Strange Problem...

I

Ian

Guest

• Mar 29, 2006

• #1

Help....

I have a 1996 V8 Land Rover discovery and it has had a problem for
several months now which I have lost the will to try and fix, but I
have decided its time for another go. The engine will start and run
happily for about 15 -20 minutes at which point it coughs and splutters
before eventually stopping. If you then leave it for 20 minutes or so
and then restart it it will run for the same sort of time before
stopping again. I have replaced all the leads and plugs, the ignition
module, the distr cap and arm and the air flow meter (which did have a
fault) how ever the problem still persists, anyone got any ideas...??

 

A

Austin Shackles

Guest

• Mar 29, 2006

• #2

On or around 29 Mar 2006 04:24:17 -0800, "Ian" <[email protected]>
enlightened us thusly:

>Help....
>
>I have a 1996 V8 Land Rover discovery and it has had a problem for
>several months now which I have lost the will to try and fix, but I
>have decided its time for another go. The engine will start and run
>happily for about 15 -20 minutes at which point it coughs and splutters
>before eventually stopping. If you then leave it for 20 minutes or so
>and then restart it it will run for the same sort of time before
>stopping again. I have replaced all the leads and plugs, the ignition
>module, the distr cap and arm and the air flow meter (which did have a
>fault) how ever the problem still persists, anyone got any ideas...??

summat on the fuel side, then. check the pump - there are I believe figures
for pump delivery. There's also a pump control relay somewhere, but the
symptoms aren't really typical for an erratic supply to the fuel pump. The
relay takes signals from the ECU (I think, on a hotwire) which tell it the
engine's turning. If it fails to get these signals then it shuts the fuel
supply off. It's just possible that something's overheating in that and
causing it to shut off after 20 minutes.

There's a pickup filter in the tank, and also the fuel filter in the fuel
line. And the pump can go senile as well.

sounds like fuel starvation, your problem is to work out why.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"Festina Lente" (Hasten slowly) Suetonius (c.70-c.140) Augustus, 25

 

J

Joskin

Guest

• Mar 29, 2006

• #3

"Ian" <[email protected]> wrote in message
news:[email protected]...
> Help....
>
> I have a 1996 V8 Land Rover discovery and it has had a problem for
> several months now which I have lost the will to try and fix, but I
> have decided its time for another go. The engine will start and run
> happily for about 15 -20 minutes at which point it coughs and splutters
> before eventually stopping. If you then leave it for 20 minutes or so
> and then restart it it will run for the same sort of time before
> stopping again. I have replaced all the leads and plugs, the ignition
> module, the distr cap and arm and the air flow meter (which did have a
> fault) how ever the problem still persists, anyone got any ideas...??
>

Do these models have a *breather* in the fuel tank?
Is it blocked?
Are you creating a vacuum in the tank? (an Astra I had sucked so hard it
collapsed the tank)
Try it with the fuel cap removed.

Joskin

 

A

Austin Shackles

Guest

• Mar 29, 2006

• #4

On or around Wed, 29 Mar 2006 14:05:25 +0100, "Joskin" <[email protected]>
enlightened us thusly:

>"Ian" <[email protected]> wrote in message
>news:[email protected]...
>> Help....
>>
>> I have a 1996 V8 Land Rover discovery and it has had a problem for
>> several months now which I have lost the will to try and fix, but I
>> have decided its time for another go. The engine will start and run
>> happily for about 15 -20 minutes at which point it coughs and splutters
>> before eventually stopping. If you then leave it for 20 minutes or so
>> and then restart it it will run for the same sort of time before
>> stopping again. I have replaced all the leads and plugs, the ignition
>> module, the distr cap and arm and the air flow meter (which did have a
>> fault) how ever the problem still persists, anyone got any ideas...??
>>
>
>Do these models have a *breather* in the fuel tank?
>Is it blocked?
>Are you creating a vacuum in the tank? (an Astra I had sucked so hard it
>collapsed the tank)
>Try it with the fuel cap removed.
>

There should be 4 breather valve things in the tank - although they all
connect to one pipe, which could be blocked. Worth a check, though, it's an
easy solution if that's what it is.
--
Austin Shackles. www.ddol-las.net my opinions are just that
Beyond the horizon of the place we lived when we were young / In a world
of magnets and miracles / Our thoughts strayed constantly and without
boundary / The ringing of the Division bell had begun. Pink Floyd (1994)

 

I

Ian

Guest

• Mar 29, 2006

• #5

I have tried running it with the fuel cap off and the problem still
seemed to persist which suggested to me the breathers were probably OK.
Austin you mention a fuel pickup filter in the tank, how would I get
to this???

 

H

Hirsty's

Guest

• Mar 29, 2006

• #6

> I have a 1996 V8 Land Rover discovery and it has had a problem for
> several months now which I have lost the will to try and fix, but I
> have decided its time for another go. The engine will start and run
> happily for about 15 -20 minutes at which point it coughs and splutters
> before eventually stopping. If you then leave it for 20 minutes or so
> and then restart it it will run for the same sort of time before
> stopping again. I have replaced all the leads and plugs, the ignition
> module, the distr cap and arm and the air flow meter (which did have a
> fault) how ever the problem still persists, anyone got any ideas...??
>

Friend had a Corvette 427 some time ago and had a similar problem; he traced
it to a small copper mesh filter in the carbs. However I assume yours is V8i
in which case this is nonsense.

 

A

Austin Shackles

Guest

• Mar 29, 2006

• #7

On or around 29 Mar 2006 05:36:28 -0800, "Ian" <[email protected]>
enlightened us thusly:

>I have tried running it with the fuel cap off and the problem still
>seemed to persist which suggested to me the breathers were probably OK.
> Austin you mention a fuel pickup filter in the tank, how would I get
>to this???

remove all the carpets etc. in the boot.

remove about 6 screws holding circular cover in the boot floor.

remove half a ton of crud from the top of the tank (else it'll get inside).

disconnect pipes from the pump/gauge unit, also wiring including IIRC an
earth wire.

unscrew big red plastic retaining ring.

lift pump/gauge unit out of tank.

Helps to have a vacuum cleaner with a pipe and a crevice nozzle to suck up
the crud from the tank top.

 

Q

QD Steve

Guest

• Mar 30, 2006

• #8

"Ian" <[email protected]> wrote in message
news:[email protected]...
> Help....
>
> I have a 1996 V8 Land Rover discovery and it has had a problem for
> several months now which I have lost the will to try and fix, but I
> have decided its time for another go. The engine will start and run
> happily for about 15 -20 minutes at which point it coughs and splutters
> before eventually stopping. If you then leave it for 20 minutes or so
> and then restart it it will run for the same sort of time before
> stopping again. I have replaced all the leads and plugs, the ignition
> module, the distr cap and arm and the air flow meter (which did have a
> fault) how ever the problem still persists, anyone got any ideas...??
>
Had the same problem on a beemer. Traced it a faulty sensor on the exhaust
pipe just below the manifold. Sending the wrong signals to the ecu. when it
got hot. When replaced, everthing worked just fine.
Steve W (in Aus)

 

I

Ian

Guest

• Mar 30, 2006

• #9

Just phoned a local specialist and they suggested that it was the inlet
manifold tempreature senor.... Does anyone know what this part looks
like or if its obvious, if not i shall have to try and find myself a
workshop manual....

 

A

Austin Shackles

Guest

• Mar 30, 2006

• #10

On or around Wed, 29 Mar 2006 23:43:24 GMT, "QD Steve"
<[email protected]> enlightened us thusly:

>
>"Ian" <[email protected]> wrote in message
>news:[email protected]...
>> Help....
>>
>> I have a 1996 V8 Land Rover discovery and it has had a problem for
>> several months now which I have lost the will to try and fix, but I
>> have decided its time for another go. The engine will start and run
>> happily for about 15 -20 minutes at which point it coughs and splutters
>> before eventually stopping. If you then leave it for 20 minutes or so
>> and then restart it it will run for the same sort of time before
>> stopping again. I have replaced all the leads and plugs, the ignition
>> module, the distr cap and arm and the air flow meter (which did have a
>> fault) how ever the problem still persists, anyone got any ideas...??
>>
>Had the same problem on a beemer. Traced it a faulty sensor on the exhaust
>pipe just below the manifold. Sending the wrong signals to the ecu. when it
>got hot. When replaced, everthing worked just fine.
>Steve W (in Aus)
>

not sure the '96 V8 will have lambda control; it might, in which case this
is also a possibility. The V8 has 2 lambda sensors if it's got 'em , I
think.
--
Austin Shackles. www.ddol-las.net my opinions are just that
In Touch: Get in touch with yourself by touching yourself.
If somebody is watching, stop touching yourself.
from the Little Book of Complete B***ocks by Alistair Beaton.

 

A

Anthony

Guest

• Apr 2, 2006

• #11

Not that much nonsense really, look for an inline fuel filter, usually
hidden in some bastard of a place up in the rear chassis area ( well mine
was, but then it was imported second hand from Japan!)
"Hirsty's" <[email protected]> wrote in message
news:[email protected]...
>
>
> > I have a 1996 V8 Land Rover discovery and it has had a problem for
> > several months now which I have lost the will to try and fix, but I
> > have decided its time for another go. The engine will start and run
> > happily for about 15 -20 minutes at which point it coughs and splutters
> > before eventually stopping. If you then leave it for 20 minutes or so
> > and then restart it it will run for the same sort of time before
> > stopping again. I have replaced all the leads and plugs, the ignition
> > module, the distr cap and arm and the air flow meter (which did have a
> > fault) how ever the problem still persists, anyone got any ideas...??
> >
>
> Friend had a Corvette 427 some time ago and had a similar problem; he
traced
> it to a small copper mesh filter in the carbs. However I assume yours is
V8i
> in which case this is nonsense.
>
>

 

J

jason-h

Guest

• Apr 2, 2006

• #12

Ian wrote:
>Just phoned a local specialist and they suggested that it was the inlet
>manifold tempreature senor.... Does anyone know what this part looks
>like or if its obvious, if not i shall have to try and find myself a
>workshop manual....

Hi Ian on my RR the intake temp sensor is a multi pin plug and sit in the
middle of the intake manifold hope this helps (i beleave it is brown in)
jason-h