Morning all,

I get an intermittent judder which you can here whilst slowly reving the engine and occasionally can be felt whilst crawling.

Ive plugged the IID tool in and it's basically showing that injector number 1 is overfueling.

I'm thinking ive either got an injector or wiring loom fault.

Could a wiring loom fault cause it to overfuel though? I was thinking not as if it was a wiring fault surely the injector would do nothing rather than overfuel?

I know the answer would be to swap 2 injectors round and see if the fault moves but I don't want to do that for 2 reasons... 1/ I can get to injector number 1 without removing the inlet manifold, 2/ I'm led to believe the injectors are a pain to get out.

Any advise would be appreciated.


Many thanks.

If you don't want to fiddle with swapping stuff around, just throw a new injector in and see if it cures it. They're about £60 for a Recon one, so not the worst thing if your RR ends up with a new injector it didn't really need.

^ I would say that your price is a bit light... by £100 ish, I paid £135 per injector for refurb by a Bosch Agent with warranty.... £60 is more like the second hand pot luck price!

And it does sound like the injector is in need of looking at, the fact that it's showing up on the IID tool would rule out a loom fault! Yesterday I couldn't spell Engineer... Today I are one!
Inventor of the 'Guide-o-Matic automatic wheel alignment tool'
Former long term L322 owner, Up/Down graded to a Classic Tractor!

Thanks guys,

Tbh, I'm not sure how the injection system works 100%

Is it just a positive and negative which comes out of the fuel injection ecu to each injector that open closes the solenoid or does it work off a resistance??

There a diesel specialist not far from me so I may ask them to test and if necessary rebuild the injector at least that way I'd know if it's actually faulty.

The injector is just a coil.. bit like a relay for liquid! But the spray nozzle can get blocked.. the electrical side works fine but nothing gets to the engine...

If your engine is 80K + then getting the injectors cleaned and tested is well worth it... I had what I thought was 1 injector fail, but it turned out to be 2... ran like a sick pig on anything other that flat out, then it was a little sluggish but a lot happier! Yesterday I couldn't spell Engineer... Today I are one!
Inventor of the 'Guide-o-Matic automatic wheel alignment tool'
Former long term L322 owner, Up/Down graded to a Classic Tractor!

I got one of mine exchanged for a recon one whilst over in the UK, 80pounds courier drops off the new and takes yours, all included. Note these have NEW nozzles so it's an unbeatable price via ebay. https://www.ebay.co.uk/itm/BMW-330d-530d-7...Swr~dZjc~9 2007 TDV8 VSE
2003 TD6 gone.
2002 P38a gone
1999 P38a gone
1997 p38a gone
1993 VSE gone
1992 VSE gone
1966 Series 2a with V8 conversion gone

Spoke to the diesel specialist, quite a helpful chap tbh, he said the injectors wear out internally which causes them to overfuel and as mines reading +6 it's well goosed.

He advised service exchange would be my best bet and quoted me £125.00.

I'll have a look at the link above first though as that sounds like a good deal.

It looks like an exceptionally good deal! Plus they supply a new washer!

Easy to fit if you are fairly good with a spanner... nothing too rocket scientist about the job... there are a couple of tricks that can help, if you're interested! Yesterday I couldn't spell Engineer... Today I are one!
Inventor of the 'Guide-o-Matic automatic wheel alignment tool'
Former long term L322 owner, Up/Down graded to a Classic Tractor!

What I did was pick up the cheapest used one I could find, make an offer on ebay, I found one for 20 pounds then did the swap with that. Still only 100 and you have still got the old one if you need a swap in the future. Takes any pressure off doing the swap. I was very impressed with the recon unit, New nozzle, pin and washer plus had plastic protectors on the inlet and nozzle, it would almost pass as new. Highly recommended. 2007 TDV8 VSE
2003 TD6 gone.
2002 P38a gone
1999 P38a gone
1997 p38a gone
1993 VSE gone
1992 VSE gone
1966 Series 2a with V8 conversion gone

Yep, think I'm going to go with the offer above as there's no surcharge doing it that way.

Just need to make sure I can get the faulty one out first as there's no cheap 2nd hand one's for sale, I did think of that.

Any tips for getting it out then? It's number 1 so at least I don't need to take the inlet manifold off!

Step 1 car in low mode!!
Step 2 bonnet in service position (90 degrees)
Step 3 remove fresh air box.. undo the 2 13mm/M8 nuts and lift the box up and forward!

As above but I would use Plusgas not WD40. http://www.ebay.co.uk/itm/PLUS-GAS-Releasi...0704.m4779 2007 TDV8 VSE
2003 TD6 gone.
2002 P38a gone
1999 P38a gone
1997 p38a gone
1993 VSE gone
1992 VSE gone
1966 Series 2a with V8 conversion gone

Thanks for your help guys, never thought of loosening the injector bolt and letting it pressurise itself out but that sounds like a good trick!

As I said do it on a hot engine and only a couple of turns on the nuts.... I can't remember if you can get to the injector with it all connected, you might have to loosen off and then crank the engine... DON'T disconnect the fuel pipe as it will flood the place with the engine on!

To be honest it's been a couple of years since I've been in the top of a ffrr engine, I have gained more recent experience with the Merc, which is a bloody stupid one bolt design and fails on a regular basis, so regularly it is know as 'The Black Death'
But like the BMW engine the injectors can weld themselves in, and the hot engine and loosen the bolt with it running are tricks that I've picked up for the Merc, but I can't see why it wouldn't work with the BMW lump  Yesterday I couldn't spell Engineer... Today I are one!
Inventor of the 'Guide-o-Matic automatic wheel alignment tool'
Former long term L322 owner, Up/Down graded to a Classic Tractor!

i had a reading of 6 on injector 3 and also fault code for same cyclinder.
Mine was the loom, as when i touched the wiring going to injector 3 the engine would cough.
i connected up live data and could watch the fuel compensation going down to zero as i gently touched the loom.