ChancesDad96
New Member
Hello all, I am in need of some input. I purchased a 1998 Expedition 5.4 a couple months ago with 164,000 miles and found out it had no oil pressure once it warmed up good. I put a new melling oil pump in it and replaced the timing chains, guides and tensioners while I was there. Truck fired right up, pressure gauge shot up. Motor got to temperature, oil pressure dropped, came up, dropped came up about 3 times then went away completely. Shut the truck off restart it oil pressure gauge shoots up... So I replaced the oil pressure sending unit same thing...
As a side note I am also having a problem with the GEM. Not sure if it is connected,
Please help...
As a side note I am also having a problem with the GEM. Not sure if it is connected,
Please help...