fazersteve Posted May 4, 2013 Share Posted May 4, 2013 Help! I just had a restless nights sleep as think I may have made the worst buying decision in in 35 yrs driving,i brought a 2003 1.8 zetec petrol focus with a known misfire for £600,after buying a new coil pack,leads & sparks plugs I still had the misfire,a local garage confirmed No. 1 cyl was low on compression & found the burnt out valve found when it was stripped down,after replacing the valve it still had low compression & the misfire,its now had all the rings replaced so compession is like new etc,to cut a long story short they just about to give up on it as they just spent a day on it,swapping injectors,leads,coilpack,plugs etc,at the moment they got the manifold off looking for cracks etc but even after getting the bosses friend in to help they at a loss to find the problem its always No. 1 cyl that's give the misfire,i dont think I have any choice now but have it to put it back together & drive it,,i sure someone has had this problem before but I not sure its worth spending any more on it,it I do get to the bottom of it I will let you all know in the hope it will save someone else the expense ive had,cheers Steve Quote Link to comment Share on other sites More sharing options...
Stoney871 Posted May 4, 2013 Share Posted May 4, 2013 Have a read and see if anything leaps out at you- http://www.engine-misfire.com/ Quote Link to comment Share on other sites More sharing options...
wase16ll Posted May 4, 2013 Share Posted May 4, 2013 are we talking a permanent misfire or random, does it miss at idle only, or throughout the rev range if permanent.. well if you take the 4 stroke process one by one fuel....injectors have been swapped, but is no 1 receiving a signal to open compression...now up to level so can be eliminated..so long as compression is strong and reaches its reading within 3-4 strokes max, and valves are actually opening, could be a problem with cam for eg... ignition..new leads etc, but is coil pack sending a spark to no 1 at correct time, sometimes the ecu can fail...get a set of plug testers that fit between lead and plug, i know plugs are recessed but should still be visable exhaust...only reason i can think for a problem here, if compression is good, would be a blockage in manifold at no 1 or valve isnt opening Quote Link to comment Share on other sites More sharing options...
artscot79 Posted May 4, 2013 Share Posted May 4, 2013 the pcm diodes fail causing a misfire that cant be cured the pcm would have to be removed and sent away for testing and repair bba reman do them but its around £250 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.