In reply to a message from cadjag sent Wed 4 Jul 2007:
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
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
69 XJ6, 75 XJ12, 84 XJ6, Bunches of parts cars
Rockwell, NC, United States
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