Vehicle & Technical > Defender

TD5 - poor low down performance

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The_Gods_Must_Be_Crazy:
Hi,

My '01 110 CSW went in for a service at my local specialist and they said part of the engine harness needs replacing as oil is getting into it and then through to the ECU (pool of oil under the seat). It's gone back in today to have this done.

At the same time they said that the engine is flat and should have lots more go.  Its the only TD5 I've driven and I've only had it a year I thought it was normal.  Once its got plenty of revs its fine and pulls as it should do.

They plugged their computer into it and it came up with loads of what they said were odd faults, which they said might be the various currents going from one terminal to another because of the oil and maybe confusing the ECU. They are not sure if replacing the harness will cure it or not.

Does this sound right? And will replacing the harness help?  It's not that I don't trust them, as I've known them a long time and fully trust them. But I'm not used to Landys with all these electronics and can't quite get my head around it, so I'd like to hear if anyone else has any exerience of this.

Thanks,

Dan.

Porny:
Hi Dan,

Welcome to the Forum  :D


What they've said about the harness is true.

Some Td5's do suffer from oil contamination via the injector harness.  Usually this can just be cured with replacement of the injector harness - which is about £45 from a dealer, and will take less than hour to change.  It is only in rare occasions that you also need to replace the whole engine harness.

If you just clean the red ECU plug out with electrical cleaner (or brake cleaner) hopefully with a new injector harness, and after 4 or 5 times of cleaning the plug you should stop getting oil to the ECU.

In all honesty they do sound a but vague in what they've told you.

The two most common causes of poor low speed performance are a faulty Air Flow Meter (very common) - and doesn't always show up as logged fault on the ECU -  and a partially blocked/open EGR (exhaust gas return valve).
Without sounding like a plug... I can supply replacement AFM's much cheaper than most other people - and I can supply a proper EGR replacement kit.  

The EGR is not needed for anything other than European Legislation which the car must meet at the time of sale... but once in private hands it can be removed - and will not affect MOT's!!

Where-abouts are you?? (your location is blank in your profile)... if you're anywhere near the Midlands (or even the Lincoln, Humberside, Doncaster area) I'd happily have a look for you.... if nothing else just to confirm what you've been told.


Cheers

Ian

The_Gods_Must_Be_Crazy:
Thanks Ian,

We tried new AFM and it made no difference. What is the EGR? The engine pulls like at train when its revving, but once you change gear it then feels a little flat before going again. It's still quicker than my old 300tdi and everyone I spoke to said they don't quite have the low down grunt of a 300 so I've always thought is was normal. Out of interest it does not really smoke.

I'm North Shropshire.

Boddle:


Item 12 Located front engine bay driverside (RHD)

a lot of people build a to blank ERG system I believe it goes in the joint to exhaust manifold (8) item (9) split the joint put a blanking plate and reconnect block the Exhausts gas being sent back though the intake manifold.

I have seen blanking plate on E-Bay £2 to £3 if you have difficulty making 1.

Had similar problem with Oil in harness, replace injector harness and cleaned ECU Plug, Engine bay harness will cost about £450, I think a can of WD40 is a lot cheaper.

The rubber seal inside the connector can expand with some cleaners it might be removing before you clean it and it with a clean rag.

Porny:
Was the AFM you swapped a new one, or a used one??
Did they check the 'live data' page to make sure it was working correctly?

What were the other errors that the diagnostic computer brought up??

A Td5 although different to drive than a 300Tdi, should be just as spritely....


EGR, as mentioned is the Exhaust Gas Recirculation...

Basically a method of recirculating some of the exhaust gas back into the intake so that it gets used again - and thus cleaning up the emissions at the exhaust pipe.
Has a habit of coating the inside of the intake with oily sludge.  :roll:
If the EGR is sticking, it will pass exhaust gas all the time which can effect performance!

I do a kit that includes a blank for the exhaust manifold (correct thickness, unlike most of the ones on Ebay) and a billet alloy section to replace part number 12.  
In doing this you can also get rid of part numbers 9, 14, 2, 1, 17, 16  :wink:

Or, if you prefer you could just blank the pipe from the exhaust manifold... but not 'as' good for a few reasons.


Have you also checked the normal stuff?? - air filter, intercooler hoses etc etc.


If every thing is working correctly... and you still want more you could always have your ECU remapped - I might know someone who can do this  :wink:   But no point if you have faults with your engine.


Ian

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