bdcurnutt

You're probably right about the lack-of-chip. I've seen a picture of someone who tried to clean the MAF based on instructions and pulled all the connectors out. I might have too if I hadn't read about how many people had done it.

I'll check all out again tonight. I'm a little afraid to remove the top, but if it's failing/failed anyway, it can't hurt and I can always glue to the top back on (as many other have had to do unintentionally).

Thanks!!!

bdcurnutt

Update: After disconnecting the battery and clearing the codes, I rechecked the resistance on the terminals on the AFM and they were all within spec. However, after a couple of engine restarts, I rechecked the codes and found 24, 31, and 32, which is also a related code.

With the resistance being in spec, is it possible (you alluded to it) that I have a wiring or ECU problem? It's running okay; not great, but okay. It was hesitant to start but it's still pretty warm even after a couple hours from the drive home; although it's still in the 90s at 10:00pm so the cool down is slow. I still think it's strange that it starts easily when it's cold.

bdcurnutt

Two years later...

Still have the '92 4Runner 4WD (in Dallas). After replacing numerous parts over time, I found a faulty connection at the fuel pump (on the outside). Very frustrating after replacing a lot of parts, although some clearly were ready; ex. fuel pressure regulator.

I'm about ready to sell it and wondering if you'd still be interested. In full disclosure; after getting everything in good shape, it overheated and I realized it had finally experienced the infamous head gasket problem. It was leaking into cylinder 6 and into the oil passage as well. Over several months of letting it sit and occassionally trying different brands of "head gasket in a bottle", Blue Devil seems to have worked. The others (Rislone and K&W w/Kevlar) didn't hold. I've got about 150 miles on it right now and am driving it to work every day (about 25 miles/day). I'm about to turn over 210,000 miles.

I wouldn't trust it yet on a long trip, but I'm getting more confident each day. Ultimately it needs new head gaskets and could need the heads shaved. The cheapest fix is to pull the heads and get them shaved locally and put it back together. The next deal (easier) would be to buy remanufactured heads (ready to mount) at Autozone or online. Autozone has them for about $400 each, so two and a head gasket kit and you're done, unless someone wanted to redo the rings while that far into it. I'm brave enough to do it myself now, but with six cars in the family, I'm never done working on them and this is a "back-up".

It actually looks great and is very clean. Let me know if you'd like more info or know anyone else who would.