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" |
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" |
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" |
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" |
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 |
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 |
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 |
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> |
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> |
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> |
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