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Old 12-28-2005, 06:01   #1 (permalink)
Judith
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300Tdi - Slow start in cold weather - New glow plugs needed?

My (1997 ES) 300Tdi Disco has always been a good starter but has been a
bit slow in the recent cold weather. The engine turns on the starter
but it can take up to a dozen turns before it starts. The battery is
fine - I've checked it with a meter and don't hear any slowing down of
the starter before the engine comes to life.

I have heard that the 300Tdi doesn't tend to need its glow plugs unless
the weather is cold, so is it likely that one, some or all of my plugs
need replacing?

Although I've had this LR for over three years, I grew up with petrol
Series IIIs and still have a bit of trouble understanding diesels. For
a start, I thought I'd just be able to unscrew the glow plugs and have
a look at them (like I could with my spark plugs) but it seems to be a
right to-do even to have a look.

I have not been charged for glow plugs at any of my services, so I can
only assume I've had the same ones for the last 60,000 miles. Perhaps
I should just get them changed anyway; it's probably cheaper than
getting them checked.

Judith

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Old 12-28-2005, 07:01   #2 (permalink)
Andrew Renshaw
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

I would get the glow plugs changed. About 30 tops for them and maybe an
hour at a garage to fit them - I recently changed mine in my 110 and it made
a difference.

Andy


"Judith" <nospamforgoofif@aol.com> wrote in message
news:1135778161.701593.21860@z14g2000cwz.googlegroups.com...
> My (1997 ES) 300Tdi Disco has always been a good starter but has been a
> bit slow in the recent cold weather. The engine turns on the starter
> but it can take up to a dozen turns before it starts. The battery is
> fine - I've checked it with a meter and don't hear any slowing down of
> the starter before the engine comes to life.
>
> I have heard that the 300Tdi doesn't tend to need its glow plugs unless
> the weather is cold, so is it likely that one, some or all of my plugs
> need replacing?
>
> Although I've had this LR for over three years, I grew up with petrol
> Series IIIs and still have a bit of trouble understanding diesels. For
> a start, I thought I'd just be able to unscrew the glow plugs and have
> a look at them (like I could with my spark plugs) but it seems to be a
> right to-do even to have a look.
>
> I have not been charged for glow plugs at any of my services, so I can
> only assume I've had the same ones for the last 60,000 miles. Perhaps
> I should just get them changed anyway; it's probably cheaper than
> getting them checked.
>
> Judith
>



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Old 12-28-2005, 07:01   #3 (permalink)
Steve
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

Judith wrote:
I thought I'd just be able to unscrew the glow plugs and have
> a look at them (like I could with my spark plugs) but it seems to be a
> right to-do even to have a look.


You COULD look at them, but unless they are utterly knackered, you can't
see anything. You need to pull 'em and connect them to the battery for a
few seconds. You should see a good bright glow close to the tip of the
plug, if you don't, then change them, its not worth changing single
plugs for the cost. Don't know where you are, but Richard at Beamends in
the UK does a set of plugs for 4 x 3.76 GBP !

Steve
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Old 12-28-2005, 07:01   #4 (permalink)
Graham Carter
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

"Judith" <nospamforgoofif@aol.com> wrote in message
news:1135778161.701593.21860@z14g2000cwz.googlegroups.com...
> My (1997 ES) 300Tdi Disco has always been a good starter but has been a
> bit slow in the recent cold weather. The engine turns on the starter
> but it can take up to a dozen turns before it starts. The battery is
> fine - I've checked it with a meter and don't hear any slowing down of
> the starter before the engine comes to life.
>
> I have heard that the 300Tdi doesn't tend to need its glow plugs unless
> the weather is cold, so is it likely that one, some or all of my plugs
> need replacing?
>
> Although I've had this LR for over three years, I grew up with petrol
> Series IIIs and still have a bit of trouble understanding diesels. For
> a start, I thought I'd just be able to unscrew the glow plugs and have
> a look at them (like I could with my spark plugs) but it seems to be a
> right to-do even to have a look.
>
> I have not been charged for glow plugs at any of my services, so I can
> only assume I've had the same ones for the last 60,000 miles. Perhaps
> I should just get them changed anyway; it's probably cheaper than
> getting them checked.
>
> Judith
>


Glow plugs are probably most likely. However, do you park onj a slope with
your engine pointing up the slope? Mine at the moment takes about 10
seconds to start if I do this - park the other way round, it starts on the
first turn.

My mechanic here replaced the lift fuel pump the last time mine did this -
he said the fuel was draining back into the tank overnight and had to be
pumped back up again. He said it was a sign of the diaphragm failing.

The fuel lift pump doesn't do much once the engine is running I believe.
I'm sure there was a post on this newsgroup that said the injection pump
could suck the fuel through once the engine was running. So you probably
wouldn't notice any other symptoms.

Cheers!
Graham Carter


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Old 12-28-2005, 11:01   #5 (permalink)
Hugh Hogan
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

My 98 2.5 Disco has been behaving (mis-behaving) like that over the
past few weeks. I think I will try backing into the garden before I
change the glow plugs.

Happy New Year all

Hugh

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Old 12-28-2005, 13:02   #6 (permalink)
Austin Shackles
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

On or around Wed, 28 Dec 2005 16:24:22 +0200, "Graham Carter"
<grahamcarter@hotmail.com> enlightened us thusly:

>> I have not been charged for glow plugs at any of my services, so I can
>> only assume I've had the same ones for the last 60,000 miles. Perhaps
>> I should just get them changed anyway; it's probably cheaper than
>> getting them checked.


Glow plugs last until they fail. They're not, AFAIK, a service item.

>>
>> Judith
>>

>
>Glow plugs are probably most likely. However, do you park onj a slope with
>your engine pointing up the slope? Mine at the moment takes about 10
>seconds to start if I do this - park the other way round, it starts on the
>first turn.


surely this would apply in warmer weather too? if it's a recent symptom
only in cold weather, I'd still go with glow plugs. It's quite possible to
have an engine that starts fine without plugs, and then the temperature
drops about 3 degrees and it doesn't.

You can test 'em, as someone says: pull plug, connect fattish wire (a jump
lead is good) to the top, connect other end of FW to battery +, grab plug
with pliers and rest the metal casing on battery -. should take about 5
seconds to start glowing at the tip. You hold it with pliers 'cos it gets
hot (if it's working) and be careful where you put it down afterwards.


sender on the solar collector on our roof says -9.3 C tonight.
--
Austin Shackles. www.ddol-las.net my opinions are just that
Blue: The sky is blue for a reason. Blue light is a source of strength
and harmony in the cosmos. Create a blue light in your life by
telephoning the police
from the Little Book of Complete B***ocks by Alistair Beaton.
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Old 12-28-2005, 14:01   #7 (permalink)
Dougal
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

Andrew Renshaw wrote:

> I would get the glow plugs changed. About 30 tops for them and maybe an
> hour at a garage to fit them - I recently changed mine in my 110 and it made
> a difference.
>
> Andy


Diagnose first, spend money later - unless you are the Government
spending our money.
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Old 12-28-2005, 15:01   #8 (permalink)
hugh
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

In message <lqu5r1t2offigdt47t91e0fp75ji085mke@4ax.com>, Austin Shackles
<austinNOSPAM@ddol-las.net> writes
>On or around Wed, 28 Dec 2005 16:24:22 +0200, "Graham Carter"
><grahamcarter@hotmail.com> enlightened us thusly:
>
>>> I have not been charged for glow plugs at any of my services, so I can
>>> only assume I've had the same ones for the last 60,000 miles. Perhaps
>>> I should just get them changed anyway; it's probably cheaper than
>>> getting them checked.

>
>Glow plugs last until they fail. They're not, AFAIK, a service item.
>
>>>
>>> Judith
>>>

>>
>>Glow plugs are probably most likely. However, do you park onj a slope with
>>your engine pointing up the slope? Mine at the moment takes about 10
>>seconds to start if I do this - park the other way round, it starts on the
>>first turn.

>
>surely this would apply in warmer weather too? if it's a recent symptom
>only in cold weather, I'd still go with glow plugs. It's quite possible to
>have an engine that starts fine without plugs, and then the temperature
>drops about 3 degrees and it doesn't.
>
>You can test 'em, as someone says: pull plug, connect fattish wire (a jump
>lead is good) to the top, connect other end of FW to battery +, grab plug
>with pliers and rest the metal casing on battery -. should take about 5
>seconds to start glowing at the tip. You hold it with pliers 'cos it gets
>hot (if it's working) and be careful where you put it down afterwards.
>
>

Doesn't the 300 Tdi have a relay which controls the glow plugs in some
way?


--
hugh
Reply to address is valid at the time of posting
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Old 12-28-2005, 16:01   #9 (permalink)
Judith
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

On Wed, 28 Dec 2005 16:24:22 +0200, "Graham Carter"
<grahamcarter@hotmail.com> wrote:

>Glow plugs are probably most likely. However, do you park onj a slope with
>your engine pointing up the slope? Mine at the moment takes about 10
>seconds to start if I do this - park the other way round, it starts on the
>first turn.


No, I park on a slope ..... but with my engine pointing DOWN the
slope!

Judith
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Old 12-28-2005, 16:01   #10 (permalink)
Judith
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

On Wed, 28 Dec 2005 20:58:06 +0000, Austin Shackles
<austinNOSPAM@ddol-las.net> wrote:

>>Glow plugs are probably most likely. However, do you park onj a slope with
>>your engine pointing up the slope? Mine at the moment takes about 10
>>seconds to start if I do this - park the other way round, it starts on the
>>first turn.

>
>surely this would apply in warmer weather too? if it's a recent symptom
>only in cold weather, I'd still go with glow plugs. It's quite possible to
>have an engine that starts fine without plugs, and then the temperature
>drops about 3 degrees and it doesn't.


Yes, that's how it seems. Above, say, 2 deg C - fine. Around 0 deg C
- bit iffy. Below -2 deg C - cross fingers! It hasn't not started
yet, but I need to do something about it soon as there's obviously
something not right. Most people seem to think it's the plugs and I
reckon a new set after (at least) 60,000 miles wouldn't be too much of
an extravagance.

Judith
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