Any ideas? If I let my '93 B2600i sit for two or more days (a complete weekend) it will start up with a persistent knock or tapping. It sounds like there is no oil on the lifters. I have seen this happen on other vehicles, but it goes away after a few seconds. This knocking or tapping will last probably a good ten minutes of freeway driving. By the time i get to work the noise is gone. Other than that my pride and joy runs like a champ. I do change my oil on a regular interval using mobil 1 full synthetic. Anybody else had similiar problems??

Most all Mazdas with any miles develop the "Mazda rattle" when started.The trucks are notorious for having oiling issues in the top end.You probably have a lifter with a plugged oil hole and it is taking awhile to pump up after starting. Drain about 1 pint of oil out, put a pint of SeaFoam in its place and run the truck for about 500 miles and see if that doesnt help. If not u r probably going to have to replace the lifter(s). BJ

My 1988 B2200 with only 40K miles did this when I got it in 1994, and it's done it ever since, especially if you let the oil level get low. Yes, they all do this. I wouldn't worry about it.

I worry about this because I tend to get challenged quite a bit on the freeway going to work. I tend to bury my needle quite a bit! :nono:

Well, if u r driving the truck that hard,try the SeaFoam and see if that helps. If not, continued use of a truck with a collapsed lifter will eventually lead to valve and/or camshaft failure. So u really need to fix the truck. Lifters are not all that expensive but the labor is>Lol. BJ

yah really! thank goodness that I do my own labor, LOL. that seafoam does wonders on the fuel system, night and day difference! I will try it on the motor oil and see wht happens-----------thnx

L8RS