I could probably write a book on this, but I'll try to keep it as concise as I can.
The victim: 95 legacy wagon, ej22, auto, awd, 250k miles
Intermittently stalls/dies/sometimes just hiccups. - Happens every couple of days most often after a hot soak. So far, will restart immediately.
There is a relay repeatedly cycling on and off under the dash- only when in gear, seems to cycle faster as speed increases. Fairly certain it is not the fuel pump relay or main relay, clicking.
No codes in ECM. On one occasion, TCM set code 23 (engine speed signal).
Driving along with a code reader connected, reading live data, it will sometimes loose communication with the ECM. This is sometimes, but not always, followed by a hiccup/stall. Code reader does not seem to lose power.
Tried so far: Swapped coil, threw a crank sensor at it.(cheap, why not...) Cleaned up as many grounds as i can find. Fuel pressure +-32psi-( need to rig up the gauge so I can monitor while driving). Battery & alternator test good.
I have a hunch that the ECM is beginning to get flaky. I say this because even if I start unplugging sensors, it will not set any codes. (except for the TPS) Just wondering if I'm missing something obvious.
Any suggestions/advice greatly appreciated.
Edited by Silent Bob, 27 April 2014 - 03:38 PM.