how to accurately test ECM?
I put did a TBI conversion on a crate motor and put it in my 72c10.. it was running great for about a year and then starting to have phantom intermittent problems during acceleration. Went through every wire, rebuilt TB, every vacuums tube, consistent fuel
pressure, two fuel pumps and redid intake manifold twice.. No error codes are present. I cannot find the problem? Now I have given up and took it to a local shop.. they are hesitant to look at it because of the custom wire harness for tbi.. they are now telling me that they suspect the ECM to be faulty. I appreciate their effort but I feel that hey are guessing the the problem and not providing evidence as to the cause? I do not have a spare ECM lying around to do a test swap. Does anybody have a known method to test tbi ECM? It is a 1227747. Or possibly any other info or ideas. I have given up. Thanks, Tyree
1 Attachment(s)
TBI poor accelleration/bogging log
I am confident that nothing is mechanically wrong. I again tested my fuel pressure and it is a consistent 12 psi and I also removed my new in line filter to quadruple check that fuel was not being restricted. I got 12 psi at idle and also at Wide open throttle. I took the truck a few blocks away and went down the main straight away to stomp on it. I was not able to get above 2000 rpms without the truck wanting to die on me and it was bogging. I took a log. If anybody can review the log and see for anything that would be great. I do not know too much about the log to interpret for myself. Thanks