Focus Fanatics Forum banner

1 - 20 of 33 Posts

·
Registered
Joined
·
19 Posts
Discussion Starter #1
So for about the last 2 weeks I've been noticing a delayed downshift out of overdrive into passing gear when driving at highway speeds. It seems to be less of a problem at 45-50 mph because I am not on the throttle near as much. Seems to slip into neutral for a split second and then slam into 3rd. The upshift are fine just the downshift from 4th to 3rd gear. The trans fluid was flushed at 60, 130k, and at 190k I just dropped the pan and checked all the resistance readings on all six solenoids and they are all within spec. So I changed the filter and dropped the pan twice to replace the majority of the old trans fluid with new mercon V. The old fluid was red and didn't smell burnt and there was very little filings on the magnet in the pan. I drove 500 miles yesterday and it drove fine other than the 4-3 downshift. No CEL or codes either I'm stumped???

Sent from my SAMSUNG-SM-N910A using Tapatalk
 

·
Super Moderator
Joined
·
8,951 Posts
Moved to general technical chat for more views and better answers.

Sent from my ASUS_Z00AD using Tapatalk
 

·
Registered
Joined
·
16,335 Posts
Stumped???

Never heard of transmission wear huh? They DO wear out.

The problem with today, everybody thinks solenoids fix everything.

Can be wear issues with band, servo or possible forward clutch.
 

·
Registered
Joined
·
19 Posts
Discussion Starter #5
I've never had a anything that didn't start slipping when the trans wore out. It's not slipping it's acting like it's not sure what gear it's in coming out of overdrive.

Sent from my SAMSUNG-SM-N910A using Tapatalk
 

·
Registered
Joined
·
19 Posts
Discussion Starter #6
I had an Escort that had 220k on it that they said needed rebuilt, because every once in awhile it wouldn't go in gear. And it ended up being low line pressure, I turned the line pressure up to spec and put another 20k on it before I sold it.

Sent from my SAMSUNG-SM-N910A using Tapatalk
 

·
Registered
Joined
·
104 Posts
Yeah the auto will be a ***** sometimes when I let off the gas trying to get it downshift it'll hang up for a second
It does one of those things where you hit the gas and its maybe in 2nd or 3rd gear but it takes a second before it kicks in its probably just wear.
 

·
Registered
Joined
·
19 Posts
Discussion Starter #8
I just thought if it was something that could be fixed for a couple hundred bucks and not have to pull the trans I'd check into it. But I'm only looking to get another 1-2 years out of it so I guess I'll just drive it till it breaks for good. It just seems weird that if it's wear then why isn't it getting worse it's been acting up for the last 4-5k miles.

Sent from my SAMSUNG-SM-N910A using Tapatalk
 

·
Registered
Joined
·
16,335 Posts
Sometimes they take a year or two to wear more to change the effect.

I'm curious as to exactly what you 'turned up' to get more line pressure. The problem being if you do it for a single hydro issue then it will be too high for other normally working parts and can easily damage trans. Unless the issue was pump itself.

This..............

'Seems to slip into neutral for a split second...'

is slip whether you realize it or not. Just for a fractional second. Momentary slip like that can go for a while but once it increases in amount the trans gets much closer to the end.

Any trouble at all going from 3 into 4 under a hard load? ANY shift requires both gears to release or engage in a certain time to occur correctly. If you are getting a bit of flareup going 3-4 then could be as simple as a longer band bolt to tighten it up a bit. Band being slightly loose can release slightly early to slip just before third clutch pack locks up on a 4-3 shift. Or the third clutch pack leaking slightly to delay it too if no issues going 3-4. The slip can come from either way being errored.
 

·
Registered
Joined
·
16,335 Posts
The servo piston pin comes loose on these to make any number of shift errors from 2-3-4. Not that hard to get to it.
 

·
Registered
Joined
·
19 Posts
Discussion Starter #11
It was a 95 Escort and there was a line pressure test port on the side if the trans that I screwed a pressure gauge into and the spec was like 50-60 psi at idle with the car in drive and I had like 25 psi, there was adjustment on the TV cable near the throttle body that adjusted the line pressure. Apparently when I changed the cylinder head because it dropped a valve seat I must have bumped it and the line pressure changed.

Sent from my SAMSUNG-SM-N910A using Tapatalk
 

·
Registered
Joined
·
19 Posts
Discussion Starter #12
Does the transmission have to come out to get to this pin?

Sent from my SAMSUNG-SM-N910A using Tapatalk
 

·
Registered
Joined
·
16,335 Posts
No, the VB does and thinking the manual control shaft that shifts it, a pin comes out to free it. VB has two seals on top that can get lost removing it. Servo piston is under the 3 bolt triangle shaped cover. It works the 2-4 band. A couple of accumulator pistons and springs come out with VB too, don't mix them up.

Adjusting TV is NOT how you adjust line pressure, that adjustment is for under load only and certainly not idle. By pushing up idle you made max load go WAY up and that alone could be why trans later failed. You adjust line by the main regulator on the VB........throttle valve (TV) and line are totally different things with different effects. There is a certain mechanical setting for manual TV on those, you do what it takes to adjust it to spec since it not only changes line but every operating pressure at every setting. You messed with far more than simple line pressure there.
 

·
Registered
Joined
·
19 Posts
Discussion Starter #14
Ive never removed a valve body and taking it apart and losing parts doesnt sound to good, but I might check into doing it. The trans didn't fail later, maybe I didn't turn up line pressure but I was pretty sure it was the line pressure test port I screwed the gauge into.

Sent from my SAMSUNG-SM-N910A using Tapatalk
 

·
Registered
Joined
·
16,335 Posts
Whatever. I got nothing against fixing slipping gears with as little as a thirty cent washer having done it myself but one should at least try to learn what they are changing when they do it.

Line is basic pressure, all others then build on that by modifying it as needed. 20 different ways to do that with an ATX. Many will destroy things done wrong.
 

·
Registered
Joined
·
19 Posts
Discussion Starter #16
It just seems weird that I can cancel overdrive and force it to downshift and it goes right in with no delay, and still the fact that there is no delay on the upshift.

Sent from my SAMSUNG-SM-N910A using Tapatalk
 

·
Registered
Joined
·
19 Posts
Discussion Starter #17
I'm thinking maybe it's a torque converter unlocking issue

Sent from my SAMSUNG-SM-N910A using Tapatalk
 

·
Registered
Joined
·
16,335 Posts
Nope, you'll get TCC codes pretty much before anything that bad happens. As well, if you pay attention, you can feel TCC unlocking/locking with even the slightest throttle increase/decrease. Either not locked when should be or the other way TCC won't flareup anyway. Both clutch AND convertor OWC have to be broke to do that and rare.
 

·
Registered
Joined
·
19 Posts
Discussion Starter #19
Still driving with 198k on the clock now. I'm still thinking it's a torque converter lockup issue. If I'm driving steady at 45 mph and hit a steep hill it will slip and then lockup and then downshift to third, then when I'm over hill it only upshifts once. It has done it like clockwork on the same hill almost everyday. But if I turn overdrive off as the rpm's drop it downshifts right to third with nothing odd happening.

Sent from my SAMSUNG-SM-N910A using Tapatalk
 

·
Registered
Joined
·
16,335 Posts
Uh, the convertor clutch is used in 3rd too, the same hill would have it doing it in 3rd...........
 
1 - 20 of 33 Posts
Top