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Possible transmission problem

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Old Jul 7, 2009 | 08:26 AM
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Default Possible transmission problem

Guys,

First of all, thanks for share your experience on our RX. Its been a great help understanding my 2000.

Here is the question, last night I noticed (while running on a highway with no hills) That my car at 55 MPH the RPM were at about 3500. I think its a little too high, my wife's Mitsubishi Endeavor at the same speed, the RPM are around 1600. The tranny button was off. (Power or Snow) The O/D was on, when turned off it didn't increase the RPM.

Any ideas?
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Old Jul 7, 2009 | 08:29 AM
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The rpms are too high. Do you have any check engine lights....?
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Old Jul 7, 2009 | 08:32 AM
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Code P0330 (Knock Sensor) takes the OD off by default.
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Old Jul 7, 2009 | 10:51 AM
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Originally Posted by Pescao
Guys,

First of all, thanks for share your experience on our RX. Its been a great help understanding my 2000.

Here is the question, last night I noticed (while running on a highway with no hills) That my car at 55 MPH the RPM were at about 3500. I think its a little too high, my wife's Mitsubishi Endeavor at the same speed, the RPM are around 1600. The tranny button was off. (Power or Snow) The O/D was on, when turned off it didn't increase the RPM.

Any ideas?
The fact that your RPMs don't increase when you turn off the O/D button pretty much tells you that you are not in O/D. You could also count the shift points to determine this. You should feel a 1st to 2nd shift somewhere around 20mph, a 2nd to 3rd somewhere around 35mph and finally a shift from 3rd to 4th(od) somewhere around 45mph.The most common cause is your check engine light is on for some other reason so the ECU is preventing the trans from going into O/D. If this is the case fix the CEL cause and you should be good. If CEL is not on problem sounds trans related or possible O/D switch. Does indicator on dash indicate switch is working?

Last edited by mikey00; Jul 7, 2009 at 10:55 AM.
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Old Jul 7, 2009 | 11:11 AM
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If i am correct,the torque converter doesnt lock in either when o/d is off.I tried driving with o/d off,and it really screams until you put it back on.
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Old Jul 7, 2009 | 12:21 PM
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Guys,

The CEL light came on last week, right after my daughter filled the fuel tank with 87 octane gas. I took it to Autozone, they scanned and said that the A/F is bad. (The one near the radiator)

I think its time to replace all the sensors, my car its around 125 k

Thanks for all your help
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Old Jul 7, 2009 | 12:28 PM
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At least that explains why your RPMs are so high.
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Old Jul 7, 2009 | 01:50 PM
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Make sure to use Denso only on the sensors, Anything other than OEM will cause you problems. Too many posts of people spending the money on the sensors and than having to replace them again to fix problem Here is a picture of the firewall one. Get us the codes:
Attached Thumbnails Possible transmission problem-bank1sensor1.jpg  
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Old Jul 7, 2009 | 05:50 PM
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Originally Posted by Pescao
Guys,

The CEL light came on last week, right after my daughter filled the fuel tank with 87 octane gas. I took it to Autozone, they scanned and said that the A/F is bad. (The one near the radiator)

I think its time to replace all the sensors, my car its around 125 k

Thanks for all your help
See, you left out the MOST IMPORTANT thing on your thread, that you had a CEL. That explains all...

I had my rear by cat. replaced at around 110K.
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Old Jul 8, 2009 | 04:01 AM
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Guys,

You were all right. I disconnect the battery, replace the A/F sensor and now its running very smooth, 55 MPH at 2000 RPM.

Thanks for all your replies.
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