I posted this before, but need some more responses. THis car was
pulled down for a head job about 15 months ago & has been driven
about 1100 miles & the idle is now higher. The idle was high when
it came back. Never had been high before. This bunch kept it a yr.
I do not want to take it back if poissible.Lowest it ides in drive
is 1000 to 1200 RPMS. It is 1500 to 1800 in park. I pulled AAV
Valve. I cleaned it & boiled it on stove. The piston goes all the
way down, except for just a hair when cold. When hot it goes up &
leaves a small gap where the housing starts narrowing. I assume it
should not close all the way. No change when reinstalled. I have
clamped vacuum lines & checked all the hose I can see on top. Are
there other hoses underneath the air filter housings that need to
be checked by removing the covers & air filters? I have not checked
for a manifold leak. Do I do this by spraying WD-40 along the edges
of the manifold in the center of the engine?
1.Am I checking the AAV Valve correctly?
2.How did you solve your high idle problems?
3. I know there is a vacuum leak when I step down on the gas, as
the air stops blowing out the A/C vents. Let off & it comes back.
Can this be a related problem & where do I look to solve this?
4.Can this vacuum leak, if it is at MANIFOLD CAUSE ANOTHER VALVE
SEAT TO DROP?
5.I need any advice here I can get & appreciate youir responses.I
try to send money to support the Board & need as much help as I can
get.
I know I am a pain, but I really need help here.
Thanks in advance. Ron–
Ron
Commerce,GA., United States
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In reply to a message from Ron Hanley sent Thu 24 Mar 2011:
Just a shot in the dark, but when I put mine back together I forgot
to put the gaskets between the throttle bodies and the intake
manifolds. You might be able to pinpoint the leak by putting the
end of a piece of hose to your ear and running the other end around
the intake path and any vacuum related hoses and accessories. Or
just start plugging ports with caps and see if you can find it, and
I’ve heard of using a propane torch, not lit of course, turned down
to a low flow and running it around the engine until rpm
increases. Haven’t done the propane thing before, usually just get
down close to engine and listen for leaks.–
Ron R. 1979 XJ6 Series II, 1989 XJS Conv (Marelli)
Scapppoose, OR, United States
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It sounds as if there are NUMEROUS areas you haven’t as yet checked for loose/broken vacuum lines. Indeed you do need to pull your air cleaner housings in order to see all the numerous vac outlets on the bottom of the intake manifolds. Once all those are properly reconnected, be sure to check the vac line that attaches to the bottom of your cruise control bellows.
In reply to a message from Earl Kiker sent Thu 24 Mar 2011:
There is a large one under the A bank T body (right side from
drivers seat)to feed the A/C idle up solenoid>
Nick–
Nick Morland 86XJ-S 88XJS6.0L5spd 73xj6 91VdP 97XK8cvt
Scotts Valley Ca, United States
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In reply to a message from konrads sent Thu 24 Mar 2011:
check the throttle bodies. The linkage was disturbed with
the head gasket, and may not have been set properly. If the
clearance is greater than the recommended .002 on each
side…you will never have proper idle. Kirby’s book has a
good write up on the method.–
1990 XJ-S V12 5.3 Coupe, Marelli
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In reply to a message from Ron Hanley sent Thu 24 Mar 2011:
Did you change the AAV at some point? I understand they have
different part numbers.I don’t know the difference. I know they
work like a thermostat (ie: 180 vs 195)
I wrote this same reply in the thread ‘‘Junkyards Finds’’ down
this page if you want too read it.
Larry
91 XJ-S 12cyl 5sp
95 VDP 6cyl–
The original message included these comments:
Valve. I cleaned it & boiled it on stove. The piston goes all the
way down, except for just a hair when cold. When hot it goes up &
leaves a small gap where the housing starts narrowing. I assume it
should not close all the way. No change when reinstalled. I have
1.Am I checking the AAV Valve correctly?
I posted this before, but need some more responses
Not really wanting to state the obvious but I don’t recall seeing it
specifically referred
to; you have tried adjusting the idle speed using the bolt on the side
of the AAV
haven’t you? =-O
TTFN
Bill
Surrey, UK
86 Daimler 4.2, 84 Sovereign 4.2 5spd man, 88 XJ-S 5.3 convertible 5spd man
// please trim quoted text to context onlyOn 25/03/2011 03:35, Ron Hanley wrote:
In reply to a message from BobPhx sent Fri 25 Mar 2011:
After you check all the vac lines look around your intake manifolds.
Mine acted just like yours, I found that the left intake gasket had
failed and developed a major vacuum leak. Tehy may have not
installed the gasket correctly.–
Vans
Tucson, Arizona, United States
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