Strange Problem...

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...??

Reply to
Ian
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On or around 29 Mar 2006 04:24:17 -0800, "Ian" enlightened us thusly:

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.

Reply to
Austin Shackles

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

Reply to
Joskin

On or around Wed, 29 Mar 2006 14:05:25 +0100, "Joskin" enlightened us thusly:

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.

Reply to
Austin Shackles

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???

Reply to
Ian

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.

Reply to
Hirsty's

On or around 29 Mar 2006 05:36:28 -0800, "Ian" enlightened us thusly:

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.

Reply to
Austin Shackles

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)

Reply to
QD Steve

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....

Reply to
Ian

On or around Wed, 29 Mar 2006 23:43:24 GMT, "QD Steve" enlightened us thusly:

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.

Reply to
Austin Shackles

Reply to
Anthony

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

Reply to
jason-h

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