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Author Topic: 2.5 TD EGR Valve Questions  (Read 1077 times)

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Scatmancraig

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2.5 TD EGR Valve Questions
« on: 27 July 2016, 14:39:24 »

The EGR valve on my 2.5 TD has been disconnected.  It was like this when I bought it.  Why would someone do this?  I've no idea what disconnecting it actually does, but I'd be interested to learn.

On the same subject, I saw a 2.5 TD Estate in a field at Billing the other week, the EGR valve on that had been removed and replaced with a shiny piece of straight pipe.  So obviously there's a reason for doing this, why?
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RossPhim

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Re: 2.5 TD EGR Valve Questions
« Reply #1 on: 27 July 2016, 15:00:36 »

Better cold running and starting probably.
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TheBoy

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Re: 2.5 TD EGR Valve Questions
« Reply #2 on: 27 July 2016, 19:07:01 »

Dreadfully unreliable. Typical BMW stupidity I'm afraid.
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Scatmancraig

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Re: 2.5 TD EGR Valve Questions
« Reply #3 on: 29 July 2016, 06:10:07 »

I thought that might be the case. Does not having it connected affect the performance at all?
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aaronjb

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Re: 2.5 TD EGR Valve Questions
« Reply #4 on: 29 July 2016, 10:11:00 »

Emissions go up (but not tested ones) and economy will suffer slightly when it's removed or blanked (based on my experience with my old tractor).. not that economy was particularly brilliant to begin with ;D
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Scatmancraig

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Re: 2.5 TD EGR Valve Questions
« Reply #5 on: 31 July 2016, 17:38:16 »

Emissions go up (but not tested ones) and economy will suffer slightly when it's removed or blanked (based on my experience with my old tractor).. not that economy was particularly brilliant to begin with ;D
You're not wrong on the economy front.  I reckon it's about equal with the 3.0 petrol Carltons and Senators round town (my TD is auto).  I'm struggling to get above 25mpg on my commute to work (4.5 miles each way). It does seem to improve massively on a longer run though, as once the torque converter is locked, you're effectively in a solid drive with higher gearing (I think) than a manual.  It doesn't help that GM seemed to have fitted the TD with a more slippy torque converter, which I'm told was done deliberately to allow the turbo to boost more quickly.  Great idea, not, as it ruins the fuel consumption and makes having the diesel engine almost pointless!!
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