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Mk 2 focus 2.0 tdci hesitating


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 I have a 2007 2.0 tdci with egr blanking plate fitted for over 6 months and over the last couple of weeks it's started to judder and hesitate at about 1800rpm, yesterday It was the worst it's been ! 

 

Was thinking of changing the fuel filter to see if that makes a difference 

Any help would be appreciated

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I would go with the cheaper option first but it can be many things like injectors, fly wheel, boosts leaks or even the turbo. Best to get a code reader if the filter change doesn't help. 

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Yeah have scanned it with an odb reader using two apps which both say different one says egr valve getting to hot , this could be because of the blanking plate and the other said maf sensor .

Going to try another app today which had good reviews.

Did wonder about the injectors but wouldn't that cause problems when you boot it ?

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Hmm have you tried giving the maf a Clean? Bad injectors you would get surging and bucking under various throttle loads. 

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Didn't know you could clean the maf tbh .

Did another scan earlier and just comes up with the egr fault probably because of the blanking plate 

Was going to do another scan while driving it later just to see if it picks anything up when it's under load 

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I'd remove the EGR blank personally.  

The MAF readings will seem wrong if the PCM thinks the EGR is open but there's still the same amount of airflow through the MAF. 

I've never seen an overheating EGR code though, sure it wasn't DPF too hot?

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4 hours ago, Joey1974 said:

Didn't know you could clean the maf tbh .

Did another scan earlier and just comes up with the egr fault probably because of the blanking plate 

Was going to do another scan while driving it later just to see if it picks anything up when it's under load 

I meant the sensor 😂 

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On the way home EML went out and still run lumpy when holding it at 1800 rpm , went back out earlier and the EML light came back on .

Will remove the blanking plate tomorrow and see what happens then .

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12 hours ago, Joey1974 said:

On the way home EML went out and still run lumpy when holding it at 1800 rpm , went back out earlier and the EML light came back on .

Will remove the blanking plate tomorrow and see what happens then .

Circuit high is likely to mean the electrical side of the EGR has failed.  If so, it won't make any difference whether you have a blank or not, and cleaning won't help either.  It would either need a replacement part or mapping out of the PCM.

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1 hour ago, Joey1974 said:

Ok Tom thanks for the info would plugging it into a machine pinpoint where the fault is ?

In this particular case, Forscan will probably just give you a similar code or something like 'EGR Frozen'.  It's always worth checking though.

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