RRC Running slightly rough plus very hot exhaust pipe

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Martin Coombs - 09 Oct 2004 22:21 GMT

I was driving my 1986 Range Rover classic 3.5EFI the other night on a 15
mile journey, about half way it seemed to be losing a bit of power and
started to misfire a bit. This got worse as the journey continued until
eventually it was running on what seemed like 2 cylinders. Managed to get it
to my parents house and leave it there.
Went back today, checked and pushed all ignition leads, oil was ok, water
was clear so no gasket leak. Started it up, ran sweet as a nut. Went for a
drive and noticed on initial acceleration would run ok, then hold back and
then go again. As time went on the tickover got a little lumpy.
Checked exhaust for emmissions, but seemed clean, but I did notice the
exhaust gas was very very hot and would give you a nasty burn if you left
your hand there. The tail pipe was extremely hot and dropping water on it it
fizzled and evaporated away! I don't ever remember any other car being this
hot.
Could this be an ignition timing issue, or has anyone got any suggestions?

TIA

Martin Coombs

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PDannyD - 09 Oct 2004 23:04 GMT

> I was driving my 1986 Range Rover classic 3.5EFI the other night on a
> 15 mile journey, about half way it seemed to be losing a bit of power
[quoted text clipped - 6 lines]
> then hold back and then go again. As time went on the tickover got a
> little lumpy.

Check the coil when the misfiring occurs. Is it hot or merely warm?
If it's hot then the coil's dead.

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Richard - 09 Oct 2004 23:07 GMT

could be ignition if its too far out, the distributor hasnt moved has it?
also, very hot exhaust could indicate a weak mixture, i had it on a V8 90
where the manifolds were glowing bight red. maybe a fuel blockage?
Richard

> I was driving my 1986 Range Rover classic 3.5EFI the other night on a 15
> mile journey, about half way it seemed to be losing a bit of power and
[quoted text clipped - 15 lines]
>
> Martin Coombs

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Martin Coombs - 12 Oct 2004 09:40 GMT

Hi Richard

Spoke to someone the other day who also suggested weak mixture/timing, so
have booked the Rangie in next weak to be put on computer and checked out.
Fingers crossed it will not be too expensive.

Martin

> could be ignition if its too far out, the distributor hasnt moved has it?
> also, very hot exhaust could indicate a weak mixture, i had it on a V8 90
[quoted text clipped - 23 lines]
> >
> > Martin Coombs

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PeterMcC - 12 Oct 2004 12:05 GMT

Martin Coombs wrote in
<ckg59k$dcl$1@sparta.btinternet.com>

> Hi Richard
>
> Spoke to someone the other day who also suggested weak
> mixture/timing, so have booked the Rangie in next weak to be put on
> computer and checked out. Fingers crossed it will not be too
> expensive.

You may have elimiateed it already but it is possible to get similar
symptoms from a weak/broken exhaust valve spring. The valve dosn't close
properly so that cylinder loses compression - hence the slightly rough - and
combustion occurs in the manifold - hence very hot exhaust pipe.

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