Ford Fiesta 1.4 Tdci 2010 Help me Please!

[grahampound]

Symptoms:

Engine management light (no codes)
Limp mode

What I have done so far

Cleaned all sensors
Serviced Fuel Injectors
Serviced EGR valve

Once the engine is up to temperature, no engine management light comes and at high revs it is lovely and smooth. However at idle it's rough.

I hope someone can offer some suggestions or it's car heaven I think.

Cheers, Graham.

 

[johnny2007]

I'll throw it there: Camshaft speed sensor.
My friend's focus had rough idle and engine management light on and after many failed attempts of repair, that's what it was.

 

[cdbe]

I presume a decent diagnostic garage (Facebook seems to be where they all show off) could help - they can look at levels and parameters when the engine is running.

 

[grahampound]

Thank you both.

I have ordered a MAF sensor as it makes no difference if it’s connected or not. Next I will try the speed sensor.

Cdbe, I am trying all the cheap stuff first but I am stubborn so will get in an ‘expert as a last resort!

 

[Burnerman]

I don't understand why there aren't any fault codes stored when the malfunction lamp has been on?
John

 

[grahampound]

This is what is so annoying John. Reading through numerous threads and articles, it appears that codes are not always thrown out, especially with fuel and air issues. Of course, it could be my cheap code reader as I have heard they have limited functionality.

 

[johnny2007]

Next I will try the speed sensor.

Sorry, I meant camshaft position sensor, not speed.

 

[carmanmemoranda]

I don't understand why there aren't any fault codes stored when the malfunction lamp has been on?
John

Not a good enough scanner

 

[carmanmemoranda]

Symptoms:

Engine management light (no codes)
Limp mode

What I have done so far

Cleaned all sensors

How

Serviced Fuel Injectors

How

Serviced EGR valve

How

Once the engine is up to temperature, no engine management light comes and at high revs it is lovely and smooth. However at idle it's rough.

I hope someone can offer some suggestions or it's car heaven I think.

Cheers, Graham.

 

[carmanmemoranda]

This is what is so annoying John. Reading through numerous threads and articles, it appears that codes are not always thrown out, especially with fuel and air issues. Of course, it could be my cheap code reader as I have heard they have limited functionality.

If it throws the engine light on, there will be at least 1 code

 

[grahampound]

Nope…. It’s a mystery.

 

[carmanmemoranda]

Nope…. It’s a mystery.

There WILL be a code. At least 1. Needs a better scanner

 

[Mottie]

I am trying all the cheap stuff first but I am stubborn so will get in an ‘expert as a last resort!

A game of parts darts can often be the dearest option! Get a decent scanner or pay someone to scan it for you.

 

[Old Salt]

My mondeo used to go into limp mode with no codes, it was the fuel lift pump.

 

[grahampound]

Thanks all.