XJ 4.0L engine whines when cold
02-13-2004, 01:31 PM
#1
Guest
Posts: n/a
XJ 4.0L engine whines when cold
Well, don't we all whine just a little bit when we're cold...
Seriously, though, my 87 XJ 4.0L has developed quite an irritating
whine that begins about 5 minutes after a cold start-up and remains
until shortly after the engine has reached normal operating
temperature (I'd estimate the temperature range this occurs is between
155 and 195 degrees).
It is not related to the drivetrain, as it occurs both when the
vehicle is moving and when it is sitting still in neutral. I don't
notice any significant change in pitch related to engine RPM, although
if I do open the throttle slightly while it's whining the pitch will
actually /lower/ slightly.
Also, I've noticed lately that my MPG has gone through the floor.
Where I used to get 15-16 around town, I now get 13-14.
The sound is loud enough to fill the entire engine compartment, so my
attempts to locate it with my ears have been fruitless. Does anybody
have any ideas what might be happening here? I've heard guesses
ranging from brake booster pump to EGR valve, but those are all just
guesses. I'd really appreciate any help.
TIA,
Matt
87 XJ Laredo - "Leaks n' Squeaks"
Seriously, though, my 87 XJ 4.0L has developed quite an irritating
whine that begins about 5 minutes after a cold start-up and remains
until shortly after the engine has reached normal operating
temperature (I'd estimate the temperature range this occurs is between
155 and 195 degrees).
It is not related to the drivetrain, as it occurs both when the
vehicle is moving and when it is sitting still in neutral. I don't
notice any significant change in pitch related to engine RPM, although
if I do open the throttle slightly while it's whining the pitch will
actually /lower/ slightly.
Also, I've noticed lately that my MPG has gone through the floor.
Where I used to get 15-16 around town, I now get 13-14.
The sound is loud enough to fill the entire engine compartment, so my
attempts to locate it with my ears have been fruitless. Does anybody
have any ideas what might be happening here? I've heard guesses
ranging from brake booster pump to EGR valve, but those are all just
guesses. I'd really appreciate any help.
TIA,
Matt
87 XJ Laredo - "Leaks n' Squeaks"
02-13-2004, 01:37 PM
#2
Guest
Posts: n/a
Re: XJ 4.0L engine whines when cold
Power streering Pump maybe????
I do know of some that whine when cold.
Matthew Crouse wrote:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
>
> Also, I've noticed lately that my MPG has gone through the floor.
> Where I used to get 15-16 around town, I now get 13-14.
>
> The sound is loud enough to fill the entire engine compartment, so my
> attempts to locate it with my ears have been fruitless. Does anybody
> have any ideas what might be happening here? I've heard guesses
> ranging from brake booster pump to EGR valve, but those are all just
> guesses. I'd really appreciate any help.
>
> TIA,
> Matt
> 87 XJ Laredo - "Leaks n' Squeaks"
I do know of some that whine when cold.
Matthew Crouse wrote:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
>
> Also, I've noticed lately that my MPG has gone through the floor.
> Where I used to get 15-16 around town, I now get 13-14.
>
> The sound is loud enough to fill the entire engine compartment, so my
> attempts to locate it with my ears have been fruitless. Does anybody
> have any ideas what might be happening here? I've heard guesses
> ranging from brake booster pump to EGR valve, but those are all just
> guesses. I'd really appreciate any help.
>
> TIA,
> Matt
> 87 XJ Laredo - "Leaks n' Squeaks"
02-13-2004, 01:37 PM
#3
Guest
Posts: n/a
Re: XJ 4.0L engine whines when cold
Power streering Pump maybe????
I do know of some that whine when cold.
Matthew Crouse wrote:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
>
> Also, I've noticed lately that my MPG has gone through the floor.
> Where I used to get 15-16 around town, I now get 13-14.
>
> The sound is loud enough to fill the entire engine compartment, so my
> attempts to locate it with my ears have been fruitless. Does anybody
> have any ideas what might be happening here? I've heard guesses
> ranging from brake booster pump to EGR valve, but those are all just
> guesses. I'd really appreciate any help.
>
> TIA,
> Matt
> 87 XJ Laredo - "Leaks n' Squeaks"
I do know of some that whine when cold.
Matthew Crouse wrote:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
>
> Also, I've noticed lately that my MPG has gone through the floor.
> Where I used to get 15-16 around town, I now get 13-14.
>
> The sound is loud enough to fill the entire engine compartment, so my
> attempts to locate it with my ears have been fruitless. Does anybody
> have any ideas what might be happening here? I've heard guesses
> ranging from brake booster pump to EGR valve, but those are all just
> guesses. I'd really appreciate any help.
>
> TIA,
> Matt
> 87 XJ Laredo - "Leaks n' Squeaks"
02-13-2004, 01:37 PM
#4
Guest
Posts: n/a
Re: XJ 4.0L engine whines when cold
Power streering Pump maybe????
I do know of some that whine when cold.
Matthew Crouse wrote:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
>
> Also, I've noticed lately that my MPG has gone through the floor.
> Where I used to get 15-16 around town, I now get 13-14.
>
> The sound is loud enough to fill the entire engine compartment, so my
> attempts to locate it with my ears have been fruitless. Does anybody
> have any ideas what might be happening here? I've heard guesses
> ranging from brake booster pump to EGR valve, but those are all just
> guesses. I'd really appreciate any help.
>
> TIA,
> Matt
> 87 XJ Laredo - "Leaks n' Squeaks"
I do know of some that whine when cold.
Matthew Crouse wrote:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
>
> Also, I've noticed lately that my MPG has gone through the floor.
> Where I used to get 15-16 around town, I now get 13-14.
>
> The sound is loud enough to fill the entire engine compartment, so my
> attempts to locate it with my ears have been fruitless. Does anybody
> have any ideas what might be happening here? I've heard guesses
> ranging from brake booster pump to EGR valve, but those are all just
> guesses. I'd really appreciate any help.
>
> TIA,
> Matt
> 87 XJ Laredo - "Leaks n' Squeaks"
02-13-2004, 04:03 PM
#5
Guest
Posts: n/a
Re: XJ 4.0L engine whines when cold
Matthew Crouse did pass the time by typing:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
Your describing a belt driven item.
When it whines, turn the steering wheel to full lock plus a bit.
(don't hold it there too long, it's hard on the pump) If you get
a real LOUD whine then it might be the bearings on the power steering
pump have gone. Next turn on the A/C and listen for any change.
If it goes away then it's the A/C clutch or bearing.
As for the rest, those are harder. Usually if the waterpump/fan
is going you have a puddle.
Make yourself a mechanics stethoscope. (or buy one)
http://www.bobstools.com/Store/LS52500.html
- long piece of plastic tube
- short piece of copper tube
you slide the plastic over the copper tube.
Stick the plastic end up to your ear and touch the
suspected componets with the copper end. Just don't get
it into the moving parts, that would be bad. :)
With that you can listen to individual things. Like injectors,
valves, etc. a very handy tool.
--
DougW
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
Your describing a belt driven item.
When it whines, turn the steering wheel to full lock plus a bit.
(don't hold it there too long, it's hard on the pump) If you get
a real LOUD whine then it might be the bearings on the power steering
pump have gone. Next turn on the A/C and listen for any change.
If it goes away then it's the A/C clutch or bearing.
As for the rest, those are harder. Usually if the waterpump/fan
is going you have a puddle.
Make yourself a mechanics stethoscope. (or buy one)
http://www.bobstools.com/Store/LS52500.html
- long piece of plastic tube
- short piece of copper tube
you slide the plastic over the copper tube.
Stick the plastic end up to your ear and touch the
suspected componets with the copper end. Just don't get
it into the moving parts, that would be bad. :)
With that you can listen to individual things. Like injectors,
valves, etc. a very handy tool.
--
DougW
02-13-2004, 04:03 PM
#6
Guest
Posts: n/a
Re: XJ 4.0L engine whines when cold
Matthew Crouse did pass the time by typing:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
Your describing a belt driven item.
When it whines, turn the steering wheel to full lock plus a bit.
(don't hold it there too long, it's hard on the pump) If you get
a real LOUD whine then it might be the bearings on the power steering
pump have gone. Next turn on the A/C and listen for any change.
If it goes away then it's the A/C clutch or bearing.
As for the rest, those are harder. Usually if the waterpump/fan
is going you have a puddle.
Make yourself a mechanics stethoscope. (or buy one)
http://www.bobstools.com/Store/LS52500.html
- long piece of plastic tube
- short piece of copper tube
you slide the plastic over the copper tube.
Stick the plastic end up to your ear and touch the
suspected componets with the copper end. Just don't get
it into the moving parts, that would be bad. :)
With that you can listen to individual things. Like injectors,
valves, etc. a very handy tool.
--
DougW
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
Your describing a belt driven item.
When it whines, turn the steering wheel to full lock plus a bit.
(don't hold it there too long, it's hard on the pump) If you get
a real LOUD whine then it might be the bearings on the power steering
pump have gone. Next turn on the A/C and listen for any change.
If it goes away then it's the A/C clutch or bearing.
As for the rest, those are harder. Usually if the waterpump/fan
is going you have a puddle.
Make yourself a mechanics stethoscope. (or buy one)
http://www.bobstools.com/Store/LS52500.html
- long piece of plastic tube
- short piece of copper tube
you slide the plastic over the copper tube.
Stick the plastic end up to your ear and touch the
suspected componets with the copper end. Just don't get
it into the moving parts, that would be bad. :)
With that you can listen to individual things. Like injectors,
valves, etc. a very handy tool.
--
DougW
02-13-2004, 04:03 PM
#7
Guest
Posts: n/a
Re: XJ 4.0L engine whines when cold
Matthew Crouse did pass the time by typing:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
Your describing a belt driven item.
When it whines, turn the steering wheel to full lock plus a bit.
(don't hold it there too long, it's hard on the pump) If you get
a real LOUD whine then it might be the bearings on the power steering
pump have gone. Next turn on the A/C and listen for any change.
If it goes away then it's the A/C clutch or bearing.
As for the rest, those are harder. Usually if the waterpump/fan
is going you have a puddle.
Make yourself a mechanics stethoscope. (or buy one)
http://www.bobstools.com/Store/LS52500.html
- long piece of plastic tube
- short piece of copper tube
you slide the plastic over the copper tube.
Stick the plastic end up to your ear and touch the
suspected componets with the copper end. Just don't get
it into the moving parts, that would be bad. :)
With that you can listen to individual things. Like injectors,
valves, etc. a very handy tool.
--
DougW
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
Your describing a belt driven item.
When it whines, turn the steering wheel to full lock plus a bit.
(don't hold it there too long, it's hard on the pump) If you get
a real LOUD whine then it might be the bearings on the power steering
pump have gone. Next turn on the A/C and listen for any change.
If it goes away then it's the A/C clutch or bearing.
As for the rest, those are harder. Usually if the waterpump/fan
is going you have a puddle.
Make yourself a mechanics stethoscope. (or buy one)
http://www.bobstools.com/Store/LS52500.html
- long piece of plastic tube
- short piece of copper tube
you slide the plastic over the copper tube.
Stick the plastic end up to your ear and touch the
suspected componets with the copper end. Just don't get
it into the moving parts, that would be bad. :)
With that you can listen to individual things. Like injectors,
valves, etc. a very handy tool.
--
DougW
02-13-2004, 11:50 PM
#8
Guest
Posts: n/a
Re: XJ 4.0L engine whines when cold
On Fri, 13 Feb 2004 18:31:11 UTC mcrouse@hotmail.com (Matthew Crouse)
wrote:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
>
> Also, I've noticed lately that my MPG has gone through the floor.
> Where I used to get 15-16 around town, I now get 13-14.
>
> The sound is loud enough to fill the entire engine compartment, so my
> attempts to locate it with my ears have been fruitless. Does anybody
> have any ideas what might be happening here? I've heard guesses
> ranging from brake booster pump to EGR valve, but those are all just
> guesses. I'd really appreciate any help.
I would be looking hard at the fan clutch. It's a PITA to get a
stethascope (or a piece of hose) close enough to it to isolate it but
that sounds like something I've heard before - just before the fan
outran the rest of the car and had my radiator for lunch.
--
Will Honea <whonea@codenet.net>
wrote:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
>
> Also, I've noticed lately that my MPG has gone through the floor.
> Where I used to get 15-16 around town, I now get 13-14.
>
> The sound is loud enough to fill the entire engine compartment, so my
> attempts to locate it with my ears have been fruitless. Does anybody
> have any ideas what might be happening here? I've heard guesses
> ranging from brake booster pump to EGR valve, but those are all just
> guesses. I'd really appreciate any help.
I would be looking hard at the fan clutch. It's a PITA to get a
stethascope (or a piece of hose) close enough to it to isolate it but
that sounds like something I've heard before - just before the fan
outran the rest of the car and had my radiator for lunch.
--
Will Honea <whonea@codenet.net>
02-13-2004, 11:50 PM
#9
Guest
Posts: n/a
Re: XJ 4.0L engine whines when cold
On Fri, 13 Feb 2004 18:31:11 UTC mcrouse@hotmail.com (Matthew Crouse)
wrote:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
>
> Also, I've noticed lately that my MPG has gone through the floor.
> Where I used to get 15-16 around town, I now get 13-14.
>
> The sound is loud enough to fill the entire engine compartment, so my
> attempts to locate it with my ears have been fruitless. Does anybody
> have any ideas what might be happening here? I've heard guesses
> ranging from brake booster pump to EGR valve, but those are all just
> guesses. I'd really appreciate any help.
I would be looking hard at the fan clutch. It's a PITA to get a
stethascope (or a piece of hose) close enough to it to isolate it but
that sounds like something I've heard before - just before the fan
outran the rest of the car and had my radiator for lunch.
--
Will Honea <whonea@codenet.net>
wrote:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
>
> Also, I've noticed lately that my MPG has gone through the floor.
> Where I used to get 15-16 around town, I now get 13-14.
>
> The sound is loud enough to fill the entire engine compartment, so my
> attempts to locate it with my ears have been fruitless. Does anybody
> have any ideas what might be happening here? I've heard guesses
> ranging from brake booster pump to EGR valve, but those are all just
> guesses. I'd really appreciate any help.
I would be looking hard at the fan clutch. It's a PITA to get a
stethascope (or a piece of hose) close enough to it to isolate it but
that sounds like something I've heard before - just before the fan
outran the rest of the car and had my radiator for lunch.
--
Will Honea <whonea@codenet.net>
02-13-2004, 11:50 PM
#10
Guest
Posts: n/a
Re: XJ 4.0L engine whines when cold
On Fri, 13 Feb 2004 18:31:11 UTC mcrouse@hotmail.com (Matthew Crouse)
wrote:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
>
> Also, I've noticed lately that my MPG has gone through the floor.
> Where I used to get 15-16 around town, I now get 13-14.
>
> The sound is loud enough to fill the entire engine compartment, so my
> attempts to locate it with my ears have been fruitless. Does anybody
> have any ideas what might be happening here? I've heard guesses
> ranging from brake booster pump to EGR valve, but those are all just
> guesses. I'd really appreciate any help.
I would be looking hard at the fan clutch. It's a PITA to get a
stethascope (or a piece of hose) close enough to it to isolate it but
that sounds like something I've heard before - just before the fan
outran the rest of the car and had my radiator for lunch.
--
Will Honea <whonea@codenet.net>
wrote:
> Well, don't we all whine just a little bit when we're cold...
>
> Seriously, though, my 87 XJ 4.0L has developed quite an irritating
> whine that begins about 5 minutes after a cold start-up and remains
> until shortly after the engine has reached normal operating
> temperature (I'd estimate the temperature range this occurs is between
> 155 and 195 degrees).
>
> It is not related to the drivetrain, as it occurs both when the
> vehicle is moving and when it is sitting still in neutral. I don't
> notice any significant change in pitch related to engine RPM, although
> if I do open the throttle slightly while it's whining the pitch will
> actually /lower/ slightly.
>
> Also, I've noticed lately that my MPG has gone through the floor.
> Where I used to get 15-16 around town, I now get 13-14.
>
> The sound is loud enough to fill the entire engine compartment, so my
> attempts to locate it with my ears have been fruitless. Does anybody
> have any ideas what might be happening here? I've heard guesses
> ranging from brake booster pump to EGR valve, but those are all just
> guesses. I'd really appreciate any help.
I would be looking hard at the fan clutch. It's a PITA to get a
stethascope (or a piece of hose) close enough to it to isolate it but
that sounds like something I've heard before - just before the fan
outran the rest of the car and had my radiator for lunch.
--
Will Honea <whonea@codenet.net>