Results 1 to 7 of 7

Thread: Mini Pulses at Idle

Discussions of Triumph motor cars

  1. #1
    Jedi Trainee HighAltitudeTR3's Avatar
    Join Date
    May 2017
    Location
    Aspen, CO
    Posts
    205
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Mini Pulses at Idle

    Hey Friends, hope you all have had a good summer of cruising and wrenching! I have had a small irritating issue for the last few weeks and I cannot seem to get to the bottom of it.

    My engine pulses at idle. Like mini surges. Imagine at the same stroke of the engine. Iím leaning towards the fuel pump, but not sure why that would cause it if the floats are full. Could be that the carbs arenít synced, but Iíve done everything youíre supposed to do to sync them (I have the vacuum tool and Iím turning my fuel mixtures the same...)

    Anyone else had this issue? Or better yet found some relief from it? Iím ready to dive a little deeper in to this to get my idle back...
    *1959 TR3A
    *1951 Chevy Fleetline Deluxe
    *1986 GMC Sierra Classic

  2. #2
    Freshman Member
    Join Date
    May 2019
    Location
    Carlisle PA
    Posts
    7
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: Mini Pulses at Idle

    Mine does the same thing. Have had my TR3 for three months now so I am new to what they should sound and run like but I have wondered if this pulse as you have described is normal or something that can be illuminated with a tuneing procedure. I am currently experiencing a rattling in the engine which I think is coming from the timing chain. It is getting louder as I put more miles on it so I was thinking if it is a loose timing chain could that cause a pulse in the idle??

  3. #3
    Obi Wan
    Join Date
    Feb 2016
    Location
    Macon Georgia
    Posts
    2,414
    Thanks Thanks Given 
    10
    Thanks Thanks Received 
    30
    Thanked in
    28 Posts

    Re: Mini Pulses at Idle

    What RPM are you idling at?

    Mine lopes or surges if I drop the RPM down below 800.

    David
    TR3A TS75524L

  4. #4
    Luke Skywalker
    Join Date
    Jan 2007
    Location
    Winnipeg ,Manitoba,Canada
    Posts
    1,928
    Thanks Thanks Given 
    23
    Thanks Thanks Received 
    1
    Thanked in
    1 Post

    Re: Mini Pulses at Idle

    I don't think TR3 motors like to idle under 800 rpm. Mine seems happy at around 1200 rpm

  5. #5
    Obi Wan
    Join Date
    Feb 2016
    Location
    Macon Georgia
    Posts
    2,414
    Thanks Thanks Given 
    10
    Thanks Thanks Received 
    30
    Thanked in
    28 Posts

    Re: Mini Pulses at Idle

    I have mine set to idle at 850. Seems to do fine. Any slower and it starts to do the loping bit.

    David
    TR3A TS75524L

  6. #6
    Yoda CJD's Avatar
    Join Date
    Feb 2011
    Location
    Arlington, TX, USA
    Posts
    5,220
    Thanks Thanks Given 
    4
    Thanks Thanks Received 
    25
    Thanked in
    25 Posts

    Re: Mini Pulses at Idle

    Can you better define "pulses"?
    John

    1955 TR2

  7. #7
    Luke Skywalker
    Join Date
    Aug 2010
    Location
    Strafford, NH
    Posts
    1,669
    Thanks Thanks Given 
    6
    Thanks Thanks Received 
    10
    Thanked in
    10 Posts

    Re: Mini Pulses at Idle

    Try putting some heavy oil or grease on your throttle shafts where they go through the carb bodies and see if that stops it. If so that would mean the shafts and bushings are worn. The oil wont fix it but it can seal them temporarily and let you know if that's the problem. Sometimes you can feel the play too if they are loose. Just a thought.
    Tom
    1960 TR3A TS73117 (under endless restoration, owned since 1964)
    1959 TR3A TS58023 (in case I never finish the one above)
    1969 Triumph Herald 13/60 (a whim)
    1970 Lotus Elan Plus 2 /0023/N
    1992 BMW325IC (fun to drive)

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
  •