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Crankshaft position sensor ring misaligned?
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AndreasG
 


Member Since: 10 Mar 2021
Location: Nicosia
Posts: 73

Cyprus 2006 Discovery 3 TDV6 HSE Auto Atacama SandDiscovery 3
Crankshaft position sensor ring misaligned?

Good afternoon to all,

I am currently having some trouble with cold/first starts (more specifically) of my car.

On a quick overlook the symptoms are that the car will not start on the first go, but on the second try it fires up. This happens in the morning and after it has been sitting for some time (after i finish work for instance). Outside temp is currently around 15 degrees so glow plugs see not to be the issue. It idles rough for about 5-10 seconds and then seems ok. It seems to have a flat spot on acceleration after about 2500 rpm and consumption has worsened.

Yesterday morning it started on the first go and was pulling like a train! After work same thing happened again.

Symptoms can be read in the below threat.

https://disco3.co.uk/forum/cold-starting-i...02879.html


I wanted to ask if the crankshaft position sensor ring was not placed correctly or was placed without the special tool or even damaged while removing and re-fitting back will the car have these symptoms or would it simply not start?

Could these be symptoms of a misaligned crankshaft position sensor or ring?

I am now in desperate need of help as there are no real specialists around and the garage that did the gearbox say they did not touch anything on the engine.

Thank you all in advance

Here is a link to the video of the car starting up

https://youtube.com/shorts/Ljx22fNMoaM?feature=share

* if a 'duplicate' post is not allowed please delete or let me know and I will delete. Discovery 3, TDV6, HSE, 2006
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Post #231883915th Dec 2022 3:08 pm
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ekwan
 


Member Since: 24 Apr 2016
Location: P Jaya
Posts: 25

Malaysia 2008 LR3 TDV6 HSE Auto Scotia GreyLR3

Why do you specifically suspect it's an issue with the crankshaft timing ring in the first place? It is something that doesn't ever go wrong if left untouched.  
Post #231892316th Dec 2022 2:10 am
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AndreasG
 


Member Since: 10 Mar 2021
Location: Nicosia
Posts: 73

Cyprus 2006 Discovery 3 TDV6 HSE Auto Atacama SandDiscovery 3

Good morning,

The rear crank seal was changed while the gearbox was out and I’m not quite sure how it was fitted back. I spoke with 3 different mechanics and they all concluded to that.

I’m also waiting for a genuine LR fuel filter to arrive today since I’ve been reading a lot about non genuine ones as well. Discovery 3, TDV6, HSE, 2006
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Post #231892716th Dec 2022 6:56 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10361

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

If it’s running, I would say it’s not the crank sensor.

Check fueling first.  
Post #231893016th Dec 2022 7:48 am
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AndreasG
 


Member Since: 10 Mar 2021
Location: Nicosia
Posts: 73

Cyprus 2006 Discovery 3 TDV6 HSE Auto Atacama SandDiscovery 3

Thank you Pete K.

Everyone I asked here (not the forum) keeps basing their opinion of 'it would start but won't run properly' on other car brands' experience. Discovery 3, TDV6, HSE, 2006
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Post #231893116th Dec 2022 8:07 am
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AndreasG
 


Member Since: 10 Mar 2021
Location: Nicosia
Posts: 73

Cyprus 2006 Discovery 3 TDV6 HSE Auto Atacama SandDiscovery 3

Update:

Just received the car last night from the shop that did my gearbox. Went back in and replaced the crankshaft position sensor trigger ring with a new one using the special tool.

So far so good. No issues on start-up and car runs so much smoother now. Power back to what it was before.

Mechanic said the trigger ring was off by about 20 degrees (I have no idea if there is a "safety margin" of +/- degrees and frankly, how it started at all if it was off by that much!) but all the symptoms seem to have vanished upon last night's drive and today's.

Only thing left to see now is how the MPG will turn out to eliminate all symptoms Discovery 3, TDV6, HSE, 2006
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Post #232211110th Jan 2023 10:01 am
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