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How long should it crank before firing?

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Ratty43

Member Since: 28 Nov 2018
Location: PENZANCE
Posts: 51

2005 Discovery 3 TDV6 HSE Auto Tonga Green

How long should it crank before firing?

Bit of an odd question but my newly acquired Discovery 3 2.7 TD HSE cranks for longer than I would expect before starting, cold it is probably around 3 seconds but warm after standing for an hour or two it still takes a couple of seconds before firing.

There isn't any white smoke worth talking about when it fires and its fairly smooth for a diesel although the response is a bit sluggish for the first mile or so which seems to be a glow plug issue but I would have expected this to also cause a cloud of smoke when it fires.

Injector values are all well within tolerances at between 900 and 1200 and the fuel pressure shows 0.4 bar on my diagnostic scanner with the ignition on before starting. Also returned 31mpg on a 650 mile round trip on hilly A roads so seems healthy otherwise.

I did wonder if the fuel pressure regulator could fail and allow the pressure in the rail to drop to zero as I understand these should hold rail pressure at 100bar, if this wasn't the case would there be a delay in starting whilst the HPFP raises pressure in the rail again?

Having not had one before I don't know if they normally start as the key is turned or if a bit of turning over first is completely normal!

Any guidance gratefully received.

Cheers, Barney

5th Dec 2018 12:59 pm

Pete K

Member Since: 15 Jan 2016
Location: GL
Posts: 10365

2005 Discovery 3 TDV6 HSE Auto Rimini Red

What's the CCA figure on the label of the battery that is fitted?

5th Dec 2018 1:05 pm

Ratty43

Member Since: 28 Nov 2018
Location: PENZANCE
Posts: 51

Sorry, I should have mentioned the battery was one of my first suspicions so it was replaced a month ago with the Exide one that is highly recommended on here with 900CCA. That has made it turn over faster but not changed the time it takes to fire.

5th Dec 2018 1:12 pm

rrhool

Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4400

2007 Discovery 3 TDV6 SE Manual Zermatt Silver

Re: How long should it crank before firing?

Ratty43 wrote:

Having not had one before I don't know if they normally start as the key is turned or if a bit of turning over first is completely normal!

Any guidance gratefully received.

Mine starts within the first revolution (I guess). I imagine that's how it should be.

Glow plugs? Richard

D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.

Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone

5th Dec 2018 2:10 pm

lynalldiscovery

Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274

2006 Discovery 3 TDV6 Metropolis LE Auto Bonatti Grey

Cold straight away to a second or two as the temp drops, hot straight away.

5th Dec 2018 4:09 pm

Ratty43

Member Since: 28 Nov 2018
Location: PENZANCE
Posts: 51

Thanks both, that's what I thought it should be doing. I would have thought that it would start straight away when warm even without the glow plugs working, it doesn't start instantly even if I've only left it for a few minutes although it is much faster to catch.

5th Dec 2018 4:11 pm

Ratty43

Member Since: 28 Nov 2018
Location: PENZANCE
Posts: 51

I think I've found the cause so have started a new post here: https://www.disco3.co.uk/forum/post2007272.html#2007272

8th Dec 2018 8:15 pm

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