Bad tach causing a miss on an hp500 Carb engine
#11
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Joined: Jul 2013
Posts: 232
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From: West Lafayette, Indiana
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.
#12
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From: West Lafayette, Indiana
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.
#13
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Joined: Jul 2011
Posts: 9,594
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From: Ft. Worth TX
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.



