Td5 bcu and rough idle

Just changed the bcu on my d2 because central locking wasn’t working
Now it starts but has a rough idle admittedly I only ran it for a minute or 2 because I was in a rush the item codes on the bcus didn’t match is that most Likely the problem. Only other thing is one has egr delete and one doesn’t
And one was auto one manual but I changed the settings

The BCU has nothing to do with how the engine is running whatsoever, it can stop it from starting for good but can't affect it's behaviour once it's running.... and BTW no such thing as "egr delete" in the BCU settings

sierrafery said:

The BCU has nothing to do with how the engine is running whatsoever, it can stop it from starting for good but can't affect it's behaviour once it's running.... and BTW no such thing as "egr delete" in the BCU settings

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Hmm must just been a coincidence then it has been down on power and drinking fuel before hand seems to bog down between 2-3k revs boost readings are all good thought and I’ve changed the maf(which was faulty)and injector Loom. still behaves the same

Injector seals, oil in ECU plug, dirty map sensor, chafed loom, leaking injector, faulty boost solonoid to suggest a few....
There is a 101 different issues the td5 engine will eventually falter to

craigoodwood said:

Injector seals, oil in ECU plug, dirty map sensor, chafed loom, leaking injector, faulty boost solonoid to suggest a few....
There is a 101 different issues the td5 engine will eventually falter to

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I'd add MAP/IAT to that. It made the most difference to mine.
So just a personal point of view.