why does my car have to crank several seconds before starting on 1996 Jaguar XJ6

crank sensor, coils, plugs, and temp sensor replaced

Asked by for the 1996 Jaguar XJ6
seek a diag and est to avoid wasted $
1 more answer
Have the fuel pressure tested. If the pump or pressure regulator are leaking internally , then it needs to build up pressure each time , before it starts. Make sure the correct specs are used for referrence.DON'T replace parts , without testing/having tested , somewhere with proper equipment.Also have scanned and post code(s). Certain codes may be stored as 'pending' and not turn the 'MIL/check engine light' on depending on the type of fault and/or frequency and duration of it.