Camry Running too Lean
have a 91 FI Toyota Camry 4 cylinder that overheated (due to no water in the radiator- ala my sister) and warped the head. I had the head resurfaced and had a valvejob, etc. I replaced the head, gaskets, and most of the valvetrain and it has been running fine for a while now (6 months+).
Recently, I've noticed a stumble off idle. It felt like it had a vacuum leak or lean surges. I didn't seem to mind at first... thinking the rings were worn (it does have 150K miles on it). Well, it's been getting worse, and now it's plain annoying.
I checked the plugs, and they are white. I checked for a vacuum leak (using WD40, then using started fluid) and there was no change in RPMs. So either I can't find it (and there's not too many places to look), or it's not present.
It does eat up oil pretty quickly, even 15W40 dries up pretty quick, but there is no smoke in the exhaust at all... cold, warm, accel, decel, uphill, downhill, nothing.
Also, when it was smogged this year, it passed... but it was CLOSE. It was 1 point under the maximum in both RPMs! So something is definately wrong.
What should I check? O2 sensor? Something else? I'm not too familiar with computer controlled cars, emissions cars, or foreign cars for this matter.
Please help.
Casey
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