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Coil packs 4.4 v8
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Will W
 


Member Since: 22 Apr 2017
Location: South
Posts: 30

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Zermatt SilverDiscovery 3
Coil packs 4.4 v8

Hello all

I have a 4.4 Aj V8

Do any of you know which coil packs should I buy. I was thinking Delphi or Lucas they cost around £45 but the Lemark ones are only £25 ish

I have several misfires which I'm praying are due to coils and not valves ! ( I have LPG )

I have changed the plugs and don't think there are any air leaks in the air inlet pipes

Cheers Will
  
Post #181752721st May 2017 8:26 pm
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geoffsnook
 


Member Since: 13 Jun 2014
Location: south wales
Posts: 3169

Wales 

You get what you pay for with these cars but genuine ones will be better can you change 1 at a time if you know which are missing to see if it cures that particular miss fire or change a coil pack around ie good with bad and see if miss fire moves Thumbs Up
 Discovery 3 se gone
Range rover sport supercharged here:) 
 
Post #181757822nd May 2017 5:26 am
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Mogwyth
 


Member Since: 03 Oct 2014
Location: Pwllheli
Posts: 3976

Wales 2005 Discovery 3 4.4 V8 HSE Auto Zambezi SilverDiscovery 3

Yep assuming you know which cylinders ares misfiring swap the coil packs round to make sure they are the problem, it's what I did with mine. Buy decent ones.
 ==================================
05 D3 HSE V8 4.4
04 MG TF 135
03 MG TF 115 Cool Blue Edition
02 MG TF 160
00 Hymer B564 Lionheart
1971 Series III 109
 
 
Post #181758422nd May 2017 5:49 am
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bimblephish
 


Member Since: 21 Jul 2016
Location: Wiltshire
Posts: 272

United Kingdom 2006 Discovery 3 4.4 V8 HSE Auto Java BlackDiscovery 3

Hi Will,

Do you have a lube system on your LPG?
  
Post #181762222nd May 2017 8:13 am
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Will W
 


Member Since: 22 Apr 2017
Location: South
Posts: 30

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Zermatt SilverDiscovery 3

Thanks all

I did move some around but not in a planed out way(will borrow diagnostic off friend again and do properly) which I will do. I don't have lube on my lpg.

Will
  
Post #181764422nd May 2017 8:53 am
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geoffsnook
 


Member Since: 13 Jun 2014
Location: south wales
Posts: 3169

Wales 

Just find out which are missing and try and move them around to see if it makes a difference rule them out first does it miss on both gas and petrol and what sort of mileage has yours done Thumbs Up
 Discovery 3 se gone
Range rover sport supercharged here:) 
 
Post #181764822nd May 2017 8:59 am
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bimblephish
 


Member Since: 21 Jul 2016
Location: Wiltshire
Posts: 272

United Kingdom 2006 Discovery 3 4.4 V8 HSE Auto Java BlackDiscovery 3

And how many miles has it done on LPG?
  
Post #181768222nd May 2017 10:27 am
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Will W
 


Member Since: 22 Apr 2017
Location: South
Posts: 30

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Zermatt SilverDiscovery 3

I don't actually know as there is no history but I will try and look again at the mot history maybe it's on there somehow. I assume it's done a fair bit of its 160 k miles on gas.
I am going to swap the coils around tomorrow so I will let you know how that goes, fingers crossed it is a coil.

Thanks Will
  
Post #181792022nd May 2017 6:28 pm
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geoffsnook
 


Member Since: 13 Jun 2014
Location: south wales
Posts: 3169

Wales 

Thats the right way to do it start with the simple/cheap things first Thumbs Up
 Discovery 3 se gone
Range rover sport supercharged here:) 
 
Post #181792822nd May 2017 6:41 pm
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Will W
 


Member Since: 22 Apr 2017
Location: South
Posts: 30

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Zermatt SilverDiscovery 3

Hello all

I have just plugged the disco in to diagnostics and had the following feedback

1 Ignition coil B primary/secondary circuit
2 cylinder 1 misfire
3 cylinder 2 misfire
4 cylinder 7 misfire
5 cylinder 8 misfire
6 random misfire
7 misfire on startup first 1000 revs
8 system too lean (bank 1)

I decided to number the cylinders myself as follows and then moved some of the coil packs but still had exactly the same fault reader feedback.


8 4
7 3
6 2
5 1

When standing at the front of the car and looking back towards front seats.


I swapped 3 and 1 = same diag readout I then swapped them back.
I then swapped 1 and 2 = same diag readout

I then cleared the codes and can't get any faults just says no faults. This will change once I have taken it for a drive as I can still feel it misfiring but until then I will have to wait to swap some more over. It is worth adding that I did randomly change a load of them over some time ago and still got the same diag readout as far as I remember (same cylinders anyway).

Thanks in advance for the use of your mighty collective brain power.

Will
  
Post #181828323rd May 2017 1:42 pm
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Mogwyth
 


Member Since: 03 Oct 2014
Location: Pwllheli
Posts: 3976

Wales 2005 Discovery 3 4.4 V8 HSE Auto Zambezi SilverDiscovery 3

That's doesn't sound too clever, think you might need to do some compression testing etc and be prepared for the worse! Sad could be VSR or I believe some have found valves need adjusting.
 ==================================
05 D3 HSE V8 4.4
04 MG TF 135
03 MG TF 115 Cool Blue Edition
02 MG TF 160
00 Hymer B564 Lionheart
1971 Series III 109
 
 
Post #181829023rd May 2017 2:04 pm
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bimblephish
 


Member Since: 21 Jul 2016
Location: Wiltshire
Posts: 272

United Kingdom 2006 Discovery 3 4.4 V8 HSE Auto Java BlackDiscovery 3

Agreed compression test is a good next step. Unfortunately they are prone to VSR (Valve Seat Regression) if run on LPG without a lube system. If you are able to solve this without needing a set of valves then I would get a lube system installed. Best of luck and hope you get it sorted
  
Post #181830323rd May 2017 2:28 pm
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Will W
 


Member Since: 22 Apr 2017
Location: South
Posts: 30

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Zermatt SilverDiscovery 3

This is my fear but it is what it is. Finding the problem is key then I can do something about it.

Cheers Mogwyth/bimblephish
  
Post #181832823rd May 2017 3:16 pm
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geoffsnook
 


Member Since: 13 Jun 2014
Location: south wales
Posts: 3169

Wales 

Ok i thought it went 1-4 on left hand side and 5-8 was the right hand bank looking from the front of the car back towards the seats so you have a miss fire on 1&2 and 7&8 so 3&4 are good as well as 5&6o try swapping 1&2 with 3&4 to start before the compression testing begins Thumbs Up
 Discovery 3 se gone
Range rover sport supercharged here:) 
 
Post #181834523rd May 2017 4:00 pm
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Will W
 


Member Since: 22 Apr 2017
Location: South
Posts: 30

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Zermatt SilverDiscovery 3

I didn't know order so I made one that would at least show where I had been but thanks the order is handy. I will do that asap but I need the car to register a fault as after clearing it takes a bit for them to show on diagnostics again.
  
Post #181836723rd May 2017 5:08 pm
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