How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Mike Your Own Question

Mike, Ford Technician
Category: Ford
Satisfied Customers: 39198
Experience:  Tech Expert
Type Your Ford Question Here...
Mike is online now

focus c max 2004 1.8 duratec mis fire. recently I broke down,

Customer Question

focus c max 2004 1.8 duratec mis fire.
recently I broke down, with a mis fire. The AA attended and diagnosed a suspected valve issue on cylinder 2.
further investigation found a burnt out exhaust valve in no 2 cylinder. This has been replaced and the engine put back together. the car had a slight mis fire, which has become more noticable at between 1000 - 2000rpm. The engine management light is either lit all the time or flashes at speeds above 35/40 mph.
Can anyone offer any advice as to what could be casuing this?
Submitted: 4 years ago.
Category: Ford
Expert:  Mike replied 4 years ago.
Hello and Welcome to justanswer...

My name is MIKE - Im happy to help you with this...

Have you had any plug in / diagnostic tests done at all - ? If so, what where the results of that ?

Plus - please give me the vehilces Full reg number also -

Rgds- MIKE....................................
Customer: replied 4 years ago.


hi Mike,

Only had the inital diagnostic test which showed fault on no 2 cylinder.

Vehicle reg is DN54 PZB



Expert:  Mike replied 4 years ago.
Hi there Mark -

Apologies, your reply came after I had gone for the eve..

Ok well there are a couple of possibilities as to the cause of this Mark..

The good news is that the EML - Engine management system fault light is on / flashing - so that means the Pcm ( computer) will be logging relevant fault codes for the fault you have now - so a plug in diagnostic will be needed to retrieve those fault codes - and then go from there -

Before that, basic checks should be made as to the integrity of connections to the ignition coils - and also importantly, engine earth connections and sensors... and too - engine vacuum pipes for condition / connection. After such a rebuild its not uncommon to get a bad one of the above -any one of which can cause what you have... so those basic checks should be done first... then the code test.

Then go as directed by the code - but I'll just mention too , other possibilities... they are that you still have a problem re the valves replaced... I have known of cases where by the new valve/s have not been fitted correctly - insufficiently ground in to get a gas tight a compression test done cold and hot would find that if thats the case... or, the valve / specifically the hydraulic lifter can be sticking in use in the aperture in the head... again - compression testing is needed for that..

Other , is the possibility of faulty spark plug or ignition coil - while basic, often missed , so bear that in mind too..

Lastly you can have a Pcm unit fault - but I doubt that to be honest at least at this stage. Its very likely a follow on from the major work thats been done as above -so if you / they work through as above, you will get this sorted one way or the other - let me know how you go on.

Let me know if you need anything more on this at all -

Meantime -- Please click on the OK rating to Excellent ratings service for me now, Thank you for that... and you can get back to me anytime if you need / wish..

Best Rgds, MIKE.

Please note, you are rating the content of my "answer" - my help to you - not the "system" which can experience delays etc which are not under my personal control -or delays caused by "time -off" which we all have on occasion - Thank you.

What Customers are Saying:

  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
< Previous | Next >
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, do indeed know your stuff. Jim
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex

Meet The Experts:

  • Matt


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
< Previous | Next >
  • Matt's Avatar


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
  • Mike Kelly's Avatar

    Mike Kelly

    Ford Mechanic

    Satisfied Customers:

    17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.
  • fordspec's Avatar


    Ford Technician

    Satisfied Customers:

    ford technician
  • Gallagher99's Avatar


    Senior Vehicle Technician

    Satisfied Customers:

  • Robert's Avatar


    Ford Technician

    Satisfied Customers:

    Fully qualified 19+yrs exp/self employed technician in the UK
  • /img/opt/shirt.png Mark's Avatar


    Auto Service Technician

    Satisfied Customers:

    Qualified City & Guilds