Hello, my name is Mark and I will try help you with this.
What is the road speed and engine rpm when you select 5th and 6th gears?
60mph revs 3 or just over and the more i put my foot down the worse it gets
from fourth up in to 5th and then if i go in to 6th it gets worse
What engine do you have?
di or dti
Sounds like you are coming off the turbo.
Does the van pull ok if you go through each gear on hard throttle and keep boost on?
what do you mean by that
If you accelerate hard through each gear does the van pull ok?
yes until you get to 5th and 6th gears
But for 6th gear you need to be going more than 60mph to keep the turbo on boost.
properly just getting to 70 75 but what about 5th
It depends on how you are driving.
5th and 6th are really for economy and fuel saving.
as i go up through the gears changing when appropriate everything is fine till i get to 5th and 6th then it starts to shuder
I think you are losing turbo boost.
That is hard to say.
think ill just leave it
There is obviously no fault with the engine because it revs ok in the other gears.
It must be getting fuel ok
It would appear the boost is coming off.
yes i know that
Have you ever felt turbo lag?
Is that what it feels like?
It sounds like it from your description.
What you need to do is get a scan tool that can display live data and have someone look at the boost pressure and fuel pressure when you are driving in those gears to see if any are dropping off.
Why rate poor service
i dont feel i have been given a solution or a comprehensive diagnosis. sorry
I have told you what you need to do next; look at live data. That's what we would do in a garage.
Would you rather I told you to replace the turbo and it would be a 100% guarantee fix.
And then if that didn't work, replace the fuel pump at another £1000.
You might not like the answer but the service was not poor.
You have had me for 45 mins.
Do you work for free.
You have a good day.
i feel it was im very sorry i knew it would need work at a garage and no i dont work for free.
I think you will end up fitting a new pump and turbo.
got to go cheers
And the garage will do what I said. Stick it on a scan tool and road test live data.
So not poor service.
keep doing what