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

Results 1 to 15 of 15

Thread: Engine almost stalls

  1. #1
    Dadillac's Avatar
    Dadillac is offline Cadillac Owners Connoisseur
    Automobile(s): 2015 Mazda3 S GT Hatchback 2013 Kia Optima SXL
    Join Date
    Nov 2004
    Location
    Woodbridge NJ
    Age
    51
    Posts
    2,817

    Engine almost stalls

    So my '02 SLS has developed an issue. At completely random times the engine will drop RPM to the point of almost stalling, and then return to normal. It will occur when the engine is cold, warm, or hot. It will occur when the car is in motion, or when standing still. It never sets a code so I am at a loss. My only guess would be possibly the battery. The battery is the original so it is at least 7 years old. The dash is showing the volts right at 14.4 so it is reading okay. I will say that the dash used to read 14.9 to 15.0 always. Is my battery biting the big one?

    Don


  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    69
    Posts
    82,272

    Re: Engine almost stalls

    I think your battery is fine with those voltage readings. Are the CKP sensors original?

  4. #3
    Dadillac's Avatar
    Dadillac is offline Cadillac Owners Connoisseur
    Automobile(s): 2015 Mazda3 S GT Hatchback 2013 Kia Optima SXL
    Join Date
    Nov 2004
    Location
    Woodbridge NJ
    Age
    51
    Posts
    2,817

    Re: Engine almost stalls

    The CKP were changed out several years ago. When I was having CKP issues, it would stall very now and again. The almost stall issue I am having is happening everytime I drive the car. Thus why I was thinking a battery issue.

    Don

  5. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    Location
    MD Eastern Shore, Kent Island
    Age
    77
    Posts
    56,842

    Re: Engine almost stalls

    Even if the battery was toast, the charging system is apparently providing enough voltage/amperage (14.4) to efficiently run the car.

    Your problem sounds like idle speed control, dirty throttlebody, vacuum leak, or some such engine-related bug.

    Codes ???

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    69
    Posts
    82,272

    Re: Engine almost stalls

    Quote Originally Posted by submariner409 View Post
    Even if the battery was toast, the charging system is apparently providing enough voltage/amperage (14.4) to efficiently run the car.

    Your problem sounds like idle speed control, dirty throttlebody, vacuum leak, or some such engine-related bug.

    Codes ???
    That would have been my next guess. Don't overlook the ever popular ripped plenum.

  7. #6
    Dadillac's Avatar
    Dadillac is offline Cadillac Owners Connoisseur
    Automobile(s): 2015 Mazda3 S GT Hatchback 2013 Kia Optima SXL
    Join Date
    Nov 2004
    Location
    Woodbridge NJ
    Age
    51
    Posts
    2,817

    Re: Engine almost stalls

    Quote Originally Posted by submariner409 View Post
    Even if the battery was toast, the charging system is apparently providing enough voltage/amperage (14.4) to efficiently run the car.

    Your problem sounds like idle speed control, dirty throttlebody, vacuum leak, or some such engine-related bug.

    Codes ???
    I know very little about the sensors and what not so bear with me. If the ISC were failing, wouldn't I be getting codes? A vacuum leak should be a more steady issue, and should become more pronounced while under load. Correct? I am getting no codes when this issue arises.

    Don

  8. #7
    Dadillac's Avatar
    Dadillac is offline Cadillac Owners Connoisseur
    Automobile(s): 2015 Mazda3 S GT Hatchback 2013 Kia Optima SXL
    Join Date
    Nov 2004
    Location
    Woodbridge NJ
    Age
    51
    Posts
    2,817

    Re: Engine almost stalls

    Quote Originally Posted by Ranger View Post
    That would have been my next guess. Don't overlook the ever popular ripped plenum.
    If the plenum is ripped wouldn't that act more like a vacuum leak? And wouldn't it actually cause the RPM's to rise?

    Don

  9. #8
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    69
    Posts
    82,272

    Re: Engine almost stalls

    It would seem that way, but I have seen many of them act very weird here. It's easy enough to test. Just spray some Brakeleen near the base of it. That is where they generally rip. Listen for an RPM increase.

  10. #9
    Dadillac's Avatar
    Dadillac is offline Cadillac Owners Connoisseur
    Automobile(s): 2015 Mazda3 S GT Hatchback 2013 Kia Optima SXL
    Join Date
    Nov 2004
    Location
    Woodbridge NJ
    Age
    51
    Posts
    2,817

    Re: Engine almost stalls

    Quote Originally Posted by Ranger View Post
    It would seem that way, but I have seen many of them act very weird here. It's easy enough to test. Just spray some Brakeleen near the base of it. That is where they generally rip. Listen for an RPM increase.
    I'll try that tomorrow while I do mt brake job. Thanks

    Don

  11. #10
    Dadillac's Avatar
    Dadillac is offline Cadillac Owners Connoisseur
    Automobile(s): 2015 Mazda3 S GT Hatchback 2013 Kia Optima SXL
    Join Date
    Nov 2004
    Location
    Woodbridge NJ
    Age
    51
    Posts
    2,817

    Re: Engine almost stalls

    Well I sprayed the plenum with brake clean and there was no idle change. So I guess I can rule that out.

    Don

  12. #11
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    69
    Posts
    82,272

    Re: Engine almost stalls

    When was the Tb last cleaned?

  13. #12
    Dadillac's Avatar
    Dadillac is offline Cadillac Owners Connoisseur
    Automobile(s): 2015 Mazda3 S GT Hatchback 2013 Kia Optima SXL
    Join Date
    Nov 2004
    Location
    Woodbridge NJ
    Age
    51
    Posts
    2,817

    Re: Engine almost stalls

    Quote Originally Posted by Ranger View Post
    When was the Tb last cleaned?
    That was about two years ago. I was actually thinking of doing a cleaning this afternoon. My almost stalling issue hasn't happened in a few days so I will wait for it to return to look further. But I guess it wouldn't hurt to clean out the throttle body.

    Don

  14. #13
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    69
    Posts
    82,272

    Re: Engine almost stalls

    I do mine every spring Don. Probably a little more often than needed, but it makes the job a piece of cake.

  15. #14
    C0RSA1R's Avatar
    C0RSA1R is offline Cadillac Owners Connoisseur
    Automobile(s): '98 ETC Black 90k miles
    Join Date
    Oct 2008
    Location
    Lisle, Illinois
    Age
    31
    Posts
    1,061

    Re: Engine almost stalls

    I cleaned my TB and had a very noticeable performance increase. Thanks to the step-by-step instructions on this forum, it only took about 45 minutes from start to finish (including finding a proper CD to listen to while I was working).

  16. #15
    Dadillac's Avatar
    Dadillac is offline Cadillac Owners Connoisseur
    Automobile(s): 2015 Mazda3 S GT Hatchback 2013 Kia Optima SXL
    Join Date
    Nov 2004
    Location
    Woodbridge NJ
    Age
    51
    Posts
    2,817

    Re: Engine almost stalls

    I cleaned the throttle body and it wasn't too gunked up. It only took about 10 minutes. I drove the car yesterday and the almost stall occurred one time. So I am at a loss. i just wish it would throw a code. At least I would know where to look. Thanks for the tips guys. I am just gonna drive it and if it ever actually stalls hopefully a code will set that will help me.

    Don


Bookmarks

Cadillac Posting Rules

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Read about Lincoln | Buick | Kia Forte Forum