R

Richard

Guest
Last summer our 3.9 Discovery broke down several times. It started again
after about 5 mins and never did find the problem. Yesterday it did it again
several times. The engine was cold as I had only done about 2 miles. Each
time I eased off the throttle the revs would just die. If I kept the revs up
when stopped it was ok.
Anyone got any ideas before I start changing things for the sake of it?
Thanks
Richard


 
Um...sounds a bit like the old "dodgy spider" syndrome (crap soldering in
the the PCB). When it does die, will it not restart for a period - if so,
you can jury rig the coil to the battery to bypass the immobiliser - if it
starts - that's the problem. ISTR that Rogers of Bedford have a nice fix for
this - that doesn;t involve buying the new stupid LR fob replacement at
£300..!

--
Neil
http://www.mud-club.com


 
Neil,
I did wonder about the 'dodgy spider thingy' but then I thought why would it
keep going if I managed to keep the revs up?
BTW it does the same on LPG and petrol so I'm assuming its more of an
electrical problem rather than fuel.
Richard

"Neil Brownlee" <n.brownlee@pccontrolNOSPAMsystems.com> wrote in message
news:cbc07k$n8e$1@hercules.btinternet.com...
> Um...sounds a bit like the old "dodgy spider" syndrome (crap soldering in
> the the PCB). When it does die, will it not restart for a period - if so,
> you can jury rig the coil to the battery to bypass the immobiliser - if it
> starts - that's the problem. ISTR that Rogers of Bedford have a nice fix
for
> this - that doesn;t involve buying the new stupid LR fob replacement at
> £300..!
>
> --
> Neil
> http://www.mud-club.com
>
>


 
Richard,

Mine was intermittant - the local LR garage blamed all sorts of electrical
things....but it was the spider - it;s the heart of thebeast ;-) Only has to
rattle a bit. Even the AA diagnosed a faulty inlet manifold gasket?!?!?!?!

--
Neil


 
"Richard" <richardsemailNOSPAM@blueyonder.co.uk> wrote in message
news:4jfCc.633$8x5.6327393@news-text.cableinet.net...
> Last summer our 3.9 Discovery broke down several times. It started again
> after about 5 mins and never did find the problem. Yesterday it did it
again
> several times. The engine was cold as I had only done about 2 miles. Each
> time I eased off the throttle the revs would just die. If I kept the revs
up
> when stopped it was ok.
> Anyone got any ideas before I start changing things for the sake of it?
> Thanks
> Richard

I'd take a look at the air flow meter, between the air intake and the
engine. This isn't because I know one end of a V8 from the other, but
rather that I had a similar problem on my 4.6 and that's what it was. If
you can find a friend to swap with, you'll soon find out.

Of course, now somebody's going to point out that the 3.9 doesn't *have* an
air flow meter and I'll look a complete berk.

David


 
DF> Of course, now somebody's going to point out that the 3.9 doesn't
DF> *have* an air flow meter and I'll look a complete berk.

It does have one ;-) And I rather luckily have a working spare here ... so
Richard .. where are you based?

--
Neil


 
I am in Maidstone, Kent.
Whereabouts are you ?
Richard


"Neil Brownlee" <n.brownlee@pccontrolNOSPAMsystems.com> wrote in message
news:cbc3h5$rln$1@hercules.btinternet.com...
> DF> Of course, now somebody's going to point out that the 3.9 doesn't
> DF> *have* an air flow meter and I'll look a complete berk.
>
> It does have one ;-) And I rather luckily have a working spare here ... so
> Richard .. where are you based?
>
> --
> Neil
>
>


 
Richard,

I have a spare MAF, TPS and Stepper....what shows you going to?

--
Neil


 
In <2AfCc.648$3G5.6414425@news-text.cableinet.net> Richard wrote:
> Neil,
> I did wonder about the 'dodgy spider thingy' but then I thought why
> would it keep going if I managed to keep the revs up? BTW it does the
> same on LPG and petrol so I'm assuming its more of an electrical
> problem rather than fuel. Richard

If it does it on LPG as well then you can more or less rule out the
complete EFi system including the air flow meter and ECU.

Normally the only common components are the throttle position sensor (
throttle pot) and (possibly) the idle air control stepper motor. The TPS
could cause your problem if it was giving out erroneous readings in the
lower area - possibly causing the engine to over or under fuel and make
it difficult to start but I'd expect the ECU to work around that.

The ignition system would be my main suspect as it is independant of
both fuel systems and is capable of causing the problems you describe. A
good starting point would be plugs and leads. Plugs take a hammering on
LPG and it's a good idea to replace them every 12000 miles (I know some
people replace them every 6000). HT leads need to be in good condition,
especially for LPG. After that you are looking at possible distributor
cap/rotor arm problems, a faulty ignition amplifier or a worn
distributor. It's unlikely to be the coil if it runs OK at higher revs.

It is possible that the infamous spider could be the cause but IME this
tends to stop the engine dead at any speed rather than be rpm specific.
Easiest way to rule that out is to supply the ignition with it's own
feed.

HTH

cheers

Dave W.
http://www.yorkshireoffroadclub.net/
 
"Dave White" <davew_nospamhere@yorkshireoffroadclub.net> wrote in message
news:20040623171825455+0100@news.demon.co.uk...
> If it does it on LPG as well then you can more or less rule out the
> complete EFi system including the air flow meter and ECU.

Mine had exactly the same problem on both LPG and Unleaded, and that was the
air flow meter.

D


 
On Wed, 23 Jun 2004 13:23:01 +0000 (UTC), "Neil Brownlee"
<n.brownlee@pccontrolNOSPAMsystems.com> wrote:

> ISTR that Rogers of Bedford have a nice fix for
>this - that doesn;t involve buying the new stupid LR fob replacement at
>£300..!

If you need more info from Rogers, drop me a line on here.

I work for them, on the transport side, but we are all based in the
same place and I get staff discount. :)

--
ColonelTupperware
spouting bollocks on Usenet since 1997
Usenet FAQ at
http://www.its.caltech.edu/its/services/internetapps/news/news2.shtml
UPCE FAQ at http://upce.org.uk/
UKRM FAQ at http://www.ukrm.net/faq/
 
On Wed, 23 Jun 2004 14:44:06 +0000 (UTC), "Neil Brownlee"
<n.brownlee@pccontrolNOSPAMsystems.com> wrote:

>Richard,
>
>I have a spare MAF, TPS and Stepper....what shows you going to?

Neil,
Pretty please
I could do with borrowing these, I have a Disco V8 efi that is dead in
Normandy, and I'm going out this weekend to try to get it going.
I'm in Bedford.

--
ColonelTupperware
spouting bollocks on Usenet since 1997
Usenet FAQ at
http://www.its.caltech.edu/its/services/internetapps/news/news2.shtml
UPCE FAQ at http://upce.org.uk/
UKRM FAQ at http://www.ukrm.net/faq/
 
Neil,
We are going to the LRE show at Billing for three nights.
Richard


"Neil Brownlee" <n.brownlee@pccontrolNOSPAMsystems.com> wrote in message
news:cbc4vm$ad$1@hercules.btinternet.com...
> Richard,
>
> I have a spare MAF, TPS and Stepper....what shows you going to?
>
> --
> Neil
>
>


 
On Wed, 23 Jun 2004 13:28:30 GMT, "Richard"
<richardsemailNOSPAM@blueyonder.co.uk> wrote:

>Neil,
>I did wonder about the 'dodgy spider thingy' but then I thought why would it
>keep going if I managed to keep the revs up?
>BTW it does the same on LPG and petrol so I'm assuming its more of an
>electrical problem rather than fuel.
>Richard
>

I would check

i) vacuum - particularly the little vac pipe that runs from the plenum
to the distributor (mine split causing similar symptoms)

ii) ignition amplifier (mine packed up, causing similar symptoms)

iii) air flow meter (mine was found to be fine when I had similar
symptoms)

As you may have guessed, I had a very similar issue and found i) and
ii) to both be at fault. Luckily both are cheap to fix.


--

Tim Hobbs

'58 Series 2 88" aka "Stig"
'67 Series 2a 109" aka "Ernie (FOR SALE)
'77 101FC Ambulance aka "Burrt"
'95 Discovery V8i aka "The Disco" (FOR SALE)
03 Volvo V70

My Landies? http://www.seriesii.co.uk
Barcoding? http://www.bartec-systems.com
Tony Luckwill web archive at http://www.luckwill.com
 
On Wed, 23 Jun 2004 14:19:17 +0000 (UTC), "Neil Brownlee"
<n.brownlee@pccontrolNOSPAMsystems.com> wrote:

> DF> Of course, now somebody's going to point out that the 3.9 doesn't
> DF> *have* an air flow meter and I'll look a complete berk.
>
>It does have one ;-) And I rather luckily have a working spare here ... so
>Richard .. where are you based?

30 seconds with a testbook will tell you if is working or not....


--

Tim Hobbs

'58 Series 2 88" aka "Stig"
'67 Series 2a 109" aka "Ernie (FOR SALE)
'77 101FC Ambulance aka "Burrt"
'95 Discovery V8i aka "The Disco" (FOR SALE)
03 Volvo V70

My Landies? http://www.seriesii.co.uk
Barcoding? http://www.bartec-systems.com
Tony Luckwill web archive at http://www.luckwill.com
 
"Tim Hobbs" <tim@101ambulance-urine.net> wrote in message
news:c9ojd090n56117u2koeot2ijll72u0htr4@4ax.com...
> > DF> Of course, now somebody's going to point out that the 3.9 doesn't
> > DF> *have* an air flow meter and I'll look a complete berk.
> >
> >It does have one ;-) And I rather luckily have a working spare here ...
so
> >Richard .. where are you based?
>
> 30 seconds with a testbook will tell you if is working or not....

Not nececelery. Mine had an intermittent fault, so it would check out fine
most of the time. Only sussed it when it *happened* to play up just as I
pulled out of the workshop at James French. 5 minutes earlier it'd been
working flawlessly.

Which is why I thought swapping with a mate'd be a good idea - if his
started playing up and Richard's didn't, it would be a bit of a clue.

David


 
Its definately an intermittant fault. It happened last summer and had been
fine until yesterday. Drove into town and it would stop everytime for about
6 miles. After getting back in after shopping it was fine all the way home.
If it did it all the time I would get it checked but I dont fancy paying
£xxx amount for them to say they cant find anything wrong.


"David French" <david.not.spam.french@virgin.net> wrote in message
news:40d9edfb$0$4576$db0fefd9@news.zen.co.uk...
> "Tim Hobbs" <tim@101ambulance-urine.net> wrote in message
> news:c9ojd090n56117u2koeot2ijll72u0htr4@4ax.com...
> > > DF> Of course, now somebody's going to point out that the 3.9 doesn't
> > > DF> *have* an air flow meter and I'll look a complete berk.
> > >
> > >It does have one ;-) And I rather luckily have a working spare here ...
> so
> > >Richard .. where are you based?
> >
> > 30 seconds with a testbook will tell you if is working or not....
>
> Not nececelery. Mine had an intermittent fault, so it would check out
fine
> most of the time. Only sussed it when it *happened* to play up just as I
> pulled out of the workshop at James French. 5 minutes earlier it'd been
> working flawlessly.
>
> Which is why I thought swapping with a mate'd be a good idea - if his
> started playing up and Richard's didn't, it would be a bit of a clue.
>
> David
>
>


 
Hello, Colonel!

EEEEK! *NOW* I find out ;-)

Oh well....you will no doubt have seen Piglet there on a few occassions?!
Sticker covered 4 tailpiped V8 Disco caged thingy!

P19 MUD ;-)

--
Neil


 
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