transmission
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transmission
Hi again. I have an 88 bronco II, 2.9L. I had the transmission rebuilt 3 years ago. I only have 19000 miles on the rebuild. I recently noticed these symptoms; if I step on the gas from the stop position and hold my foot down, it will not leave first gear. It seems like it will blow the engine before it will shift. However if I baby it, the shift occurs but its not a clean shift. Its drawn out, almost slipping. It also seems like it does not go into 5 gear on the highway, the engine remains at a high rpm. It also races up and down while driving at high speeds(55-65) almost like it settle on one gear. I have not had it serviced since I got the rebuild. Any thoughts are welcome. Thank you
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From: UT
I assume we're talking an auto transmission here?
1-2 and 2-3 shifts are controlled by the vacuum modulator. Could be a problem there.
3-4 shift and TCC lockup (I guess that's what you are refferring to when you say 5th gear. The A4LD is technically a 4 speed transmission with a locking torque converter). Are electronically controlled. If there is some problem with either or both of these (jumping in and out of 4th gear or constantly locking/unlocking the torque converter), 1st thing to check is the EEC-IV side of the shift controls (pull codes, check wiring).
All that said, probably the first thing to do (and this is true for just about any auto tranny problem) is to check the fluid level and condition.
1-2 and 2-3 shifts are controlled by the vacuum modulator. Could be a problem there.
3-4 shift and TCC lockup (I guess that's what you are refferring to when you say 5th gear. The A4LD is technically a 4 speed transmission with a locking torque converter). Are electronically controlled. If there is some problem with either or both of these (jumping in and out of 4th gear or constantly locking/unlocking the torque converter), 1st thing to check is the EEC-IV side of the shift controls (pull codes, check wiring).
All that said, probably the first thing to do (and this is true for just about any auto tranny problem) is to check the fluid level and condition.
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From: miami florida
sounds like you are leaking fluid. have you replace your trans filter and gasket
check your fluid level brownish looking not good , pinkish or reddish good.
if you need fluid might have to look for a leak somewhere.
check your fluid level brownish looking not good , pinkish or reddish good.
if you need fluid might have to look for a leak somewhere.
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transmission
Hello...changed the tranny filter, gasket. Gears 1-3 work, but 4 does not. When manually shifting from Drive to overdrive, there is no shift happening. Also, fluid is leaking from the shift rod/tranmission manual lever area where its attached to the body of the transmission. I will check the EEC-IV system next.
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transmission
I pulled the codes on the b2. Nothing. The b2 shifts perfectly in gears 1,2 and 3. It will not shift into overdrive. Anyone have any direction. Thank you.
Last edited by jakemahn; Mar 27, 2005 at 10:16 PM. Reason: incorrect sentence structure
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From: UT
Originally Posted by jakemahn
I pulled the codes on the b2. Nothing. The b2 shifts perfectly in gears 1,2 and 3. It will not shift into overdrive. Anyone have any direction. Thank you.
Did you check the TCC solenoid and 3-4 shift solenoid circuits?
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transmission
Thank you for hanging in there with me. So far I pulled the codes and all systems passed. I did not check the TCC solenoid and 3-4 shift solenoid circuits because I do not know what they are or how to go about it?
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From: UT
ATSG is a good manual, especially when you need to start pulling the transmission apart. For our purposes right now, all you need is a wiring diagram (Chiltons is adequate for this. see the vehicle repair guides at www.autozone.com if print manuals are too passe), a voltmeter, and a basic understanding of DC electricity. Using the output state EEC-IV test, determine if the computer "can" command the 3-4 shift and TCC lockup, then a road test to see if the computer "chooses" to command 3-4 shift and/or TCC lockup. If the computer can't command the shift, then there's a problem in that circuit. If the computer can, but chooses not to, then there's an EEC-IV sensor sending bad data to the computer. If the computer and chooses to command the shift, and the transmission doesn't respond, then there's a mechanical/hydraulic fault inside the transmission.
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Transmission
When you say chiltons manual, do you mean a bronco II manual? If so I have a Haynes 83-92 Ranger/BroncoII manual. Does this have the necessary wiring diagrams? Thank you
Last edited by jakemahn; Mar 29, 2005 at 07:31 PM. Reason: left some wording out
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From: UT
Wiring diagram in Haynes might work ,because, as I recall, their "sample" wiring diagram is from an '88. I don't like my Haynes manual for this reason: they give you one wiring diagram from one year 2.9 and say that other years are "similar." Chiltons gives wiring diagrams for each year.
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transmission
After a long while I am back.
This was a comment regarding tests for my tranny problem:
"Using the output state EEC-IV test, determine if the computer "can" command the 3-4 shift and TCC lockup, then a road test to see if the computer "chooses" to command 3-4 shift and/or TCC lockup. If the computer can't command the shift, then there's a problem in that circuit."
I am still not sure how to go about this. I ran the checks with a code scanner and all systems passed. I am not sure how to get the computer to command the 3-4 shift or the tcc lock-up in the driveway or on the road. Help
This was a comment regarding tests for my tranny problem:
"Using the output state EEC-IV test, determine if the computer "can" command the 3-4 shift and TCC lockup, then a road test to see if the computer "chooses" to command 3-4 shift and/or TCC lockup. If the computer can't command the shift, then there's a problem in that circuit."
I am still not sure how to go about this. I ran the checks with a code scanner and all systems passed. I am not sure how to get the computer to command the 3-4 shift or the tcc lock-up in the driveway or on the road. Help
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From: UT
1st. With the key on, do the solenoid have 12V power supplied? Wiring between transmission and computer intact?
2nd. Does Haynes properly describe the output state test? They may not. Look under output state test at www.dalidesign.com/hbook/eectest.html Hook up a voltmeter so it's measuring the voltage drop across the solenoid of interest (either 3-4 shift or TCC lockup), then enter the output state test. With each press of the throttle, you should be able to see the change in state for the solenoid (voltmeter will alternate from ~12 V to ~0 V). This tests if the computer can command the shift.
3rd With voltmeter still hooked up to measure voltage drop across the solenoid, road test the vehicle. When the computer chooses to command the shift, you should see the solenoid state change. If the solenoid never changes electrical state, then the computer isn't choosing to command the shift, and we search through the engine management system to find out why. If the computer does choose to command the shift, but the transmission doesn't respond, then the problem is inside the transmission (either hydraulic or mechanical).
2nd. Does Haynes properly describe the output state test? They may not. Look under output state test at www.dalidesign.com/hbook/eectest.html Hook up a voltmeter so it's measuring the voltage drop across the solenoid of interest (either 3-4 shift or TCC lockup), then enter the output state test. With each press of the throttle, you should be able to see the change in state for the solenoid (voltmeter will alternate from ~12 V to ~0 V). This tests if the computer can command the shift.
3rd With voltmeter still hooked up to measure voltage drop across the solenoid, road test the vehicle. When the computer chooses to command the shift, you should see the solenoid state change. If the solenoid never changes electrical state, then the computer isn't choosing to command the shift, and we search through the engine management system to find out why. If the computer does choose to command the shift, but the transmission doesn't respond, then the problem is inside the transmission (either hydraulic or mechanical).