Date registered: Jun 2006
Vehicle: 1981 123 300D
Location: Hunsville, AL USA
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
huge drop in fuel economy 1981 300D
I am brand new to this forum. Wish I had found this forum long ago!!!
I have a 1981 123 300D with 355,000 miles. Highway fuel economy had been at 28 mpg and in town at about 24 mpg for the last 10 years. Fuel economy has been dropping steadily over the last two years and is now at about 20 mpg highway and in-town.
Any thoughts on the problem and solution.
Air filter is new, fuel filters have about 6,000 miles on them. Doesn't seem to be a loss of power on the road. The glow plug light operates properly. The only noticeable new engine quirk is that the engine runs very rough when cold starting in the morning but smooths out after about 15 seconds. And over the past year I have experienced that the engine won't always shut off from the ignition. I have to pop the hood and shut if down manually.
Thanks in advance