2010 Tacoma 4x4 4.0
What are your thoughts on this issue? The truck goes to the dealership this Friday, however, I’m curious to know if anyone has experienced the same issue and if so, what was the cause and fix. I’d like to have a bit of knowledge behind me before Friday; the dealerships have a tendency to pass off problems as, “Working as designed.”
At low speeds (under 35 mph) and low rpm’s (under 1,500)with trans in OD the engine has one hell of a spark knock noise when driving around the neighborhood or through traffic. The spark knock is also noticeable at highway speeds when passing under hard acceleration. It’s only in the 40 –65 mph cursing range that I don’t hear the spark knock. I changed the plugs at 30,000 miles with genuine Toyota plugs; however, the damn spark knock was still present. At 34,000 miles I again changed the plugs to NGK, no luck, the spark knock is still present. Each time the plugs were gapped at 41mm to 42mm.
I used the higher-octane fuel 89 and 93 grades, no help.
Its not the ticking noise omitted from the driver's side top of the engine, this is a loud spark knock noise, like bingo balls in the engine. This problem started at approx. the 28,000 mile mark.