[xj] idle slowing and oil light coming on when idling

Trying to figure out today why the idle is getting slow and the oil light
comes on when car in idle/park/stop signs etc

i know I have a recent oil leak at front center of engine but it is not
losing enough that I even need to add right away.

i have not gotten around to changing hoses yet. maybe a vacuum issue?

Dietrich–
86 XJ6 Black :needs some TLC!
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In reply to a message from dietrich sent Tue 3 Jul 2007:

in over my head(nothing new as other forum members know!) now…

changed the breather elbow which was full of thick yellowish stuff as
well…oil looks ok on dip stick and thru cam cover though.
i thought this would mean blown head gasket but not sure.

car then started to idle so slow and almost stall unless I gave her some
gas.

i am thinking problems coming out as I was finally driving the car
regularly after it sitting much of my 9 months of ownership. been
getting decent in town rides the past week.

idle was just over 8000 rpm and steady up until this afternoon after
some errands.–
86 XJ6 Black :needs some TLC!
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In reply to a message from dietrich sent Tue 3 Jul 2007:

Dietrich:

Are you loosing coolant? Compression test? Any spark plugs that
look cleaner than the others? Bubbles in the coolant in the surge
tank? The yellow stuff could well be just an emulsion of water
vapor condensation and oil as a result of short trip driving in
cold weather.

Leaky vacuum lines usually cause a fast idle, not a slow idle.
The oil light coming on at a slow idle may well be quite normal.
Is the oil thin?

More by better Jaguar engine genius’s than I. I do not claim to be
one.

Is the air cleaner element clean or dirty causing a rich and slow
loppy idle? I am sure you meant 800 rpm! What is it now?

Enjoy your 4th!!

Carl–
The original message included these comments:

in over my head(nothing new as other forum members know!) now…
changed the breather elbow which was full of thick yellowish stuff as
well…oil looks ok on dip stick and thru cam cover though.
I thought this would mean blown head gasket but not sure.
car then started to idle so slow and almost stall unless I gave her some
gas.


Carl Hutchins
Walnut Creek, California, United States
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In reply to a message from cadjag sent Wed 4 Jul 2007:

HI D,

I wouldn’t jump too quickly into a new engine. You could have some
yellowish stuff from condensation or whatever.
If you haven’t done it in a while, change the oil and filter and
catch the oil. Then you can see what’s going on with it.

Head gaskets also lead to overheating, and if you are driving it
around and no overheating issues, I wouldn’t be too concerned with
it.
You can always do, or have done, a compression test. I bought the
kit from Auto Zone for less than $40. I check all my cars now
before I start breaking them, just to get an idea of the conditon
of the motor.

Irratic idle could be leaking air somewhere, fuel starvation from a
bad (dirty) filter, bad coolant temperature sensor, or a whole host
of other things.
Check the boot behind the Air Flow Meter to make sure it is in good
shape, and the hose going into the Extra Air Valve. The hose on the
back side of the AAV is also suspect, but harder to check.
If it evened out to 800 after warming up, sounds like you are OK.

I’d just take a compression test, and a good look over the motor
for anything that looks worn or damaged.

Good luck with it
David Boger–
69 XJ6, 75 XJ12, 84 XJ6, Bunches of parts cars
Rockwell, NC, United States
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changed the breather elbow which was full of thick yellowish stuff as
well…oil looks ok on dip stick and thru cam cover though.
i thought this would mean blown head gasket but not sure.

No, not necessarily. That area of the engine stay relatively cool so the
normal condensation doesn’t burn off. When mixed with oil it gets all gooey.
Clean the breather system on general principle, though. Its probably over
due.

car then started to idle so slow and almost stall unless I gave her some
gas.

A number of possibilities but make sure the throttle bore is clean and the
throttle blade has the proper .002" clearance

Cheers

Doug Dwyer
Longview Washington USA
1995 XJRFrom: “dietrich” dietrich@hidden-agenda.com

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In reply to a message from Doug Dwyer sent Wed 4 Jul 2007:

thanks for the tips guys. I have a list ready to go through. as well as
some from a topic I found from searching

the shift select is still not fixed either and was acting up yesterday.
wonder if this did anything to bring upon this new issue–
86 XJ6 Black :needs some TLC!
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In reply to a message from dietrich sent Wed 4 Jul 2007:

of course just went out to work on the car…started right up then idle
fell slowly and stalled. same again. pushed in fuel tank switch when
starting and she starts right up. right tank is shutoff and empty so
maybe somehow was trying to use that tank…odd

some new oil coming from back of head not good news for me either–
86 XJ6 Black :needs some TLC!
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In reply to a message from DavidBoger sent Wed 4 Jul 2007:

Hi,
I had the oil light problem on my 4.2 XJ too at idle. My car was
suffering horridly low oil pressure but was not making horrid
noises. What I did was rip off the oil filter head,and the oil
relief valve. The valve was removed from the filter head and
replaced with new components. The most important thing was the
relief valve '‘o’'ring which stops bypass past the valve body. This
means the filter will filter properly and cause a rise in pressure.
The car was filled with Penrite HPR50 oil and this gave me a much
improved oil pressure and the elimination of the light coming on!
My car uses a direct feed oil pressure gauge in lieu of the
original electric unit so the pressure is quite accurate being now
at a healthy 30-40psi.
Good Luck, Richard–
The original message included these comments:

In reply to a message from cadjag sent Wed 4 Jul 2007:


6AG146
Perth,Western Australia, Australia
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In reply to a message from redjagman sent Fri 6 Jul 2007:

thanks for the tip richard. will investigate same areas tomorrow

Dietrich–
The original message included these comments:

Hi,
I had the oil light problem on my 4.2 XJ too at idle. My car was
suffering horridly low oil pressure but was not making horrid
noises. What I did was rip off the oil filter head,and the oil
relief valve. The valve was removed from the filter head and
replaced with new components. The most important thing was the
relief valve '‘o’'ring which stops bypass past the valve body. This
means the filter will filter properly and cause a rise in pressure.
The car was filled with Penrite HPR50 oil and this gave me a much
improved oil pressure and the elimination of the light coming on!
My car uses a direct feed oil pressure gauge in lieu of the


86 XJ6 Black :needs some TLC!
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

===================================================
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