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Unread 09-16-2006, 03:15 PM   #1
schwa
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Driving 100kph = 3,000rpms
Normally driving at 100kph on the highway I'd get about 2,100 rpms but just recently it would reach up to 3,000rpm's. On the odd time it would level out back down to 2,100 give or take.

Could this be a faulty sensor? Or just a leak in the exhaust manifold/pipes?


I have a 94 Grand Cherokee, I'll be replacing the cat convertor, muffler and oxygen sensor soon.

Anyone have any ideas of why I'm getting such a high rpm?

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Unread 09-16-2006, 04:08 PM   #2
KingPrat
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Sounds kinda like your TPS
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Unread 09-16-2006, 04:23 PM   #3
rm2001wj
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You are using the tach to read the engine speed increase, but do you hear the engine speed increase as well? If you do, then I would suspect a problem with the transmission.
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Unread 09-16-2006, 04:37 PM   #4
schwa
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Figures, i guess my 1st gear is slipping.

Anyone know the costs and time it takes to repair such?


In Vancouver Canada?
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Unread 09-16-2006, 10:44 PM   #5
phasewolf
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In Michigan it cost me $1350 to have the trans rebuilt.
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Unread 09-16-2006, 10:55 PM   #6
JeepHunter89
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Do you have your overdrive on? Because mine goes from about 2000 to 3000 RPM's when I turn it on.
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Unread 09-17-2006, 03:52 AM   #7
schwa
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Quote:
Originally Posted by JeepHunter89
Do you have your overdrive on? Because mine goes from about 2000 to 3000 RPM's when I turn it on.

Overdrive is off, sometimes it will engage by itself and won't turn off when i push the button.
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Unread 09-17-2006, 09:48 AM   #8
eagleknight
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Quote:
Originally Posted by JeepHunter89
Do you have your overdrive on? Because mine goes from about 2000 to 3000 RPM's when I turn it on.
Quote:
Originally Posted by schwa
Overdrive is off, sometimes it will engage by itself and won't turn off when i push the button.
I think you have this backwards. With overdrive off you should be at around 3000rpms. You should have overdrive on for normal driving and that will have you around 2100rpms. Really the only time to turn it off is if your hauling a trailer. Even on the trail there is no reason to turn it off because you probaly won't be up in the higher gears anyway.

Now if it is on (which is default) and you hearing the engine going to up around 3000rpms. Then your transmission might be slipping or torque converter. I think I got that explained right.
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Unread 09-17-2006, 11:55 AM   #9
phasewolf
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If the light is off then the overdrive is on.
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Unread 09-17-2006, 05:15 PM   #10
JeepHunter89
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Yup, sorry. I just had a brainfart when posting.
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Unread 09-17-2006, 10:48 PM   #11
FlashLCD33
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Could it be a faulty overdrive switch kicking it on/off?
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