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 Robert Your Own Question

Robert
Robert, Peugeot Technician
Category: Peugeot
Satisfied Customers: 4401
Experience:  Fully qualified 19+yrs exp/self employed technician in the UK
13210289
Type Your Peugeot Question Here...
Robert is online now

I have a 2005 Peugeot 407 SW 2.0 petrol which seems to have

Resolved Question:

I have a 2005 Peugeot 407 SW 2.0 petrol which seems to have an intermittent misfire. Not particularly evident at idle, more so when moving when I can feel small dudderings. Has been evident for weeks but put up with it. Then engine management light came on and message 'Anti-pollution faulty' came up. Have replaced plugs and coil pack but no difference though light off and no message. Will now try cleaning injectors (RedX OK?). Any other thoughts welcome as to cure.
Submitted: 1 year ago.
Category: Peugeot
Expert:  Robert replied 1 year ago.

Hi..

Did you scan the car before replacing those the plugs / coil pack?..if so what fault codes was pulled?

Coil pack new or second hand?

What condition wise was the old plugs in?

Customer: replied 1 year ago.

Sorry Robert, all this was done by my friendly mechanic. I dont have this info.

Expert:  Robert replied 1 year ago.

Hi..there thanks for your reply..

Thats fine... But normal practice is to indeed scan the car for fault codes as thats the reason the EML/Anti pollution fail coming up..the antipollution fail means the ecu is see a mixture inbalance/either lean or rich..which can be a missfire due to unburn fuel / or overfuelling fault...using the fault codes can give a better indication as what maybe wrong..considering you had the coil /plugs replaced..id be more inclined to maybe check the 02,lambda sensors/cat converter..if this missfire has been left for quite a while then this "can" damage the cat converter so bear that in mind..but as above proper testing id say would be the best way forward than spending anymore money..so emissions test/live data test to check lambda sensor/cat performance..i cant really see an injector cause this - because normally if they do go faulty if thats the case then it would still be logged in the ecu as a faulty or come up a single cyl missfire fault,where then you would investigate or swap over injectors to see if the missfire moves to another cylinder confirming a faulty injector..you mention that no warnings are up which means it could well be emission related at fault..as per possible failed lambda sensor/cat converter..I do hope this helps

Customer: replied 1 year ago.

Thanks Robert - Apparently the error code diagnosed that the coil pack was faulty and was replaced with new.

So if I understand correctly you are saying that the faulty coil pack may have caused the initial misfire and that a rich/lean mixture could have damaged the lambda sensor and/or cat? How could this then result in the same misfire symptoms when the coils and plugs have now been replaced with new?

Steve

Expert:  Robert replied 1 year ago.

Hi..there..

If the coil was faulty and not providing sufficent spark..this in turn can foul the plugs and cause partial combustion in other words can send unburnt fuel down the exhaust and thus damage the cat converter in the process if left over long period of time..and emission test id say would certainly confirm if the those exhaust sensors are performing aswell as the cat converter itself...if the midssfire is still there..then the fault must be else where and not the coil itself..there so many possibles for missfiring without doing proper diagnoses with the car plugged in/live data and such needs to be montiored..either the faults emissions as i suggested before..map sensors gone or the fault on the ecu itself..which isnt to uncommon for the coil to spike the ecu..but not as common 407 as on the 206 ranges....

Customer: replied 1 year ago.

Robert

Can you recommend anywhere in the Gloucester/Stroud/Cirencester/Bristol areas that would be able to carry out these tests?

Steve

Expert:  Robert replied 1 year ago.

Hi...

Best to find someone who has peugeot planet diagnostic software....the best site i can give to search unless you know of a good local indepandant specialist who deals with peugeot/citroen ..is www.goodgaragescheme.co.uk

Robert, Peugeot Technician
Category: Peugeot
Satisfied Customers: 4401
Experience: Fully qualified 19+yrs exp/self employed technician in the UK
Robert and other Peugeot Specialists are ready to help 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!
    Sue
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you 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:

 
 
 
  • Robert

    Robert

    Peugeot Technician

    Satisfied Customers:

    223
    Fully qualified 19+yrs exp/self employed technician in the UK
< Previous | Next >
  • http://ww2.justanswer.com/uploads/FO/fordtwo/2014-12-19_163422_arrepair.64x64.jpg Robert's Avatar

    Robert

    Peugeot Technician

    Satisfied Customers:

    223
    Fully qualified 19+yrs exp/self employed technician in the UK
  • /img/opt/shirt.png Mark's Avatar

    Mark

    Peugeot Certified Technician

    Satisfied Customers:

    73
    Fully qualified technician and MOT tester.
  • http://ww2.justanswer.com/uploads/IN/indytech/2013-8-8_102717_SantoDomingo146598x6402.64x64.jpg Greg's Avatar

    Greg

    Technician

    Satisfied Customers:

    1081
    Automotive diagnostic tech
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Mechanical Engineer

    Satisfied Customers:

    4474
    BEng hons Mech engineering, in auto industry 22 years
  • http://ww2.justanswer.com/uploads/TE/techmachine/0601821347169_717372168_8940977_39623330_o.64x64.jpg Ross's Avatar

    Ross

    Diagnostic and repair technician

    Satisfied Customers:

    453
    Licensed diagnostic and repair technician
  • http://ww2.justanswer.com/uploads/RO/RobMechanic/068.64x64.JPG Rob's Avatar

    Rob

    ASE Certified Technician

    Satisfied Customers:

    82
    30 years trade experience