TD4 running badly below 2000 rpm fixed

Hi everyone, I posted a while ago about the freelander running rough below 2000 rpm, dis the maf and it runs fine, remember it?
Well, there's a few had the issue and nobody seems to have found the solution, well I have and it's nothing to do with the maf, its the egr solenoid!
I reconnected the maf and attached a vac gauge to the egr vac line, start the engine and no vac, just touching the pedal slightly and I got full vac, 10"hg, this remained right across the rev range, clearly having the egr open full bore at low revs is effectively choking the engine. I blanked the vac line at the egr and took it for a run, perfect, it runs like a good un, and obviously having the maf reconnected means I'm not running on default values so therefore should get better fuel economy.
I hear so many people saying to do away with the egr as it just fills the engine with gunk, so I think it doesn't matter, I'm not wasting money replacing the solenoid, only to blank the egr anyway, so to those running around with the maf disconnected because otherwise the car runs like crap below 2000rpm, know you know the answer, plug the maf back in and disable the egr valve.

I'm pretty sure that most people will have either removed the MAF completely, or plugged the VAC pipe to it. It's interesting that the solenoid valve is held open all the time though, as that's not how it's supposed to work.

Good spot.

For MAF read EGR. Nodge brain fade!!

Nodge68 said:

I'm pretty sure that most people will have either removed the MAF completely, or plugged the VAC pipe to it. It's interesting that the solenoid valve is held open all the time though, as that's not how it's supposed to work.

Good spot.

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Yes, people do disable the egr for other reasons, but I've never heard of anybody actually finding a solution to the problem I was having, I suppose unfortunately you do get a lot of people who'll come on forums asking for help, but when they do get a solution they never come back. which is why I did. I wonder how many people are running around with the maf disconnected because they don't realise it's actually to do with the egr, hopefully I'll get decent fuel figures now, because running on default values I was only getting around 25 mpg, which is terrible for a diesel.

philthespark said:

...you do get a lot of people who'll come on forums asking for help, but when they do get a solution they never come back. which is why I did...

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Thanks for doing so too! I picked up a Td4 last week that feels dead until the turbo kicks in and goes well thereafter, sounds like something I should check when I do an oil & filters change once the rain stops...

philthespark said:

I've never heard of anybody actually finding a solution to the problem I was having

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It's definitely a strange issue, but could also be very common.

philthespark said:

unfortunately you do get a lot of people who'll come on forums asking for help, but when they do get a solution they never come back.

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That's so true .So thanks for the update.