Join Date: Apr 2002
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Pinging when wet
What would cause pinging [detonation] under acceleration when the engine gets wet?
I was wheeling yesterday in a mud pit and took some water up to the grille. I had my fun and on the way out it started to crap out. I made it out fine, but got about 100 feet and died. I pulled the K&N out and luckily the top was dry and clean, but the bottom was soaked and covered. Fired up and drove to camp filterless, running shi**y. Pulled the dist cap and had some water in there, so dried it out and cleaned the contacts. Ran ok on the 40 mile trip home, but started pinging a bit about half that way. Also experienced the hard-cranking syndrome typical of timing problems.
I took everything apart after I washed it. Cleaned the air intake tubes, airbox, dist cap, and noticed some fuzz on the tiny air meter filaments, so I carefully cleaned those too.
Runs great today with no pinging or ill-effects. Any ideas what caused the pinging? Residual water in the intake tubes making its way into combustion? Or water in the dist cap?