[xj] 1985 XJ6 some symptoms hopeing for some cures

Hello
Well we got the car home thursday night and I got around to looking
at it today. The engine internally is very clean, all the various
sensors look to be original, the AFM looks original all the hoses
look original so I know that I have a bunch of things to keep me
busy for a while. Anyway, the symptoms that The car is having are
first, the idle was steady at 1200 RPM and there is a intermitten
backfire only at idle. This leads me to believe that it has a lean
misfire. As per archive research, I put a clamp on the auxillary
air valve hose to see if it had any effect on idle and it did not.
Previous owner had the air cleaner loose and someone had taken the
plumbing apart from the AFM to the throttle body and one of the
rubber boots was not clamped properly down at the throttle boby
elbow. I pulled out the idle adjustment screw cleaned it put it
back in and set it at one and one half turns out. reinstalled
everything started it and the idle was down to @ 800 RPM and the
back fire was gone, for a little while anyway. Took it out for a
drive. The misfire comes and goes and the idle will sometimes be
good and other times it will creep up to @ 1000 and the misfire
comes back.The misfire comes and goes with the idle fluctuations.
Thanks in advance for any help you can give.
Thanks, Dan–
Amthatiam
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

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Sounds like a good start Dan. Get under the engine and look up with a
flashlight on the 1" hose that comes out the back of the AAV nad be sure it’s
not cracked & leaking. If it looks suspicious, you’ll have to remove the AAV
to get at the hose’s connection to it.

Also check the vacuum hoses and the valve under the air cleaner to the
canister. You can check all the connections against the diagrams…

Vacuum diagram at: www.jag-lovers.org/snaps/snap_view.php3?id=1169660668
FAQ at: http://www.jag-lovers.org/xjlovers/faqsandinfo.html
Purge & Vacuum parts pics at: http://www.jag-lovers.org/v.htm?1169948310
Purge & Airpump diagram at: http://www.jag-lovers.org/v.htm?1170008815

Note that the 2nd pic above has the hose returning to the electric purge valve
unlabelled – it’s the lower one.–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

Amthatiam wrote:

Hello
Well we got the car home thursday night and I got around to looking
at it today. The engine internally is very clean, all the various
sensors look to be original, the AFM looks original all the hoses
look original so I know that I have a bunch of things to keep me
busy for a while. Anyway, the symptoms that The car is having are
first, the idle was steady at 1200 RPM and there is a intermitten
backfire only at idle. This leads me to believe that it has a lean
misfire. As per archive research, I put a clamp on the auxillary
air valve hose to see if it had any effect on idle and it did not.
Previous owner had the air cleaner loose and someone had taken the
plumbing apart from the AFM to the throttle body and one of the
rubber boots was not clamped properly down at the throttle boby
elbow. I pulled out the idle adjustment screw cleaned it put it
back in and set it at one and one half turns out. reinstalled
everything started it and the idle was down to @ 800 RPM and the
back fire was gone, for a little while anyway. Took it out for a
drive. The misfire comes and goes and the idle will sometimes be
good and other times it will creep up to @ 1000 and the misfire
comes back.The misfire comes and goes with the idle fluctuations.
Thanks in advance for any help you can give.
Thanks, Dan

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: http://www.jag-lovers.org/lists/search.html

To remove yourself from this list, go to http://www.jag-lovers.org/cgi-bin/majordomo.

// please trim quoted text to context only