This ones got me...
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 12 of 12
RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, This ones got me... in Past Cadillac Vehicle Discussion; I'm one who is always trying to help, but now I'm stumped on this one...This is a 94 Fleetwood.. It ...
  1. #1
    drmenard is offline Cadillac Owners Enthusiast
    Automobile(s): 95 fleetwood 81 deville
    Join Date
    May 2003
    Location
    Massachusetts
    Posts
    984

    This ones got me...

    I'm one who is always trying to help, but now I'm stumped on this one...This is a 94 Fleetwood.. It all started when the check engine light came on... It was code 63 and 64. So I put in a new O2 sensor on bank 2.. Then after that I just get a 63 code.. So I put in another O2 sensor, because I had one, same thing code 63... So just for the hell of it I changed the PCM, same thing code 63.. Put the old pcm back in.. and checked all the wires , no shorts and 12 volts to the heater ... With my cheapo meter I checked the voltage from 1666 and 1667 and got .62v, then I went on another no problem 94 and checked the voltage and got the same readings , everything checked the same readings...There has got to be something I'm missing... Dave

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    lacville78 is offline Cadillac Owners Fanatic
    Automobile(s): 77 Cadillac CDV
    Join Date
    Feb 2011
    Age
    28
    Posts
    355

    Re: This ones got me...

    Hmmm. I researched it a bit and came up with this. "An O2 sensor failure or a problem in the sensor’s
    wiring circuit will prevent the system from going into
    closed loop causing a rich-fuel condition, increased
    emissions (particularly carbon monoxide) and fuel
    consumption. Keep in mind that a bad coolant
    temperature sensor can also prevent the system from
    going into closed loop."

    Maybe something to do with the coolant sensor?

  4. #3
    drmenard is offline Cadillac Owners Enthusiast
    Automobile(s): 95 fleetwood 81 deville
    Join Date
    May 2003
    Location
    Massachusetts
    Posts
    984

    Re: This ones got me...

    The book says it won't set a 63 code until it reaches 180 something degrees. so it can't set the code until it thinks its hot..

  5. #4
    popo8's Avatar
    popo8 is offline Cadillac Owners Member
    Automobile(s): Escalade
    Join Date
    May 2013
    Age
    38
    Posts
    27
    Was that the LT1?

  6. #5
    HUF's Avatar
    HUF
    HUF is offline Cadillac Owners Connoisseur
    Automobile(s): 1995 FWB 100,*** miles CURRENT. 1991 Seville 175,000 SOLD
    Join Date
    Dec 2005
    Location
    MA
    Age
    55
    Posts
    2,006

    Re: This ones got me...

    Quote Originally Posted by popo8 View Post
    Was that the LT1?
    94 Fleetwoods come with LT1.

  7. #6
    lacville78 is offline Cadillac Owners Fanatic
    Automobile(s): 77 Cadillac CDV
    Join Date
    Feb 2011
    Age
    28
    Posts
    355

    Re: This ones got me...

    What brand 02 sensors? Aftermarket might not work right.

  8. #7
    turbojimmy's Avatar
    turbojimmy is offline Cadillac Owners Connoisseur
    Automobile(s): 1994 Fleetwood 60" Stretch; '07 Avalanche, '95 Nighthawk
    Join Date
    Apr 2004
    Location
    New Jersey
    Posts
    3,958

    Re: This ones got me...

    Use the HVAC unit to see what the coolant temp sensor is reporting. It's option #8.

  9. #8
    drmenard is offline Cadillac Owners Enthusiast
    Automobile(s): 95 fleetwood 81 deville
    Join Date
    May 2003
    Location
    Massachusetts
    Posts
    984

    Re: This ones got me...

    I may have more problems.. Went to check the temp sensor and it would not start... No spark.. changed the module , still no spark.. Plugged the old module back in and took off the coil wire to check ohms.. checked good, put a new one on anyway... Started right up.. still don't think it was the wire , I will try the old one later... Started it up , let it run and it the temp went right up just like it should... Now this 63 code is only set went its running and turns on, after I shut it off the code is gone and don't come on for miles...

  10. #9
    popo8's Avatar
    popo8 is offline Cadillac Owners Member
    Automobile(s): Escalade
    Join Date
    May 2013
    Age
    38
    Posts
    27
    Quote Originally Posted by HUF View Post
    94 Fleetwoods come with LT1.
    Clearly... I didnt know if it also had an L99 option as well

  11. #10
    lacville78 is offline Cadillac Owners Fanatic
    Automobile(s): 77 Cadillac CDV
    Join Date
    Feb 2011
    Age
    28
    Posts
    355

    Re: This ones got me...

    Hmmmm. Maybe there is a bit of intermittent weak spark on that bank which would prevent it from going into closed loop?

  12. #11
    drmenard is offline Cadillac Owners Enthusiast
    Automobile(s): 95 fleetwood 81 deville
    Join Date
    May 2003
    Location
    Massachusetts
    Posts
    984

    Re: This ones got me...

    Well I got the no spark and then spark again thing fixed.. The no spark can be caused by no pulse from distributor, but there are two pulses and if it were a no pulse it would set a code. So we can rule that out. I had swapped out the module when it had a no spark , and it did not work.. So rule out the module.. So now it leaves the coil... I check the coil with a ohm meter and all tests look good.. It was tested with a cheap harbor freight meter... Here is another thing I noticed when it was running and then not running and then running again, when in park and just revved up the motor it had a bit of a backfire through the exhaust, kind of like a cheap muffler sound.. So I put a new coil on and also I used a know to be good module just in case... Now it runs great.. Even though the coil tested good with the meter it was bad...The muffler sound is back to normal.. So now I will report back and see if this was related to the code 63 problem.. Dave

  13. #12
    lacville78 is offline Cadillac Owners Fanatic
    Automobile(s): 77 Cadillac CDV
    Join Date
    Feb 2011
    Age
    28
    Posts
    355

    Re: This ones got me...

    I hope it works out for you. I wonder how long does it take for the computer to turn off the check engine light once it goes into closed loop operation.

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