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1.7 sdi surging!!! unable to solve it


davej
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Hi all having major problems with my lupo sdi. When trying to maintain a steady speed there will be a slight power surge than it will drop back and moments later it will happen again, making it impossible to maintain a steady speed!! The car idles ok it only happens when diriving. My brother a former mechanic has changed the fuel filter, air filter, new injectors, and done a diesel purge in an attempt to solve the problem with no luck. The current thinking is it may be a faulty throttle position sensor or crank shaft position sensor .Anyone got any ideas ?? Its getting to the point when i'm seriously thinking of giving up and sending it to the breakers! thanks dave

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