Do most people replace just the upper gaskets or do they do lower as well? My lower ones don't appear to be leaking anything but won't be able to tell for sure till I pull things off.
If you have 100,000 miles on your plugs, it's definitly time to change them. I am getting ready to change my plugs, and maybe even the coil packs. I'm waiting on the 2004 Service Repair Manual so I have all the right torque specs. My number 3 cylinder is misfiring, so I am going to change all the plugs. I will be pulling the upper intake manifold for sure. I am going to inspect and clean everything. I might even pull the lower intake manifold as well. If it isn't too much trouble, then I will have cleaned everything, and installed fresh gaskets. I even went and bought a new torque wrench today, since the one I had grew legs and walked off. Actually I think I let someone borrow it, and I don't remember who.
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