Volvo RWD 700 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 2/2022 700 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

Causes of weak, orange spark at coil 700 1988

posted by  rstarkie on  Wed Dec 19 04:15 CST 2007
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Oct 24 10:14 CST 2014
[RELATED]

In trouble shooting the no start on the 744T I found the spark from the coil to ground to be orange and not the desired blue/white.

Besides the coil itself what else might be contributing to the weak spark?

Randy








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    Causes of weak, orange spark at coil 700 1988

    posted by  spasske on  Mon Dec 24 12:35 CST 2007
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Thu Oct 23 10:11 CST 2014
    [RELATED]

    I always thought the electric spark that ionizes oxygen only made blue sparks.

    I recently was getting poor/intermittant spark from bad wires. One could easily tell bad wire by opening the hood when it was dark out. I could see blue light at the poor connections at the boot.
    --
    Paul NW Indiana '89 740 Turbo 128,000








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    Causes of weak, orange spark at coil 700 1988

    posted by  aleekat on  Mon Dec 24 04:10 CST 2007
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 13:19 CST 2014
    [RELATED]

    A weak battery can cause this. It can sound good turning over, but not start. More noticeable with turbos. Have you jumped it to see if it will start ?
    --
    Post Back. That's whats makes this forum work.








    •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

      Causes of weak, orange spark at coil 700 1988

      posted by  rstarkie on  Mon Dec 24 04:23 CST 2007
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Fri Oct 24 10:14 CST 2014
      [RELATED]

      My post was concerning a weak spark that I found while troubleshooting a no start situation after the car slid on slippery streets and impacted the curb.

      In the end the problem turned out to be the intank pump. The impact pulled the pump loose and created an open space on the fuel pickup. I added fuel and once it was up over the open space and I purged the line of air I had fuel and pressure at the rail and the car started.

      I was looking for what might contribute to the weak spark that I came across in trying to figure out the no start.

      Sorry that I did not make that clear in starting this thread.

      Randy








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    Causes of weak, orange spark at coil 700 1988

    posted by  someone claiming to be a volvo believer on  Sun Dec 23 12:27 CST 2007 [RELATED]

    My 1989 244 has an orange spark, and it starts well and runs fine. I would look elsewhere for your no-start problem.







  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    Causes of weak, orange spark at coil 700 1988

    uid 40935's pic
    posted by  Goatman on  Wed Dec 19 04:48 CST 2007
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Sat Jul 26 20:30 CST 2014
    [RELATED]

    R, you might check that a full battery voltage is present at the coil, as any voltage drop would affect the coil output.

    Also, it would be wise to check the grounding of the ignition computer, because a weak ground would also be a problem.








    •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

      Causes of weak, orange spark at coil 700 1988

      posted by  B.B. on  Sun Dec 23 15:22 CST 2007
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Mon Oct 6 13:15 CST 2014
      [RELATED]

      Ditto Goatman. You don't want to find any voltage drop at the coil lugs.
      I think that you can place your voltmeter accross the two lugs of the coil and see any bad connections since the grounded lug at the coil goes back to gnd thru the power stage and control unit.
      You should see more than battery voltage with the car running: <14VDC
      Dont overlook a bad coil HV wire!

      Happy holidays, Bill






<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.