I have a '95 xj12 6.0 and it has been idling rough lately. Whan the
car is hot and the AC is on, it vibrates a lot and shakes the car.
Well, I noticed that the idle stops on the throttle bodies looked
out of adjustment, so I found some instructions on the AJ6
engineering web site for adjusting the throttle linkage. I think I
got the idle stops adjusted right now and the car performs much
The good news is the idle is smooth now - very little vibration or
shaking. The bad news, though, is that the idle speed is faster
than I would expect. The tach reads about 900 - 920 when the engine
is hot, it’s in drive, and the AC is on full. It probably idles
about 1200 in neutral with the AC on, and maybe 1400 in neutral
with the AC off.
That’s a bit fast, isn’t it? If so, any suggestions how to bring it
BTW, I tried to measure the voltage on the throttle potentiometer
as described on the AJ6 web site, but was not able to get a
reading. I see a green/yellow wire near the potentiometers, but
can’t seem to get a reading from the connector - should I pierce
the insulation to get a reading? I’m assuming the ignition switch
should be set one position shy of engaging the starter motor when
taking this measurement. The reading would be from that wire to
chassis ground, right?
Thanks for any suggestions you have for a newbie at this sort of
Falls Church, VA, United States
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