2011 EXP LTD BD 06/02/2011. 1000 miles.
Burnt oil smell during hard acceleration. This is easily repeatable and
happens every time.
Well now we have another confirmed issue with my LTD. Under hard accelerations
coming from an on ramp and merging with fast moving
traffic only. Other wise, all you smell is the new leather in the cabin.
Accelerating normally, no smell. You have to accelerate at 3500 to
5000 rpm for this to occur. A/C is on, does not matter if climate is
set to "recirculation" or if set to vent outside air. If anything, it is
more acute if vent is set to "recirc".
I am assuming the vent door blend system on this vehicle is operated via
vacuum created by the intake manifold and piped through the firewall
to a distribution block some where under the dash. As it takes a couple
of seconds for the doors to move when changing climate settings.
If this is true there could be an issue on how the vacuum lines were
run during factory assembly, or a bad one way vacuum check valve
causing some of the crank case fumes (intended to be recirculated
back into the intake manifold to be re-burnt as part of this vehicles emissions solution),
to enter the vacuum tubing being routed to the cabin for blend door operation.
But even then, there would probably have to be a loose vacuum tube somewhere
under the interior's dash to allow the fumes to leak into the
cabin air.
This only occurs under hard acceleration when very high amounts
of vacuum are generated by the intake manifold.
Of course, I could be way off base and blend door activation could be
electrically driven, but most car makers use a vacuum system, and
have not had the opportunity to discuss this with the
service team yet, but will tomorrow when I take in to have the suspension
popping noise diagnosed. Apparently they will need to keep it all day for
that, so they can also take a look at the vacuum line routing,
check valve operation and the EGR tube routing to see if every thing looks correct.
I have found during searching this forum, that others have experienced this
also. But have seemed to write it off as the vehicle just burning off some
under coating over spray or something vague like that. But if that were the issue,
you would smell it all the time once the vehicle systems warmed up to operating temperatures.
And the smell should be much less when not venting air from the outside of the vehicle and
somewhat more when climate control is
set to "vent" and you are venting air from the outside.
We will have to see what the service team can come up with.
:mattmoon:
