Cliffs Notes: Replaced the injectors... AGAIN.
Longer version: About a week and a half ago my '99 developed a misfire. Check engine light, sometimes flashing, PO306 code. A quick diagnosis ruled out an ignition problem (by swapping parts around on the car, and with my wife's '96). So.. probably an injector. It ran fine when cold, but when fully warmed up, #6 would just drop out.
And off to the eBays. Where I knew to look out for fakes. Or did I? Dunno, ordered a set of 6 new injectors, described as 'OEM & Genuine Parts Only!' and 'These Injectors are NOT aftermarket' for $217. Also 'Set of 6 (6 Pieces per order) Brand New OEM DENSO Fuel Injectors'. Lol, I guess the price should have been an obvious clue. No way anyone can sell actual genuine sets of 6 new injectors for that price. Got them in the mail in shady looking little plastic bags, I forget the wording on them, but it didn't inspire confidence. And they had skinny looking O-rings - red on the top, black on the bottom. I looked them over *CAREFULLY*, and they are very good gakes. The 'Aisan' brand name, the part numbers, the casting flashes, all looked pretty good, even next to my original injectors.
I should have just sent them back (actually, shouldn't have ordered them at all), but I had my intake off and other injectors out, so I just decided to install these. Of course, the first start took a while, the fuel rails are empty, and there's no priming fuel pump pulse like some cars do. But after that, it took a WHILE to start the car whenever it had been sitting for a while. Like 5 - 10 - 15 seconds of cranking. It ran fine enough when it started, but that made me suspect they were leaking down while sitting. I drove it for about 50 miles, if anything, they got worse.
Contacted the seller, they feebly insisted these are genuine injectors, bought in 'batches of 10000 without factory packaging', but they also didn't protest much at giving me a refund, even lightly used and missing their little plastic baggies. So I sent them back, and visited the local Pick-And-Pull junkyard where a '99 arrived recently (another green 5 spd manual). And got those injectors. You can tell they don't leak because when we got down to the fuel rail and lifted it off the injectors, some residual pressure was still in the system. Not just a dribble/gush after pulled all the way off, an actual small pressurized spray as the first injector broke seal. After being crashed and sitting for, at a bare minimum, a month?
Anyhow, put those on, kept my 5 as spares. And now it runs perfectly, starts within 1/2 second of cranking, and I have to see if I get my money back on those crappy knockoff injectors.