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Bernie,
I got a rebuilt one from Brett Instruments several years ago. Works fine. A
little over $100 as I recall. They have since been bought out by www.FuelInjectionCorporation.com, but the original owner was still doing his
thing at his rebuilding shop near me when I bought a couple injectors from
him within the last year. Contact info is at my Website.
Engine warm, pulse width at the injectors is 2.5, which is where it
should be.
My manifold pressure sensor which varies the pulse width based on
engine vacuum, is testing out of spec.
Does anyone know of a replacement or refurbished unit?
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At the back of the sensor is an adjustment screw.
For the next few days I am in a place where I cannot go and look at the old sensor taken off the coupe.
I think you have to take off a plastic cover to get to the screw, which has an allen head recess.
Cannot recall which way you turn it, but it varies the output of the unit.
I am not sure if it varies the starting point only or if it stiffens the whole diaphragm to modify the fuelling.
My guess is that fixes your problem if you know how to calibrate it. Or you can drive around and fiddle with the screw to see if it brings fuelling back to spec.
I was told years ago Volvo used the same sensor at one time, but perhaps not with the same calibration.
At the back of the sensor is an adjustment screw.
For the next few days I am in a place where I cannot go and look at the old sensor taken off
the coupe.
I think you have to take off a plastic cover to get to the screw, which has an allen head
recess.
Cannot recall which way you turn it, but it varies the output of the unit.
I am not sure if it varies the starting point only or if it stiffens the whole diaphragm to
modify the fuelling.
My guess is that fixes your problem if you know how to calibrate it. Or you can drive
around and fiddle with the screw to see if it brings fuelling back to spec.
I was told years ago Volvo used the same sensor at one time, but perhaps not with the same
calibration.
Richard Dowling, Xiamen, PRC, 11 July------------------------------------------------------------------------------
My 1978 XJS has been running rich for some time.
Finally decided to do some diagnosis.
Engine warm, pulse width at the injectors is 2.5, which is where it
should be.
My manifold pressure sensor which varies the pulse width based on
engine vacuum, is testing out of spec.
At the back of the sensor is an adjustment screw.
For the next few days I am in a place where I cannot go and look at
the old sensor taken off
the coupe.
My guess is that fixes your problem if you know how to calibrate
it. Or you can drive
around and fiddle with the screw to see if it brings fuelling back
to spec.
Richard Dowling, Xiamen, PRC, 11 July
The screw will move the bellows in and out and vary the injector
pulse width.
My problem is that I cannot get it within specs. It’s supposed to
have specific readings with and without vacuum attached.