On n off shutter, no shift into overdrive - TCCoA Forums
 
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post #1 of 22 (permalink) Old 10-31-2012, 06:21 PM Thread Starter
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Exclamation On n off shutter, no shift into overdrive

ok so heres my newest problem. driving on the highway about 3 days ago, no problem was nice and in overdrive, engine light came on and seemed to not be in overdrive. drove it today on the highway and definitly not into overdrive..i can feel it trying to shift into OD but it just wont go. Checked the fluid warm and it seemed ok. i alreayd had plans to get mercon V and new filter from the dealership in a week or 2. was wondering if you guys had any recomendations to check..going to get the check engine light checked tomo n see what it says..would a speed sensor be possibly bad? also it shutters slighty in diff gears but once off then back on the gas it goes away...should i start saving for a rebuild...look for a new/used tranny...or anything you guys nee me to get more info about let me know. 96 4.6 aod 112k miles...i really wish the person before me had taken care of this car im bringing it back from life support it seems...brakes, electrical, suspension (btw rockauto is amazing!!) i have no doubts you guys will steer me right!

-Harrison
1996 Blue 4.6 ThunderBird
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post #2 of 22 (permalink) Old 10-31-2012, 07:07 PM
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I had the same issue with mine, fluid and filter change took care of the shudder. Changing the MLPS took care of the shifting issue.
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post #3 of 22 (permalink) Old 10-31-2012, 07:35 PM Thread Starter
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Mlps ? My cars automatic.

-Harrison
1996 Blue 4.6 ThunderBird
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post #4 of 22 (permalink) Old 10-31-2012, 07:49 PM
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Mlps is also known as the neutral safety switch.
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post #5 of 22 (permalink) Old 10-31-2012, 08:28 PM Thread Starter
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Idk. What would the nuetral saftey switch have to so with it ?

-Harrison
1996 Blue 4.6 ThunderBird
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post #6 of 22 (permalink) Old 10-31-2012, 10:32 PM
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Idk. What would the nuetral saftey switch have to so with it ?
The MLPS ( MLPS = Manual Lever Position Sensor , from http://forums.tccoa.com/showthread.php?t=124074 ) tells the ECU what position the gearshift is in.

*dry* This is used at least partly as the Neutral Safety Switch, so you don't start the car up in gear while you're underneath it.

It's also the Backup Light Switch.

AND - it tells the ECU that you're in D/OD and not 2nd or 1st.

RwP
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post #7 of 22 (permalink) Old 11-01-2012, 03:44 AM Thread Starter
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Sooooo how do I diagnose n try to fix my problem ?

-Harrison
1996 Blue 4.6 ThunderBird
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post #8 of 22 (permalink) Old 11-01-2012, 08:56 AM
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Sooooo how do I diagnose n try to fix my problem ?
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Originally Posted by v8nick View Post
I had the same issue with mine, fluid and filter change took care of the shudder. Changing the MLPS took care of the shifting issue.
I think V8Nick answered that question.

A filter and full fluid change with Mercon V first, and then if necessary, adjust and then replace the MLPS.

If that doesn't fix it, find a later model 4R70W and refresh it, then swap trannies. While doing that, evaluate what you want for the car, and possibly replace with a higher stall torque converter.

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post #9 of 22 (permalink) Old 11-01-2012, 11:21 AM
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Had the dealer do my MerconV and filter yesterday and it solved my low speed shudder when shifting from first to second or second to third, just like the shop manual said it would. Got the car this spring with 50000 miles on it, and I am sure that was the original 19 year old fluid. As a side note, last week, one of my original 19 year old tires blew out when making a turn in town, foprtunately not when on the highway. There was still plenty of tread left so I admittedly pushed my luck there. So now, new top end Michelins and new tranny fluid and the Cougar is happier. Like oil changes I decided to let the dealer do the fluid flush and change, as the labor was not all that much more than the fluid and filter costs. And since I don't have a tire buster and balancer in my garage same goes for the tires. It's okay to pamper yourself sometimes. Anyway, today I will at least install my own rear shocks myself, which will be ridiculously easy to do.
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post #10 of 22 (permalink) Old 11-01-2012, 04:00 PM Thread Starter
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How much was the fluid n filter at the dealership. Jw. Have yet to call mine

-Harrison
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post #11 of 22 (permalink) Old 11-01-2012, 04:59 PM
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I did mine myself. Fluid and filter was just under $100. Mlps at autozone was $45 I think.
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post #12 of 22 (permalink) Old 11-01-2012, 08:58 PM Thread Starter
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I live on apt. An pissibly do at my gramas. Noob question. Where is the mlps. how do I check it ?

-Harrison
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post #13 of 22 (permalink) Old 11-01-2012, 09:51 PM
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Its on the side of the transmission. I don't know of a way to check it. I can only tell you what was going on with my car. My transmission would just randomly shift out of overdrive. Sometimes it wouldnt shift into overdrive at all. And that was after i changed the filter and fluid. I then changed the mlps, which I was advised to do by other members on this site, and the problem was cured.
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post #14 of 22 (permalink) Old 11-01-2012, 10:40 PM Thread Starter
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Sounds like what's mine doing. Did you have shutter every now and then ?

-Harrison
1996 Blue 4.6 ThunderBird
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post #15 of 22 (permalink) Old 11-01-2012, 11:38 PM
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How much was the fluid n filter at the dealership. Jw. Have yet to call mine
Type FK251 filter: $26.21; 12 quarts Mercon 5: $4.65 a quart; labor: $149.96; also one quart it looks like of some special fluid called JB111: $27.98; but I also had a coupon from the dealer worth $52.00 so with $8.02 tax the total net was $215.98
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post #16 of 22 (permalink) Old 11-02-2012, 01:43 AM Thread Starter
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Now did that just do a filter and flush. Or did they drain the torque convertor also. For 220 ill sacrfice a day and so it in a driveway.

-Harrison
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post #17 of 22 (permalink) Old 11-02-2012, 07:14 AM Thread Starter
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Also how do i adjust the mlps. I've been looking online for an hour and can't find a dwcent answer. And please explain it like I'm 3 so I have zero doubts

-Harrison
1996 Blue 4.6 ThunderBird
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post #18 of 22 (permalink) Old 11-02-2012, 07:33 AM
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Now did that just do a filter and flush. Or did they drain the torque convertor also. For 220 ill sacrfice a day and so it in a driveway.
Good luck. Go for it.
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post #19 of 22 (permalink) Old 11-02-2012, 08:23 AM
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Also how do i adjust the mlps. I've been looking online for an hour and can't find a dwcent answer. And please explain it like I'm 3 so I have zero doubts
Jack the back end of the car up and put the wheels up in the air (so that you don't have to worry about it rolling).

Put the car in reverse (Motor NOT running!)

Have someone stand behind the car and let you know about the backup lights. As you adjust it, they should go on and off. For a 'laying on the ground underneath' adjustment, center it from the two sides that they turn off from (in the center of the on area).

For a slightly better adjustment, with the foot on the brake (and the car in the air!) have them try to start it in PARK and NEUTRAL both. This may work better if you pull the ECC fuse so it WON'T start, but will crank.

Or there's the service manual way, but it requires a specific tool from Ford.

For the service manual way, someone may pipe in with the exact size of the tool and the instructions for that.

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post #20 of 22 (permalink) Old 11-02-2012, 08:31 AM Thread Starter
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Ok. Key on when adjusting? And also what an I adjusting anyways. I cant pictuew it in my head. Where the rod bolts on ? The sensor itself?

-Harrison
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post #21 of 22 (permalink) Old 11-02-2012, 04:06 PM
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You adjust he sensor. The bolt holes are slotted so you can slide forward or back to get it into the correct position.
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post #22 of 22 (permalink) Old 11-02-2012, 06:14 PM Thread Starter
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Ok good deal that's what I was trying to figure out!!

-Harrison
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