Eicca

Well the results are in. Coolant leaking into the cylinder(s) when the engine is off. Cracked block or head gasket. If anyone wants a blown-engine 1999 that's in well-used-but-otherwise-maintained condition, we'll probably just sell it to...

To test fuel pressure, you need to add a banjo bolt like this with a 1/8 npt hole on top to the front of the fuel rail along with a fuel safe schrader valve for most fuel pressure gauges. https://www.amazon.com/dp/B000CPJI8I?tag=ihco-20

Didn't get to do the fuel pressure test cuz apparently there's no good fittings on this engine that work with the rental tool I got. The plan now is, since this thing was going to the shop for AC work anyway, we're gonna have them do all the...

Many good suggestions. Thanks for all the input, will run the compression and fuel pressure tests and report back.

In that case you might want to do the compression and leak down tests before you try new injectors, just to rule out internal engine problems. I'd run the compression test dry and wet for each cylinder. If one cylinder is low on compression, the...

Just to verify I understand what you are saying, after a reset runs great and then runs poorly after being shut off? The fact it runs well after resetting the ECU, makes me think it is learning something from either a bad sensor or a bad signal...

Coil was already swapped with a brand-new Denso from RockAuto. I also moved coils and plugs around between cylinder. No change with that either.

Mine did not run like crap at all when the engine was up and going, but they 100% leaked after shutdown and caused a startup stumble most of the time. Your engine is clearly getting too much fuel or not enough air as evidenced by the negative...

Man if mine are counterfeit they’re dang convincing. The one in your photo is obvious. The ones I got look identical to the real thing, down to the plastic casting lines and all. I still have this itch in my head that if they were counterfeit...

I broke most of the connectors trying to get them out of the fuel rail :cry: But I have swapped every possible variable of ignition in that cylinder: plug, coil, injector, nothing made a lick of difference.

The thing that hangs me up on this thought process is the fact that it runs flawless for the first drive after an ECU reset (and the original problem of the cylinder 3 misfire didn’t change at all)