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    1992 Mercruiser 7.4L Engines (Weird Idle, Rev, & Vaccum)

    Hi there, I have a 1992 Wellcraft Corsair with two Mercruiser Bluewater 7.4L. I have been in the process of tuning them up these past couple weeks and getting them ready for summer. Both engines ran OK last year, but this year they are struggling to stay running. So far I have adjusted the...
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    92' Mercruiser 7.4 Bluewaters Won't Idle

    Yeah, I'm cracking down on 750 right now with the screws. Almost there, I'll get another reading at true idle
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    92' Mercruiser 7.4 Bluewaters Won't Idle

    Just checked starboard, Vaccum is at 15-25 at 1200 rpm
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    92' Mercruiser 7.4 Bluewaters Won't Idle

    Ok, so I torqued down all the carb bolts, made sure the gasket was on properly, reset idle mix screws again, and they started. The port had a lot of gas in the intake, which made me think it was leaking. The starboard still needs throttle to run, but will run well. The port started up and...
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    92' Mercruiser 7.4 Bluewaters Won't Idle

    The fuel was a big problem before, new gas was put in after the old stuff was drained out. One tank is clogged and turned off right now, so both engines are running off one tank. That could also be a problem. Both tanks are full of fuel. The carburetors are from National Carburetors, in...
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    92' Mercruiser 7.4 Bluewaters Won't Idle

    Now that you mention that, that's a good test. Enough voltage to crank but not enough to spark, although they ran at one point. But I'm willing to try anything at this point.
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    92' Mercruiser 7.4 Bluewaters Won't Idle

    That's a good idea, I'll be sure to try that when I go down to the boat today. For the coil, I should be looking for jumps, or low voltage? The coil on the port side engine is new so it might not be that but I'll check on both, you never know.
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    92' Mercruiser 7.4 Bluewaters Won't Idle

    A new problem has occurred, only one wants to run at a time. Last weekend the port side wanted to run and not idle but would run with throttle, but the starboard side would not start. Now the problems have flipped sides and the port won't start while the starboard will idle with throttle. I'm...
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    92' Mercruiser 7.4 Bluewaters Won't Idle

    Yeah I need to get a Vaccum gauge on there to see, but both engines not wanting to idle doesn't make sense. I need to get a torque wrench and make sure that they are to spec. It's in inch pounds and I don't have a wrench that goes that little. Good idea though I'll check on that.
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    92' Mercruiser 7.4 Bluewaters Won't Idle

    My dad just bought 1992 Wellcraft Corsair 35'. It has two 7.4 Mercruisers that were in horrible condition after nearly 3 years of no matientence and 6 months of sitting. They were supposedly rebuilt a while ago, but it doesn't look like it. I'm on the job of getting the engines up to par, but...
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