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[REvil71]

I have a 99 pre-face lift elite 2.5 petrol and she is driving me up the wall.
Start her from cold, lovely idles perfect, drive for more than a few yards or let her idle for a little then the miss happens. Sounds like a cylinder has dropped. This has happened out of the blue. Changed leads but no difference. Anyone got any ideas.
Thanks

[TheBoy]

Is the miss only at idle? If so, look for unmetered air getting in.

[REvil71]

From cold idling and a little driving - fine . Once it even thinks about getting warm the fault occurs. Idlies rough and driving feels like a large hesitation as if 1 or more plugs are undone.

[TheBoy]

From cold idling and a little driving - fine . Once it even thinks about getting warm the fault occurs. Idlies rough and driving feels like a large hesitation as if 1 or more plugs are undone.

Could be coolant temp sensor, would need a live data feed to know for def

[REvil71]

I've just noticed the heater bypass valve isnt plugged into anything. should it be if so what

[ians]

'isn't plugged in'

- there should be three coolant hoses and a vacuum pipe on top.

But shouldn't affect idling.

Something tells me you're not really talking about the HBV though...

[bigdods]

Both my old 2.5 and my newer 3.0 suffered odd idling problems and missing/loss of power. In both cases a replacement dis pack was needed.

[REvil71]

Is there any test I can do before I replace the dis just incase it isn't that. Also I was talking about the HBV , the water connections are fine but there is no vacuum line connected.

[ians]

The HBV shouldn't affect idling, but I'm not sure if the vac leak from the disconnected hose might have any consequences..?  

AFAIK the vac pipe should go through the bulkhead somewhere in the vicinity of the coolant hoses.   May well have broken off at the bulkhead?

Anyway I would try removing the idle control valve and giving it a good clean to start with - can't do any harm.

[Marks DTM Calib]

Any ECU light or fault odes stored.....it is classic over fueling when hot type symptoms which tends towards coolant temp sensor.

[REvil71]

Is there a link for the coolant temp sender or pics.
cheers