Hi all,
I've scoured the archives and read everything in the 700-900 FAQs (all good stuff..but to no avail.). The car starts fine, but within minutes begins to stumble and blow black smoke, especially under hard exceleration. The check engine light comes on within minutes after reaching cruising speed. The codes are: 2-1-3 (throttle switch faulty at full throttle), 2-2-1 (fuel system compensating for rich or lean mixture), 1-1-3 (fault in fuel injectors).

WHAT I'VE DONE SO FAR:

1. Replaced 02 sensor (weeks ago the OBD indicated it was bad)
2. Replaced Fuel Pressure Regulator and spark plugs(seemed to work...for about 50 mi.)
3. Replaced ignition wires, cap, rotor.
4. Checked the Coil (Bosch)
- Primary Resistance: 1.2 ohms
- Secondary Resistance: 7.4k ohms
QUESTION: Does my vehicle have a Breakerless, Computerized, or EZ-116k ignition system? I'm guessing its the EZ system because the PR is just 0.2 over spec, and the SR is right in the middle of spec.
5. Listened to Injectors (all are clicking the same)
6. Removed and Cleaned the Throttle Body (my dentist wishes I'd brush this well)
7. Throttle Position Switch passes the "click" test.
8. Currently running a can of BG44K through it (this and gas in oil reduced viscosity to near water....changed it out today).
9. Performed my first Compression Test (fun!):
- #1 180 psi, #2 179 psi, #3 180 psi, #4 180 psi (waited until guage didn't rise any higher in each cylinder). These values are impressively consistent and about 6% above the 170 psi spec. I suspect carbon deposits from rich burn (when I pulled the new plugs to test compression all were equally blackened with soot.)

RUNNING OUT OF MULTIPLE WORKING HYPOTHESES:
1. Could it be the coil? (need to know which system I've got.)
2. Could it be worn injectors - either leaking or opening too early and for too long (I've ordered new ones because after 150,000 miles they've got to be tired)
3. Could it be the Throttle Position Switch (maybe it's worn out)
4. Or could it be the ECT sensor? What I've read indicates when it fails it tells the ECU the engine is cold and wants more gas (is there a code for this?)

Given that the cylinders have good even compression and ALL plugs are equally fouled, I'm leaning toward the ECT. I doubt all four injectors would fail equally within a month...something seems to be telling the FI to spray extra fuel at all times. Have read about Base Idle Setting impacting driving performance, but idle seems to be set correctly....just stumbling and missing due to too much fuel.

FINAL WEIRD NOTE: When I pulled the fuel pump relay and main fuel pump fuse to relieve the fuel line pressure by idling the engine until it stalled I cut the grass for an hour and when I came back it was still stumbling along and puffing rich exhaust smoke. Huh???? This made me think the injectors were really leaky and engine vacuum was sucking fuel through them. Or, perhaps there was so much gas in the oil the engine was sucking and burning crankcase fumes. It wouldn't die!

OK...Sorry for the length of this...plenty here to chew on.
Jon