hey not me the 97 we just received… it revs @ 1500 …
possibly the throttle valve, it is at my sons place right
now…possibly just needs the gap closing to 2 thou…???Thanks
Doug…–
Pacific Jaguar Enthusiasts Group 44, Canada.
Pitt Meadows, BC, Canada
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In reply to a message from Jagart sent Tue 15 Jan 2013:
97 what? It was changeover year.
High idle - how come Gary gets into every thread?–
1E75339 66 D, 1R9720 69OTS, 1960 MkIX, 1R27190 70 FHC
Gaithersburg, Maryland, United States
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In reply to a message from PeterCrespin sent Wed 16 Jan 2013:
it is an XJ6 4.0 Litre’’'sorry…–
Pacific Jaguar Enthusiasts Group 44, Canada.
Pitt Meadows, BC, Canada
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In reply to a message from Jagart sent Thu 17 Jan 2013:
So how did setting the gap come out?
I learned (painfully) about high idle several years ago. The
simplest fix can just be getting the throttle plate to close all
the way. There was apparently a bulletin for changing the spring,
so this can be the issue. Not so in my case.
The second issue can be improper operation of the Idle stepper
valve. I fooled with that for months, and after I let the reset
function eject the pintle (I was not alone, see archives), I got a
new valve. Still no joy.
Throw in a few TB cleanings, a TPS contact cleaning or two and test
after test for smooth TPS operation, and I was pretty frustrated.
Then, I did a TPS calibration and suddenly all was well. What I
have learned since is that the ECU, which controls the idle speed
via the idle stepper valve, can’t / won’t attempt to control unless
it senses the TPS is at, well, IDLE! That is a very sensitive
detection and requires the TPS to be very close to the proper,
calibrated, closed throttle position.
Now, as to how much play is in the TPS mounting, why my TPS became
miscalibrated after 14 years, or any other question about why the
calibration was needed, I do not know. But I do know that the
recalibration fixed the idle control.
Good luck.–
Ross - 89 XJS, 98 XJR, 99 XJR, 02 XJ8
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