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DivingDarin
Member Since: 17 Mar 2013
Location: Chingford
Posts: 12
  
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| Car wont start after a long journey |
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Having completed all the suspension work my disco is now directing me to the engine side.
After a long(ish) journey compared to the shops and back ie 40 plus miles, my disco refuses to start! Oh she turns over ok but just refuses to ignite. Initially i could turn to pos 2, wait 30 secs then start but it seems now i either wait an hour or disconnect then reconnecr the battery.
I'll check what codea if any are present but i have seen several similar threads suggesting the crank position sensor, the fuel temp sensor, the low pressure fuel pump, the high pressure fuel pump, fuel filter wtc etc ...
I'm olen to following a good diagnostic sequence if anyone has any suggestions... failing that i might tune into lr time ... you never know
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 20th Jul 2021 12:26 am |
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aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2463
  
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The fault codes will hopefully show you the correct diagnostic path, without them its just guess work. Andrew
D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE
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| 20th Jul 2021 5:25 am |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1818
 
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Is there fuel at the Schrader valve
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| 20th Jul 2021 8:33 am |
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DivingDarin
Member Since: 17 Mar 2013
Location: Chingford
Posts: 12
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There is is fuel at the schrader valve ... so i decided check all the connections and found the fuel temp sensor not fully engaged (could be something to do with 17 years of wear and tear).
Generally she starts and stops with no problems at all with short journeys ... its only the long ones and then a hard reset seems to do the job.
I checked the codes and none were present!!! A conundrum... nothing management related suggests air but a hard reset suggests management.
I'll monitor and post
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| 20th Jul 2021 12:53 pm |
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ds23man
Member Since: 19 Jan 2013
Location: Ainum
Posts: 227
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Ignition key barrel coil for the immobiliser . If there is a open circuit when hot, the engine will turn over but not start. This does not throw a fault code. Seen this also on other vehicles like Audi or VW. This coil also charges your key so it will heat up at long trips. Citroen DS23IE
Audi A6 2.4 V6 Avant Quatro (1998)
Audi 80 2.6 v6 Cabriolet (1996)
John Deere 4240S
McCormick 323
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| 20th Jul 2021 1:21 pm |
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DivingDarin
Member Since: 17 Mar 2013
Location: Chingford
Posts: 12
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I'll look into ignition key coil... the fuel temp sensor seems to be a res herring as the old girl decided not to restart after a 20 mins journey in 30 degrees... not even after a hard reset.
I will try and eliminate the high pressure fuel pump ... not sure when the belt and tensioner was last replaced ..definitely more the 100k ago
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| 20th Jul 2021 5:03 pm |
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Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 13018
 
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had a Fiat X1/9 many years ago ... fuel pump diaphragm went porous and allowed hot fuel (petrol) to go back into the tank, meaning a hot start had to prime itself ... which didn't always happen.
granted Disco is diesel, but could similar happen ?
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| 20th Jul 2021 8:38 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8225
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I had the same problem with a Merc 270, took ages to start in hot weather after a pit stop, found to be fuel syphoning back to the tank when stood, I don’t know if this can happen on a Disco as the pump is in the tank. It can when others can't,
It will when others won't,
It goes where others don't.
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| 21st Jul 2021 8:04 am |
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aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2463
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I have seen faulty fuel filters do this but the fact it will start if you disconnect and reconnect the battery makes me think its electrical Andrew
D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE
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| 21st Jul 2021 10:37 am |
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jenseneverest
Member Since: 12 Jun 2017
Location: somewhere
Posts: 769
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check the live data of the fuel rail pressure when cranking over and it wont start.
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| 21st Jul 2021 10:44 am |
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