Reverse slipping?
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 7 of 7
HT4100 4.1, 4.5, 4.9 Discussion, Reverse slipping? in Cadillac Engine Technical Discussion; Hey, I have a ht4100 '82 deville. I changed the fuel pump and replaced a bad brake line and so ...
  1. #1
    Slacker is offline Cadillac Owners Fanatic
    Automobile(s): 1987 Cadillac Fleetwood Brougham
    Join Date
    Jun 2008
    Posts
    125

    Reverse slipping?

    Hey,

    I have a ht4100 '82 deville. I changed the fuel pump and replaced a bad brake line and so I finally got a decent "test drive" out of my car. I took it around the block and it had zero problems shifting. When I got home, I went to reverse up the driveway and I noticed reverse gear was slipping. (high RPMs but slow movement). But still all other gears work fine...

    Any suggestions? Both transmission and engine were rebuilt before I bought the car. (within the past 12 years. Car has only been driven 10k miles in the past 10 years though...)

    Any ideas? Fluid looks nice and red too and not burnt.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
    Automobile(s): 93 & 88 Allante, 88 Eldorado
    Join Date
    Jan 2004
    Posts
    779

    Re: Reverse slipping?

    It could be a number of different things from bad clutches to a broken accumulator spring or a leaking valve body gasket. I would start with the easy things such as checking the fluid to make sure it is full. This is done with the transmission fully warmed and while the engine is idling in park. The next thing I would do is drop the pan and change the filter and fill the transmission oil back to full.

  4. #3
    Slacker is offline Cadillac Owners Fanatic
    Automobile(s): 1987 Cadillac Fleetwood Brougham
    Join Date
    Jun 2008
    Posts
    125

    Re: Reverse slipping?

    Yeah, I drove it down the block to my friends house so we could shop vac the inside and we noticed it was slipping worse.

    I popped the hood and checked the fluid. It was empty! I put some in and the car now shifts fine. I probably should have done that when I first got the car, but I'm still no where near done working on it and only drove it maybe two blocks since I've owned it. (Sat for years before I bought it)

    I'm thinking I probably lost a lot of it when I changed out the radiator the day before because it was sitting disconnected for a few days so some might have dripped out from the cooler lines. Also, I did turn it over once w/ no radiator (bad idea, but it was for a quick test b/c we couldn't even get the car to start then). When I turned it on, it sprayed out about 1/2 the oil and I suppose transmission fluid the few seconds it was on out of the hoses.

    Chalk this one up to my own stupidity.

    Unrelated question, but I figure it's not worth making a new thread over. Today I turned the car on and it ran a bit rough so the SES light was on. (First time since I got it running). I turned the car off, put the car in the "on" position and went to check the codes by shorting the test terminal. When I did the the SES light came on and stayed on and the fuel economy part of the dash just read "0.0". I didn't see any codes blink. Was there a seperate button I had to press to show them? I know this car has some sort of complex diagnostic system built in... or did the codes not save once I turned it off? (I read in my chiltons book that there were two types of ways cadillac had the codes, where they are saved and where they erased after it's turned off... I figure that an '82 should save the codes... my '84 chevy does...)

    Any ideas?

  5. #4
    Slacker is offline Cadillac Owners Fanatic
    Automobile(s): 1987 Cadillac Fleetwood Brougham
    Join Date
    Jun 2008
    Posts
    125

    Re: Reverse slipping?

    Update:

    I managed to get the "off" and "warmer" button press to display codes. I had code 52 in the system. I checked my chiltons book and it said that's a ECM failure. The car idles and runs fine, wouldn't an ECM failure make it run like garbage? Also, after putting the transmission fluid in, it goes from park, reverse, neutral, drive fine. When in drive though, it shifts late into 2nd. It didn't feel so much like a slip, just a late shift point. Could the be related to the 52 error code? Or are there vacuum lines I can check that might be leaking? I can't really bring the car to a transmission shop yet b/c it's not "on the road" and I can't do much more than circle the block until I do.

    Thanks.

  6. #5
    Slacker is offline Cadillac Owners Fanatic
    Automobile(s): 1987 Cadillac Fleetwood Brougham
    Join Date
    Jun 2008
    Posts
    125

    Re: Reverse slipping?

    2nd Update

    Changed the trans filter and fluid. Fluid looked fine and there were no metal flakes in the pan. (Even used a magnet to see if I could find particles... nothing out of the norm).

    I did notice the throttle was sticking when the car was idling high, I walked over and moved the throttle to the ISC and it was at a normal idle then. I cleaned up the linkage and the problem mostly went away. The error code 52, after further research was just an ECM reset, probably from when the battery was dead or me tinkering around once I managed to get the diagnostic mode working.

    I did get error 30 today which is a ISC circuit problem error. Seeing that the transmission problem vanished once the throttle was working properly I'm wondering now if with the throttle sticking, the TPS, MAF, and other sensors used to set the ISC were reading higher idle and then when the computer compensated by rolling back the ISC throttle pin and with the throttle being stuck thus not moving back to the new idle, the computer figured the ISC wasn't moving correctly. Am I close in my thinking?

    To fix the slight stick that's left, could I use a new / slighly heavier spring to keep the throttle pinned to the ISC when I'm not pressing the gas pedal? (The current one is rusted and seems to be well worn...)

    Thanks.

  7. #6
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
    Automobile(s): 93 & 88 Allante, 88 Eldorado
    Join Date
    Jan 2004
    Posts
    779

    Re: Reverse slipping?

    Quote Originally Posted by Slacker View Post
    2nd Update

    To fix the slight stick that's left, could I use a new / slighly heavier spring to keep the throttle pinned to the ISC when I'm not pressing the gas pedal? (The current one is rusted and seems to be well worn...)

    Thanks.

    Try lubricating your throttle cable before installing a heavier spring.

  8. #7
    Slacker is offline Cadillac Owners Fanatic
    Automobile(s): 1987 Cadillac Fleetwood Brougham
    Join Date
    Jun 2008
    Posts
    125

    Re: Reverse slipping?

    Quote Originally Posted by Edahall View Post
    Try lubricating your throttle cable before installing a heavier spring.
    I tried doing that with PB Blaster.

    While the car was off, I sprayed everything while working the throttle cable.

    Is there a better lubricant I can use?

    Thanks.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

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

Please enter a valid email address for yourself.

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.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting