Overdrive light flashing, hard shifts??? - Diesel Forum - TheDieselStop.com
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Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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Old 07-07-2010, 01:27 PM   #1 (permalink)
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Overdrive light flashing, hard shifts???

My overdrive light flashes constantly and the shifts from 1-2 and 2-3 shift hard.. Also the downshift is pretty hard when im rolling to a light.. Does anyone know what could be going on??? I appreciate anyone's input..
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Old 07-07-2010, 03:04 PM   #2 (permalink)
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You need to scan it for codes before you blow it up.... It could be a VSS also.. If the code is a PO500 then it might be the VSS in the pumpkin OR the Wiring to the VSS. Scan it ASAP...
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Old 07-07-2010, 05:38 PM   #3 (permalink)
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There are about 50 things that it could be. Reading the codes is the best way to start. Don't go to somewhere that reads them free. You get what you pay for.
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Old 07-07-2010, 09:09 PM   #4 (permalink)
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Echo above. If you don't get it looked at, the tranny is going to be a rebuild no later than a few months at 3K on up. Stop driving it now except to a shop. It may just be a sensor or something simple. If you have a FIPL, check your electrical connection to it. You will find this connection on the front of the motor if you have it.
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Old 07-08-2010, 10:21 PM   #5 (permalink)
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Disconnect both batteries for five minutes and then start it up and see what it does. With mine if I click the button to "Off" after doing this before I start to drive it it shifts properly. I click it to "off" and then put it in gear. It works perfect but no overdrive. If I don't do this it starts to flash and goes into emergency mode like yours is doing. The VSS can do this as well as the connection to the VSS but this is a good place to start with the unhooking the batteries and then clicking it to "off". You can try it not on off first if you want and then do it again with "off" if it does it again. Nobody else will tell you this.
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Old 07-09-2010, 05:55 AM   #6 (permalink)
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if the dome lite is out, replace the fuse, this will cause in transmission to go into the limp home mode

this may be the cheap problem sover

good luck
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Old 07-09-2010, 01:23 PM   #7 (permalink)
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Quote:
Originally Posted by edieedie View Post
if the dome lite is out, replace the fuse, this will cause in transmission to go into the limp home mode

this may be the cheap problem sover

good luck
That's important stuff edieedie, everybody needs to know these kind of things instead of just go to the shop and spend a bunch of hundreds or thousands of dollars getting codes and whatnot. Square one should be what you and I are saying. I wonder how many trucks went down because nobody knows these things and can't afford the huge repair bills that might not have been necessary.
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Old 07-09-2010, 09:46 PM   #8 (permalink)
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Quote:
Originally Posted by midwestconnection View Post
With mine if I click the button to "Off" after doing this before I start to drive it it shifts properly. I click it to "off" and then put it in gear. It works perfect but no overdrive. If I don't do this it starts to flash and goes into emergency mode like yours is doing.
That tells me that you most likely have a problem with the torque converter clutch. The PCM for the E4OD could only check the torque converter clutch for slippage when it was in OD. If you turn the OD off each time it will never check and won't send the trans into failure mode.

On the other had you have not fixed the slipping torque converter clutch. That will come back to bite you down the road.

There is a quick visual way to tell if it is slipping. Remove the torque converter cover plate on the bottom front of the trans and look at the front face of the torque converter. If it shows blueing on the steel it's from the heat of a slipping torque converter clutch. It doesn't have to slip enough that the driver will notice it to turn the torque converter blue and set a code.
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Old 07-09-2010, 10:58 PM   #9 (permalink)
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Originally Posted by Mark Kovalsky View Post
That tells me that you most likely have a problem with the torque converter clutch. The PCM for the E4OD could only check the torque converter clutch for slippage when it was in OD. If you turn the OD off each time it will never check and won't send the trans into failure mode.

On the other had you have not fixed the slipping torque converter clutch. That will come back to bite you down the road.

There is a quick visual way to tell if it is slipping. Remove the torque converter cover plate on the bottom front of the trans and look at the front face of the torque converter. If it shows blueing on the steel it's from the heat of a slipping torque converter clutch. It doesn't have to slip enough that the driver will notice it to turn the torque converter blue and set a code.
Thanks, I'll take a look at that. -- I think it's a false signal problem in the wiring or sensor's and computer myself. My situation allows me to stay in 1, 2 , 3 just as if I was pulling really heavy and needed to stay out of overdrive because of the excessive weight. I lose a little fuel economy but I get some of that back driving a little slower. If what you are saying isn't occurring I expect to get years and years of service out of this transmission. As you know, I'm a believer in staying away from overdrive in older transmissions in the first place. Even without problems, actually as a way to prevent problems and prolong the life of the transmission. I know you disagree with this but I know for a fact that a lot of E40D transmissions would go a few more hundred thousand miles by simply staying out of overdrive. That's a major "do" for a lot of these older trucks that are not worth putting thousands of dollars into transmission work. We got to junk them or walk away. I'll stay out of overdrive.
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Old 08-05-2010, 07:53 PM   #10 (permalink)
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1994 idi turbo, flashing overdrive

Hello
I have a 1994 f350 idi turbo that is flashing an slipping, hard shifting, I turn off , restart and it drives normal, I do notice a whirling sound but no rpm increase, right before the tranny starts acting up and light starts flashing. please give advice, I went to tranny shop, guy pulled pan didnt change fluid ,he said new fluid would cause it grip nore and cause more damage, is he right?
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Old 08-05-2010, 09:47 PM   #11 (permalink)
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No, he isn't right, but I doubt that new fluid is going to save it at this point.

At the least you probably need a new torque converter. The pre-'95 converters had a nasty cracking problem in the torque converter clutch apply piston. This causes leakage that will allow the converter clutch to slip. The PCM can see this, and then sets a code and sets the pressures high.

You can verify this by removing the inspection cover from the front bottom of the trans. Look at the front of the torque converter. If the cover is discolored, the clutch has been slipping. Usually they turn blue from the heat generated by the slipping going on.
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Old 08-05-2010, 09:58 PM   #12 (permalink)
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1994 e4od flashing od light and whirling noise

Mark
I was looking forward to your reply as most are on this topic, Same shop gave me a rebuild price of 1400.00, should I ask if this includes torque convertor?
Would a fluid change give me any more time, i dont drive it much and never pull or tow or drive in 4x 4 but do drive in stop n go.
Thanks again, mike in houston tx
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Old 08-05-2010, 10:01 PM   #13 (permalink)
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tranny fluid change

Mark
if I change fluid do I use gasket or silicone? My fluid dip stick is very bent and may read low fluid . is their an alternate way to read fluid level?
Thanks again mike
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Old 08-06-2010, 02:00 AM   #14 (permalink)
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You should always ask what any price includes.

I doubt that new fluid will buy you any time. I think it's cracked. If the pan has a rubber gasket reuse it. If it's cork, then get a rubber gasket. You can use a cork one, but they usually leak. I would not use silicone.

I don't know of any way to measure the fluid level other than a good dipstick. Get another dipstick.
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Old 08-06-2010, 12:19 PM   #15 (permalink)
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It appears that my transmission was doing the same thing yours is simply because I was slightly over full. My dipstick showed at the top of the white indicator and maybe a quarter inch to half inch above. Not much. I drained a little over a quart and got it to just below the zero or letter O of HOT. nothing on the O and it now works perfect I think. It was forcing it into emergency mode. That O in the word HOT is the best indicator there is. You can tell plainly if it is below it because the O holds fluid in it's center so well if it's at or above this O. Mine is now just below the O and works perfect. Transmission people listen up, this is an important distinction.
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Last edited by midwestconnection; 08-06-2010 at 12:22 PM.
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