Check the fitting on the back of the intake manifold that connects the
plastic line to the alda as well as the banjo fitting on the line. When
this is clogged, your performance will be slow on the m617 turbo. Also, if
this does not help you, there is a switchover valve on the firewall on the
driver's side. The line from the alda goes to this valve and then goes to
the intake manifold. You can bypass this switch by connecting the lines
together and sometimes that will help your performance. Those valves do
fail and cause poor performance. A well tuned 617 turbo should not have any
issues getting up to highway speed. I assume you have performed the routine
maintenance such as valve adjustments, diesel purge, etc.
Mathieu Cama
At 12:17 PM 6/22/2005, you wrote:
My 420SEL gets 19 around town and 22 on highway. My 300SD gets 25 MPG.
Over all the 300SD is slow compared to the 420SEL and I have thought long
and hard about replacing the diesel with a gasser just so I can merge onto
highway.
Regards,
Trampas
