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-   -   Bad tach causing a miss on an hp500 Carb engine (https://www.offshoreonly.com/forums/general-q/331317-bad-tach-causing-miss-hp500-carb-engine.html)

PurdueCAT 10-03-2015 07:23 AM

The engines are 1999 model electronics/wiring. I do have the knock sensor setup. I pulled the cap yesterday and ran some fine sandpaper over the ignition sensor. After restarting it after this it seemed to idlena hair higher and smoother but this may have been a flook. The miss was still there. I'll check some more things out here when it gets light out and go from there.

PurdueCAT 10-03-2015 10:44 AM

Swapped coils and now it runs as smooth as a babies ass. I've never had a coil partially fail. It's always been all or nothing. Coil had a "98" on it which I can only assume was a year of manufacture, so I guess it shouldn't be a surprise that it was failing.

BUP 10-04-2015 02:50 PM

Thanks for the update. Posted what I did in post # 9 as I really thought your problem was ignition component related. Like I said cap, rotor, ignition sensor and coil basically have become maintenance items these days.

PurdueCAT 10-04-2015 03:25 PM

It really sucks but thats what its come down to I guess.... Either way, a coil is alot cheaper than alot of things!


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