working on an FL80 with an early ISC ,8.3 CAPS engine CPL 2689. It shows fuel issues, low power, but more like the electronics aren't sending the signals, shows one code that will never clear 128 152 7 SID, boost erratic or intermittent.
I did the battery connection check and clean already.
I have an OTC 3418 code reader, never have trouble clearing codes on other applications.
the 8.3 also dies sometimes after about 10 minutes of idling, (not a idle shutdown) then acts like it has run out of fuel, on restart. bit the lift primer pump makes good pressure at key on although it does take longer to build to bypass pressure after the engine dies. doesn't die all the time.
suspecting ECM failure, but I don't want to just throw parts at it till something sticks.
Any ideas??
I did the battery connection check and clean already.
I have an OTC 3418 code reader, never have trouble clearing codes on other applications.
the 8.3 also dies sometimes after about 10 minutes of idling, (not a idle shutdown) then acts like it has run out of fuel, on restart. bit the lift primer pump makes good pressure at key on although it does take longer to build to bypass pressure after the engine dies. doesn't die all the time.
suspecting ECM failure, but I don't want to just throw parts at it till something sticks.
Any ideas??