sticksnstones

Thanks all for replying to the thread revival. My 4wd 22re currently has 235k and is my daily driver. This noise really became evident somewhere around the 180k but then went away almost instantly, now it requires a little more patience for it to warm up. I got the truck at 160k. PO's didn't completely beat the ˟˟˟˟ out of it but certainly wasn't babied, and delayed a lot of maintenance until I got it. Was ran it's life on conventional 10w-30 until I got it. I rotate around 5w-40 and 10w-30 Full syn HDEOS Can't imagine ever trying to explain this to a potential buyer who isn't used to the non modern vehicle characteristics, fortunately I've learned to accept these quirky aspects. Better than the pinging I'm dealing with currently!

Jimkola

I never saw the 22R piston slap be a precursor to any failure, but engine ping is another story. Have tried different gas/higher octane?

Blueman

My truck gets fed 89 octane (mid-grade) or it'll ping under high load.

Jimkola

If you buy a "Top tier" gas you could very well get by with 87 octane, while some of those off brand gases may cause ping with their so-called high octane. Pinging can break rings and be hard on the bearings, so worth finding a brand/octane that will eliminate it.
If you're using any sparkplug other than Denso or NGK I'd get rid of them now.

ToyoDerp

If I remember correctly, the owner manual says to always use 89 or higher in this generation of trucks. I've used 89 or higher all of my truck's life and don't think it ever pinged. I put high octane in when expecting heavier loads in higher heat.

I actually find my 22re runs best on a 50/50 mix of 89 and 92 octane, but that's more of a hassle to do than I feel like doing. LOL

bjmpepper

Reviving an old thread to share my experience. My 1987 22RE had 250K on it with substantial cold piston slap. I recently had it rebuilt by a reputable engine builder; and unfortunately, it still has cold piston slap (albeit much less than before). Like before, the noise is apparent under slight load and goes away after a couple minutes of warmup. The new pistons are cast Sealed Power pistons with Teflon-coated skirts. Wall clearance is 0.002". If I had to do it over again, I would try hyper-eutectics with 0.001" clearance. TSB 023081586 (August 1986) acknowledged the issue by revising the piston design with a reinforcement rib. I suspect that many people experience this, but either don't realize it, or don't care. Good to know it's not worth worrying about.

Melrose 4r

what was done to your block in the rebuild? Overbored or just honed?

Jimkola

You’ll have very poor luck in trying to eliminate that sound. We tried when it first happened, even rebuilt a few engines. Toyota finally deemed it a normal characteristic. The general consensus was the slap was from a fairly long stroke, combined with a piston skirt that was a bit short. As the piston went up it’d rock to the side causing the slap sound. As the engine heated and things expanded it greatly diminished or go away completely. We never saw an engine failure or issue around the sound. Annoying though. Oddly, it wasn’t consistent with all 22R# engines, much like the temperature overshoot and the dual thermostats. Some did it, most didn’t.

bjmpepper

Bored 20 over.