95 Discovery One not starting

[keensg]

All of a sudden my Disco started running rough, as if not firing on all cylinders. It then stalled when I dipped the clutch. After some trying it did start again and ran fine (and smooth) if I kept the revs over 3K. It ran rough when the revs dropped. As I drove it into the driveway, it stalled and now won't start. I have replaced the plugs, cap and rotor and plug wires - but no luck, it won't start again.

Car has 150K on it but has run like a champion until now. Other than kick the tyres or hit something with a hammer, I am out of ideas. Thanks for any help.

My second question, is at what point does the economics of keeping this car going prove to be unrealistic?

[J!m]

Taking a wild guess here, as I am not familiar with that particular engine...

Try disconnecting the MAP (Manifold Absolute Pressure) sensor, and see if it runs the same. If so, it's likely the culprit.

When these go bad (or get intermittent) the engine can run at high RPM but will not run well (if at all) at idle and be very difficult to start once it stalls.

A leaking vacuum hose can cause the same symptoms (and not throw a fault light; you did not mention a 'check engine' light) as the MAP sensor will not get a proper reading. Spray the vacuum hoses and connections with WD-40 and note any change in idle speed. If these hoses have been cooking under the hood for 150K miles, they are likely cracked and rotten. The connections are likely not very tight any longer either. Every hose under the hood is going to die around the same time. If you radiator and/or heater hoses are changed, the vacuum hoses should be changed as well (same with the belts). Very often this is not done, and poor idle (at least) is the result.

No guarantees, but if it was my truck, this is where I'd start looking...

[singingcamel]

WHAT YEAR !!!! need to know what year!

[Les Parker]

Hello there,

I note from the original post that this is a '95 Discovery.
Is the dash "battery" light on? Were the headlamps "pulsing" before the engine "died".
My thought is a bad alternator, which is the end result of my own vehicle having similar issues.
Just my thoughts, please advise

[singingcamel]

a number of things can cause a no start. as Les had mentioned could be your alt, could be your amp module on the dizzy(weak spark to the plugs),good spark to the plugs?
should have a good strong spark from the coil as well. hows your battery?fuel pump running?plugs wet. last tune up?

[qmueller]

Did you ever figure anything out? I have a 3.9 liter, 95, there's many things to check from no start. First is spark, then are you getting fuel and at proper pressure?