Does the MLPS control converter lockup?

J

J

OCCUPY LoD :)
I left work this evening, all was well but when I jumped on the freeway I noticed the converter wasn't locking up. Normally it's quick to lockup and bog down so it was already obvious but I could stab the throttle and it would rev up.

I tried hitting the OD button and that didn't do anything with the lockup. Lastly, I put it in neutral (still at 70), revved it, waited and then put it back in drive. It shifted through the gears and into lockup as normal. No more issues the rest of the 45 mile drive.

So....maybe I didn't shift into drive hard enough to get the contacts on the MLPS to meet?
 
KStromberg

KStromberg

Vortech kicked in yo
I know my car won't fully lock the converter until the transmission is warmed up. I heard the 4r70ws are like that by nature, but I'm sure you of all people knew about that already. You must have something else going on. Which car is this and do you have gears in it?
 
driller

driller

El Presidente
Even though you are talking about Gen2s, I do not think the MLPS has anything to do with lockup.
 
J

J

OCCUPY LoD :)
Oops...this is in the Evergreen. It was pretty cold but it's never done this before. If it was heat related, why would shifting it into N and back into D change it?
 
M

Meister

New member
...my Mark has never done that, but my SHO does. It won't lock up until the tranny temp is up. It is factory programming....for some Ford vehicles.

Doug
 
SCTBIRD1173

SCTBIRD1173

Mark my Bird!
ghost2 said:
What exactly is "Lockup" and how do you identify "Lockup"?
Click to expand...
The torque convertor locks so it's a mechanical connection to the engine (like a clutch) instead of it's usual fluid connection. This is done for gas mileage mainly.

You can tell when the convertor locks when the RPMs drop around 200 or so during a steady cruise.

I'm a stick guy though and I'm sure someone else here could explain it better if necessary. ;)
 
chadly

chadly

New member
No thats pretty much right on.
If your cruising down the road above 40-45, if you tap the brakes just hard enough to turn on the brake lights, your RPM's will raise about 200 as the TC unlocks, then will go back down when it locks again.

My 97 does the same thing, wont lock up until it reaches a certain temp.
 
J

J

OCCUPY LoD :)
Hmmm...so you guys think it was "that" cold over here?

Ghost....if you can give the car some throttle and the RPMs will go up the converter is NOT "locked", if you give it throttle and the RPMs won't move but the car slightly accelerated, the converter IS "locked". Here is an exaggerated example. When my RPMs drop, that's when you can visibly see the converter going into lock up.

At 28 seconds it shifts and goes into lock up as you can see on the RPMs and at 118ish it does the same. It looks and feels like it shifts into another gear.
http://s111.photobucket.com/albums/n154/JesterLM/Mark8Junk/?action=view&current=MOV00437.mp4
 
K

kjm42

New member
the mlps does control lock up when mine was going bad it wouldnt lock up anymore i scanned the codes and and had a faulty mlps code it was also shifting very late i changed the mlps and everything went back to normal the mlps tells your computer what gear you are in so if it is starting to go bad all sorts of wierd stuff happens
 
J

J

OCCUPY LoD :)
I think it's a bad MLPS or just "in" adjustment. Did it again on Saturday, although the car was warmed up for 15 minutes before I drove it. Probably not engaging the shifter hard enough and therefore just missing the fully engaged signal to the computer?
 
B

billcu

Head Moderator
How does the shifter cable feel?

I had one (maybe 2 now) that had the plastic rubbed off, under the car, and caused the cable to corrode and it was hard to shift. That might cause the shifter to not be exactly where it should be?

I'd try adjusting the mlps first.
 
J

J

OCCUPY LoD :)
It feels okay I guess....maybe an inspection would help. If I fix it can it still be a beater car though?
 
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