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[cdbdiis]

Hello everyone, I'm new here by the way !
Anyway I have an M reg 2.5td auto estate and the fuel consumption is terrible, at best 25 mpg at worst I dare not calculate it ! There is a lot of black smoke from the exhaust, could the two things be connected ?
My suspicion is the pump timing, can anyone tell me how this is adjusted or are there any other opinions ? The car is relatively new to me and has covered just on 160,000 miles it will be used to tow a car transporter trailer.
Thanks

[TheBoy]

Hello everyone, I'm new here by the way !
Anyway I have an M reg 2.5td auto estate and the fuel consumption is terrible, at best 25 mpg at worst I dare not calculate it ! There is a lot of black smoke from the exhaust, could the two things be connected ?
My suspicion is the pump timing, can anyone tell me how this is adjusted or are there any other opinions ? The car is relatively new to me and has covered just on 160,000 miles it will be used to tow a car transporter trailer.
Thanks

Could well be the chain has slipped - happens with people do not change oil as per schedule (every 4.5k MAX) on these engines  

Could also be a simple sensor issue, but you'll need to get it hooked up to a Tech1 to read it...

[cdbdiis]

thanks, "but you'll need to get it hooked up to a Tech1 to read it..."  
I've read quite a lot about this, how do you go about it and what is it likely to cost ?

[M Kerr]

Black smoke from diesels can be caused by timing or worn injectors.  Timing can be fairly easily adjusted but best left to someone with reasonable knowledge.  Given the mileage it is possible that recon'd injectors might be required.  Possible both.  It shouldn't cost too much to get the timing checked and adjusted if required so try this first.  I won't put a price on injectors but you'll dip into your pocket if they need changing.  The job is easy but the parts cost a bit!

Cheers,

Martin

[TheBoy]

thanks, "but you'll need to get it hooked up to a Tech1 to read it..."  
I've read quite a lot about this, how do you go about it and what is it likely to cost ?

Need to find someone with a Tech1 near you.  A Tech2 will not read that engine.

[waspy]

My first thing to look at before we get technical is- check for obstructions in/around the air filter box. The Rover Diesel of old where known to suck up plastic bags & debri. It happened to me with a misplaced rag that my mate used to check the oil.
Black smoke galore

You never know  

[cdbdiis]

thanks, "but you'll need to get it hooked up to a Tech1 to read it..."  
I've read quite a lot about this, how do you go about it and what is it likely to cost ?

Need to find someone with a Tech1 near you.  A Tech2 will not read that engine.

I spend a lot of time at Silverstone.... not far from Northampton, can you see where this is going  

[TheBoy]

thanks, "but you'll need to get it hooked up to a Tech1 to read it..."  
I've read quite a lot about this, how do you go about it and what is it likely to cost ?

Need to find someone with a Tech1 near you.  A Tech2 will not read that engine.

I spend a lot of time at Silverstone.... not far from Northampton, can you see where this is going  

I actually live near Silverstone, a small town called Brackley.

Unfortunately, I do not own a Tech1

[cdbdiis]

thanks, "but you'll need to get it hooked up to a Tech1 to read it..."  
I've read quite a lot about this, how do you go about it and what is it likely to cost ?

Need to find someone with a Tech1 near you.  A Tech2 will not read that engine.

I spend a lot of time at Silverstone.... not far from Northampton, can you see where this is going  

I actually live near Silverstone, a small town called Brackley.

Unfortunately, I do not own a Tech1

No probs ! Can I reasonably expect to get 35mpg out of it when it's sorted, mixed driving A-B roads ?

[TheBoy]

thanks, "but you'll need to get it hooked up to a Tech1 to read it..."  
I've read quite a lot about this, how do you go about it and what is it likely to cost ?

Need to find someone with a Tech1 near you.  A Tech2 will not read that engine.

I spend a lot of time at Silverstone.... not far from Northampton, can you see where this is going  

I actually live near Silverstone, a small town called Brackley.

Unfortunately, I do not own a Tech1

No probs ! Can I reasonably expect to get 35mpg out of it when it's sorted, mixed driving A-B roads ?

i get 37 from my tractor, though is chipped

[cdbdiis]

So how is the pump timing adjusted ?

[TheBoy]

So how is the pump timing adjusted ?

3 bolts hold in place, when loosened, you can rotate it slightly.  A gauge is put in back of pump to get it timed right.

If it has jumped a tooth (or the plastic guides broken), there won't be enough adjustment, plus it will happen again. The solution to that is changing the chains and guides - thats a head and sump off job sadly (silly BMW design!)

If the pump timing has moved/slipped, I think that is a job best left to a specialist with the right equipment


Hopefully it will not be that, and it is a simple sensor issue (I am assuming you have checked obvious like filters etc

[cdbdiis]

Right so with the Tech 1 it should be possible to check sensors etc. ?
Will this also reveal an out of time pump ?
Great informative forum you have here by the way  

[TheBoy]

Right so with the Tech 1 it should be possible to check sensors etc. ?
Will this also reveal an out of time pump ?
Great informative forum you have here by the way  

Tech1 will show if ECU not happy with sensors.

Its not the easiest bit of kit to use for live data views for in depth analysis though.

[cdbdiis]

An update on this then.
After removing the air filter and driving the car with the top of the filter casing lifted off, not recommended I know but it's do or die, there was a marked improvement both in smoke output and performance. After some initial smoking it cleared completely.
I could find no blockage in the inlet piework going to the air filter housing but the flexible pipe was detached completely (2" gap) from the plastic inlet tube behind the grille. Could this be the problem ?
Before I found the pipework problem I fitted a new air filter and it went back to how it was.