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My name is ***** *****. I recently bought a 1.6 Diesel Focus…

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Hi, my name is...

Hi, my name is ***** *****. I recently bought a 1.6 Diesel Focus automatic with 80,000 miles, which quickly deteriorated. Replaced Fuel pump, boost sensor, EGR valve, and mass air flow sensor. A new problem has arisen - at low speed, low RPM and low throttle setting the engine "hunts" regularly about 100 rpm, sometimes causing a dip in power on pressing the throttle from standstill, and slow acceleration to about 10 mph. Once above about 2000 rpm under load the car performs really well. fuel economy is excellent but there is sometimes a puff of black smoke at low speed. Cold starting is also a problem, but I think that is just heater plugs. Rgards ***** *****

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Focus C-Max Ghia Reg YB 04 CNX. Nothing more to add

Submitted: 2 years ago.Category: UK Car
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Answered in 10 hours by:
3/1/2016
UK Auto Mechanic: Peter Zavarelli,
 replied 2 years ago
Peter Zavarelli
Category: UK Car
Satisfied Customers: 33,929
Experience: Technical Consultant at Just Answer
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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.My info is somewhat limited on your model here but I had seen no one else has responded and would like to see if I can help here.If at any time you feel that I cannot help with this please let me know.

If you have not had the fuel injectors tested at all this should be done.If one or more fuel injectors are found to be at fault this can cause this type of fault here and the affected fuel injector usually needs replaced.This will cause rpm surge,hesitation and black smoke.

I would have the glow plugs tested as well to see if one or more are at fault needing replaced as this can cause the hard cold starting issue here.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

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