Speedo suges to 100 MPH then back down to 0.
#1
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Year: 1990/2001
Model: Cherokee
Engine: 4.0
Speedo surges to 100 MPH then back down to 0.
I came to a stop sign and rolled off the brake, when I started to push down on the throttle it seemed to bog and the speedo jumped to about 100 then came back down and was fine after that. When I started to park it surged a couple of times to about 60 but didnt feel the Jeep bog at all. Has any one ever experiance something like this? Any info will be greatly appreciated. By the way this happened to my 01 XJ.
Last edited by bajaxj; 03-16-2012 at 07:56 PM.
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Year: 1990/2001
Model: Cherokee
Engine: 4.0
I took it for a drive a few minutes ago and mi check gauges light came on, mi alt gague was all the way down so I guess mi alternator is shot. I wont be able to check it till it stops raining
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Year: 1991
Model: Cherokee
Engine: 4.0
K. Now sweat it. Keep checkin the forum for great advice! I would have that alt checked again. Could be wiring between batt and alt? Def check the wiring, grounding issues mentioned. Keep us posted.
Last edited by Disoriented Hillbilly; 03-17-2012 at 09:54 PM.
#6
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Year: 1990/2001
Model: Cherokee
Engine: 4.0
Any one know if the alternator on the 01 XJ has an external regulator? Cause I found a 136amp alternator for a V8 GC at my local Oreilly that they actually have in stock, but it has an external regulator.
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Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
The regulator is built into the PCM, so yeah, it is an external regulated alternator. Your funky alternator is also causing the speedo problem you're having, low voltage will cause all kinds of weirdness to happen. That 136 GC alternator may require some slight modification in order to mount up to your XJ.
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#8
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Year: 1990/2001
Model: Cherokee
Engine: 4.0
The regulator is built into the PCM, so yeah, it is an external regulated alternator. Your funky alternator is also causing the speedo problem you're having, low voltage will cause all kinds of weirdness to happen. That 136 GC alternator may require some slight modification in order to mount up to your XJ.
Last edited by bajaxj; 03-18-2012 at 03:02 PM.
#12
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Year: 1995
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Engine: 4.0 with all of the noise and clatter
In my opinion it's not worth the trouble for a 12amp increase, but the wiring is the same between the XJ and ZJ V8 alternators from 93-2001.
#13
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Year: 1990/2001
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Thanks for the reply. I guess if I decide to go with the GC alternator I'll just get one from the JY and have it rebuilt
Last edited by bajaxj; 03-20-2012 at 12:09 AM.
#14
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Year: 1990/2001
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Update. I went ahead and bought an alternator from Oreiley and the Jeep is running once again(I will drive it to work tomorrow and see how it goes).
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