Truck has done this 3 times now. Its only done it going up hill since thats when it downshifts and holds the lower gear for longer. But here it goes:
Driving uphill, doing 70-75 and it downshifts to 4rth Id assume and RPMs jump to 4000. After about 1-2 minutes, I get a tapping sound coming from the passenger side. As soon as I let off the gas and coast a lil bit, noise goes away. Ive parked as soon as this happens and noise is gone.
Its not pinging, not sure if Im losing power since I let off the gas as soon as I get that noise. No CEL, running motorcraft 5/20 and motorcraft filter...temps have been mid 80s and truck isnt overheating. Only does it when revved up for a while...cant duplicate it parked cuz of the rev limiter.
Could this be a dirty/sticking lifter? Any known fixes for this? I dumped some Marvel Mystery Oil in the crankcase hoping it helps. Anyone run into this before?
05 3.0 4dr Edge, Roush signal mirrors, Tremor Sound System, Taurus e-fan, Explorer Sport buckets and console, OHC and lighted visors, Raammat sound deadener and stockinteriors carpet kit.