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90 XJ tapping/ticking from valve cover



 
 
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  #11  
Old July 20th 06, 02:21 AM posted to rec.autos.makers.jeep+willys
Jeff DeWitt
external usenet poster
 
Posts: 175
Default 90 XJ tapping/ticking from valve cover

Troy wrote:
> Yes the ticking is all the time, its just when its hot and idling its
> somewhat loud, enough to where people ask me why it's ticking, and as I am
> driving the oil pressure raises a bit, but if I stick my head out the window
> I can still hear the ticking, but faster and not as loud.
>
> I will try to get the idling problem sorted out first, maybe its so low that
> it isn't lubing up whatever is making the ticking sound to begin with.
>
> Troy
>
>
> "c" > wrote in message ...
>
>>I was under the impression that the ticking happened all the time when the
>>engine was hot, not just at idle. Maybe I assumed something I shouldn't
>>have, but if the ticking is just at idle, then Mike is right, you probably
>>don't need to open the engine up. Definitely fix the idle problem first.
>>
>>Chris
>>
>>"Mike Romain" > wrote in message
...
>>
>>>You get ticking because you have no oil pressure because your idle is
>>>too low. Likely no need to open anything up.
>>>
>>>I find a spray electronic contact cleaner clean on all the plugs and
>>>sockets, especially around the throttle body does them wonders.
>>>
>>>Same for cleaning out that idle air passage.
>>>
>>>Mike
>>>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>>88 Cherokee 235 BFG AT's
>>>Canadian Off Road Trips Photos: Non members can still view!
>>>Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>>>(More Off Road album links at bottom of the view page)
>>>
>>>Troy wrote:
>>>
>>>>Yeah it gets idling so low after getting fully warmed up that sometimes
>>>>I
>>>>just knock it into neutral so it doesn't stall out... it stalled out
>>>>once a
>>>>week ago but hasn't since, but I haven't given it the chance.
>>>>
>>>>A few connections were cruddy when I got the thing, I will clean/check
>>>>all
>>>>the connections you mentioned
>>>>
>>>>I've never done this, but to find out which lifter or whatever exactly
>>>>is
>>>>ticking, am I able to run the engine with the valve cover off? I
>>>>realize
>>>>that must sound like a stupid question to a mechanic type who has done
>>>>this
>>>>kind of work before, but I don't know because I've never done that
>>>>before.
>>>>I don't know if the oil splash is strong enough to shoot out, or even
>>>>where
>>>>the oil splashes from.
>>>>
>>>>I'll save the thicker oil for last maybe, but what would be the next
>>>>step up
>>>>from 10w30? I've seen 20w50 oil in the store before, but I dont know if
>>>>thats the next step up. All the vehicles I've owned run 10w30 so I've
>>>>never
>>>>had to use thicker but it was suggested by a neighbor. (not a mechanic,
>>>>I
>>>>trust you guys more)
>>>>
>>>>Troy
>>>>
>>>>"c" > wrote in message
...
>>>>
>>>>>Fist thing that is wrong is the idle speed. Idling an engine that slow
>>>>>is
>>>>>bad. Many engine components rely on oil splash for lubrication. The
>>>>>camshaft, timing chain, and valve springs are the most critical. I
>>>>>mention
>>>>>valve springs because they need oil splash for cooling. You compound
>>>>>the
>>>>>problem if you do indeed have a low pressure situation at idle. I
>>>>>would
>>>>>suspect that the Idle Air Control valve may be the culprit. These tens
>>>>>to
>>>>>get carboned up over time. It is easy to pull the valve and clean it.
>>>>>Also
>>>>>check the electrical connections to the valve, they may be corroded as
>>>>>well. To clean the valve, you just need a can of fuel injection
>>>>>compatible
>>>>>carb cleaner. there is a plunger that controls the valve, and it needs
>>>>>to
>>>>>operate freely for the valve to work properly.
>>>>>
>>>>>The ticking is more than likely something in the valvetrain, but could
>>>>>also be a piston pin, or less probably a rod bearing. Usually you can
>>>>>tell
>>>>>if it is a piston pin by starting the engine with the plug wire from
>>>>>the
>>>>>suspect cylinder disconnected. If it is a pin, the noise with decrease
>>>>>noticeably without the plugwire hooked up.
>>>>>
>>>>>I would most likely suspect a lifter is bleeding down when the oil
>>>>>gets
>>>>>hot. Not much to do about it other than replace the lifter(s). Using
>>>>>heavier oil may patch the problem for a while, but more than likely it
>>>>>will resurface later as things get worse. There are downfalls to using
>>>>>too
>>>>>heavy an oil, but going up one range should be fine considering you're
>>>>>in
>>>>>a hot climate. First thing you need to do is fix the idle speed issue,
>>>>>as
>>>>>I would imagine using heavier oil and idling that slow will cause even
>>>>>more problems related to the parts needing splash oil for lubricant.
>>>>>
>>>>>Chris
>>>>>
>>>>>"Troy" <@ .> wrote in message
>>>>>news:7qedneilz4m_ryDZnZ2dnUVZ_sCdnZ2d@comcast .com...
>>>>>
>>>>>>When I start this thing its quiet, but after driving it around and
>>>>>>the
>>>>>>oil I suspect gets warmed up there's a ticking coming from the
>>>>>>valvecover
>>>>>>area, maybe under it. I can't feel the ticking but just hear it.
>>>>>>Usually when the oil gets hot and I notice the pressure drops while
>>>>>>idling. I know the oil is thinning when it gets hot so maybe the oil
>>>>>>pump could use replacing? Or should I do some work on the
>>>>>>valve/lifters/whatever? I have tools and if its something that I may
>>>>>>be
>>>>>>able to tackle if I get the right manual I would like to do it
>>>>>>myself. I
>>>>>>will buy tools if I need to.
>>>>>>
>>>>>>The engine has 150,000 miles on it, and I dont think its had any
>>>>>>major
>>>>>>work done to it. Could I maybe put a thicker oil in it to silence
>>>>>>the
>>>>>>ticking? Could someone out there let me know what all these things
>>>>>>would
>>>>>>do and suggest others I might try? Other than the ticking it's
>>>>>>perfect,
>>>>>>although it tends to idle around the 250 rpm mark when at a stoplight
>>>>>>after it's all warmed up.
>>>>>>
>>>>>>Oh and it's hot in florida
>>>>>>
>>>>>>Troy
>>>>>>
>>>>>
>>>>>

>>

>
>

Do you have an oil pressure gauge? It would be interesting to know how
the oil pressure is doing.

Jeff DeWitt
Ads
  #12  
Old July 20th 06, 02:30 AM posted to rec.autos.makers.jeep+willys
Troy
external usenet poster
 
Posts: 94
Default 90 XJ tapping/ticking from valve cover

Nope sorry I dont have an oil pressure gauge... but I will buy one soon as I
get the money. Where does this gauge hook up on the engine? I've never
seen or used one.

Today I wrote down the measurements on the gauges:
When cold, at idle: ~750 rpms in park, pressure from the gauge read ~50
When cold, at 2000 rpms driving: oil pressure on the gauge read ~58

When hot driving home:
Idle ~250 rpms (yeah I gotta fix that,working on it) and pressure from the
gauge read ~20
Driving at 2000 rpms the oil pressure gauge read ~30

I didn't get a chance to clean the connectors n such today, but what
exactly controls the idle speed? The TPS? I plan on taking alot of stuff
apart tomorrow and cleaning and reassembling it all.

Troy

"
> Do you have an oil pressure gauge? It would be interesting to know how
> the oil pressure is doing.
>
> Jeff DeWitt



  #13  
Old July 20th 06, 03:00 AM posted to rec.autos.makers.jeep+willys
Jeff DeWitt
external usenet poster
 
Posts: 175
Default 90 XJ tapping/ticking from valve cover

OK, now I'm officially confused. You don't have a gage but your giving
pressure readings, are those from the gage in the instrument panel?

Assuming that's the case those sound like reasonable readings to me.

Thought occurred to me, if it's got 150,000 miles and the oil was pretty
much black you may have a lifter that's sludged or varnished. I believe
those things have pretty small holes and if they get clogged the lifter
isn't going to work properly and it's going to click.

If it was mine, the oil pressure is OK and the engine seemed to be
running pretty well and it's just a tap or a click from fairly high up
in the engine I think I'd just drive it, making sure to change the oil
regularly, maybe even a bit more often than normal.

With a bit of luck the problem may fix itself with that treatment, if it
doesn't than you might try flushing the engine with some Rislone or
something similar.

But fix the idle first!

Jeff DeWitt

Troy wrote:
> Nope sorry I dont have an oil pressure gauge... but I will buy one soon as I
> get the money. Where does this gauge hook up on the engine? I've never
> seen or used one.
>
> Today I wrote down the measurements on the gauges:
> When cold, at idle: ~750 rpms in park, pressure from the gauge read ~50
> When cold, at 2000 rpms driving: oil pressure on the gauge read ~58
>
> When hot driving home:
> Idle ~250 rpms (yeah I gotta fix that,working on it) and pressure from the
> gauge read ~20
> Driving at 2000 rpms the oil pressure gauge read ~30
>
> I didn't get a chance to clean the connectors n such today, but what
> exactly controls the idle speed? The TPS? I plan on taking alot of stuff
> apart tomorrow and cleaning and reassembling it all.
>
> Troy
>
> "
>
>>Do you have an oil pressure gauge? It would be interesting to know how
>>the oil pressure is doing.
>>
>>Jeff DeWitt

>
>
>

  #14  
Old July 20th 06, 08:04 PM posted to rec.autos.makers.jeep+willys
Troy
external usenet poster
 
Posts: 94
Default 90 XJ tapping/ticking from valve cover

Heh well yeah there's an oil pressure gauge on the instrument panel, I was
somehow thinking you were meaning an external gauge that I would temporarily
hook up for a more accurate/scientific measurement. Oops

I will try to find out how to fix the idle and let ya'll know what's going
on with it afterwards.

Troy


"Jeff DeWitt" > wrote in message
m...
> OK, now I'm officially confused. You don't have a gage but your giving
> pressure readings, are those from the gage in the instrument panel?
>
> Assuming that's the case those sound like reasonable readings to me.
>
> Thought occurred to me, if it's got 150,000 miles and the oil was pretty
> much black you may have a lifter that's sludged or varnished. I believe
> those things have pretty small holes and if they get clogged the lifter
> isn't going to work properly and it's going to click.
>
> If it was mine, the oil pressure is OK and the engine seemed to be running
> pretty well and it's just a tap or a click from fairly high up in the
> engine I think I'd just drive it, making sure to change the oil regularly,
> maybe even a bit more often than normal.
>
> With a bit of luck the problem may fix itself with that treatment, if it
> doesn't than you might try flushing the engine with some Rislone or
> something similar.
>
> But fix the idle first!
>
> Jeff DeWitt
>
> Troy wrote:
>> Nope sorry I dont have an oil pressure gauge... but I will buy one soon
>> as I get the money. Where does this gauge hook up on the engine? I've
>> never seen or used one.
>>
>> Today I wrote down the measurements on the gauges:
>> When cold, at idle: ~750 rpms in park, pressure from the gauge read ~50
>> When cold, at 2000 rpms driving: oil pressure on the gauge read ~58
>>
>> When hot driving home:
>> Idle ~250 rpms (yeah I gotta fix that,working on it) and pressure from
>> the gauge read ~20
>> Driving at 2000 rpms the oil pressure gauge read ~30
>>
>> I didn't get a chance to clean the connectors n such today, but what
>> exactly controls the idle speed? The TPS? I plan on taking alot of
>> stuff apart tomorrow and cleaning and reassembling it all.
>>
>> Troy
>>
>> "
>>
>>>Do you have an oil pressure gauge? It would be interesting to know how
>>>the oil pressure is doing.
>>>
>>>Jeff DeWitt

>>
>>


  #15  
Old July 20th 06, 08:23 PM posted to rec.autos.makers.jeep+willys
[email protected]
external usenet poster
 
Posts: 1
Default 90 XJ tapping/ticking from valve cover

Every six to ten months I get ticking. For a long time I thought it
was lifters or exhaust noise. It drove me nuts not being able to find
the root cause. Then one day I was reading a thread about carbon
deposits not allowing valves to seat properly. I contemplated using
ATF but settled on 12 oz of water poured down the throttle body just
fast enough to make the motor start to stumble. Lot's of white smoke
out the back for a few minutes but it stops it (the ticking) almost
immediately. Lasts for a good long time. I think my Jeep runs a
llittle lean. Maybe it's just that simple for you too?

Brian

  #16  
Old July 20th 06, 09:15 PM posted to rec.autos.makers.jeep+willys
Mike Romain
external usenet poster
 
Posts: 3,758
Default 90 XJ tapping/ticking from valve cover

Another thing that causes a ticking is the notorious cracked manifold.
That can imitate a valve tick that happens as it warms up.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

" wrote:
>
> Every six to ten months I get ticking. For a long time I thought it
> was lifters or exhaust noise. It drove me nuts not being able to find
> the root cause. Then one day I was reading a thread about carbon
> deposits not allowing valves to seat properly. I contemplated using
> ATF but settled on 12 oz of water poured down the throttle body just
> fast enough to make the motor start to stumble. Lot's of white smoke
> out the back for a few minutes but it stops it (the ticking) almost
> immediately. Lasts for a good long time. I think my Jeep runs a
> llittle lean. Maybe it's just that simple for you too?
>
> Brian

  #17  
Old July 21st 06, 12:59 AM posted to rec.autos.makers.jeep+willys
One out of many daves
external usenet poster
 
Posts: 40
Default 90 XJ tapping/ticking from valve cover

Could it also be some sludge or dried oil crud floating around in the oil
pan? Or even blocking the oil return holes in the cyl. head.
When you first start it this debris is in the bottom of the oil pan and the
oil pump pickup screen is clean. Then as you drive it around the debris
moves around and starts clogging up the screen and oil begins to stop
flowing to the rest of the engine.

I changed the valve cover on a '93 XJ 4.0 and the debris around the valve
springs was super thick. I plugged the oil return holes, scraped the debris
off and blew it away with some compressed air. Owner was quite pleased and
said the engine was running smoother and quieter.
Of course I changed the oil too and hoped any debris down in the pan area
came out.

Maybe some engine flushing and frequent oil changes make help! ;-)

Just a thought!
--
later,
dave AKA vwdoc1


 




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