I am only guessing but it seems to me an ECU that can't remember anything is probably faulty.
Inside the ECU or ECM, the brain, the computer can be divided into sections like the circuit board of a radio or a laptop. There will be voltage regulators, an obd interface, a memory for the fault codes and a memory for recent history and a memory for the learned settings. There will be a memory for the preprogrammed settings and drivers for the ignition and injection system and an active computer making sense of the sensor information in order to make constant adjustments.
Just as with most things built on a single circuit board they rarely fail en masse. Usually what happens is just one of the on-board systems fail even though the result for practical purposes is the same as if the whole thing frazzled.
Usually When an ECU fails it is one of the essential functions which leaves no doubt it must be replaced but it isn't inconceivable that any section could fail - even one or more of the memory sections...
SOURCE: my car just failed smog emissions test, had high
i would put a good tank of gas in the system. like 93 super.drive the car for about 1 week or at least 100 miles. i would also go to a good auto parts store.u should be able to buy a bottle of engine cleaner to pass the smog test.also when u bring the car in for the inspection.take it for a rideand get it nice and warmed up.
SOURCE: Got Tune Up, but failed smog because Check Engine light is on.
I take it your talking about "check engine" light. Have you tried disconnecting battery for a minute or so? If light comes back on, try cycling your key just to "On", off, on, off, on & then leave in "On" position (not start) & count flashes of check engine light. Will be 2 digits, for example: 3 flashes, pause, 3 more will be code 33. 2 flashes, pause then 5 flashes would be code 25. Write them down & lets see what you get,and let us know. code 55 means end of message.
SOURCE: I have an 1989 Plymouth Voyeger Starts when it feels like it
Have you tried cycling key for fault codes? Turn ignition to on (not
start) then off, then on, then off, then on, leave it on, and count
flashes of check engine light.
flash,flash,pause, flash flash, is
code 22. 3 flashes, pause, then 5 flashes, would be code 35, etc. See
what you get, & get back to us with them if you need more help, and please include what engine you have in the van.
SOURCE: Misfire in 97 voyager,P0300 and P0304,HELP! Need 2 get inspection
I'd have fuel pressure checked, and at the very least, replace fuel filter. Not unusual to get multiple misfire codes due to low fuel pressure, thus starving cylinder(s), and causing the misfire code(s).
SOURCE: I need a manual for an 87 Plymouth Caravelle. I
Just follow your exhaust manifold from engine to where it connects to exhaust pipe. It should be right above that, threaded in to exhaust manifold.
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