I can't be the only one? 1994 Eldorado red hot exhaust manifold
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
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 29
Like Tree1Likes
Cadillac Seville / Cadillac Eldorado Forum Discussion, I can't be the only one? 1994 Eldorado red hot exhaust manifold in Past Cadillac Vehicle Discussion; I'm stuck, and in need of help. I have a 1994 Eldorado that runs beautiful. But if you sit at ...
  1. #1
    Henryetta's Avatar
    Henryetta is offline Cadillac Owners Member
    Automobile(s): Eldorado
    Join Date
    Mar 2014
    Location
    S. Orange County, California.
    Posts
    11

    I can't be the only one? 1994 Eldorado red hot exhaust manifold

    I'm stuck, and in need of help. I have a 1994 Eldorado that runs beautiful. But if you sit at a light to long or parked with it idling the check engine light comes on and then the exhaust manifold gets cooking red hot. It takes about 30 sec. for the exhaust manifold to get hot once the engine light comes on. If I pull over and shut the car off, wait 5 sec or so then start it. The lights off and the manifold doesn't get hot. Intel I get stuck at the next long red light again. What I have done so far is changed both 02 sensors, new e.g.r. valve, new plugs and wires, 2 new coils on the coil block. And new catalytic converter. I have even taken off the exhaust and ran it with nothing except the exhaust manifold, and the same thing happened. And there are absolutely no codes that come up. It's really starting to piss-me-off because I love this car and cant drive it. Oh and about 6 mo. prior I had a shop change the main wire harness and PCM. Because the harness goes over the manifold and melted then frying the PCM. Thank you in advance for any help.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
    Automobile(s): Crimson 2001 Seville STS, 1990 Seville (RIP)
    Join Date
    Sep 2010
    Location
    East Boston MA.
    Age
    26
    Posts
    21,534
    If the check engine light is coming on, there are codes. How are you pulling them?

  4. #3
    Henryetta's Avatar
    Henryetta is offline Cadillac Owners Member
    Automobile(s): Eldorado
    Join Date
    Mar 2014
    Location
    S. Orange County, California.
    Posts
    11

    Re: I cant be the only one?

    I'm pulling them by the on board module or climate control by pressing the heater button and off button simultaneously. I just went and checked again and I now get P030 in history and a P103 current. (P030 Ideal speed control out of range / P103 open brake booster vacuum sensor)

  5. #4
    amunderdog is offline Cadillac Owners Connoisseur
    Automobile(s): 1994 SLS x 2 ---- 1993 Eldorado Sport ----- 1994 Deville 4.9
    Join Date
    Feb 2010
    Location
    Sunbright, TN
    Posts
    1,262

    Re: I cant be the only one?

    The only thing that pops into my pea brain is going lean.

    That would be P042 or P044 though.
    Guess I would inspect the wiring to the 02 sensors

    > "P103 open brake booster vacuum sensor"
    A vacuum leak could cause it to go lean.

  6. #5
    rodnok01's Avatar
    rodnok01 is online now Cadillac Owners Connoisseur
    Automobile(s): 98 DeVille, 97 DeVille d'Elegance
    Join Date
    Feb 2012
    Location
    NC
    Posts
    3,845

    Re: I cant be the only one?

    Red hot manifold equals running lean. I would check your fuel pressure also.

  7. #6
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,487

    Re: I cant be the only one?

    I suspect running rich with a leaky FPR or stuck open injector.

  8. #7
    oldstuff is offline Cadillac Owners Fanatic
    Automobile(s): 66 convert-93-96-97-97-99 Eldorados
    Join Date
    Nov 2013
    Location
    McCleary Wa.
    Age
    78
    Posts
    430

    Re: I cant be the only one?

    Pull the brake booster hose and check the booster for holding vacuum with the pedal depressed like you would have at a stop light. I've seen them leak vacuum and still apply the brake. An easy test is put in park at the light and keep your foot off the brake. If it is only drawing vacuum while the brake is applied your problem won't show. If it is drawing vacuum all the time you will have an idle problem and possibly a random miss.
    Dave


    Quote Originally Posted by Henryetta View Post
    I'm pulling them by the on board module or climate control by pressing the heater button and off button simultaneously. I just went and checked again and I now get P030 in history and a P103 current. (P030 Ideal speed control out of range / P103 open brake booster vacuum sensor)

  9. #8
    Henryetta's Avatar
    Henryetta is offline Cadillac Owners Member
    Automobile(s): Eldorado
    Join Date
    Mar 2014
    Location
    S. Orange County, California.
    Posts
    11

    Re: I can't be the only one? 1994 Eldorado red hot exhaust manifold

    Thank you guys I' going out to see what I can do right now. You guys have giving me a new direction to go in. I'll keep you informed on what happens.

  10. #9
    Henryetta's Avatar
    Henryetta is offline Cadillac Owners Member
    Automobile(s): Eldorado
    Join Date
    Mar 2014
    Location
    S. Orange County, California.
    Posts
    11

    Re: I can't be the only one? 1994 Eldorado red hot exhaust manifold

    Ok I have taken care of the code P103 Checking the vacuum at the brake boost like suggested with no leaks I also checked the fuel pressure and its at spec. But now the only code I get is P080 (tp sensor learn not complete.) I'm not sure what I did but that's what comes up. So does anyone now how to complete the learning process for the tp. sensor? And yes the manifolds are still getting hot. I don't think I can fix that until I fix the P080 code. Thanks again for the help.

  11. #10
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
    Automobile(s): Crimson 2001 Seville STS, 1990 Seville (RIP)
    Join Date
    Sep 2010
    Location
    East Boston MA.
    Age
    26
    Posts
    21,534
    P080 is Fuel System Rich.

    If its not the FPR, you may have a sticking injector.

  12. #11
    Henryetta's Avatar
    Henryetta is offline Cadillac Owners Member
    Automobile(s): Eldorado
    Join Date
    Mar 2014
    Location
    S. Orange County, California.
    Posts
    11

    Re: I can't be the only one? 1994 Eldorado red hot exhaust manifold

    Quote Originally Posted by MoistCabbage View Post
    P080 is Fuel System Rich.

    If its not the FPR, you may have a sticking injector.
    My Chilton book says that the code P080 is TP Sensor/ idle learn not complete. How ever I will check for a stick (bad injector) just to make sure. I don't think the injectors have ever been changed. I know I haven't and I'm the second owner. So it couldn't hurt. But does any one know how to do the idle learn procedure. I can't seem to find it in this stupid book. If I do find it I will post it for other people to use with the same problem. Again thanks for the help.

  13. #12
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,487

    Re: I can't be the only one? 1994 Eldorado red hot exhaust manifold

    Use Chiltons to sop up oil or coolant spills. If you are going to work on this car, get a real FSM by Helm Inc. Ebay is your friend.

    Go up to the DTC Sticky in the forum page. Click on the OBDI link for your DTC definitions.

    P.S.
    Remember, your FPR is inside the manifold. When you test it, you have to remove the manifold cover. Test it at key on to energize the fuel pump and look for a leak at the nipple, but DO NOT crank the motor. With that manifold cover off it will run away unthrottled at WOT and bounce off of the rev limiter. Just have someone turn the key on while you watch the FPR nipple.

  14. #13
    Mark C's Avatar
    Mark C is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Seville STS, 2000 Seville STS
    Join Date
    Jul 2007
    Age
    56
    Posts
    1,676

    Re: I can't be the only one? 1994 Eldorado red hot exhaust manifold

    Wow!! How much heat does it take to make an exhaust manifold glow, or its that just a description of them looking like they are really hot? I've seen header tubes glow red, and even an exhuast pipe near the engine, but those are thin wall steel tubes. never seen a hunk of cast iron the size of an exhuast manifold glow red. If you can really see a color change in you manifolds do not drive the car until this is resolved, as the aluminum head will melt (1221 degrees)at a much lower temperature than those glowing exhaust manifolds (2200 degrees).

  15. #14
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,487

    Re: I can't be the only one? 1994 Eldorado red hot exhaust manifold

    Cast Iron? Are you sure Mark? They look like steel to me.



    EDIT:
    Disregard. I see the earlier ones appear to be cast iron.
    This one is '93, '94. '95


  16. #15
    oldstuff is offline Cadillac Owners Fanatic
    Automobile(s): 66 convert-93-96-97-97-99 Eldorados
    Join Date
    Nov 2013
    Location
    McCleary Wa.
    Age
    78
    Posts
    430

    Re: I can't be the only one? 1994 Eldorado red hot exhaust manifold

    Dirtyer but not cast iron. Look at the welds. Never see that on cast.
    Dave

    Quote Originally Posted by Ranger View Post
    Cast Iron? Are you sure Mark? They look like steel to me.



    EDIT:
    Disregard. I see the earlier ones appear to be cast iron.
    This one is '93, '94. '95

    drewsdeville likes this.

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