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1406 hesitation.

Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011.

  1. elcamino65
    Joined: Jan 24, 2010
    Posts: 277

    elcamino65
    Member
    from washington

    Hey guys I need a little help with my edelbrock 1406. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. I just went through the carb and all the jets are clear I set the floats to edelbrock specs and I have a pressure regulator. Someone said I might need to advance the timing? Any suggestions
    Thanks
     
  2. Rich Rogers
    Joined: Apr 8, 2006
    Posts: 2,018

    Rich Rogers
    Member

    is it backfiring through the carb or exhaust?
     
  3. elcamino65
    Joined: Jan 24, 2010
    Posts: 277

    elcamino65
    Member
    from washington

    Makes a poping or pinging sound not a real loud backfire
     
  4. 52pig
    Joined: Jun 9, 2007
    Posts: 436

    52pig
    Member

    You know my buddy has that same carb on his 327 that sits in his '52 chevy. I think he may even have the same issues, going to look at it this week end.
    I'll be keeping an eye on this thread.
    My self I think it's a pile of junk.


    You know, my buddies car ran great until one day the carb stuck at wot. No visible reasons, internal issues.
     

  5. usmc50lx
    Joined: Oct 3, 2006
    Posts: 711

    usmc50lx
    Member
    from St.Louis

    what pump setting is it at, whats your fuel pressure, and what timing do you run? I had two 1406's on a 355 that ran GREAT!!! it took work to get tit there but it was a holy terror all the way through the RPMs, I'm sure we can get ya squared away
     
  6. 52pig
    Joined: Jun 9, 2007
    Posts: 436

    52pig
    Member

    I like the sound of bumping the timing. How about the air/fuel screws? I was curious about the base setting on those.
     
  7. 52pig
    Joined: Jun 9, 2007
    Posts: 436

    52pig
    Member

    Could it be a lean misfire?
     
    JimSibley likes this.
  8. elcamino65
    Joined: Jan 24, 2010
    Posts: 277

    elcamino65
    Member
    from washington

    The regulator is set up at 4 1/2 lbs I know it can take more but the reg is a cheap thing so I don't believe the settings
     
  9. usmc50lx
    Joined: Oct 3, 2006
    Posts: 711

    usmc50lx
    Member
    from St.Louis

    Generally I run those at all the way in then 2.5-3 turns back out that is the standard factory setting from edelbrock
     
  10. 52pig
    Joined: Jun 9, 2007
    Posts: 436

    52pig
    Member

    Cool, that's pretty much what I thought.
     
  11. usmc50lx
    Joined: Oct 3, 2006
    Posts: 711

    usmc50lx
    Member
    from St.Louis

    ok is it one of the cheap dial regulators from RPC or Mr Gasket... I've seen those piles be set at 5 and be around 9psi on an autometer gauge lol i run the holley 12-803 or an Aeromotive style regulator
     
  12. 52pig
    Joined: Jun 9, 2007
    Posts: 436

    52pig
    Member

    I'd think you could go a little higher. What should it be?^^
     
  13. usmc50lx
    Joined: Oct 3, 2006
    Posts: 711

    usmc50lx
    Member
    from St.Louis

    and 52pig I agree another thing is could it have too much timing so its detonating instead of being an actual carb issue?
     
  14. echale3
    Joined: May 13, 2011
    Posts: 26

    echale3
    Member

    Sounds like either timing or valve lash, if you know the carb's set up OK.
     
  15. 52pig
    Joined: Jun 9, 2007
    Posts: 436

    52pig
    Member

    I am starting to agree with the timing.
     
  16. elcamino65
    Joined: Jan 24, 2010
    Posts: 277

    elcamino65
    Member
    from washington

    Well I took the idle screws out a little further and it's doing better still backfires through the carb sometimes under load, going to adjust the timing too.

    I have a power glide question. I have a linkage that comes up just to the drivers side of the dizzy and connects to the tranny just above the gear shift.any ideas?
     
  17. The idle mixture screws only set fuel air mixture at idle. Above that you are working with the springs on your metering rods.Heavier springs slow down the secondaries and lighter springs make them come in faster.
    I would guess if you are getting a ping at "tip in" your timing is a little too far advanced,a backfire is likely retarded timing. put a light on it and see where you're at.
     
  18. Stock engine, or what other mods have you made?

    What's the TOTAL ignition timing (initial+centrifugal+vacuum advance if so equipped)?

    How much manifold vacuum at idle and cruising speed?

    Are the metering rods and power pistons moving freely in their bores?

    Are any of the plug wires bundled closely together for any length?
     
  19. Merlin
    Joined: Apr 9, 2005
    Posts: 2,546

    Merlin
    Member
    from Inman, SC

    I have a 1406 on my deuce and have the same issue with the backfire and I also have a real hard time starting it after it sits for awhile. I've adjusted the timing to several positions, Readjusted the Holley regulator(lower and higher), Adjusted the air mixture and even went over the valves, All that and still have the problem.

    With that said it was suggested to me to replace the carb with another 1406 however with cash limited thats gonna have to wait a bit. Apparently some of these model carbs have metering flaws that Edelbrock won't admit.
     
  20. 52pig
    Joined: Jun 9, 2007
    Posts: 436

    52pig
    Member

    In my first post I talk a little junk, but I do agree that some seem to have flaws. I personally rebuilt my friends engine, he brought it to the shop and I tuned it. Was running beautifully until...it stuck at 3/4 throttle on the highway. We pulled over and there were no external issues. I backed idle all the way out and nothing.
    Now, nothing but issues, sputtering at initial throttle, stalling in gear.
    I've banged my head a couple times dicking with the car to no avail, that's why I'm watching this thread. I tune old cars all the time and have never had this much trouble. And like above he doesn't have the money to buy a new carb right now.
    It has to be the part.
    So has the OP found his solution?
     
  21. I had a 625 Comp Series AFB do that once, but it was on a cold damp morning and I had cold air intake via hood scoop on my Duster. I pulled over, popped the hood and the carb was iced. In about a minute the heat from the motor thawed it out and the carb snapped closed. I stuffed a rag in the scoop and kept going to work, no further problems.

    There used to be a machining problem on some of the 500 AFB's where a passage wasn't drilled deep enough and there was a transition problem from idle, sounds like edelbrock might be having a similar issue.

    Basically if the timing is right, you have cleaned the carb, set the floats and made sure everything is kosher in assembling the carb, I would try another carb to see if it is engine or carb.
     
  22. dirtcop
    Joined: Dec 16, 2005
    Posts: 184

    dirtcop
    Member

    I installed a 1406 carb on a 327 and a Pertronix distributor / coil at the same time. Sometimes under a little load it would backfire up the carb. I advanced the carb a little bit three times and the backfire went away for a little while and then would backfire again. One evening the car just died with no warning. The coil had gone bad. I replaced the coil and it has never backfired again. I have had very good luck with the edelbrock carbs and this was the only time I was thinking there was a carb problem, but my doubts were misplaced. Be sure all ignition parts are in good condition before replacing carb (cheaper fix).
     
  23. DrJ
    Joined: Mar 3, 2001
    Posts: 9,418

    DrJ
    Member

    You didn't say what it's on, (or I didn't see it) what motor, cam, distributor, headers, etc.
    1406 is a "lean" version of a 1405 so it might be too lean for headers, but I'd suspect your timing is the culprit.
    Does it also do it when it's cold and the choke is still "on"?
     
  24. dickster27
    Joined: Feb 28, 2004
    Posts: 3,199

    dickster27
    Member
    from Texas


    Just install a heat insulator block between the carb and intake. Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose.
     
  25. Edelbrock sells a calibration kit #1487 for your carb. Sounds like you have to richen it up.
     
  26. Elcamino65 ,did you just get this running or was it running good before,the reason I ask is that I am wondering what kind of intake you are using.Everyone probably knows this already but edelbrock carbs work great on late edelbrock intakes but some early intakes required that thin sheetmetal spacer between two gaskets ,I had this backfire ,hard restart,glowing header prob on my 27 with an edel.dual plane ...pre performer era intake,kinda looked like a psuedo spread bore /square bore intake .really resembled the newer performer types now made.
    I have a 1405 on my 55 f-100 302,no probs,a 1407 on my 65 galaxie no probs ,twin 1405s on my 27 no probs for 12 years.I guess Ive just been reeeel lucky.
     
  27. zman
    Joined: Apr 2, 2001
    Posts: 16,594

    zman
    Member
    from Garner, NC

    4 1/2 is plenty. between that and maybe 5 1/2 for an Edelbrock

    Dickster's spot on, the insulator is a good idea, but the timing could be an issue as well, and should be verified. Then think about metering rods and springs.
     
  28. 52pig
    Joined: Jun 9, 2007
    Posts: 436

    52pig
    Member

    Oh man, I don't wanna think! Set it and forget it! right?
    But really, don't mean to highjack the OP, I'm going down to check out my friends car this weekend. I am throwing a spacer on it, he actually has one for the intake.
    And I'm taking my timing gun!
    Once and for all! Done.
     
  29. Piewagn
    Joined: Mar 25, 2009
    Posts: 1,333

    Piewagn
    Member

    Sounds to me like a "lean" pop and ping.........
     
  30. Merlin
    Joined: Apr 9, 2005
    Posts: 2,546

    Merlin
    Member
    from Inman, SC

    Me and another guy got in a heated argument with a so called Edelbrock tech at a Goodguys event last fall over the hard starting issue, He insisted they they weren't aware of it. However I do have one already and it didn't help much.
     

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