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LRO53

Member Since: 07 Jan 2012
Location: Australia
Posts: 16

Td5 Defender Missfire in Heavy monsoon rain

Hello all

2005 Defender 90 XS

I just returned from a 2400km trip down to New South Wales in Australia. At one period on the Pacific Hwy i got very heavy rain. When i say heavy i mean to the point of wipers on max but still very hard to see. You don't get this kind of rain in UK.

When this happened for a brief 5-10 min i started to get a missfire and loss of power. I was doing around 80kph (50mph) when it started but slowing down did not seem to change the issue.

Suddenly when the rain eased power was restored and i was off again. This only happened when it rained really really heavy.

So far i have checked.

- Oil in ECU plug = One tiny tiny droplet found but i had never Disconnected the plug in the life of the vehicle so i suspect that's not bad. Also once cleaning this small dropet the rain still caused an issue.

- Watched the throttle pedel area for water when missfiring was occurring for water. No water found.

I'm out of ideas but when i opened the bonnet after pulling over everything looked good and dry!

21st Mar 2012 10:48am

wslr

Member Since: 18 Jul 2010
Location: Wellington, Somerset
Posts: 581

Hi: Have you got a RAI fitted?

21st Mar 2012 11:12am

LRO53

Member Since: 07 Jan 2012
Location: Australia
Posts: 16

wslr wrote:
Hi: Have you got a RAI fitted?

RAI? i don't know what this is?

21st Mar 2012 11:13am

wslr

Member Since: 18 Jul 2010
Location: Wellington, Somerset
Posts: 581

Sorry - Raised Air Intake.

21st Mar 2012 11:14am

LRO53

Member Since: 07 Jan 2012
Location: Australia
Posts: 16

wslr wrote:
Sorry - Raised Air Intake.

No it's just the standard factory side entry.

21st Mar 2012 11:15am

wslr

Member Since: 18 Jul 2010
Location: Wellington, Somerset
Posts: 581

Check the air filter and see if it has been misshaped? Just thinking aloud, but dense air and water droplets hitting the hotwire MAF sensor could explain both the misfire and the sudden return to normal once the rain eased a little.

21st Mar 2012 11:18am

LRO53

Member Since: 07 Jan 2012
Location: Australia
Posts: 16

Will check it now..

21st Mar 2012 11:19am

LRO53

Member Since: 07 Jan 2012
Location: Australia
Posts: 16

This could be it? You can see straight through the filter..

Click image to enlarge

Click image to enlarge
[/img]

21st Mar 2012 11:35am

wslr

Member Since: 18 Jul 2010
Location: Wellington, Somerset
Posts: 581

Is there any sign of there being water sitting in the bottom of the air intake box?

21st Mar 2012 11:53am

LRO53

Member Since: 07 Jan 2012
Location: Australia
Posts: 16

Click image to enlarge

Does not look like any water has got in? Still dust in the bottom.

21st Mar 2012 12:10pm

wslr

Member Since: 18 Jul 2010
Location: Wellington, Somerset
Posts: 581

The air filter looks as though it has been wet at some point.

Can you remove the MAF sensor and just check to see if there is any debris either on the element or caught in the protective gauze/mesh?

21st Mar 2012 12:40pm

LRO53

Member Since: 07 Jan 2012
Location: Australia
Posts: 16

Click image to enlarge

Looks ok to me.

I will get a screw driver out tomorrow and remove it proper so i can see the other end.

21st Mar 2012 12:58pm

diesel_jim

Member Since: 13 Oct 2008
Location: hiding
Posts: 6038

With normal LR build tolerances, i'm suprised you never drowned inside your 90

21st Mar 2012 3:01pm

marcusjclifford

Member Since: 21 Jan 2012
Location: Scotland
Posts: 7

My guess would be the air filter getting damp, when damp less air can be drawn through it so the engine is in effect strangled of oxygen so there is significantly reduced power. It wouldn't need to be so wet as to accumulate actual water in the air box.

I don't know if that would be enough to cause a miss-fire though.

Once the rain stopped the air filter would dry quickly as air is drawn through it so it would not necessarily be still damp when you checked it, although as pointed out before it looks like it may have been damp in the past.

22nd Mar 2012 12:19pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5424

2006 Defender 110 Td5 USW Zermatt Silver

Agree with above as I have suffered from the same.

The air filter gets damp, reducing the amount of air flow to the engine. In my case it also killed a two day old £100 MAF

You can see that your air filter has been wet

Andy

23rd Mar 2012 7:59am

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