Rpm Surge/trans Slip? - Taurus Car Club of America : Ford Taurus Forum
Reply
 
LinkBack Thread Tools
post #1 of 12 (permalink) Old 04-11-2005, 05:11 PM Thread Starter
Junior Member
 
Join Date: Feb 2005
Location: Dover DE
Posts: 71
Rep Power: 0
 
Trader Score: 0 reviews
ok, heres another really weird one. got this surge while cruising, rpm's will noticably surge 200-300 on the tach, and i can feel it in the car. not sure if its in the tranny. also, on medium to hard acceleration, she will surge and then smooth out and when it smooths out, its like this sudden burst of power. either something in the tranny is slipping, (bad press solenoid?/clutches?), or maybe a worn timing chain? this is evident in all gears also, and when parked on an incline the tranny grumbles a bit. i got on it from a stop today, and all the shifts were firm and right on, but its like she wasnt pulling as hard as she could(surging)until 4000 rpms. then she wound up quick and painless. it idles like a champ except for a noticable popping sound from the intake and it doesnt seem to be missing. fresh plugs, wires,fuel filter, fuel press regulator and coil pack so who knows. why does my car have the weird problems?

97 Taurus GL 'THE WILLOW GREEN STREET MACHINE' 3.0 OHV, AX4N Trans, Mods.-air intake silencer removed, Cyber White foglamps, Black Fuzzy Dice on the rear view mirror. Future Mods/Projects-home brew intake, CD player,SHO spoiler. 155,000 miles and counting.......
T@urus3.0 is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 04-11-2005, 05:13 PM
Crazy Devoted Member
 
shoz123's Avatar
 
Join Date: Nov 2002
Location: Ashkum, Illinois
Posts: 14,122
Rep Power: 56
 
Trader Score: 4 reviews
That is the TC locking and unlocking.

Paul Nimz
'10 Red Genesis Coupe
'08 Hyundai Accent
shoz123 is offline  
post #3 of 12 (permalink) Old 04-11-2005, 05:43 PM Thread Starter
Junior Member
 
Join Date: Feb 2005
Location: Dover DE
Posts: 71
Rep Power: 0
 
Trader Score: 0 reviews
is that normal?

97 Taurus GL 'THE WILLOW GREEN STREET MACHINE' 3.0 OHV, AX4N Trans, Mods.-air intake silencer removed, Cyber White foglamps, Black Fuzzy Dice on the rear view mirror. Future Mods/Projects-home brew intake, CD player,SHO spoiler. 155,000 miles and counting.......
T@urus3.0 is offline  
post #4 of 12 (permalink) Old 04-11-2005, 06:22 PM
Crazy Devoted Member
 
shoz123's Avatar
 
Join Date: Nov 2002
Location: Ashkum, Illinois
Posts: 14,122
Rep Power: 56
 
Trader Score: 4 reviews
Normal for Ford programming. You will notice that if the climate control is in a non-AC state such as floor or vent only that it will not do this.

It takes a chip to program it out. Really dumb idea because it causes excess wear on the TC clutch and heats up the fluid. But maybe that is Ford's plan?????

Paul Nimz
'10 Red Genesis Coupe
'08 Hyundai Accent
shoz123 is offline  
post #5 of 12 (permalink) Old 04-11-2005, 07:20 PM
Devoted Member
 
Join Date: Feb 2005
Posts: 2,972
Rep Power: 0
 
Trader Score: 0 reviews
Any comments on this? Very similar-sounding thing:

I have an '02 with the Vulcan, 37K. I have been suspicious of my transmission too. I'll explain this scenario as though I'm accelerating gently and steadily because I know the numbers better:

From a dead stop, shift 1-2 at about 15mph. Keep going; shift 2-3 at about 25mph. Once I hit about 33-35mph, I also get a little surge and the tach drops about 200-300 RPM from around 2500RPM. Then usually immediately afterward in the 35-37mph range, I get the final kick down to around 1500 RPM. It's almost like 4 shifts? What is up with that? Which of those final 2 bumps is the TC?

*Edit* This is with a/c off.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
sfontain is offline  
post #6 of 12 (permalink) Old 04-11-2005, 07:25 PM
Devoted Member
 
Join Date: Oct 2003
Location: Binghamton, New York
Chapter: Northeast
Posts: 2,277
Rep Power: 0
 
Trader Score: 0 reviews
have you tried unhooking the battery for an hour.. I do it overnight. Drive like you want it to be driven and it will adapt to your driving style.....

Current Vehicals:
1998 Volvo V70 AWD 196,000 (project)
1998 Volvo S70 T5 206,000 (daily driver)
1996 Ford Taurus LX 187,000 (rusted out, but drives)
1980 Mazda RX-7 Anniversary X 142k (project)



Past Vehicals
1993 Isuzu Trooper (junked)
1992 Ford Tempo GL (sold)
1992 Subaru Loyale (sold/junked)
1994 Toyota Camry LE (sold)
1996 Ford Taurus GL (junked)
1994 Ford Aerostar Cargo (sold)
1993 Ford Taurus (traded)
1990 Ford Tempo GL (sold/junked)
1987 Dodge Aries (junked)
tmonster is offline  
post #7 of 12 (permalink) Old 04-11-2005, 07:42 PM
Devoted Member
 
Join Date: Feb 2005
Posts: 2,972
Rep Power: 0
 
Trader Score: 0 reviews
Quote:
Originally posted by tmonster@Apr 11 2005, 07:25 PM
have you tried unhooking the battery for an hour.. I do it overnight. Drive like you want it to be driven and it will adapt to your driving style.....
Geez...another thing I've been wanting to ask.

The car was driven I presume mostly by the same person up until 35K when I got it. So another question is, to what extent is the car unable to adapt? What I mean is, if somebody drives the car from fresh keepalive memory for 35K, then I get in it and drive it for 2000 miles, how different is its current state than it would be if I just started fresh?

I know these kinds of things are a mystery for a lot of people and I've been doing as much research as I can find online, but sometimes it's hard because it's even tough for Ford techs because I just think even Ford doesn't completely disclose that info to them.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
sfontain is offline  
post #8 of 12 (permalink) Old 04-11-2005, 08:03 PM
Crazy Devoted Member
 
shoz123's Avatar
 
Join Date: Nov 2002
Location: Ashkum, Illinois
Posts: 14,122
Rep Power: 56
 
Trader Score: 4 reviews
Quote:
Originally posted by sfontain@Apr 11 2005, 06:20 PM
Any comments on this?* Very similar-sounding thing:

I have an '02 with the Vulcan, 37K.* I have been suspicious of my transmission too.* I'll explain this scenario as though I'm accelerating gently and steadily because I know the numbers better:

From a dead stop, shift 1-2 at about 15mph.* Keep going; shift 2-3 at about 25mph.* Once I hit about 33-35mph, I also get a little surge and the tach drops about 200-300 RPM from around 2500RPM.* Then usually immediately afterward in the 35-37mph range, I get the final kick down to around 1500 RPM.* It's almost like 4 shifts?* What is up with that?* Which of those final 2 bumps is the TC?

*Edit* This is with a/c off.
Yes your car should shift like this. 1st unlocked to 2nd unlocked to 3rd unlocked to 3rd locked to 4th unlocked to 4th locked.

It is hard to feel the 3rd unlocked/locked transition but it can be seen with data monitoring software. It is also rumored that it happens in second also but I have not seen it happen. With the Auto Tap software I can see the amount of slip that is across the TC clutch. When it is locked there is usually 0 to 5 rpm slip.

On the V8 SHO you will feel a real change at WOT when the TC locks up in 3rd which is usually around 80 mph or so.

Ideally when you accelerate, after up shifting or down shifting and after a slight pause you want the TC locked. This also is what gives very little engine braking when you first let up on the gas while cruising. At this time the TC is slipping and will after a while lockup to get real engine braking.

Paul Nimz
'10 Red Genesis Coupe
'08 Hyundai Accent
shoz123 is offline  
post #9 of 12 (permalink) Old 04-11-2005, 08:11 PM
Devoted Member
 
Join Date: Feb 2005
Posts: 2,972
Rep Power: 0
 
Trader Score: 0 reviews
Quote:
Originally posted by SHOZ123@Apr 11 2005, 08:03 PM
Yes your car should shift like this. 1st unlocked to 2nd unlocked to 3rd unlocked to 3rd locked to 4th unlocked to 4th locked.

It is hard to feel the 3rd unlocked/locked transition but it can be seen with data monitoring software. It is also rumored that it happens in second also but I have not seen it happen. With the Auto Tap software I can see the amount of slip that is across the TC clutch. When it is locked there is usually 0 to 5 rpm slip.

On the V8 SHO you will feel a real change at WOT when the TC locks up in 3rd which is usually around 80 mph or so.

Ideally when you accelerate, after up shifting or down shifting and after a slight pause you want the TC locked. This also is what gives very little engine braking when you first let up on the gas while cruising. At this time the TC is slipping and will after a while lockup to get real engine braking.
Well holy crap that's it--I had no idea the TC was supposed to lock in third.

So that small bump that drops from about 2500 to 2200, that's the TC locking in 3rd? Or is it the 3locked to 4unlocked shift? Likewise, is the 2200->1500 drop the 3rdlocked->4unlocked or 4unlocked->4locked?

I really appreciate this. This is my first automatic transmission! (*sigh*)


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
sfontain is offline  
post #10 of 12 (permalink) Old 04-11-2005, 08:18 PM
Crazy Devoted Member
 
shoz123's Avatar
 
Join Date: Nov 2002
Location: Ashkum, Illinois
Posts: 14,122
Rep Power: 56
 
Trader Score: 4 reviews
When the TC locks it will drop the rpm about 300, when it unlocks it will raise the rpm about 300 rpm.

Paul Nimz
'10 Red Genesis Coupe
'08 Hyundai Accent
shoz123 is offline  
Sponsored Links
Advertisement
 
Reply
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Taurus Car Club of America : Ford Taurus Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome