So - if my Lucas equipped 88 V12 RHD Conv does not use a crankshaft sensor like on Marelli cars (see response below)- what is it that supplies the necessary engine speed info etc to the ECU in order to optimise engine performance under varied conditions ? or in other words - where else could I expect to need to check if that component (s) (whatever or wherever it is ) starts to play up or goes wrong ?
Not being pessimistic at all (Prince of Darkness notwithstanding) - just curious to understand… you see, I just nursed home my wife’s Freelander with - guess what- a faulty crank sensor …
Roy
Subject: Re: [xj-s] How to locate /check Crank Sensor on 88 V-12?
To: xj-s@jag-lovers.org
Scratch the crank sensor off your
worry list. Since your is a Lucas ignition, you don’t have
one
Engine speed signal comes from the ignition system…the amplifier,
specifically.
What provides optimized performance? It’s more than just engine speed. In a
very brief nutshell…
Mixture control and fuel delivery to the cylinders, in the form of varying
injector pulse width, comes primarily from the throttle position sensor and
the baro sensor. Oxygen sensors and an air temp sensor are mixture trimming
devices. Two switches, one electric and one vacuum-electric, provide full
load enrichment. A coolant temp sensor controls cold running enrichment.
Does that help? For more detail you can visit the AJ6 Engineering page where
you’ll find some very good write-ups of how it all works.
Where you’d look if a problem occurs depends on the nature of the problem.
For example, the engine speed signal would be one place to start looking if
you have no injector activity at all. This would be a “will not run” issue
and not a “optimized performance” issue.
Cheers
Doug Dwyer
Longview Washington USA
1995 XJR
So - if my Lucas equipped 88 V12 RHD Conv does not use a crankshaft sensor
like on Marelli cars (see response below)- what is it that supplies the
necessary engine speed info etc to the ECU in order to optimise engine
performance under varied conditions ? or in other words - where else could I
expect to need to check if that component (s) (whatever or wherever it is )
starts to play up or goes wrong ?
Not being pessimistic at all (Prince of Darkness notwithstanding) - just
curious to understand… you see, I just nursed home my wife’s Freelander
with - guess what- a faulty crank sensor …
// please trim quoted text to context onlyFrom: “Roy Barnes” royabarnes@yahoo.com
