False Overheating?
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 11 of 11
Northstar Engines and System Technical Discussion Discussion, False Overheating? in Cadillac Engine Technical Discussion; I have a 96 Eldorado that goes into limp mode around 190 degrees. I pulled the codes and along with ...
  1. #1
    Rustbucket350 is offline Cadillac Owners Member
    Automobile(s): 96 Eldorado
    Join Date
    Mar 2012
    Posts
    7

    False Overheating?

    I have a 96 Eldorado that goes into limp mode around 190 degrees. I pulled the codes and along with the overheat code it also has a #8 cylinder misfire and a bad O2 sensor. Would a misfire cause the early overheat condition? Obviously the engine isn't actually overheating since there is no spillage from the surge tank and the temperature is too low. Could it be the temp sensor or possibly a bad pcm?

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Cadillac Eldorado ETC
    Join Date
    Aug 2010
    Location
    Kennewick WA
    Age
    35
    Posts
    4,644
    Check the purge line and do a block test

  4. #3
    Rustbucket350 is offline Cadillac Owners Member
    Automobile(s): 96 Eldorado
    Join Date
    Mar 2012
    Posts
    7

    Re: False Overheating?

    What do you mean by block test? I tested the coolant for exhaust gases and I didn't see any. I'll check the purge line though

  5. #4
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    70,494

    Re: False Overheating?

    I wonder if you might not have a faulty ECT sensor.

  6. #5
    Rustbucket350 is offline Cadillac Owners Member
    Automobile(s): 96 Eldorado
    Join Date
    Mar 2012
    Posts
    7

    Re: False Overheating?

    I'm wondering that too. I do have a new one that I can put in so I'll try that too. I realized its not quite going into limp mode but it gives me the idle engine message at 190 which I still think is a little early.

  7. #6
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    70,494

    Re: False Overheating?

    It's not a "little" early. It's VERY early. You shouldn't get that message til about 265 degrees (maybe a tad earlier).

  8. #7
    jimsbox is offline Cadillac Owners Enthusiast
    Automobile(s): 2000 DHS
    Join Date
    Apr 2005
    Location
    Kansas City
    Age
    60
    Posts
    560

    Re: False Overheating?

    I'm confused, if you know it is 190 from the dash read out, would that not have been reading the ECT? Maybe the computer has a glitch in it posting the message at 190 which isn't even up to normal temperature yet.

  9. #8
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    41,621

    Re: False Overheating?

    Ummm............ "Limp mode" is very, very different from "Camel mode".

    Limp mode occurs when some part of the emissions or ignition system fails and defaults the timing to about (fixed) 10 degrees BTDC.

    Camel mode drops successive pairs of cylinders during extended intervals of engine temps above 265 degrees.

  10. #9
    Rustbucket350 is offline Cadillac Owners Member
    Automobile(s): 96 Eldorado
    Join Date
    Mar 2012
    Posts
    7

    Re: False Overheating?

    Well it appears the purge line is fine. I should probably mention that the car also runs fairly hot most of the time. It doesn't overheat but it runs around 240 degrees or so and I haven't been able to figure it out. The water pump is new and the fans work fine. Maybe its the radiator or thermostat?

  11. #10
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    70,494

    Re: False Overheating?

    GM DID use the sealant tabs in '96. I suppose it could not hurt to flush the radiator and blow out the cooling fins with compressed air and then flush them with a garden hose. Remember, the A/C condenser is in front of it. Also check the WP belt tensioner. Thermostat is possible, not probable.

  12. #11
    djmumm is offline Cadillac Owners Member
    Automobile(s): 37s, 57s, 93 eldo, 02 DHS, 05 XLR
    Join Date
    Feb 2004
    Location
    Farmington,MN
    Posts
    12

    Re: False Overheating?

    Hi
    I had a similar problem with my 93 eldo. n* engine. It would go into camel mode, and then back out of camel mode 5 to 20 seconds later. It would declare that the engine was hot, it would kick the fans on high, and go to half power. The temp reading was always fine on the dash readout, before going to camel mode. It would never blow any anti-freeze out of it. Unfortunately, the readout cannot display the temp, and complain about overheating at the same time. I worked through a number of things to try to see if the engine really was hot. I was worried that it had sucumbed to the dreaded head gasket problem. I replaced temp sensors, checked thermostat, etc. Anyhow, to make a long story short, I narrowed it down to suspecting the ECM. I then went to my nearest junk yard, picked up a cheap ECM, ($20), and the problem was fixed. I have since put 20K miles on it and all is well. It turns out that the ECM in the 93 is prone to cold solder joints. The ECM that I got from the junk yard happened to have been rebuilt, so even the better. My 93 ECM is a common one with a removable PROM. Unfortunately, I believe the the ECM in a 96 may be one that needs to be programed? Others can probably help with this question.

    I just read that your car is running at 240 degrees, so my experience is much different. My car was always between 190- 210 when the problem occured.

    Good Luck. Dave

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