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`72 Evinrude V4 Problem
K. Smith wrote: Chehalis Jeff wrote: Hi I know you guys like to argue a lot about politics, but perhaps you could take a moment to help me out with my problem, and here it is: I have a 1972 Evinrude 85HP V4 Outboard that has been running fine until it overheated (didn't seize) when the water pump disintegrated. After the WP came apart, pieces of it messed up the thermostat (or whatever it is OMC calls it) so I fixed that and the cooling system works. I took the boat out for a test run and it starts good, idles good but when you give it full throttle, it seems like the ignition is severely missing -but only under load- because as soon as the boat gets on plane, it seems to run fine. It's like spark is jumping to ground (somewhere other than it should) on one or two cylinders when under load. I inspected the Spark plug wires and the coil wire and I don't see anything obviously wrong. I ordered some new wire and new plugs (old plugs look OK, perhaps a touch blacker than they ought to be, like it's running a touch rich) I looked into the spark plug holes and pistons look good and compression is pretty even on all four cyl. I haven't put in the new wires (waiting for them to arrive UPS) or plugs but I wondered if anyone else has seen this behavior before. Thanks JM Chehalis, WA HI JM As others have said a good tune can't hurt, new plugs, check leads etc. Sorry to be the odd one again but feeling here is you might have a head gasket/joint leak so once water really gets flowing it kills a cyl or cyls from firing. Below is a paste of a very old prior post which should help you tune it if you want without spending. K But he said all cylinder compression values were very close. If they aren't leaking down, then how is that water getting in? |
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