poor performance

Discussion in 'Inboards' started by dbsupra, Jun 15, 2009.

  1. dbsupra
    Joined: Jun 2009
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Winnipeg

    dbsupra New Member

    I have a 1989 supra with a factory rebuilt PCM 351 engine with a Holley 4 barrel carb. the problem I'm having is the engine runs and performs great until the secondarys start to open then the engine boggs and will not go over 3 thousand rpm, I have tried adjusting the float level a couple of times the second time seemed to work the best but still bogged when it got into the secondarys, The engine has a distributor with points they don't look to bad Anybody have any ideas on what I should look at next, any problems changing it over to a elctronic ingnition, Is a holley card the best for this engine. There is no back firing at all it just seems that if you go past 1/2 throttle it's like pushing on a marshmellow and the boat will slow down hard on fuel.
     
    dbsupra, Jun 15, 2009
    #1
  2. Jango
    Joined: Aug 2005
    Posts: 519
    Likes: 7, Points: 0, Legacy Rep: 63
    Location: Mid Atlantic

    Jango Senior Enthusiast

    Sounds like your secondaries are not getting fuel or more likely butterflies not opening, causing too much fuel. Could be a vacumn leak.
    I prefer Edelbrock carbs (mechanical secondaries).
     
    Jango, Jun 16, 2009
    #2
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