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Old 02-25-2007, 05:01 PM
srburton srburton is offline
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Losing Transmission fluid,no sign of a leak!

Mystery loss of transmission fluid,i noticed it was low and added 1 pint after just a few miles it was a quart low.

Is this a modulator problem/ vacuum ?

I am at a loss anytone got any ideas where the fluid is going?

It is a 1990 4-Runner v6 automatic 4 wh drive.

Thanks for any ideas.

Last edited by srburton; 02-25-2007 at 05:03 PM.
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Old 02-25-2007, 05:11 PM
dougbfresh dougbfresh is offline
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Are you puffing large clouds of smoke?
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Old 02-25-2007, 05:46 PM
srburton srburton is offline
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No smoke,maybe a little at startup first thing in am.

Just the normal white smoke when it is chilly out.
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Old 02-25-2007, 05:51 PM
dougbfresh dougbfresh is offline
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If it was the modulator, the trans fluid would be pulled in an burned-bug plumes of smoke would happen.
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Old 02-25-2007, 06:07 PM
srburton srburton is offline
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OK,maybe i did not check it properly the first time.
I ran it til it was warm and checked it in park.
There is a cold mark and a hot mark on the dipstick.
It reads higher when hot doesn't it.
Am i checking it properly? maybe it was not the same conditions.
I will check it again after a short drive.

Thanks Doug for the input.
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Old 02-25-2007, 06:40 PM
dougbfresh dougbfresh is offline
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Should say on the stick to check it in park/warm, if not check the owners manual if you still have it.
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Old 02-25-2007, 06:52 PM
m1k3sthemannn m1k3sthemannn is offline
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Quote:
Originally Posted by srburton
OK,maybe i did not check it properly the first time.
I ran it til it was warm and checked it in park.
There is a cold mark and a hot mark on the dipstick.
It reads higher when hot doesn't it.
Am i checking it properly? maybe it was not the same conditions.
I will check it again after a short drive.

Thanks Doug for the input.
I'll second checking the manual. Most automatic transmissions are preferably tested warm, and after manually running the gearshift through all gears, then back to park.

There is typically a warm/cold test mark, but again, most owners manuals I've read suggest warm tests. Cold mark is good for things like after changing fluid and unknown quantity of fluid lost, so you don't start the transmission up dangerously low on fluid.
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Old 03-18-2007, 01:39 PM
ldadel ldadel is offline
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Just changed a vacuum modulator valve in the boys '88 F-150 (390,000 miles). It smoked very little just sometimes. We pulled the hose off and fluid dripped out. tested the valve and it was at fault. New one in, all is well.
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Old 03-18-2007, 07:44 PM
olddog olddog is offline
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FYI - transmition fluid does produce white smoke when burned in the engine.

If this transmition has a vacuum line hooked to it, pull the hose and see if it has fluid in it. I once owned a 4-runner and it had an all electric controlled transmition in it. I doubt that such a trany would have vacuum hooked to it.
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Old 03-19-2007, 12:35 AM
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justen justen is offline
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If you have lines running to the radiator from the tranny, make sure it don't leak up there. Alot of people wonder where the fluid is leaking, because theres no puddles under the tranny.
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