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My other half has a Ford galaxy mk1 which i'm led to believe has a VW tdi engine.It has a couple of annoying faults which are.

1. Engine sometimes fails to start and needs jumping.

2.It will run perfectly and then the speed will gradually drop off and wont do more than 50mph flat out.

Any ideas will be much apprieciated.
 

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sounds like the battery or alternator are at fault to me, get your hands on a multimeter check battery voltage start the car and then check voltage,

batter voltage with engine off should be 12.5 -13v and with the engine running you should see 13-14v if much lower then there is your problem
 

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if it struggles to do 50mph on a flat sound like maf may be knakered disconect it and see if it drives any better. you could get it scaned to see it any codes are stored
 
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