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Hello, glad to know you are still out there and keeping us posted.
I need to ask how long has the car been sitting before trying to revive it? It appears it was at least long enough for at least one battery to go bad. Bad batteries raise havoc with computer systems too!
If the car has sit for more than three months the gas starts to go stale but not necessarily bad. This is subject to environmental changes. Barometric pressures push air in and out of a tank or container. Temperature changes double down with gasoline vapors.
If the quantity of gasoline left was very low, the more the gasoline is exposed to air above it. Consequently the more it will oxide away, leaving a gummy substance behind.
The good news in all of this, is the fuel tank got filled and it may reconstitute the old stuff back into a liquid but that junk will be a lower octane value.
When you said the filter was very dirty are you meaning gelled inside as if you cut it open or was it just dirty on the exterior with grime?
The likelihood that the injectors have clogged screens is unlikely to happen in all four injectors. Gel can form inside but there is not much air in the lines to cause a great quantity of it in short periods of time.
If one has varnish on a pintel it could cause a real slow fuel rail pressure leak down but more likely a spray pattern problem. Rough idle but not shutting down. It breaks down to recognizing symptoms in sequences.
Again check the cylinders or plugs for excess gasoline before a first start and plug burning stories.
If any of the above has happen the main fuel pumps check valve may have trash in it. This would cause insufficient fuel amount or no rest pressure overnight. It takes a lot of cranking to get things caught up or refilled when the rail gets STARVED. The engine has to keep turning to keep pumps running.
Just turning the key and hearing the pumps run, on the ECU time out is not conclusive.
This is why I suggested keeping the pumps running while checking and running the engine functions. Fuses 4&7 are the ones. I just learned this from Art on a late production '93's.
It would be nice to know if the rail in filled with some amount of pressure for a half an hour after shut down.
Letting the pumps circulate the gas through the system will help clear lines up but you better have a good battery in the car. With them running it's like leaving a fan running or even headlights on.
Do you have any idea how old the pumps are or if the main pump is really loud? A moderate hum or low whine and almost not noticeable is considered normal.
That's about all the ideas I can think of right now. Just mull these around while you are testing. Take notes on what it does and when will help a lot when posting.
Phil
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