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VS V6 hesitation on acceleration, miss on idle as well

Discussion in 'VR - VS Holden Commodore (1993 - 1997)' started by pete30nz, May 29, 2019.

  1. pete30nz

    pete30nz Member

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    Hey people,
    My 1996 VS v6 has a hesitation / miss on down low initial acceleration, Also a miss on idle.
    When I'm taking off from a full stop at the lights, i just touch the pedal less then quarter throttle, it's like a splutter as it rolls of the line at low power, then it gives good power about 2 or 3 seconds after accelerating.

    The car has a tune from the1, recently also new delphi crank angle sensor, new delphi tps.
    New bosch oxy sensors about a year and a half ago.
    I just cleaned the mass air flow yesterday with mass air cleaner, it mite be mind over matter if that made a difference or not.

    Any help would be good

    Cheers Pete
     
    Last edited: May 29, 2019
  2. losh1971

    losh1971 Well-Known Member

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    Grab a good coil from somewhere and swap it over until you try all three to see if that is the issue.
     
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  3. pete30nz

    pete30nz Member

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    Hi losh1971, funny you messaged this.
    I just thought I'd inspect the coils and leads, and found the 2 & 5 coil, number 2 has a tarnished look to it, compared to all other coil plug tips, see photo attached.

    Now I'm curious what to do next?
    I also have another old coil pack that has a corroded plug number 2 as well

    Pete
     

    Attached Files:

    Last edited: May 29, 2019
  4. pete30nz

    pete30nz Member

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    I've noticed I can hear a miss right near the air filter box, it's loud enough if you put your head near the air filter box you can just hear it. Its doing it here and there, not constant
     
  5. vs-lover

    vs-lover Well-Known Member

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    This could also be an injector playing up, but I'd do exactly what Losh has suggested and that is to substitute one coil pack at a time and see if that solves the issue. I must admit having a good spare coil pack is a must have in your arsenal to identify a firing issue, apart from that a suspect lead is the next thing, failing that it'll probably be an injector as I recently found out with my Calais that does no miles at all and just gets a static running in the garage every 2 weeks. I poured some "Liquid Moly" Injector cleaner into the tank and soon after that the suspect injector jumped into life and as such the miss was gone.
     
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  6. pete30nz

    pete30nz Member

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    Hi VS lover,
    I've using some vx or vy injectors, that were rebuilt and cleaned and flow matched by a JC tuning team member.
    Also a tune done to run them in the VS V6.
    I'm hoping they are still all good, I've had them just under a year now.

    I'll have to try new leads when I can afford them, and I replaced only the one coil pack today, will do the other two soon.

    Cheers
    Pete
     
  7. vs-lover

    vs-lover Well-Known Member

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    No No No,

    it's not about changing all the coil packs. You need to only use one and change a single unit then run the car and evaluate, if no change put back the coil pack you changed and move to the next one and repeat the exercise.
    When doing the leads all you need is one long one and do much the same and substitute one lead at a time and evaluate.

    This exercise is not about spending bucket loads of cash in R&R but merely individual trial and error and process of elimination with no cash out lay. We can all spend lots of money and get no result if we try.
     
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  8. pete30nz

    pete30nz Member

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    This is very true, some thing I'd normally do.
    I was testing my leads today on the 200k ohms reading, and got this:
    Spark plug leads assessment on 200k ohms
    No 5 = 02.4 3rd shortest lead
    No 3 = 02.3 2nd shortest lead
    No 1 = 01.9 shortest lead
    No 2 = 04.4 4th shortest lead
    No 4 = 04.7 5th shortest lead
    No 6 = 04.3 6th shortest lead
    Would any one say its bad?

    I did know what you meant about changing one coil pack at a time, I'm about to do the other 2. One coil at a time
     
  9. pete30nz

    pete30nz Member

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    I guess this is not correct.
    Next thing I spose would be testing the coil packs, as I'm not sure all my spares are good

    Pete
     
  10. iana57

    iana57 New Member

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    hey Pete
    i've been down this road a few times as well, and the best advice was at the start by losh and vs-lover!
    also be very wary of bench-testing the coils or leads etc, as during the last "miss/hesitate/backfire" experience
    in my car, all the coils and leads checked out fine, but put them under load and they usually will fail again
    leading to even more head scratching and frustration!!!
    I was lucky with son having brand new set of leads for a v8, so just swapped one bank at a time and narrowed it down from there.
    now the car is running the best it ever has, even though I was certain it would be the damn coils again... good luck :)
     
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  11. pete30nz

    pete30nz Member

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    Thanks for the advice people, I now have a new set of leads to put on, as I didn't have any spares.
    I will do some over the next few days, and post back.
    Fingers crossed

    Pete
     
  12. pete30nz

    pete30nz Member

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    Sorry I only just thought to ask, what did yours turn out to be iana57
     
  13. ephect

    ephect Donating Member

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    As nice as it is to find the culprit, I would be dropping a full set of new leads and plugs on. No point having 1 spanker and the others 60k + that may fail in the coming months, giving you more grief.

    Plugs and leads are cheap enough to replace as a set
     
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  14. pete30nz

    pete30nz Member

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    Hi people

    I've done new leads 2 days ago, and I've changed out coil packs with what I think are good ones. I don't have a brand new one to swap out / in.

    Now I'm curious as to how the coil pack plug gets corroded, as my number 2 on coil pack has done on 2 different coil packs.

    I will get a new set of plugs a.s.a.p

    Pete
     
  15. pete30nz

    pete30nz Member

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    Evening,

    I've also just done spark plugs this afternoon.
    No difference in the miss, it still has one.
    I listened to the injectors, apart from one I couldn't reach, and they all sounded consistent. Tick tick tick tick..

    I was reading another thread earlier on, and they say it could be oxy sensors,which I did change about a year and a quarter ogo. Or even a broken valve spring?

    Sigh

    Pete
     
  16. pete30nz

    pete30nz Member

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    This site seems to be dead lately.
     
  17. iana57

    iana57 New Member

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    sorry for the late reply mate, it turned out to be leads! I didn't bother to narrow it down further than left bank, just replaced the lot,
    even though the old ones checked out fine with a multimeter!
    thinking back to the last time I had these issues, car still had hesitation under load and wouldn't kick-down properly (4/3)
    after replacing the coils...I was just relieved to have finally got it to run OK again!

    And thinking back some more (difficult) being quite silly...thats how this car had ALWAYS run, lots of hesitation when it should have been kicking down over 90!
    I would just shift from D to 3 to save the drama without a second thought hahahaha, I'm just gonna blame it all on the medication!!!
     
    Last edited: Jun 24, 2019
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  18. pete30nz

    pete30nz Member

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    I'm also blaming it on the medication haha.

    I still have a darn miss
    Spark plugs new, plug leads new, tps is new delphi, cas new delphi, oxy sensors new a year and a half ago suppose to be bosch, new iat sensor fuel miser.
    Not brand new- recond injectors, coil packs and dfi module 2nd hand.


    I'll have to try the one from the dfi and coil packs from the VR on the VS and see if there's any difference.

    Pete
     
  19. iana57

    iana57 New Member

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    I feel your pain Bru...
    just wondering tho, with all the stuff you've changed, have you ever done a computer reset??
    since you are chasing your ass anyway, and it wont cost a cent... you just never know!
     
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  20. ephect

    ephect Donating Member

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    One thing that concerns me is the reco injectors. I've bought a set in the past and my old ones checked out perfect and the reco set were all over the shop.

    Why did you change injectors?

    Q, how long have you had the miss for?
     
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