Cannot getg into E.6.3 ISC Motor
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 9 of 9
HT4100 4.1, 4.5, 4.9 Discussion, Cannot getg into E.6.3 ISC Motor in Cadillac Engine Technical Discussion; I cannot get into the E.6.3. ISC Motor Diagnostic to check the ISC Minimum. Can anyone help? Got a 88 ...
  1. #1
    Romy is offline Cadillac Owners Member
    Automobile(s): 1988 Fleetwood D'Elegance
    Join Date
    Jul 2007
    Location
    Switzerland
    Age
    39
    Posts
    52

    Cannot getg into E.6.3 ISC Motor

    I cannot get into the E.6.3. ISC Motor Diagnostic to check the ISC Minimum. Can anyone help?
    Got a 88 Fleetwood 4.5L

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
    Join Date
    Jun 2005
    Location
    Michigan
    Posts
    668

    Re: Cannot getg into E.6.3 ISC Motor

    Not sure what you mean. What are you trying to do. Set minimum air?

  4. #3
    Romy is offline Cadillac Owners Member
    Automobile(s): 1988 Fleetwood D'Elegance
    Join Date
    Jul 2007
    Location
    Switzerland
    Age
    39
    Posts
    52
    Thread Starter

    Re: Cannot getg into E.6.3 ISC Motor

    Yes, I need to check the ISC settings. I got a new one and it need to be set. With E.6.3 you can retract the minimum air screw to its minimum tocheck if it's touching the throttle. I cannot check that. Without checking that I cannot solve my problem. Once the car is warm it has a idling problem, its shaking when I accelerate. Sometimes its even shaking when its in PARK. I replaced the sparkplugs, all wires are fine, Cat should be fine (I got good values on that) Maybe the ECM could be the problem?

  5. #4
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003
    Location
    california
    Age
    67
    Posts
    5,988

    Re: Cannot getg into E.6.3 ISC Motor

    Be aware the ISC only works to control idle speed. Skaking on acceleration rules out the ISC. Do you get the parameter 91 to display? Do you have the factory manual?

  6. #5
    Romy is offline Cadillac Owners Member
    Automobile(s): 1988 Fleetwood D'Elegance
    Join Date
    Jul 2007
    Location
    Switzerland
    Age
    39
    Posts
    52
    Thread Starter

    Re: Cannot getg into E.6.3 ISC Motor

    I've got the manual. What should I try to do? What do yo mean by parameter 91? Diagnostic code?

  7. #6
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003
    Location
    california
    Age
    67
    Posts
    5,988

    Re: Cannot getg into E.6.3 ISC Motor

    You need to read the section on understanding how to enter diagnostics. Moving from section 70 to the test procedeures is what I assume you dont understand. Once "ECM" is displayed at the end of the code search you need to press hi fan which ,to the computer, is answering yes. By factory manual do you mean the GM manual, not Haynes or Chilton. The on board diagnostics are capable of not only supplying fault codes but showing engine RPM, timing, coolant temp and many other parameters once you are familiar with navigating thru whats available.

  8. #7
    Romy is offline Cadillac Owners Member
    Automobile(s): 1988 Fleetwood D'Elegance
    Join Date
    Jul 2007
    Location
    Switzerland
    Age
    39
    Posts
    52
    Thread Starter

    Re: Cannot getg into E.6.3 ISC Motor

    I know the diagnostic and it's function. That's not the problem. The GM manual says after 70 appears press HIGH and then ECON to get to E6.3.. After HIGH it shows E9.5 on display (which is good) but then I push ECON to get to E6.3 and nothing happens. I can't get to E6.3...
    any other suggestions on my shaking problem. It's not a hard shaking but it's not the smooth drive of a Cadillac I'm used to. Thanks for any suggestions

  9. #8
    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
    Join Date
    Jun 2005
    Location
    Michigan
    Posts
    668

    Re: Cannot getg into E.6.3 ISC Motor

    OK, well, first of all, the ISC is not causing your problem. It does not control anything other than idle speed. Here's what I'd check, given your misfire when warm:

    1. Have you replaced the cap and rotor? These might be worn. Cheap to replace and eliminate.
    2. Check the EGR valve. If this is sticking open, it will cause your drivability issues. Misfiring, shaking at idle. Push up on the underside of the diaphram. Make sure it's not sticking.

  10. #9
    Romy is offline Cadillac Owners Member
    Automobile(s): 1988 Fleetwood D'Elegance
    Join Date
    Jul 2007
    Location
    Switzerland
    Age
    39
    Posts
    52
    Thread Starter

    Re: Cannot getg into E.6.3 ISC Motor

    Thanks for your reply and help. I've replaced sparks, rotor, cap and EGR valve. It works very much better. But still when it's warm it shakes a little while acceleration but less than before. I thought maybe the fuel injector filter might be clogged. any ohter ideas?

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