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Black oil, low power, 6.5liter 1995 GMC problem

4527 Views 7 Replies 5 Participants Last post by  cnctech
This is my first post. What a great site!
I very recently bought my first diesel, a 1995 GMC 3500HD 6.5liter turbo flat bed. I know little about diesels, so I have a few questions.
I changed the oil after having it about a week. The old oil was as black,
as coal, and stained my hands like it had carbon in it.
I checked the oil after probably 1000 miles and it was three quarts low, with no leak being noticed.
Other conditions are:
The power output is low.
The vacuum pump locked up after I had driven it about a week.
The check engine light comes on often for about five seconds.
The fuel mileage is terrible.
Starts fine.
Mileage is 170k miles.
Oil pressure is 40 psi warm running, 20 psi warm idle.
Did I buy a dog?
Thanks for any help you experienced fellows may have.
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Hope your doing ok with your 3500 hd .i love mine i have a 1997 but i aint scared to jump in .paid $12,000 with 80,000 miles put $4,000.00 in new tranny and case,driveshaft balanced (twice).new rear yoke,dust cover,new motor mounts.mounts broke in mine and craked tranny(be sure to look for)ii whould spend another 4,000.00 if i need too.but this is me dont know much about diesels always had gas is past.if not afraid and have some cash to blow,keep the truck.if your strapped for cash and dont like to turn wrenches,and dont like to read you might sell truck. Remember hd means biggerrrr, larger,more money . Working on my brakes about a week ago,one of my employes beat on my tire for two hours and chould not get off. I got home and beat for 5-10 minutes with a larger sledge hammer and finally kicked off.still having prombles with anti lock system.good luck plantmanspc.yahoo.com
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