V8 Troubles

Can anyone help?
My 1990 110 V8 runs fine when cold, but after 3 or 4 miles it starts
backfiring & cuts out. It'll usually fire up straight away & maybe run for a
few seconds or maybe cut out straight away. I've had it running while
stationary for half an hour & nothing happens. I've replaced the coil &
crawled all over the h.t. cables & dizzy. Is it possible to check the
electronic ignition module/amplifier easily? Is this a fuel pump problem?
Any suggestions would be gratefully appreciated while I've still got hair!

Kevin.

--

hi kevin

firstly make sure oil pressure/pump is ok , if the oil pressure drops
very low the hydraulic valve lifters wont open the valves and you wont
get the inlet valves open in order to draw fuel in and exhaust out ..
i have had this problem once and it happens after the engine warms up,
but will do it every time you drive it , to fix it either get the oil
filter housing lapped again so its flat, or buy a pump booster plate
kit which is a sandwich plate that goes in between the pump body and
filter housing .

im not saying it is this but the oil pressure really needs checking
just in case , it should be higher than 20psi at all times , if it
drops lower you will start to see the engine popping and banging until
eventually it will stop running, then 30mins later it may start again
and run for a few mins .

"Kevin W" <[email protected]> wrote in message
news:[email protected]...
> Can anyone help?
> My 1990 110 V8 runs fine when cold, but after 3 or 4 miles it starts
> backfiring & cuts out. It'll usually fire up straight away & maybe run for
a
> few seconds or maybe cut out straight away. I've had it running while
> stationary for half an hour & nothing happens. I've replaced the coil &
> crawled all over the h.t. cables & dizzy. Is it possible to check the
> electronic ignition module/amplifier easily? Is this a fuel pump problem?
> Any suggestions would be gratefully appreciated while I've still got hair!
>
> Kevin.
>
Hi Kevin

I had the amplifier die on my 1989 Range Rover - I no longer have the car or
the Haynes manual but there is a procedure in the Haynes manual which tells
you how to check the amplifier (yes, really something in BoL that is
actually useful).

However they either seem to work or they don't - and if they don't it does
not start!

Graeme