DonDownUnder's D3 dropping into Limp Mode

**Narangga** · 4th January 2017, 07:51 AM

Originally Posted by DiscoJono

Definitely worth investigating. I've found I can trigger limp mode if I plant the foot from a complete stop. So the fault is evident in the low gears as well. I'll blow the fuel lines out when I service the car this week but it really does sound like it's a communications issue, as you say. That's what has me thinking about the accelerator pedal. I've seen electronic ones go bad before and give incorrect resistance / reading to the ECU.

For the two or three minutes it takes - Have you cleaned the MAP sensor?

**DonDownunder** · 4th January 2017, 09:45 AM

Hello. Fuel lift pump replaced and associated filter and pipework flushed. Main injection pump and belt replaced. All fuel sensors replaced and associated wiring checked. Problem associated with fuel demand. Suggest having fuel tank cleaned out. Could have Algea growth which affecting lift pump suction at high flow demand. We did get a bad batch of fuel once which gave the same problem but eventually went away. Another idea was to have fuel injection mapping checked and calibrated at full load on a dyno and full diagnostics etc. Also the issue could be that the low fuel pressure is the system dumping fuel to protect something else which is off scale and outside of set parameters and limits specs. Brad at KLR at South Windsor did a lot of work on D3 as well as Dany at Alto Landrover Nth Sydney and Chris at Toowoomba Landrover . Good luck

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**Graeme** · 4th January 2017, 09:47 AM

Originally Posted by DiscoJono

I've found I can trigger limp mode if I plant the foot from a complete stop. So the fault is evident in the low gears as well.

Pretty much confirms that it's not caused by blockages or faulty pumps.

**DiscoJono** · 4th January 2017, 12:17 PM

Cheers Don. Great to know. I just pulled the MAP sensor and it was absolutely filthy. Gave it a good hit with Contact Cleaner and reinstalled. Limp mode has disappeared. I can plant my foot to the floor without the dreaded "ding ding". Hopefully it stays away. Very happy with the car though. Built nice and tough and well looked after. Cheers!

**Narangga** · 4th January 2017, 12:27 PM

Originally Posted by DiscoJono

Cheers Don. Great to know. I just pulled the MAP sensor and it was absolutely filthy. Gave it a good hit with Contact Cleaner and reinstalled. Limp mode has disappeared. I can plant my foot to the floor without the dreaded "ding ding". Hopefully it stays away. Very happy with the car though. Built nice and tough and well looked after. Cheers!

Great that it appears to be gone Jono. Hopefully it stays that way.

**DonDownunder** · 4th January 2017, 12:57 PM

Hello again. You will also find a recent new suspension compressor fitted and a steel sump cover on auto gbox with servicable filter. Brakes just done with new pads and machined disks. Main battery new with engine. Recon alternator late 2015. We had weight issues with GVM when hitched to 3.3 ton cvan and could not have rear 5 seats fitted or reserve tank full hence with running problems we had to sell. Frankly was a great vehicle . We have a new GX 200 series Cruiser now to match the Caravan. I will put a couple of items in the forsale section for local pickup only so keep a lookout. HAPPY NEW YEAR to all

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**LandyAndy** · 4th January 2017, 01:32 PM

Originally Posted by DiscoJono

Cheers Don. Great to know. I just pulled the MAP sensor and it was absolutely filthy. Gave it a good hit with Contact Cleaner and reinstalled. Limp mode has disappeared. I can plant my foot to the floor without the dreaded "ding ding". Hopefully it stays away. Very happy with the car though. Built nice and tough and well looked after. Cheers!

Makes one ponder why this wasn't checked by so called professional mechanics,such a basic item,hopefully its sorted.
If it returns,Im wondering if there is a fuel hose that may be pinched somewhere preventing full flow.Also worth looking at the tank venting seeing it has an aftermarket LR tank fitted.
GOODLUCK.
Andrew

**DonDownunder** · 4th January 2017, 01:48 PM

Originally Posted by LandyAndy

Makes one ponder why this wasn't checked by so called professional mechanics,such a basic item,hopefully its sorted.
If it returns,Im wondering if there is a fuel hose that may be pinched somewhere preventing full flow.Also worth looking at the tank venting seeing it has an aftermarket LR tank fitted.
GOODLUCK.
Andrew

Was cleaned many times

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Ean Austral · 4th January 2017, 02:06 PM

Originally Posted by DiscoJono

Cheers Don. Great to know. I just pulled the MAP sensor and it was absolutely filthy. Gave it a good hit with Contact Cleaner and reinstalled. Limp mode has disappeared. I can plant my foot to the floor without the dreaded "ding ding". Hopefully it stays away. Very happy with the car though. Built nice and tough and well looked after. Cheers!

May be worth spending an hour or so and remove the Y piece intake on the top of the engine and give it a good clean. They get very gunned up from the EGR . IM assuming it still has the EGR connected .

Cheers Ean

**101RRS** · 4th January 2017, 02:25 PM

Originally Posted by Graeme

This needs to be fixed! Does it happen with WOT at slow speeds when insufficient fuel pressure cannot be the cause?

No - only higher speeds usually going up hill when the car is already in a high load situation. I have put it down to the software writers for the ECU only taking into account MAP in high load conditions when unloaded and not taking the additional loads of towing. As a result the engine is really trying to suck in air in these high load conditions causing the MAP to be lower to be lower than the ECU expects so throwing up the fault. (interestingly it does not actually throw up a fault code - I have checked a few times with my FCR). I believe it is the same fault that people have reported when towing vans on cruise where the cruise goes to WOT to maintain speed.

All conjecture of course as I do not have the skills to check this all out. Oh my engine has a BAS remap (increases torque at 3000 rpm but not much extra power) and is blanked - has made no difference as the engine does it before and after the remap.

Now I drive to suit and I rarely see it - afterall you should not be driving uphill towing a caravan over 110kph with a sudden WOT - gradual increase in throttle to full throttle does not cause the fault.

A typical grey nomad, caravanner driving style does not cause the issue.

Oh as an EDIT - on the highway I do not tow in Sport mode - only in tight hilly country roads and I do not recall getting the fault in Sport but maybe just coincidence - next time I tow I might look at this - logic being that in Sport mode the ECU should be looking at lower MAPs as you are being sporty - so maybe the ECU then sees the MAPs it expects.

garry

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