Transmission Woes......

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  #1  
Old 05-15-09, 05:27 PM
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Transmission Woes......

Yep, it's my '01 Malibu again. (217,000 miles)
My tansmission loses it's passing gear about the same time the engine starts ilding high about 3,500 rpms.
The symptoms seem to be related.
Is their some kind of sensor on the transmission or something.

Please help....................
 
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  #2  
Old 05-15-09, 05:37 PM
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The idling issue might be from a faulty idle air control valve (IAC). Any codes? Locked torque converter?
 
  #3  
Old 05-15-09, 05:58 PM
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Originally Posted by HotinOKC View Post
The idling issue might be from a faulty idle air control valve (IAC). Any codes? Locked torque converter?
Nope.....no codes and I allready replaced the idle air control.
 
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Old 05-16-09, 05:28 AM
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TPS maybe? Computer having hard time deciding what position the throttle is in.
 
  #5  
Old 05-16-09, 08:27 AM
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Next time it does it I need to get out and check to see if the throttle is actually advanced..........if it works that way.
But I still wonder why I lose my passing gear but it always comes back after a short while later.
 
  #6  
Old 05-16-09, 09:48 AM
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No, you won't see anything; just electrons running around in the wiring. If the computer doesn't get the proper signal from the TPS that you have the pedal to the metal it could prevent the tranny from kicking down. Ditto a bad signal could conveivably cause the high idling (computer can't figure out where the throttle is).

No codes you said?

Hoping one of the real mechanics will jump in here and either confirm my thoughts or tell me I'm FOS.
 
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Old 05-16-09, 10:02 AM
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It could be in a shift module. But to muddy the water I was working on a Geo with erratic shifting, then the rpms went high, then quit altogether. Let it cool, restarted it, then it died again - no restart.

No codes - the primary coil checked OK resistance-wise and no one could check the ignition module (in this case the igniter=$345.00). The primary coil was bad and causing all this.

What does FOS mean?
 
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Old 05-16-09, 10:07 AM
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Full Of Stuff...or something similar
 
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Old 05-16-09, 01:10 PM
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Oh, I thought it had something to do with Florida
 
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Old 05-16-09, 05:05 PM
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Well, it's a highly technical term that Iowans wouldn't understand.
 
  #11  
Old 05-16-09, 08:16 PM
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Yeah, anything above a plain hammer, we're over at the Wikipedia site.
 
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Old 05-17-09, 08:46 AM
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Are plain hammers only sold in the Midwest? At home I have a framing hammer, a claw hammer, a ball peen hammer,so on and so forth/
 
  #13  
Old 05-17-09, 10:09 AM
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Originally Posted by marbobj View Post
It could be in a shift module. But to muddy the water I was working on a Geo with erratic shifting, then the rpms went high, then quit altogether. Let it cool, restarted it, then it died again - no restart.

No codes - the primary coil checked OK resistance-wise and no one could check the ignition module (in this case the igniter=$345.00). The primary coil was bad and causing all this.

What does FOS mean?

marbobj and TG you shead some interesting light on this.

Is there a site that would list TSB's that is available to the public?
 
  #14  
Old 05-17-09, 10:22 AM
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Originally Posted by the_tow_guy View Post
No, you won't see anything; just electrons running around in the wiring. If the computer doesn't get the proper signal from the TPS that you have the pedal to the metal it could prevent the tranny from kicking down. Ditto a bad signal could conveivably cause the high idling (computer can't figure out where the throttle is).

No codes you said?

Hoping one of the real mechanics will jump in here and either confirm my thoughts or tell me I'm FOS.
I say no codes.......but what I'm saying is no dashlight warnings or check engine lights. Could there be silent codes that can be read by a handheld scanner?

What's weird is I'm cruising down the expressway at 70mph and discover that the car is going by itself I pop it into nuetral, turn off the ignition and while coasting cycle the ingintion key several times then restart, it resets the idle (most times) sometimes it restarts at even higher rpms.
The worst case scenario is while crawling through traffic at 10mph and suddenly kicks up to 3,500 rpms.....it gets dicey.
 
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Old 05-17-09, 11:43 AM
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  #16  
Old 05-18-09, 04:50 AM
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Don't know about your OBDII , but my '94 Chevy wrecker (OBDI) will set tranny codes without lighting the CEL.

Given the nature of the problem, I would be getting it fixed in one big hurry.

BTW, just noticed; you do a LOT of driving (almost as much as me ).
 
  #17  
Old 05-27-09, 05:53 PM
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I may have found the problem or fix for this condition.
I think it has to do with the trans overheating due to clogged or limited airflow across the bottom of my radiator.
Last night I cleaned the grill of my condensor and radiator of bugs, stones, and dirt with high pressure air, water and a wire brush.

Today I logged in a whopping 225 miles and it didnt do it once.
No tranny slippage and no racing idle.

The verdict is still out on this one for now.
I'll have to see how it performs over the next few weeks.

TG....As a senior copier tech I'm constantly on the road and can easily log upto 1,500 miles in a week but that's the high side. I average 100 miles a day. I'm like the "Dirty Harry" of the service department. I get the stuff nobody can fix or just doesn't want to do but the challenge is what makes the job interesting.
 
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Old 05-28-09, 05:19 AM
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Interesting.
 
  #19  
Old 05-30-09, 04:06 PM
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If the tranny is or was over heating you need to:
-Change fluid and flush
-New Filter if applicable
The fluid condition is critical to the life of the trans. Also, add 1/2 of one bottle of Lucas Trans. It works great.
I'd install an external cooler as well.
 
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