ECU Substitution?, Using 1974 ECU in a 1973 |
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ECU Substitution?, Using 1974 ECU in a 1973 |
ThinAir |
Jul 16 2020, 10:44 PM
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#1
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Best friends Group: Members Posts: 2,543 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region |
My stock 1973 2.0L has developed a problem. Intermittently, the engine will start stumbling and then die. Sometimes reseating the 14 pin connector/harness on the relay board will get things going. Other times I have to just let it sit for awhile. I've noticed recently that when this happens it also smells like it is flooded and when starting it I have to floor the accelerator.
A long time ago I had a similar problem with my son's 1970 that ultimately was resolved by replacing the ECU. Hence the following question: I have available a working 1974 ECU. I'm wondering if I can swap ECUs with no other modifications to see if the problem goes away and stays away. Brad Anders' FI page states that the 1973 should use only a particular ECU, but in his chart of the preferred setup he states to use the 1974 ECU. Would it be harmful to any component to swap the ECUs and test my theory? This problem came up just before leaving for a summer road trip and I won't be able to work on it until just before Labor Day, but I'm hoping to figure out a direction now so that I can jump on it when I get back home and get the car ready for the RRC. |
ThinAir |
Jul 19 2020, 11:36 PM
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#2
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Best friends Group: Members Posts: 2,543 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region |
Thanks for the help guys. I was aware that Brad Anders' recommended setup with the 74 ECU also included other parts that were different from 1973. Your experience helps me avoid doing something dumb (other than asking the question!). You've given me some good directions to explore when I get back home. Thank you very much for your advice.
In the meantime I've got exploring to do in Wyoming, Montana, Idaho and I'm not sure where else. |
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