Hello Everyone,

Anyone experienced intermittent lumpy idle/hunting on the Mondeo 2.2 TDCi ST?? (or any TDCi for that matter?!?)

Driving Dad's car for a bit while he's out of action and apparently its been doing this a while!

Will idle fine, even when cold... then all of a sudden revs will fluctuate between 1k and 500 rpm... then everything will settle again.

Happens when cold, warm, after long runs...

I have a video, that i'll try to link to shortly!

Tried fuel cleaners, injector cleaners, Supreme fuels, normal fuels... just about everything... also happened before, and since car came back from the service.

Any help you can give would be appreciated!

 

Not sure if that engine has an ICV/IACV (idle control valve), some of the older Ford petrol engines can suffer for a fluctuating idle when the valve isn't operating properly.  I'm sure some of the more knowledgeable people will be along fairly soon to advise.

 @iantt @stef123

34 minutes ago, 1979Damian said:

Not sure if that engine has an ICV/IACV (idle control valve), some of the older Ford petrol engines can suffer for a fluctuating idle when the valve isn't operating properly.  I'm sure some of the more knowledgeable people will be along fairly soon to advise.

 @iantt @stef123

its a diesel Damian lol. 

I'd want to see the results of a leak off test if it were mine. a look at live data too would help to see what's going on fuel pressure wise. 

I've only had a lumpy idle/smoke on cold which was down to worn injectors. The revs would hunt all over the place and the engine looked like it was about to leave the car any minute! 

is it the euro 3 or 4? euro 4 has electronic egr and turbo actuator.

Just now, stef123 said:

its a diesel Damian lol. 

I'd want to see the results of a leak off test if it were mine. I've only had a lumpy idle/smoke on cold which was down to worn injectors. The revs would hunt all over the place and the engine looked like it was about to leave the car any minute! 

I know, my point was if his engine has a similar valve it may be an area to look at.

10 hours ago, stef123 said:

its a diesel Damian lol. 

I'd want to see the results of a leak off test if it were mine. a look at live data too would help to see what's going on fuel pressure wise. 

I've only had a lumpy idle/smoke on cold which was down to worn injectors. The revs would hunt all over the place and the engine looked like it was about to leave the car any minute! 

is it the euro 3 or 4? euro 4 has electronic egr and turbo actuator.

Now you’re asking... I’ll have a dig around and see if it’s 3/4... 

i was worried it may be injectors (or just one) the last thing he needs right now!!

Right, I need to get my data recorder back from my mate!! 

Typically it didn’t do it at all today... I may take it to an independent garage and see what they make of it over a dealer!! 

Cheers stef

9 hours ago, TDCiST said:

Now you’re asking... I’ll have a dig around and see if it’s 3/4... 

i was worried it may be injectors (or just one) the last thing he needs right now!!

Right, I need to get my data recorder back from my mate!! 

Typically it didn’t do it at all today... I may take it to an independent garage and see what they make of it over a dealer!! 

Cheers stef

My injectors lasted 80k miles, but quite possibly less because the 'originals' had green tape on each pipe as if they had been marked up.

cost me £550 for a set to fit myself.