Location : High Wycombe Join date : 2012-06-18 Posts : 10
Subject: Flat spots in my jcw 30th December 2012, 19:00
Ive recently got this problem with my 2004 jcw. Every time I go to accelerate between 1500 and 3000 rpm I get flat spots and then it clears until I get above 3000. Could spark plugs have this effect? If any can shed any light I would be very grateful Thanks
AM_AUTOS
Location : United Kingdom Member Number - SnM : 786 Join date : 2012-04-17 Posts : 2169
Subject: Re: Flat spots in my jcw 30th December 2012, 19:07
Check your spark plugs, oil and filter
Is your exhaust standard?
bruce62 Club Endorser 4
Location : sunbury Member Number - SnM : 62 Join date : 2010-01-31 Posts : 1607
Subject: Re: Flat spots in my jcw 30th December 2012, 19:33
A common fault with this happening is the bypass valve ( weak spring on valve flap ) . It's a job you can do yourself and when I changed my bypass valve a year ago when i had this problem I think the part was approx £60 .
Might be worth changing the plugs first as a cheaper fix if its just a plug breaking down .
NeilAndHisMini
Location : Angmering, West Sussex Member Number - SnM : 071 Join date : 2010-02-08 Posts : 12770
Subject: Re: Flat spots in my jcw 30th December 2012, 21:32
Have been getting the same problem on my 2006 JCW recently.
Had the bypass valve replaced but that didn't fix it, think it will be spark plugs next.
