Quote:
Originally Posted by Chaos
Question about Merc 4.3L MPI tune up. Is it normal to have the distributor and the plug wires changed as part of the process that is recommended every other year? Seems excessive. I figured all the smart people on this thread would know.
Thanks,
Mike
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I have a 4.3L in my bowrider. I'd replace the plugs when they start to show signs they need it. I pull them every fall and look them over. I replaced mine at 250 hours and arguably they were fine but at the time the boat was 7 years old and I figured for the cost of new plugs I'd throw new ones (NGK's) in. I still have the original distributor and plug wires in mine, my boat is now 12 years old.
I did however have to replace the distributor pickup coil (inside the distributor body), bad design on Merc's part the circuit board was not in sealed package and over time the moisture got to it and I started to have ignition problems. The replacement part was all sealed up in resin. This is a known problem and I'm not sure when that part was redesigned.