While driving down the road I think the turbo quit working. Now the car struggles to maintain 70mph on the interstate. and fuel usage has gone way up.

The car still starts easily and idles smoothly, and there is no smoke.

How do I diagnose the issue?


Thanks,

__________________
Chris Young

Current cars:
1978 240D 4-spd manual 99k miles
1987 300TD - 132k miles
1987 300SDL - 280k miles.
1996 Subaru Outback - 132k miles
2003 Chevy Silverado Duramax/Allison - 195k miles

"My wife thinks I have a disease..... I think I have just inhaled too much diesel exhaust .... My neighbors think, well, who cares what the neighbors think"