car holding back
 

the car seems to lack power when it gets to working temp and on motorway the car suddenly surges and turbo kicks in properly,
engine management light comes on .the reading is a speed sensor so ive replaced both speed sensors but it still doing it.the speedo doesnt work neither does the mileometer
im at a loss .any help would be most apprechiated..
sorry for spelling and punctuation.
ste

ive done the key dance and got 2 codes 200.6 and 200.7,
my manual tells me nothing at all about them,
could do with some help peoples
ste

Please start with the basics, year-model-mileage. Is this a diesel engine?

Turbos do not kick in but spin up with increased exhaust flow from engine rpms. The only lag/delay a turbo has is when first starting out as the turbo has not spun up enough to generate any meaningful psi increase for more power.

model is a 2006 grand voyager ,milage unknown mileometer doesnt read and yes its a 2.8 crd diesel ,
the engine holds back on acceleration ,when the eml comes on you can feel the pull from the engine.
it feels like the turbo isnt doing anything until the eml shows.
Petrol engines im good with, diesels not so
ste

Try searching for codes expressed as follows:
P2006
P2007

Thanks for the reply,
ive looked up the codes and looks like some work on intake system,
ill have a look tomorrow .
thanks again very helpful
ste