User Tag List

Thanks Thanks:  0
Likes Likes:  0
Results 1 to 7 of 7

Thread: Signum throttle 'pulsing' problem

  1. #1
    Regular Member
    Join Date
    Jul 2009
    Location
    Brighton
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default Signum throttle 'pulsing' problem

    OK, got a problem with the siggy. It's only apparent on warm up, about 70'C. It feels like the throttle is being put on then off, giving a mild pulsing/lurching sensation.
    When cold or fully warm, it's fine.
    I've tried it with cruise control and without.
    It's a 150 CDTi.
    I've looked at the field remedy for the 3rd injector, but my engine number is out of it's range, so I assume it's been corrected by the factory.

    My fuel filter needs replacing, but can't see why this would show up at certain temperatures.

    Any ideas before a trip to Vx?

  2. #2
    Full Member bobssignum's Avatar
    Join Date
    Dec 2007
    Location
    polishing something or other somewhere
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Signum 2.0 DTi

    Trim : Elegance/Elite

    Engine : 2.0DTi

    Year : 2003

    Mileage : 73350

    Default

    Does this only occur on tick over if so then it is almost certainly the throttle position sensor , they ware at the bottom of the scale ;ie first 25% of throttle position best bet is to have it tech 2ed to see what fault codes show up if its as above then expect to see a p0380 code
    Driving vauxhall,s for 30 + years
    and still loving it

  3. #3
    Regular Member
    Join Date
    Jul 2009
    Location
    Brighton
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default Idle?

    Don't know if it happens in idle. I'll try tonight. When it happens I'm usually on the dual carriageway, so I'll be carefull. Don't want someone driving into me. Would it be lumpy in idle or smooth if the throtle sensor is duff?

    I've looked at the secret menus and there's no fault codes stored. I've even looked at the BC/TC inst values but not sure what I'm looking at .

    I can only assume the temperature thing is when the thermostat opens.

  4. #4
    Full Member bobssignum's Avatar
    Join Date
    Dec 2007
    Location
    polishing something or other somewhere
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Signum 2.0 DTi

    Trim : Elegance/Elite

    Engine : 2.0DTi

    Year : 2003

    Mileage : 73350

    Default

    What is probably basically happening is you have an inbalance between your throttle sensor and the oxygen sensor so one sensor is saying not enough air /fuel mix entering the throttle and the other is saying the opposite hence the surging.
    If your throttle sensor was duff your tick over during idle will surge up and down between 475-500 and back to the normal tick over of around 800-825 .if you have the car running in this state remove one of the vacuum hoses ,car should settle back to normal revs.
    Last edited by bobssignum; 26th November 2010 at 11:50.
    Driving vauxhall,s for 30 + years
    and still loving it

  5. #5
    Regular Member
    Join Date
    Jul 2009
    Location
    Brighton
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Quote Originally Posted by bobssignum View Post
    What is probably basically happening is you have an inbalance between your throttle sensor and the oxygen sensor so one sensor is saying not enough air /fuel mix entering the throttle and the other is saying the opposite hence the surging.
    If your throttle sensor was duff your tick over during idle will surge up and down between 475-500 and back to the normal tick over of around 800-825 .if you have the car running in this state remove one of the vacuum hoses ,car should settle back to normal revs.
    Thanks
    I'll give that a try. Maybe if I'm feeling adventurous, I might have a look at the throttle sensor solder joints, read on here that they can have a dry joints.

  6. #6
    Regular Member
    Join Date
    Jul 2009
    Location
    Brighton
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Right, tried it idling and no differnece, normal idle speed. It's only apparent for about a minute, so not much time for diagnosis!

  7. #7
    Regular Member the-wizard's Avatar
    Join Date
    Dec 2007
    Location
    Tamworth - ''The Capital of Mercia''
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : vectra-c

    Trim : sri

    Engine : cdti

    Year : 2004

    Mileage : 98,000

    Default

    have a look at the how 2 for the throttle body, could have oil in the circuit board area or needs the re solder fix!.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 2.0 dti throttle postion sensor problem
    By frankiebdv in forum Engine & Drivetrain
    Replies: 0
    Last Post: 25th March 2012, 14:15
  2. throttle problem
    By stuart bigboy in forum Engine & Drivetrain
    Replies: 14
    Last Post: 13th June 2011, 18:14
  3. LED Flashing / pulsing
    By Steven T Davies-Moss in forum Electrical & ICE (including SatNav)
    Replies: 3
    Last Post: 30th October 2009, 22:56
  4. throttle problem with a vectra B 2.0 16v
    By bappy in forum Engine & Drivetrain
    Replies: 4
    Last Post: 21st August 2009, 14:19
  5. '03 2.2DTI Signum Throttle Body suspect
    By garthmatthews in forum Engine & Drivetrain
    Replies: 0
    Last Post: 23rd December 2008, 01:56

Visitors found this page by searching for:

Nobody landed on this page from a search engine, yet!

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •