Hey there,
My name's toby and I've recently (monday 4/12/10) purchased a 1984 spx 4x4 with the 4d55. it seems to make full power down the highway, but smokes black when into the turbo, also doesn't seem to rev up very fast when starting out. Taking off from a stop on a slight incline is do-able but seems like it should have more power down low. also, mileage at 70-75mph for long periods of time (6hrs) only netted 17.5mpg. What I have observed is what I believe to be an exhaust manifold leak at the cylinder head. would this explain the poor mileage? vehicle only has 114k on it. any ideas would be greatly appreciated. I'm new to diesels but I'm an old hat at gassers. I'll tell ya though, I already think I'm becoming a convert! something about this truck just speaks to me. I have zero post-purchase remorse and I'm looking forward to dialing in my new baby.
thx in advance for any tips/advice/theories sent my way.
toby in flagstaff