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Holley 4160 Carburetor hard starting only when cold

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  • waterlogged882
    replied
    Originally posted by tockit View Post
    Where does the other anti-siphon valve live at?
    At the fuel cell, in the fitting, where the fuel line connects.

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    Leave a comment:


  • tockit
    replied
    Originally posted by waterlogged882 View Post
    Check your other (OEM) anti-siphon valve and make sure it is clean or remove it altogether.

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    Where does the other anti-siphon valve live at?

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  • waterlogged882
    replied
    Check your other (OEM) anti-siphon valve and make sure it is clean or remove it altogether.

    .

    Leave a comment:


  • tockit
    replied
    I figured out my cold start problem. I read about it on a hot rod forum and ended up putting a Carter check valve about one foot below the mechanical fuel pump to prevent the fuel in the line from leaking back down into the tank.

    Bam, it starts instantly now. I’m not sure why the fuel was leaking back down, but that was the trick for my cold starts!

    Leave a comment:


  • FrankSchwab
    replied
    Ok, I’m going to be contrary here. What if the problem isn’t too little fuel for a cold start (which is what all the suggestions for pumping the throttle prior to starting are trying to address), and instead is a problem with too little air? Try loosening up the electric choke just a bit so it’s not so aggressively holding the choke plate closed, give the throttle a pump or two, and see if it helps.
    I love my EFI, but I had a number of balky carbed vehicles when I was younger so have a bit of experience, but nowhere near some of the people on here.

    Leave a comment:


  • jayR
    replied
    Easiest is begin with Waterlogged's suggestion. pull off air cleaner and with boat cold and have someone else pump the throttle while looking down the carb. use a flashlight, hold the choke open so you can see. there should be two obvious squirts of fuel.

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  • jayR
    replied
    tockit
    You didn't mention whether you had a flamethower hot coil as well? It has made a big difference on my boat.
    Starting procedures vary but. I usually pump twice, set throttle to the 2 oclock position. let it crank over 5-7 times. if it doesn't start. pump twice more. set 2 oclock, crank 5-7 revolutions etc... sometimes (sadly) my boat can go weeks without usage. Occasionally it will take a series of three to get it to start. also, warm or cold, my boat seems to start best with the throttle set at the 2 oclock postion. (this whole procedure is also the way I was taught to always started old carb cars, #1 never pump while cranking).
    One other thought. just a guess. but I wonder if you used the super thick base gasket when mounting your carb? any possibility there is a vacuum leak at the base which seals up as soon as the boat is warm? you can test it as soon as the boat starts with carb cleaner or starting fluid sprayed around the base.

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  • waterlogged882
    replied
    Originally posted by tockit View Post
    From what I’ve read, it sounds like you and I have a very similar setup, minus the spacer. Do you pump the throttle on your boat before starting cold?

    This cold start problem has me stumped!
    Yes sir I pump the handle a few times but that has always been my M.O. for the carbureted engine. I also have to take into account the PerfectPass to wind and set. Once warm, it starts like a TBI system...with the Arco starter, Pertronix ignition, and a hot coil. Mine does not hesitate on a cold start, just primes itself with a few engine turns then fires right up.

    Air idle screws are tweaked for best performance, PCV is good (it rattles) and I do not have a vacuum leak at the base.

    Accelerator pump has 0.001" gap, float is set at level, 0.66 jet nozzle that sends a nice fuel spray pattern.

    Try tweaking the timing a little for cold start performance and check the advance springs in the bottom of the distributor if you have the OEM distributor.

    .

    Leave a comment:


  • tockit
    replied
    Originally posted by waterlogged882 View Post
    Also, I mount the carburetor directly to the Ed manifold. Two inches seems a bit much. I chose to forego the OEM 1" spacer on the Ed manifold.

    US $0.02

    .
    From what I’ve read, it sounds like you and I have a very similar setup, minus the spacer. Do you pump the throttle on your boat before starting cold?

    This cold start problem has me stumped!

    Leave a comment:


  • waterlogged882
    replied
    Originally posted by tockit View Post
    It has a Pertronix Flamethrower II electronic ignition with an Edelbrock Performer intake and a 2 inch spacer. The carb has the jets, power valve, etc that came in it new from Holley last May.

    It runs perfect in every other parameter except a cold soaked start.
    Also, I mount the carburetor directly to the Ed manifold. Two inches seems a bit much. I chose to forego the OEM 1" spacer on the Ed manifold.

    US $0.02

    .
    Attached Files
    Last edited by waterlogged882; 10-14-2021, 09:15 PM.

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  • waterlogged882
    replied
    Originally posted by tockit View Post
    I don’t have the specs...jet size, power valve, etc, and I haven’t looked at the fuel output pattern closely. I guess I need to do that.
    Merely additional points of reference for trouble shooting.

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    Last edited by waterlogged882; 10-14-2021, 09:04 PM.

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  • tockit
    replied
    Originally posted by waterlogged882 View Post
    Do you have the 32 year old OEM coil installed? Electronic ignition or points in the distributor?

    Do you happen to have the specs...jet size, power valve, etc?

    Looking into the body of the carburetor, what does the fuel output look like...stream, spray, drips, little fuel at all?

    .
    I don’t have the specs...jet size, power valve, etc, and I haven’t looked at the fuel output pattern closely. I guess I need to do that.

    Leave a comment:


  • tockit
    replied
    Originally posted by 88 PS190 View Post
    timing?
    Timing is per spec. 10 degrees BTDC

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  • 88 PS190
    replied
    timing?

    Leave a comment:


  • tockit
    replied
    It has a Pertronix Flamethrower II electronic ignition with an Edelbrock Performer intake and a 2 inch spacer. The carb has the jets, power valve, etc that came in it new from Holley last May.

    It runs perfect in every other parameter except a cold soaked start.

    Leave a comment:

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