end of the summer motor problems
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 14 of 27

Thread:
end of the summer motor problems

  1. #1
    Broke Member monstertahiti78's Avatar
    Join Date
    Feb 2012
    Location
    Folsom, CA
    Posts
    386

    Default end of the summer motor problems

    I dont even know where to start.....I had to replace the gas tank in my 74 Tahiti (455) due to rust on the bottom of the original tank. Once replaced I took her out for a test run and she started bogging down at low rpm. Almost seemed like some carb adjustment or timing. (Which was interesting because it ran great before I put the tank in and I did not touch the motor at all). If I kept the rpm about about 2000 it ran perfectly fine. Any less than that it would make a very low popping noise and run like shit. So I parked the boat and it sat for a couple of weeks until I had some time to work on it. Finally got around to working on it and fired it up to show my pops what it was doing....and of course it ran just fine. no issues at all. since I was already in the tuning mode I pulled the plugs (cleaned and re-gapped), checked and cleaned up rotor, checked dwell, and adjusted idle. From that little bit of tuning she was running better than ever or so I thought. I took her out to the river a couple of days later and spent about hour cruising around with no issues at all. Then out of nowhere I started hearing the low popping noise again but this time is was not at low speeds this time. Now it was happening when I got it up to around 2200-2300 and ran totally fine at low idle rpms. And when I got it up to around 2300 the motor was shaking back and forth pretty hard. Puckered my a$$hole a little bit. My first thought is a fuel issue. Maybe clogged filter or something in the line. I havent had a chance to dig into it just yet but I thought I would put some feelers out there and see what you guys thought. Motor is all stock 455. Thanks for the help in advance.

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member carreradude's Avatar
    Join Date
    Dec 2008
    Location
    Rancho Cordova. CA
    Posts
    649

    Default

    I would bet some of that rust is in the filter (s). Possibly in the carb as well.

  4. #3
    Broke Member monstertahiti78's Avatar
    Join Date
    Feb 2012
    Location
    Folsom, CA
    Posts
    386

    Default

    Quote Originally Posted by carreradude View Post
    I would bet some of that rust is in the filter (s). Possibly in the carb as well.
    Im thinking the same thing. Of course all of this happens after I sold my whole fuel system off of the last boat. Where in Rancho are you located? I live in Rancho as well.

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member LuckyDaze's Avatar
    Join Date
    Apr 2008
    Location
    Tacoma Wa
    Posts
    1,409

    Default

    Id flush the lines and pull the float bowls to see if you have rust in the carbs plugging it up.

  7. #5
    Senior Member
    Join Date
    Jan 2012
    Location
    St. Louis, MO
    Posts
    112

    Default

    The fuel pressure gage is your friend....

  8. #6
    Senior Member DuaneHTP's Avatar
    Join Date
    Dec 2007
    Location
    Shell Knob, MO
    Posts
    1,379

    Default

    All of the above posts were good things to look at. If that's not the answer, does it have an HEI distributor in it? Check the wires running to the module if it does.

  9. #7
    Broke Member monstertahiti78's Avatar
    Join Date
    Feb 2012
    Location
    Folsom, CA
    Posts
    386

    Default

    Quote Originally Posted by LuckyDaze View Post
    Id flush the lines and pull the float bowls to see if you have rust in the carbs plugging it up.
    The old boat had a Edelbrock on her and I went threw both the carbs a handful of times. With that being said I have no problem going through a Edelbrock but I have no idea what im doing with the Holly on the new boat. I would assume it cant be much different. Ill probably dig into it on Saturday and see what I come up with.

  10. #8
    Broke Member monstertahiti78's Avatar
    Join Date
    Feb 2012
    Location
    Folsom, CA
    Posts
    386

    Default

    Quote Originally Posted by mpkardell View Post
    The fuel pressure gage is your friend....
    No fuel pressure gauge on this setup but it may need to be added for personal comfort this time around.

  11. #9
    Broke Member monstertahiti78's Avatar
    Join Date
    Feb 2012
    Location
    Folsom, CA
    Posts
    386

    Default

    Quote Originally Posted by DuaneHTP View Post
    All of the above posts were good things to look at. If that's not the answer, does it have an HEI distributor in it? Check the wires running to the module if it does.
    No HEI on this setup. Stock points.

  12. #10
    Senior Member
    Join Date
    Nov 2009
    Posts
    1,299

    Default

    Quote Originally Posted by monstertahiti78 View Post
    No HEI on this setup. Stock points.
    Ballast resistor!

  13. #11
    Senior Member 1975sleekcraft's Avatar
    Join Date
    Jun 2008
    Location
    seattle
    Posts
    393

    Default Vent

    Just a thought...you change gas tanks...is the new one Vented Properly??
    75 Eliminator

  14. #12
    Senior Member
    Join Date
    Dec 2007
    Location
    New Jersey
    Posts
    307

    Default

    Quote Originally Posted by monstertahiti78 View Post
    No HEI on this setup. Stock points.
    Do yourself a favor and upgrade to electronic ignition. Points were okay when we had nothing better. I think you can do a Pertronix conversion for not a whole lot more than a new set of points and condenser and the Pertronix works well. Or if your budget allows there are all sorts of distributors from MSD and Mallory, DUI etc. Even if it is not the problem this time you have just enhanced the performance and reliability.

    Doug

  15. #13
    Broke Member monstertahiti78's Avatar
    Join Date
    Feb 2012
    Location
    Folsom, CA
    Posts
    386

    Default

    Quote Originally Posted by 1975sleekcraft View Post
    Just a thought...you change gas tanks...is the new one Vented Properly??
    I think it is....vent tube to the side of the boat. I reinstalled the new tank the same way the old one came out. Is there something aside from the vent tube that I should have done?

  16. #14
    Broke Member monstertahiti78's Avatar
    Join Date
    Feb 2012
    Location
    Folsom, CA
    Posts
    386

    Default

    Quote Originally Posted by Real McCoy View Post
    Do yourself a favor and upgrade to electronic ignition. Points were okay when we had nothing better. I think you can do a Pertronix conversion for not a whole lot more than a new set of points and condenser and the Pertronix works well. Or if your budget allows there are all sorts of distributors from MSD and Mallory, DUI etc. Even if it is not the problem this time you have just enhanced the performance and reliability.

    Doug
    I agree. I had a MSD on the last boat and I loved it. The only thing is that I cant see putting anything more performance wise into this 455. I havent touched the boat mechanically since I bought her(up until the recent tune up) and she ran great up until this point. Super reliable all summer. I really like the reliability of this boat but the reality of it is that its just a starter boat for me. I think if I start throwing money at a motor I want to do it to a 454.

+ Reply to Thread
Page 1 of 2 1 2 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in


Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95