Ford Fiesta car will not start but battery ok can not rev over 4500 rpm tic tic noise from engin

You say battery is o.k , what voltage does it have ?

Its a 12 v battery it would not start today even with booster pack nor bump start but all lights come on and radio they do not dim when trying to turn engine over the start it just a dull click

Lights and radio coming on mean nothing towards battery condition . They are all initially 12v batteries but wanted to know what voltage yours was showing now .

sorry just had battery tested and all ok and alternator ok had diagnostic check said accelerator sensors to high and also to low . this was at Halfords but nothing else car will not start with out booster pack and not all the time and still will not rev over 4500rpm

Sounds like they are saying the TPS ( throttle position sensor ) and / or throttle body or wiring are faulty which could cause lack of rpms. They cannot find the cause of non start ................................. crazy !!!!!! You would have been better to get it scanned wit Forscan They should also have checked to see what draw the starter motor was taking in case bad

thank you will try book it into garage to see what they come up with

yes garage sorted it Halfords were crap. Battery was not good but also prob with starter relay from turning key to starter motor. also had a lose wire that needed replacing. witch was draining power from battery. all good now. the throttle position sensor re corrected itself after new battery was fitted. forscan was done before and after and now all is running how it should be . Thank you for help

Good you got it fixed , thanks for the update . Using the right people , tools / scanners is always better and cheaper in the wrong run . Halfords .....................................