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XJ Ask the Question Thread
Seasoned Member
Join Date: Dec 2012
Location: Middletown, Maryland
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Year: 1998
Model: Cherokee
Engine: 4.0 I6
Seasoned Member
Join Date: Dec 2012
Location: Middletown, Maryland
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Year: 1998
Model: Cherokee
Engine: 4.0 I6
ok so today I finished cleaning up the jeep a bit. took it out for a drive enjoying the day. I noticed this super high piched whine when I throttle. I mean like dog whistle time whine. but only at a certain point then when I would increases the throttle it went away back to a coast and it comes back. almost like a ringing of the ears noise... any idea what could cause it? I cant seem to pin point the noise.
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Join Date: Aug 2011
Location: Prescott, Az
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
ok so today I finished cleaning up the jeep a bit. took it out for a drive enjoying the day. I noticed this super high piched whine when I throttle. I mean like dog whistle time whine. but only at a certain point then when I would increases the throttle it went away back to a coast and it comes back. almost like a ringing of the ears noise... any idea what could cause it? I cant seem to pin point the noise.
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Year: 1993
Model: Cherokee
Engine: 4.0L
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Year: 1998 and 1988
Model: Cherokee
Engine: 4.7
Possibly bad connectors. Make sure your voltage is roughly 14.25V when engine is running. If it is around 12 ish, it means your alternator is either not charging or there is a bad connection somewhere.
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Join Date: Oct 2011
Location: South Mills, NC
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Year: 1998
Model: Cherokee
Engine: Rebuilt 4.0L I6
My alternator puts out 13.75 when tested at the battery. Its a 117amp alternator
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Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
Seasoned Member
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Year: 1998
Model: Cherokee
Engine: 4.0 I6
I've never heard of a car that needed to have the battery recharged separate of the alternator if it dies. That's the point of the alternator. and I've killed the Jeeps battery several times in the past and not had the same problem.
Last edited by KG8893; 09-15-2013 at 07:29 PM.
::CF Moderator::
Join Date: Aug 2011
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Alternators keep a battery charged under normal useage. They're not battery chargers.
Also, your battery may be getting weak?
Also, your battery may be getting weak?
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Year: 1998
Model: Cherokee
Engine: 4.0 I6
Edit... charged up fine with the charger.
Also like I said... if the alternator couldn't charge the battery back up they would never have invented jumper cables cause they wouldn't work.
Last edited by KG8893; 09-15-2013 at 07:33 PM.
Seasoned Member
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Year: 1998
Model: Cherokee
Engine: 4.0 I6
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Well, some of this new fangled stuff, ya know. Voltage regulator in the PCM, relearning in the PCM after a dead battery.
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Year: 1998
Model: Cherokee
Engine: 4.0 I6
I've always been able to just drive away and have the jeep run fine once I get it jumped. The alternator has always CHARGED my battery fine.
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Don't know what to tell ya then.
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Year: 1998
Model: Cherokee
Engine: 4.0 I6