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Thread: New 496 wont run??
          
   
   

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  1. #1
    Camaro350 is offline CHR Member Visit my Photo Gallery
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    New 496 wont run??

     



    Hey guys, I need some help or guidance, I have a newly pro built 496 for my 1969 camaro, it was originally dynoíd by the company it was built by so it has been run. it got shipped to us and We installed it into my camaro, its mated to a 700r4. When I first got it running it would run but not very well. It had about 6 inch of vacuum at idle. And didnít like off idle much and would be around 700rpms and the exhaust would burn your eyes. It has a quick fuel 830 carb with electric choke on it and a msd hei ignition with mech advance. I first tried to tweak the carb setting the floats and then the mixture screws but no change. I changed out the fuel with fresh 93 and started messing with the distributor. I found that the cap was damaged so I replaced the cap and rotor, set the engine on tdc, at 0 on the crank verified it was on the compression stroke but I canít get the distributor to point exactly to #1 cylinder, I can get close but not exact when at zero on the crank. i have verified plug wires are in correct location with running order but now after all that it starts and now dies right away. Iíve pulled all plugs they were wet with fuel mostly likely, I cleaned them took the carb off and reset everything I could see but still nothing. I am new to old school carbs and distributors, I am use to obd stuff, please help thanks!

  2. #2
    Camaro350 is offline CHR Member Visit my Photo Gallery
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    Also some more info :
    I have tried to adjust the timing by turning the distributor both ways and still no change. I am
    running a mechanical fuel pump. I am waiting for my fitting to come in so I can install a gauge and see my pressure. My carb has sight glasses so I can see the float levels and they are set to just below half way. Right now I have the card choke set to be closed when starting. I have tried to adjust the idle throttle screw from full closed to slightly open with no change. My issue is I am not sure if it’s a timing issue or fuel issue. Once I pulled the plugs and reset the timing the engine fires right up but then dies a few seconds later. I talked to the engine builder and they told me that I should have around 14 inches of vacuum at idle. The timing should be 13 initial and 36 total. Not sure if it’s running to rich and flooding the cylinders, when I bore scope number one I have a little fluid built up in the corner of the cylinder wall on top of the piston but I don’t know if that’s oil or fuel. I am assuming it’s fuel because the plug is wet and smells like fuel not oil. I set the idle mix screws to 1-1/4 turn out from stop which is even leaner then what it comes from the factory. I was told that the engine parred with this trans should run rich but I have a feeling it’s too rich but I don’t know how to find that out or what to look for.

  3. #3
    DennyW is offline CHR Member Visit my Photo Gallery
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    ....................
    Last edited by DennyW; 01-22-2020 at 03:16 PM.

  4. #4
    36 sedan's Avatar
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    Car Year, Make, Model: 36 Ford Sedan, 23 T Bucket
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    What is your fuel pressure?

  5. #5
    36 sedan's Avatar
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    Can you close the idle mixture screws completely and the motor still run?

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    DennyW is offline CHR Member Visit my Photo Gallery
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    ........................
    Last edited by DennyW; 01-22-2020 at 03:17 PM.

  7. #7
    Camaro350 is offline CHR Member Visit my Photo Gallery
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    Thanks for the replies, I will try to attach photos. As for the set up on the carb I have been messing with it so much that I donít know where anything is right now other then the floats and the mixture screws and I am pretty new at tuning a carb so that doesnít help. I have the choke set right now closed with a low temp opening. I will try running the mixture screws in and see if that helps. EDC55227-E370-472F-922D-B43959C4D630.jpg

  8. #8
    DennyW is offline CHR Member Visit my Photo Gallery
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    .........................
    Last edited by DennyW; 01-22-2020 at 03:17 PM.

  9. #9
    36 sedan's Avatar
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    Quote Originally Posted by DennyW View Post
    He said in his post that: I am waiting for my fitting to come in so I can install a gauge and see my pressure. My carb has sight glasses so I can see the float levels and they are set to just below half way.
    No disrespect meant, but we know he has an excess idle fuel delivery problem. While I missed the "waiting on a gauge" part buried in solid block of text with no paragraph breaks, my bad. However, excessive fuel pressure is a #1 suspect and should be checked first. Regardless of where the sight glass shows on a motor that won't run long enough to adjust properly.

    My second question "Can you close the idle mixture screws completely and the motor still run?" While an overly rich condition (burning eyes) could account for the low vacuum (6hg), it could also be indicative of a vacuum leak or transition slot over exposure and closing the idle screws can confirm this.

    It has always been my intention to help.
    Last edited by 36 sedan; 01-21-2020 at 08:12 PM. Reason: mistake
    glennsexton and 34_40 like this.

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    DennyW is offline CHR Member Visit my Photo Gallery
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    ..................................
    Last edited by DennyW; 01-22-2020 at 03:17 PM.

  11. #11
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    Denny, I read your statement as sarcasm, and due to a bad day over reacted, for that I apologize and will edit my last sentence.

  12. #12
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    you are in Miami .. wire the choke wide open till you figure out what`s up ..unhook and block off the fuel line with the carb full and see if it clears up before it runs out of gas ..
    Driver50x likes this.
    iv`e used up all my sick days at work .. can i call in dead ?

  13. #13
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    I realize this is not exactly a Holley Carb, but it's based on one.

    Fuel level on a Holley is set so the fuel level is at the BOTTOM of the sight hole. Above that level the carbs flood.

    If it was me I think the first thing I would do is drop the fuel level (in hot climates with todays gas I have found running the level even a bit lower to compensate for fuel expansion also helps



    .
    Dave Severson, TOW'D and Driver50x like this.
    I've NEVER seen a car come from the factory that couldn't be improved.....

  14. #14
    Camaro350 is offline CHR Member Visit my Photo Gallery
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    Okay guys, I didnít want to cause a fight, I just wanted some help. So back to what I have done, last night after the car sat all day I went and turned the mixture screws in all the way and backed them out only half a turn, opened the idle screw up a bit and tried to start it and it started instantly and ran at about 2200rpms. I let it run for about 4-5 mins and shut it off. Checked for leaks and then started it again, it was idling way too high so I closed the throttle screw a bit and it ended up dying again.

    After that I pulled number one plug and Bork scopes the cylinder and found just a tiny bit of fluid built up on the piston. I opened the throttle a little bit and it ran again but at a higher rpm, I canít get it to idle very well at regular idle but I didnít have much time to let it run and warm up though.
    Attached Images

  15. #15
    DennyW is offline CHR Member Visit my Photo Gallery
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    ............................
    Last edited by DennyW; 01-22-2020 at 03:18 PM.

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