Stumbling on the on ramps 4.9
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

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 5 of 5
HT4100 4.1, 4.5, 4.9 Discussion, Stumbling on the on ramps 4.9 in Cadillac Engine Discussion; 1993 Deville 4.9 . Running very good except in the last month on 3 occasions , She stumbled under acceleration ...
  1. #1
    zentrade is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac 1993 Deville 4.9, 1991 Eldorado Touring Coupe
    Join Date
    Dec 2006
    Posts
    370

    Stumbling on the on ramps 4.9

    1993 Deville 4.9 . Running very good except in the last month on 3 occasions , She stumbled under acceleration on highway on ramps all 3 times.

    Common denominator was moderate acceleration while turning right. She will bog,lose speed and stumble for about 5 to 7 seconds, but not stall.....Then kick in and go.

    Oxygen sensor is disconnected. I went to replace it and cracked a 7/8 oxygen sensor socket which i presumed was low quality even though i knew the sensor would not come out easily and resumed attempt to remove using a deep 7/8 so i cut the wires. ( no need to call me dumb here, i know already...but i thought second attempt would not fail)

    Using a Craftsman 7/8 only resulted in a 1/2 drive U joint tearing apart (Craftsman also) so the old sensor still in until i get it replaced by someone else..Just disconnected.

    Not sure if all the stumbling started before or after the sensor incident but at least one time i know for sure was after, but thought i would mention it as it is the only engine issue i am aware of. May or may not have anything to do with the stumbling which only occurs in the manner i explained. Any ideas or thoughts? And anyone in Southern NH or Northern MA want to take a crack at removing a very stubborn 02 sensor ?


  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    cadillac_tech is offline Cadillac Owners Fanatic
    Automobile(s): 2008 SRX
    Join Date
    May 2007
    Location
    Parker , CO
    Posts
    403

    Re: Stumbling on the on ramps 4.9

    Quote Originally Posted by zentrade View Post
    1993 Deville 4.9 . Running very good except in the last month on 3 occasions , She stumbled under acceleration on highway on ramps all 3 times.

    Common denominator was moderate acceleration while turning right. She will bog,lose speed and stumble for about 5 to 7 seconds, but not stall.....Then kick in and go.
    What was the fuel level when this happened? It sound like tank baffles that have cracked. Most noticeable under 5 gallons.

  4. #3
    zentrade is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac 1993 Deville 4.9, 1991 Eldorado Touring Coupe
    Join Date
    Dec 2006
    Posts
    370
    Thread Starter

    Re: Stumbling on the on ramps 4.9

    Thanks for replying!. Im not sure about fuel level at the time, But at about 6 gals or so i usually fill back up so it had at least that.

  5. Remove Advertisements
    Cadillac Forums
    Advertisements
     

  6. #4
    behind-bars is offline Cadillac Owners Connoisseur
    Automobile(s): 93 Sedan Deville 4.9L
    Join Date
    Sep 2005
    Location
    Texas
    Posts
    1,005

    Re: Stumbling on the on ramps 4.9

    no o2 sensor may be causing you to run very rich, which may cause stumbling; seems like your fuel mileage would take a huge kick though.

    Have you tried anything like pb blaster or other penetrating oils to loosen it up? I forgot how i removed my sensor, I know i didnt use a o2 socket. IIRC I used locking pliers and just really tightened them on and turned it.

  7. #5
    zentrade is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac 1993 Deville 4.9, 1991 Eldorado Touring Coupe
    Join Date
    Dec 2006
    Posts
    370
    Thread Starter

    Re: Stumbling on the on ramps 4.9

    Thanks for reply! Yes gas mileage is very bad right now so im not wanting to put this off any longer.

    I`ll give the PB blaster a try and some locking pliers before giving up and bringing it in. I hate to do that, I know they will complain how long it took to do and hit me with a huge labor bill.

    I had a breaker bar on a 2 foot extension with a 2 foot length of pipe over the bar. The little bugger never budged and ate the first socket and a craftsman universal. The exhaust system was flexing like heck too...Was fearful any more force than that would break something in the exhaust....But i`ll give your suggestions a try.
    Thanks!

  8. Remove Advertisements
    Cadillac Forums
    Advertisements
     

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

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

Please enter a valid email address for yourself.

What Cadillac(s) do you own? (Or type NONE)

Please select your insurance company (Optional)

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
  •