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644 posts

Ultimate Geek
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Topic # 223056 10-Sep-2017 16:54
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A family member has an issue with their Ford Fiesta 2008 manual. It has a 1.6L Duratec (Sigma) engine. The car has an intermittent problem starting. It will show the signs of starting, then fade out and stall. Today I tried starting it and it started first time. Then after getting said relative in the car to discuss things to look out for (e.g. listen for the fuel pump) it then began exhibiting the problem. It felt like if I could give it a bit of throttle it should still be able to be started, but there was a complete disconnect between the pedal and the motor losing revs and stalling. I can only assume it's got a fly by wire throttle and ignores the pedal when starting. In discussion about the issue, it seems that it's not related to cold/warm starting, it can happen any time.


The car has also started knocking when lugging the engine in 3rd about the same time which I think cannot be a coincidence.


Does anyone have experience with this car/engine who could give some pointers?


It seems to have fuel pressure and spark, so I can only assume it's some sort of metering issue? I wouldn't know where to start to pull any codes, as I'm a 1990's Nissan person. Cam belt was replaced, but the issue existed before this. As a result I think the timing is OK as I trust the mechanic who did the timing belt to put everything at factory spec.











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  Reply # 1861899 10-Sep-2017 17:26
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First step is probably throw an OBD scan tool on it - if you haven't got one, a cheap USB/bluetooth with FORScan is a good start.



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Ultimate Geek
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  Reply # 1861900 10-Sep-2017 17:33
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Bit harder without a code reader but Google tells me: 


Fiesta 08-17 DTC Codes


To access the test mode, hold the trip meter reset button in and turn the key to the on position, then the gauges will do a full sweep and state gauge on the LCD.. You are then able to press the button to get the details.


First digit structure is as follows:


Pxxxx for power train
Bxxxx for body
Cxxxx for chassis
Uxxxx for future systems


Second digit structure is:


P0xxx Government required codes
P1xxx Manufacturer codes for additional emission system function; not required but reported to the government


Third digit structure is:


Px1xx measurement of air and fuel
Px2xx measurement of air and fuel
Px3xx ignition system
Px4xx additional emission control
Px5xx speed and idle regulation
Px6xx computer and output signals
Px7xx transmission
Px8xx transmission
Px9xx control modules, input and output signals


The fourth and fifth digits designate the individual components and systems.


Does doing that show you any codes?

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Ultimate Geek
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  Reply # 1861901 10-Sep-2017 17:33
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First step is probably throw an OBD scan tool on it - if you haven't got one, a cheap USB/bluetooth with FORScan is a good start.





Do I just need an ELM327 adapter? Do you know where the port is? I couldn't find it. Whatever the issue is it's not enough to trigger the CEL.



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  Reply # 1861903 10-Sep-2017 17:36
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You need to get fault codes read by someone using the right diagnostic gear, personally although Ford franchises have the right gear, I have little faith in them and would try to find a specialist mechanic.


The symptoms sound to me like an intermittent fault or dirty MAP sensor (presumed - could be a T-MAP sensor or MAF sensor).


You could try googling cleaning the T-MAP/MAP/MAF sensor or whatever it is in that model - but you don't want to go swapping parts unless that's confirmed. 

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  Reply # 1861905 10-Sep-2017 17:38
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Yep, an ELM327. If it's the same as the later Fiesta, it's behind the small storage bin by the driver's right knee.

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  Reply # 1861938 10-Sep-2017 19:05
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Oxogen sensor? 




Common fault in a ford (driven a few). 





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  Reply # 1861947 10-Sep-2017 19:46
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Oxogen sensor? 




Common fault in a ford (driven a few). 









Yep.  Airflow sensor would be my vote as well (former owner of Fords...never again).  Without the codes (if there is one) hard to tell.  This might be one of those cases that it isn't worth the time and trouble and just take it to the dealer.  

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  Reply # 1861983 10-Sep-2017 21:18
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Had a Ford Fiesta 2004. Gave it to FIL. It would throw a CEL every so often and lose power.


Every time taken to dealer - clears the code and says nothing wrong.


(When insisted on telling what the code shows apparently acc to FIL who is not very good at communicating, showed he was "speeding" ... I told him it's a sensor fault but he doesn't do anything about it and just drives it in town.)

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