[v12-engine] 2500 RPM idle at startup

Hello,
I have an '85 XJS HE that was idling rough at about 500 rpm in
park. As per the book’s instructions, I cleaned the throttle
bodies and adjusted the linkages. I also disassembled, cleaned and
adjusted the throttle position pot at the same time. Now the idle
stays at 2500 RPM. There is almost no suction when I put my hand
over the air inlet on the B side. I triple-checked for any vacuum
leaks or disconnected wires. I know if the butterfly plates aren’t
centered exactly right in the throttle bodies that can account for
a high idle but as high as 2500 RPM? What else could account for
this?–
JulianLongo
Hermitage, PA, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

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Julian,

Possibly the AAV is sticky. Try spraying some carb or throttle
body cleaner into the tube where it draws air from the left
air cleaner housing. Also, there are some test procedures in
The Book, I believe.

Ed Sowell
76 XJ-S

Hello,
I have an '85 XJS HE that was idling rough at about 500 rpm in
park. As per the book’s instructions, I cleaned the throttle
bodies and adjusted the linkages. I also disassembled, cleaned and
adjusted the throttle position pot at the same time. Now the idle
stays at 2500 RPM. There is almost no suction when I put my hand
over the air inlet on the B side. I triple-checked for any vacuum
leaks or disconnected wires. I know if the butterfly plates aren’t
centered exactly right in the throttle bodies that can account for
a high idle but as high as 2500 RPM? What else could account for
this?


JulianLongo

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !