RR 1990, engine miss

I have a 1990 RR with 3.9 EFI petrol.
Every now and then at full throttle when going up a incline or overtaking
the engine will suddenly cut out completely. It is not a 'miss' on a few
cylinders, it is a total no power.
This is a momentarily, because as soon as you lift off the throttle all is
well.
It would appear not to happen at 95% throttle or less.
I have changed the 'throttle potentiometer' admittedly it was 2nd hand, but
the problem is still there.
Curiously, my neighbour has the same problem on his 1991 RR.
Whats happening?
Thankyou for those who can answer or comment. John

Milcom Instrumentation <[email protected]> uttered summat worrerz
funny about:
> I have a 1990 RR with 3.9 EFI petrol.
> Every now and then at full throttle when going up a incline or
> overtaking the engine will suddenly cut out completely. It is not a
> 'miss' on a few cylinders, it is a total no power.
> This is a momentarily, because as soon as you lift off the throttle
> all is well.
> It would appear not to happen at 95% throttle or less.
> I have changed the 'throttle potentiometer' admittedly it was 2nd
> hand, but the problem is still there.
> Curiously, my neighbour has the same problem on his 1991 RR.
> Whats happening?
> Thankyou for those who can answer or comment. John

Check the wires to the coil. Had similar on a 1983 V8.. Connection was poor
and so broke under certaincircumstances.

Lee

"Lee_D" <[email protected]> wrote in message
news:[email protected]...
> Milcom Instrumentation <[email protected]> uttered summat worrerz
> funny about:
>> I have a 1990 RR with 3.9 EFI petrol.
>> Every now and then at full throttle when going up a incline or
>> overtaking the engine will suddenly cut out completely. It is not a
>> 'miss' on a few cylinders, it is a total no power.
>> This is a momentarily, because as soon as you lift off the throttle
>> all is well.
>> It would appear not to happen at 95% throttle or less.
>> I have changed the 'throttle potentiometer' admittedly it was 2nd
>> hand, but the problem is still there.
>> Curiously, my neighbour has the same problem on his 1991 RR.
>> Whats happening?
>> Thankyou for those who can answer or comment. John
>
> Check the wires to the coil. Had similar on a 1983 V8.. Connection was
> poor and so broke under certaincircumstances.
>
> Lee
and the plugs to the temperature sensors new plugs are cheap.
Derek
Rangies are too big too push

Also....check fuel filter is not clogged.

--
Neil

Mine is a 1990 3.9EFI auto and does exactly the same!!
Back off slightly and it restarts, hair raising when joining motorways.
It is not a misfire, cuts out completely.
However, if I stomp it right to the floor hard, it will pull all the way to
the rev limit!

Martin

"Milcom Instrumentation" <[email protected]> wrote in message
news:[email protected]...
>I have a 1990 RR with 3.9 EFI petrol.
> Every now and then at full throttle when going up a incline or overtaking
> the engine will suddenly cut out completely. It is not a 'miss' on a few
> cylinders, it is a total no power.
> This is a momentarily, because as soon as you lift off the throttle all is
> well.
> It would appear not to happen at 95% throttle or less.
> I have changed the 'throttle potentiometer' admittedly it was 2nd hand,
> but the problem is still there.
> Curiously, my neighbour has the same problem on his 1991 RR.
> Whats happening?
> Thankyou for those who can answer or comment. John
>
>