Quote:
Originally Posted by andrewwynn
Do this test; get close to the point it will limp mode and coast for a while then WOT and see if you can go a little faster.
If so, look into the vacuum accumulator hardware. Several instances of this being the culprit on diesels. Usually a big enough failure that it happens without towing and just going up hill steep enough. Possibly you have a small leak that only causes a problem at high enough engine load
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This worked! I went out a little earlier and got to just about 95, let off the throttle for a second then floored it again and got up to 115 before I just cut it off for fear of doing something stupid. Put it was pulling strong, no limp mode!
So, vacuum accumulator is that the vacuum reservoir? The black canister in front of the two boost controllers?