Hammering / knocking noise on 4.0L6 '99 Cherokee
#11
Guest
Posts: n/a
Re: Hammering / knocking noise on 4.0L6 '99 Cherokee
Hydraulic lifters can make an intermittent noise such as you describe. This
is because the source of the noise is a lifter that has not been filled with
oil. This is usually caused by a bad seal or a blockage, but sometimes they
pump down over night; sometimes not. Back in previous decades when these
things were a relatively new design they would act up when the vehicle
needed an oil change. After an oil change, all would be quiet again. Now
they are thought to be better designed, but you still get one acting up now
and then.
Humidity where you live could contribute to oil contamination and lifter
failure, but since you change your oil fairly often (manufacturers recommend
7,000 miles) I do not suspect this as the cause.
Earle
"Robert Goldpalm" <goldpalm@loxinfo.co.th> wrote in message
news:68468edd.0311092202.7eff882d@posting.google.c om...
> Could the cause of this problem be found
> within the electronic / contact / sensor input complex?
>
> Today, no noise at all, so far. No noise at cold start,
> no noise during normal driving conditions with a warm
> engine. No noise whatsoever.
>
> So, if it would be a purely mechanical problem such as
> piston slap, hydraulic lifters, or carbon build up, why is
> there no noise today?
>
> I am living in the tropics (Thailand) with a very high humidity
> of around 80-90%. Could it be, that somewhere, an electronic
> contact or a wrong sensor input causes the engine to produce
> this ticking / knocking sounds sometimes?
is because the source of the noise is a lifter that has not been filled with
oil. This is usually caused by a bad seal or a blockage, but sometimes they
pump down over night; sometimes not. Back in previous decades when these
things were a relatively new design they would act up when the vehicle
needed an oil change. After an oil change, all would be quiet again. Now
they are thought to be better designed, but you still get one acting up now
and then.
Humidity where you live could contribute to oil contamination and lifter
failure, but since you change your oil fairly often (manufacturers recommend
7,000 miles) I do not suspect this as the cause.
Earle
"Robert Goldpalm" <goldpalm@loxinfo.co.th> wrote in message
news:68468edd.0311092202.7eff882d@posting.google.c om...
> Could the cause of this problem be found
> within the electronic / contact / sensor input complex?
>
> Today, no noise at all, so far. No noise at cold start,
> no noise during normal driving conditions with a warm
> engine. No noise whatsoever.
>
> So, if it would be a purely mechanical problem such as
> piston slap, hydraulic lifters, or carbon build up, why is
> there no noise today?
>
> I am living in the tropics (Thailand) with a very high humidity
> of around 80-90%. Could it be, that somewhere, an electronic
> contact or a wrong sensor input causes the engine to produce
> this ticking / knocking sounds sometimes?
#12
Guest
Posts: n/a
Re: Hammering / knocking noise on 4.0L6 '99 Cherokee
Hydraulic lifters can make an intermittent noise such as you describe. This
is because the source of the noise is a lifter that has not been filled with
oil. This is usually caused by a bad seal or a blockage, but sometimes they
pump down over night; sometimes not. Back in previous decades when these
things were a relatively new design they would act up when the vehicle
needed an oil change. After an oil change, all would be quiet again. Now
they are thought to be better designed, but you still get one acting up now
and then.
Humidity where you live could contribute to oil contamination and lifter
failure, but since you change your oil fairly often (manufacturers recommend
7,000 miles) I do not suspect this as the cause.
Earle
"Robert Goldpalm" <goldpalm@loxinfo.co.th> wrote in message
news:68468edd.0311092202.7eff882d@posting.google.c om...
> Could the cause of this problem be found
> within the electronic / contact / sensor input complex?
>
> Today, no noise at all, so far. No noise at cold start,
> no noise during normal driving conditions with a warm
> engine. No noise whatsoever.
>
> So, if it would be a purely mechanical problem such as
> piston slap, hydraulic lifters, or carbon build up, why is
> there no noise today?
>
> I am living in the tropics (Thailand) with a very high humidity
> of around 80-90%. Could it be, that somewhere, an electronic
> contact or a wrong sensor input causes the engine to produce
> this ticking / knocking sounds sometimes?
is because the source of the noise is a lifter that has not been filled with
oil. This is usually caused by a bad seal or a blockage, but sometimes they
pump down over night; sometimes not. Back in previous decades when these
things were a relatively new design they would act up when the vehicle
needed an oil change. After an oil change, all would be quiet again. Now
they are thought to be better designed, but you still get one acting up now
and then.
Humidity where you live could contribute to oil contamination and lifter
failure, but since you change your oil fairly often (manufacturers recommend
7,000 miles) I do not suspect this as the cause.
Earle
"Robert Goldpalm" <goldpalm@loxinfo.co.th> wrote in message
news:68468edd.0311092202.7eff882d@posting.google.c om...
> Could the cause of this problem be found
> within the electronic / contact / sensor input complex?
>
> Today, no noise at all, so far. No noise at cold start,
> no noise during normal driving conditions with a warm
> engine. No noise whatsoever.
>
> So, if it would be a purely mechanical problem such as
> piston slap, hydraulic lifters, or carbon build up, why is
> there no noise today?
>
> I am living in the tropics (Thailand) with a very high humidity
> of around 80-90%. Could it be, that somewhere, an electronic
> contact or a wrong sensor input causes the engine to produce
> this ticking / knocking sounds sometimes?
#13
Guest
Posts: n/a
Re: Hammering / knocking noise on 4.0L6 '99 Cherokee
Hydraulic lifters can make an intermittent noise such as you describe. This
is because the source of the noise is a lifter that has not been filled with
oil. This is usually caused by a bad seal or a blockage, but sometimes they
pump down over night; sometimes not. Back in previous decades when these
things were a relatively new design they would act up when the vehicle
needed an oil change. After an oil change, all would be quiet again. Now
they are thought to be better designed, but you still get one acting up now
and then.
Humidity where you live could contribute to oil contamination and lifter
failure, but since you change your oil fairly often (manufacturers recommend
7,000 miles) I do not suspect this as the cause.
Earle
"Robert Goldpalm" <goldpalm@loxinfo.co.th> wrote in message
news:68468edd.0311092202.7eff882d@posting.google.c om...
> Could the cause of this problem be found
> within the electronic / contact / sensor input complex?
>
> Today, no noise at all, so far. No noise at cold start,
> no noise during normal driving conditions with a warm
> engine. No noise whatsoever.
>
> So, if it would be a purely mechanical problem such as
> piston slap, hydraulic lifters, or carbon build up, why is
> there no noise today?
>
> I am living in the tropics (Thailand) with a very high humidity
> of around 80-90%. Could it be, that somewhere, an electronic
> contact or a wrong sensor input causes the engine to produce
> this ticking / knocking sounds sometimes?
is because the source of the noise is a lifter that has not been filled with
oil. This is usually caused by a bad seal or a blockage, but sometimes they
pump down over night; sometimes not. Back in previous decades when these
things were a relatively new design they would act up when the vehicle
needed an oil change. After an oil change, all would be quiet again. Now
they are thought to be better designed, but you still get one acting up now
and then.
Humidity where you live could contribute to oil contamination and lifter
failure, but since you change your oil fairly often (manufacturers recommend
7,000 miles) I do not suspect this as the cause.
Earle
"Robert Goldpalm" <goldpalm@loxinfo.co.th> wrote in message
news:68468edd.0311092202.7eff882d@posting.google.c om...
> Could the cause of this problem be found
> within the electronic / contact / sensor input complex?
>
> Today, no noise at all, so far. No noise at cold start,
> no noise during normal driving conditions with a warm
> engine. No noise whatsoever.
>
> So, if it would be a purely mechanical problem such as
> piston slap, hydraulic lifters, or carbon build up, why is
> there no noise today?
>
> I am living in the tropics (Thailand) with a very high humidity
> of around 80-90%. Could it be, that somewhere, an electronic
> contact or a wrong sensor input causes the engine to produce
> this ticking / knocking sounds sometimes?
#14
Guest
Posts: n/a
Re: Hammering / knocking noise on 4.0L6 '99 Cherokee
Did you check your fan clutch?
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Robert Goldpalm wrote:
>
> Could the cause of this problem be found
> within the electronic / contact / sensor input complex?
>
> Today, no noise at all, so far. No noise at cold start,
> no noise during normal driving conditions with a warm
> engine. No noise whatsoever.
>
> So, if it would be a purely mechanical problem such as
> piston slap, hydraulic lifters, or carbon build up, why is
> there no noise today?
>
> I am living in the tropics (Thailand) with a very high humidity
> of around 80-90%. Could it be, that somewhere, an electronic
> contact or a wrong sensor input causes the engine to produce
> this ticking / knocking sounds sometimes?
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Robert Goldpalm wrote:
>
> Could the cause of this problem be found
> within the electronic / contact / sensor input complex?
>
> Today, no noise at all, so far. No noise at cold start,
> no noise during normal driving conditions with a warm
> engine. No noise whatsoever.
>
> So, if it would be a purely mechanical problem such as
> piston slap, hydraulic lifters, or carbon build up, why is
> there no noise today?
>
> I am living in the tropics (Thailand) with a very high humidity
> of around 80-90%. Could it be, that somewhere, an electronic
> contact or a wrong sensor input causes the engine to produce
> this ticking / knocking sounds sometimes?
#15
Guest
Posts: n/a
Re: Hammering / knocking noise on 4.0L6 '99 Cherokee
Did you check your fan clutch?
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Robert Goldpalm wrote:
>
> Could the cause of this problem be found
> within the electronic / contact / sensor input complex?
>
> Today, no noise at all, so far. No noise at cold start,
> no noise during normal driving conditions with a warm
> engine. No noise whatsoever.
>
> So, if it would be a purely mechanical problem such as
> piston slap, hydraulic lifters, or carbon build up, why is
> there no noise today?
>
> I am living in the tropics (Thailand) with a very high humidity
> of around 80-90%. Could it be, that somewhere, an electronic
> contact or a wrong sensor input causes the engine to produce
> this ticking / knocking sounds sometimes?
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Robert Goldpalm wrote:
>
> Could the cause of this problem be found
> within the electronic / contact / sensor input complex?
>
> Today, no noise at all, so far. No noise at cold start,
> no noise during normal driving conditions with a warm
> engine. No noise whatsoever.
>
> So, if it would be a purely mechanical problem such as
> piston slap, hydraulic lifters, or carbon build up, why is
> there no noise today?
>
> I am living in the tropics (Thailand) with a very high humidity
> of around 80-90%. Could it be, that somewhere, an electronic
> contact or a wrong sensor input causes the engine to produce
> this ticking / knocking sounds sometimes?
#16
Guest
Posts: n/a
Re: Hammering / knocking noise on 4.0L6 '99 Cherokee
Did you check your fan clutch?
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Robert Goldpalm wrote:
>
> Could the cause of this problem be found
> within the electronic / contact / sensor input complex?
>
> Today, no noise at all, so far. No noise at cold start,
> no noise during normal driving conditions with a warm
> engine. No noise whatsoever.
>
> So, if it would be a purely mechanical problem such as
> piston slap, hydraulic lifters, or carbon build up, why is
> there no noise today?
>
> I am living in the tropics (Thailand) with a very high humidity
> of around 80-90%. Could it be, that somewhere, an electronic
> contact or a wrong sensor input causes the engine to produce
> this ticking / knocking sounds sometimes?
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Robert Goldpalm wrote:
>
> Could the cause of this problem be found
> within the electronic / contact / sensor input complex?
>
> Today, no noise at all, so far. No noise at cold start,
> no noise during normal driving conditions with a warm
> engine. No noise whatsoever.
>
> So, if it would be a purely mechanical problem such as
> piston slap, hydraulic lifters, or carbon build up, why is
> there no noise today?
>
> I am living in the tropics (Thailand) with a very high humidity
> of around 80-90%. Could it be, that somewhere, an electronic
> contact or a wrong sensor input causes the engine to produce
> this ticking / knocking sounds sometimes?
#17
Guest
Posts: n/a
Re: Hammering / knocking noise on 4.0L6 '99 Cherokee
>
> Robert Goldpalm wrote:
>>
>> Could the cause of this problem be found
>> within the electronic / contact / sensor input complex?
>>
>> Today, no noise at all, so far. No noise at cold start,
>> no noise during normal driving conditions with a warm
>> engine. No noise whatsoever.
>>
>> So, if it would be a purely mechanical problem such as
>> piston slap, hydraulic lifters, or carbon build up, why is
>> there no noise today?
>>
>> I am living in the tropics (Thailand) with a very high humidity
>> of around 80-90%. Could it be, that somewhere, an electronic
>> contact or a wrong sensor input causes the engine to produce
>> this ticking / knocking sounds sometimes?
Approximately 11/10/03 09:04, Mike Romain uttered for posterity:
> Did you check your fan clutch?
Does the vibration damper on the 4.0 get loose and sound
pretty close to a piston knock? Have had it happen on
other engines, dunno if the 4.0 unit can do it. Actually
on the other engine it wasn't loose, it had a big crack
in it that made the most noise when cold.
--
My governor can kick your governor's ***
#18
Guest
Posts: n/a
Re: Hammering / knocking noise on 4.0L6 '99 Cherokee
>
> Robert Goldpalm wrote:
>>
>> Could the cause of this problem be found
>> within the electronic / contact / sensor input complex?
>>
>> Today, no noise at all, so far. No noise at cold start,
>> no noise during normal driving conditions with a warm
>> engine. No noise whatsoever.
>>
>> So, if it would be a purely mechanical problem such as
>> piston slap, hydraulic lifters, or carbon build up, why is
>> there no noise today?
>>
>> I am living in the tropics (Thailand) with a very high humidity
>> of around 80-90%. Could it be, that somewhere, an electronic
>> contact or a wrong sensor input causes the engine to produce
>> this ticking / knocking sounds sometimes?
Approximately 11/10/03 09:04, Mike Romain uttered for posterity:
> Did you check your fan clutch?
Does the vibration damper on the 4.0 get loose and sound
pretty close to a piston knock? Have had it happen on
other engines, dunno if the 4.0 unit can do it. Actually
on the other engine it wasn't loose, it had a big crack
in it that made the most noise when cold.
--
My governor can kick your governor's ***
#19
Guest
Posts: n/a
Re: Hammering / knocking noise on 4.0L6 '99 Cherokee
>
> Robert Goldpalm wrote:
>>
>> Could the cause of this problem be found
>> within the electronic / contact / sensor input complex?
>>
>> Today, no noise at all, so far. No noise at cold start,
>> no noise during normal driving conditions with a warm
>> engine. No noise whatsoever.
>>
>> So, if it would be a purely mechanical problem such as
>> piston slap, hydraulic lifters, or carbon build up, why is
>> there no noise today?
>>
>> I am living in the tropics (Thailand) with a very high humidity
>> of around 80-90%. Could it be, that somewhere, an electronic
>> contact or a wrong sensor input causes the engine to produce
>> this ticking / knocking sounds sometimes?
Approximately 11/10/03 09:04, Mike Romain uttered for posterity:
> Did you check your fan clutch?
Does the vibration damper on the 4.0 get loose and sound
pretty close to a piston knock? Have had it happen on
other engines, dunno if the 4.0 unit can do it. Actually
on the other engine it wasn't loose, it had a big crack
in it that made the most noise when cold.
--
My governor can kick your governor's ***
#20
Guest
Posts: n/a
Re: Hammering / knocking noise on 4.0L6 '99 Cherokee
Lon Stowell wrote:
>
> >
> > Robert Goldpalm wrote:
> >>
> >> Could the cause of this problem be found
> >> within the electronic / contact / sensor input complex?
> >>
> >> Today, no noise at all, so far. No noise at cold start,
> >> no noise during normal driving conditions with a warm
> >> engine. No noise whatsoever.
> >>
> >> So, if it would be a purely mechanical problem such as
> >> piston slap, hydraulic lifters, or carbon build up, why is
> >> there no noise today?
> >>
> >> I am living in the tropics (Thailand) with a very high humidity
> >> of around 80-90%. Could it be, that somewhere, an electronic
> >> contact or a wrong sensor input causes the engine to produce
> >> this ticking / knocking sounds sometimes?
>
> Approximately 11/10/03 09:04, Mike Romain uttered for posterity:
>
> > Did you check your fan clutch?
>
> Does the vibration damper on the 4.0 get loose and sound
> pretty close to a piston knock? Have had it happen on
> other engines, dunno if the 4.0 unit can do it. Actually
> on the other engine it wasn't loose, it had a big crack
> in it that made the most noise when cold.
>
> --
Yes, it can go bad, but usually it starts eating the fan belt before it
knocks from what I have read.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
>
> >
> > Robert Goldpalm wrote:
> >>
> >> Could the cause of this problem be found
> >> within the electronic / contact / sensor input complex?
> >>
> >> Today, no noise at all, so far. No noise at cold start,
> >> no noise during normal driving conditions with a warm
> >> engine. No noise whatsoever.
> >>
> >> So, if it would be a purely mechanical problem such as
> >> piston slap, hydraulic lifters, or carbon build up, why is
> >> there no noise today?
> >>
> >> I am living in the tropics (Thailand) with a very high humidity
> >> of around 80-90%. Could it be, that somewhere, an electronic
> >> contact or a wrong sensor input causes the engine to produce
> >> this ticking / knocking sounds sometimes?
>
> Approximately 11/10/03 09:04, Mike Romain uttered for posterity:
>
> > Did you check your fan clutch?
>
> Does the vibration damper on the 4.0 get loose and sound
> pretty close to a piston knock? Have had it happen on
> other engines, dunno if the 4.0 unit can do it. Actually
> on the other engine it wasn't loose, it had a big crack
> in it that made the most noise when cold.
>
> --
Yes, it can go bad, but usually it starts eating the fan belt before it
knocks from what I have read.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's