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Long story short, I have a 1995 Toyota Pickup DLX 4x4, v6 mt. In March, I had a newly rebuilt 3VzE engine dropped in after the old one suffered a catastrophic head gasket failure (imagine that?) My mechanic repinned the VAFM connector with a new one, as the old one was broken and wouldn’t stay put. The truck ran well, other than a slight hesitation when cold and what I believe is a rich condition (exhaust tip is black inside and exhaust is strong like raw gasoline) A couple of weeks ago, it suddenly died while driving and wouldn’t start. They replaced distributor and ignition coil which at least got it started but now it surges, almost stalls, and hunts for idle when when it’s started. They determined that the problem was somehow related to the AFM. That said, I pulled and tested AFM and everything measured to spec. To be on the safe side, I bought a used AFM but that tested out exactly the same. I decided to double check the connector and this is what I found: The connector was pinned in reverse. Wire 1 is on terminal 7, wire 2 on 6, etc. the only correct one is 4. My question is, how the hell did this thing run at all like that? Do you think it caused any permanent damage? And will terminating it properly fix my rich condition and idle issues?
Check out the actual connector against wiring diagram:
Well, that connector does not look at all like my VAF connector. So I wouldn't rely 100% on numbers molded into the casing. You're practiced at electrically testing VAFs; do the pins you test correspond to the numbers on the connector body?
The VAF function that would cause the most trouble is FC. If FC is actually connected to VS, that might provide just enough of a ground to close your COR and keep the engine running.
Jul 30, 2020 | 08:32 AM
