Welcome to Club Hot Rod!  The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. 

  •  » Members from all over the US and the world!
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and hundreds of thousands of posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

 
Like Tree5Likes

Thread: random miss
          
   
   

Reply To Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 16
  1. #1
    boomer2480 is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2013
    Location
    Julian
    Posts
    3

    random miss

     



    I have 1977 el Camino with a 400 sbc. All cylinders have 120 plus compression.Hyd valves adjusted. HEI ignition, new rotor,cap,coil,wires,plugs.New carb. No vacuum leaks at all,When I pull each wire one at a time I get the cylinder drop off as expected.All wiring has been checked.The miss like I said is random not evenly spaced like one particular cylinder is not firing. I am at a total loss as what to check next,any ideas?

  2. #2
    NTFDAY's Avatar
    NTFDAY is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2003
    Location
    Springfield
    Car Year, Make, Model: '66 Mustang, 76 Corvette
    Posts
    5,207

    My first thought would be the rotor and/or the cap and possibly the dist if there is any side to side play.
    Ken Thomas
    NoT FaDe AwaY and the music didn't die
    The simplest road is usually the last one sought
    Wild Willie & AA/FA's The greatest show in drag racing

  3. #3
    jerry clayton's Avatar
    jerry clayton is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2006
    Location
    Bartlett
    Posts
    6,830

    check at night in total darkness for spark anywhere around dist cap,wires,plugs/manifolds--
    pat mccarthy likes this.

  4. #4
    boomer2480 is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2013
    Location
    Julian
    Posts
    3

    Like I said the rotor and cap are brand new and the distributer shaft bussings are good no side play at all, thanks

  5. #5
    stovens's Avatar
    stovens is offline CHR Member Visit my Photo Gallery
    Join Date
    Oct 2007
    Location
    Petaluma
    Car Year, Make, Model: 48 Ford F1
    Posts
    9,715

    Boomer did it do this before you replaced the rotor, cap or wires? If not and you still have them, one by one put the old stuff back in to rule out a new part problem. Only other thing I can think of is a coil problem or something with the HEi? Usually it's something simple like a bad contact on one of the plug wires, especially when new and the rubber boot fits so tight that it forms a bit of compressed air when pushed on, that causes the metal contact to pop off the end of the spark plug, even though it looks connected, That's why the complete dark observation is so helpful in finding the culprit.
    Last edited by stovens; 11-15-2013 at 11:21 AM.
    " "No matter where you go, there you are!" Steve.

  6. #6
    rspears's Avatar
    rspears is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Sep 2007
    Location
    Gardner, KS
    Car Year, Make, Model: '33 HiBoy Coupe, '32 HiBoy Roadster
    Posts
    10,681

    What's the brand name on the HEI distributor you put in, or by "HEI Ignition" do you mean a MSD box, or something like that? There are some junk distributors showing up on the market, as well as some counterfeit MSD boxes causing problems out there, too.
    MelloYello likes this.
    Roger
    Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.

  7. #7
    stovens's Avatar
    stovens is offline CHR Member Visit my Photo Gallery
    Join Date
    Oct 2007
    Location
    Petaluma
    Car Year, Make, Model: 48 Ford F1
    Posts
    9,715

    Good point Randy, I remember the post here a while back helping you identify the fake ones
    here is a page about that
    Counterfeit Product Alert: How To Identify A Real MSD 6AL Ignition VS A Fake | BangShift.comBangShift.com.
    " "No matter where you go, there you are!" Steve.

  8. #8
    stovens's Avatar
    stovens is offline CHR Member Visit my Photo Gallery
    Join Date
    Oct 2007
    Location
    Petaluma
    Car Year, Make, Model: 48 Ford F1
    Posts
    9,715

    Randy just found your old post here on this very issue
    Fake MSD Units
    " "No matter where you go, there you are!" Steve.

  9. #9
    ted dehaan's Avatar
    ted dehaan is offline CHR Member Visit my Photo Gallery
    Join Date
    May 2003
    Location
    whittier ca.
    Car Year, Make, Model: 32ford5w,60fordstarliner,55chevy65corvai
    Posts
    645

    pull the cap off and look close at the terminals near where the 4 screws that hold the coil in the cap check check for carbon tracks I have had a number of these after market caps allow the spark jump to the screw I learned any time I change a cap I take those 4 screws over to the bench grinder grind off about 3/16 off so they don't bottom out ......ted
    glennsexton likes this.
    I'LL KEEP MY PROPERTY, MY MONEY, MY FREEDOM, AND MY GUNS, AND YOU CAN KEEP THE CHANGE------ THE PROBLEM WITH LIBERALISM IS SOONER OR LATER YOU RUN OUT OF OTHER PEOPLES MONEY margaret thacher 1984

  10. #10
    HWORRELL's Avatar
    HWORRELL is offline CHR Member Visit my Photo Gallery
    Join Date
    Oct 2003
    Location
    ST.LOUIS
    Car Year, Make, Model: 31 FORD 5 WINDOW,69 442, 305 sprint car,
    Posts
    1,410

    Mix some salt water up in a spray bottle and mist the cap and wires while it's running to check the cap and wires for stray voltage. I have seen plenty of times where spark would run down the side of the plugs from beneath the boots. Usually some dielectric grease in the boots will fix that problem plus it'll keep the dang boots from seizing to spark plugs.

  11. #11
    HOSS429's Avatar
    HOSS429 is offline CHR Member Visit my Photo Gallery
    Join Date
    Jun 2007
    Location
    New Market
    Posts
    2,581

    wait till it strands you on the side of the road then you can find what is wrong ..you can chase gremlins forever ..my latest missfire was a bad MSD box ...felt like burnt points at about 2500 rpms ..
    iv`e used up all my sick days at work .. can i call in dead ?

  12. #12
    MelloYello's Avatar
    MelloYello is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2010
    Location
    Montgomery
    Car Year, Make, Model: 1962 Ford Fairlane 2dr with 289
    Posts
    9,934

    As Roger and Hoss mentioned, there sure seems to be a lot of JUNK showing up in the Ignition parts market. It's a shame but you can't use NEW as a diagnosis tool anymore. When mine laid down, I thought that was what my problem was but mine turned out to be a loose connection. "WHEW"
    .
    " I'm drinking from my saucer, 'cause my cup is overflowed ! "

  13. #13
    rspears's Avatar
    rspears is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Sep 2007
    Location
    Gardner, KS
    Car Year, Make, Model: '33 HiBoy Coupe, '32 HiBoy Roadster
    Posts
    10,681

    Quote Originally Posted by stovens View Post
    Good point Randy, I remember......
    Quote Originally Posted by stovens View Post
    Randy just found your old post..... [/url]
    Not a big deal Steve, but Randy in California wasn't the one posting those, it was me (Roger) from Kansas.... Like I said, not a big deal, but don't want Randy to get confused, wondering when he posted such great stuff!!
    34_40 likes this.
    Roger
    Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.

  14. #14
    stovens's Avatar
    stovens is offline CHR Member Visit my Photo Gallery
    Join Date
    Oct 2007
    Location
    Petaluma
    Car Year, Make, Model: 48 Ford F1
    Posts
    9,715

    Sorry Roger I shouldn't post with a migraine, get all my names confused!!!!!!!!!!!!!
    rspears likes this.
    " "No matter where you go, there you are!" Steve.

  15. #15
    boomer2480 is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2013
    Location
    Julian
    Posts
    3

    It is a stock chevy hei distributer.I have looked for carbon tracks, this is the second coil I have put on it a stock one first and the second one is a super coil that fits in where the stock one goes. I have dialectric grease on all plug boots and the ditributer ends too. The modual in the distributer is new with heat transfer putty under it. I think this dam thing is haunted or possessed.

Reply To Thread
Page 1 of 2 1 2 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Links monetized by VigLink