ABcomanche04 Posted December 12, 2013 Share Posted December 12, 2013 have a 1989 Comanche 4.0 and my vehicle was running fine then died. so when I got it back to the shop I was unable to figure out the problem. so I replaced the computer that was under the dash and that didn't fix it so I have spark and fuel up to my injectors but when I tested the fuel injector for power it only has .37 volts. any ideas?? Link to comment Share on other sites More sharing options...
kq.echo.413 Posted December 13, 2013 Share Posted December 13, 2013 Check all ground wires?? Link to comment Share on other sites More sharing options...
metrictonner Posted December 14, 2013 Share Posted December 14, 2013 Sounds like "old car" electrical problems. When you replaced the ECU did you by any chance let it dangle on the side of the transmission hump while you tried to start up or did you do a complete reinstallation before you tried to start it up? As the electrical connectors age the female contacts inside them open up and have to be reformed (crimped) periodically. You can generally discover this by diddling with the harness wires running into the 201 and 202 connectors of the ECU while you crank your engine or if it starts, after it is running. If strange things happen you have loose, open contacts inside the connectors. The 201 and 202 connectors are especially vulnerable because of the sharp angle they make when installed. They do not age very well. But, you know, after 20 or 25 years all of the electrical connectors will tend to open up. That is why the Renix manual makes special notes to not only check the parts but check the connections, especially to the ECU. Link to comment Share on other sites More sharing options...
ABcomanche04 Posted December 16, 2013 Author Share Posted December 16, 2013 I tried starting before installation. I wiggled all connectors to check and see if any were loose or corroded also. I didn't manage to see any problem with the conections. Link to comment Share on other sites More sharing options...
carnuck Posted December 18, 2013 Share Posted December 18, 2013 Are you sure you have constant spark? A single arc with the key on/off but nothing else says bad CPS. Link to comment Share on other sites More sharing options...
cruiser54 Posted December 18, 2013 Share Posted December 18, 2013 I tried starting before installation. I wiggled all connectors to check and see if any were loose or corroded also. I didn't manage to see any problem with the conections. Click on the link in my signature and do the complete ground refreshing and connector refreshing before spending any more on parts that may not be needed. Don't skip any steps and be thorough. Link to comment Share on other sites More sharing options...
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