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_a_mechanic Your Own Question
mike_a_mechanic, ASE Certified Technician
Category: Peugeot
Satisfied Customers: 5471
Experience:  17 years experience as a auto mechanic, foreign and domestic.5 years running my own repair business.
Type Your Peugeot Question Here...
mike_a_mechanic is online now

Hi I have a 2008 peugeot 308 sport 1.6vti (120) which has

This answer was rated:

I have a 2008 peugeot 308 sport 1.6vti (120) which has developed an Idling problem on initial start up, which developes when slight revs are applied. When you remove the revs the idle speed drops and fluctuates with a popping (misfire??) sound from the engine bay and a strong smell of petrol. If you then turn off the engine and re-start everything is ok. On occasion when this has happened a depolution system fault is displayed on the central display and the engine warning light comes on. If you run the car down the motorway, this fsult disappears.
I have had the diagnostics unit on which displayed a misfire on 3&4. I have replaced the coils on 3&4 with no joy, I then replaced all 4 plugs (platinum type) still with no joy.
Please advise.
I look forward to your reply
Hello, welcome. My name isXXXXX will do my very best to assist you with your question. I apologize if you have been waiting long for a response.

From what you are describing the issue that you are having is consistent with electrically failing fuel injectors which normally don't show up on normal diagnostic. The vehicle needs to have a balance test performed on the cylinders which specifically test the fuel injectors and determines the bad ones.
mike_a_mechanic and other Peugeot Specialists are ready to help you