Rough idle

tom1979 · Jun 26, 2018

2003/53 Disco TD5 Auto. Pretty much replaced everything since I bought it in October but I still get a strange rough idle at a standstill and more noticeable when coming off the power up to a junction.

When I did the injector seals I put a Bearmach injector loom in, so before I fork out £70 for a genuine one could this cause this?

Cheers

sierrafery · Jun 26, 2018

Can't you record a live data log?...as long as np oil t the plugs, the injector roughness is OK and no injector related codes logged i doubt it's the loom

tom1979 · Jun 26, 2018

I’m never sure how to measure the cylinder balance. At idle they vary considerably, but all my TD5’s are the same.

sierrafery · Jun 26, 2018

They are relevant only at idle and ideal is to not exceed +/- 4 while they compensate for each other but untill +/-8 is acceptable... if this is exceeded can be fuel pressure or other issue

tom1979 · Jun 26, 2018

Really I think all three of my td5’s vary by +/- 20 or more! This is the only one with a rough idle.

I will check again

sierrafery · Jun 26, 2018

tom1979 said:
ll three of my td5’s vary by +/- 20 or more

That means they dont run 100% well even if it seems so

tom1979 · Jun 26, 2018

I have some reconditioned black top injectors I had done at merlin but I’m saving them for the rebuilt engine.

sierrafery · Jun 26, 2018

Bad balance is not necessarily caused by injectors...it's a very complex algorythm and the whole addaptive strategy and fuel supply is involved...if you want to really understand study this http://www.sciencedirect.com/scienc...fd37ac2&pid=1-s2.0-S1474667017561534-main.pdf

johnlad · Jun 26, 2018

When my injector balance was way out it wasresolved with the fitting of a new maf sensor, even though the reading from original maf was within tolerance

tom1979 · Jun 26, 2018

johnlad said:
When my injector balance was way out it wasresolved with the fitting of a new maf sensor, even though the reading from original maf was within tolerance

Could be worth a try I have some spare MAFs,VDO too

Discodevon · Jun 29, 2018

Try a decent 10w40 in it mate

Rough idle

tom1979

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sierrafery

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tom1979

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sierrafery

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tom1979

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sierrafery

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tom1979

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tom1979

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