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  1. O

    Mercruiser 5.7 won’t make power

    Honestly I can’t tell, either my light is messed up or something is wrong, I was hoping I did something wrong and that’s why I asked if the idle changes when you put in the jumper. At idle about every fifth pulse the light is way off, and the light is very erratic , I checked spark between cap...
  2. O

    Mercruiser 5.7 won’t make power

    If it’s electronic ignition. What could be wrong with the dizzy? I’m leaning that way but don’t know enough about them, I thought the electronics self timed, it does have a large mechanical head under the rotor button but I’m not sure what it’s for
  3. O

    Mercruiser 5.7 won’t make power

    Thanks I will try it
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    Mercruiser 5.7 won’t make power

    I used a compression gauge to put me on tdc, and watched the valve to set nbr 1 I just got back and it held a steady 4 psi even when I manually opened the secondaries, and spray pattern was even It has two hours on the test stand with varied idle and about 5 hours in the water now
  5. O

    Mercruiser 5.7 won’t make power

    I have one with me I will, where is the best place hook up the vacuum line, I have it but have never used one
  6. O

    Mercruiser 5.7 won’t make power

    Last thing the flappers are banging like hell almost sounds like a engine knock but it is the flappers, if they are knocking that means they are letting the exhaust go by correct?
  7. O

    Mercruiser 5.7 won’t make power

    So I’m on the lake now and put in in base timing and set to 8 degrees. Go out to run it and 12 mph at 2200 rpm is all I can get. I put the timing plug back in and rotate the dizzy while going down the lake, almost 1.5 inches to the right until max rpm of 2600 achieved any more it ran like crap...
  8. O

    Mercruiser 5.7 won’t make power

    When I put in the timing plug on the distributor shouldn’t the engine rpm change? I start and warm up the engine, idles 800 warm, plug in the timing jumper and ensure that the 12v wire is hooked up to battery power all while engine running, but the idle does move
  9. O

    Mercruiser 5.7 won’t make power

    On the 3.0 I used the 1.98 drive 16” 13p prop at 4600 rpm
  10. O

    Mercruiser 5.7 won’t make power

    The edelbrock was the only new unmolested carb I could get that day, once I figure out this issue I will slap the Holley marine carb back on since it appears nothing was wrong with it
  11. O

    Mercruiser 5.7 won’t make power

    I am about to check it again this morning to make sure it is still advancing
  12. O

    Mercruiser 5.7 won’t make power

    I have a 1.47 ratio drive how does that calculate?
  13. O

    Mercruiser 5.7 won’t make power

    Yes I used gps, top speed is 17mph, the 3.0 engine I got 23 mph out of the same boat.
  14. O

    Mercruiser 5.7 won’t make power

    How much would the cam placement effect the performance?
  15. O

    Mercruiser 5.7 won’t make power

    Lol yes I finally did today, I sucked up my pride and verified rotor cap plug wire placement
  16. O

    Mercruiser 5.7 won’t make power

    I did try a 14.75” 15p prop and the rpms were identical which I thought real strange, I was expecting at least 600 rpm difference. Yes I am running a 1” spacer, the original carb was a 4160 spread bore 600 cfm. The edelbrock is Avs 2 1906, yes is a car carb but I wanted to throw something on...
  17. O

    Mercruiser 5.7 won’t make power

    The pump is 50 gph Carter p4389, 3/8 fuel line, the hoses to the tank are brand new, and the tank was pulled out and cleaned prior to being installed, and the flow is great , I used a bucket to catch it.
  18. O

    Mercruiser 5.7 won’t make power

    Bear with me I will give all the specs first. Boat is a 24’ Tritoon with an I/o set up. Came factory with a 3.0 but I shoes in the 5.7 and everything as far as mounting was done correctly and is properly lined up with the drive. The drive is a alpha gen ii , I bought a new upper unit from sei...
  19. O

    5.7 harness modification

    Thanks I didn’t catch that
  20. O

    5.7 harness modification

    I have a 1998 vortec 5.7 with Holley 4 barrel 4175 series electric choke that I just rebuilt the engine and carb, it will have a alpha one gen two drive going in my pontoon. The harness I have was severely hacked so I am going to build a new one from the remnants of the old one. My engine does...
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