As I recall mine idled at about 15-17" vacuum.

The fuel interface unit translates injector pulse width into some sort of language that the trip computer can use to calculate fuel economy. I don't think it has anything to do with your problem...but then again I don't know exactly how it works, so.....


Cheers
DD

 

Just before it died, we could make the engine produce 17 at idle as long as we had a vac pump on the computer at 20-22. So a bad ECU isn't such a bad thought eh?

I don't have a trip computer, so I guess I don't have a fuel interface unit to worry about. Thanks!

 

I have another question, can an ECU from an XJ6 be used on a V12 XJS? I'm thinking probably not, but I gotta ask...

 

Nope ! :-)


Cheers
DD

 

oh well, was worth a shot.