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: 2,553 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. |
JamesM |
Jul 17 2020, 08:23 AM
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#2
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Senior Member Group: Members Posts: 1,963 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
No wont work (well, it will run but it will be REALLY rich), the 73 system is sort of an oddball and very specific about what parts you use. If you want to use the 74 ECU you need to swap out the 73 specific Head temp sensor and MPS along with it.
Verify which setup you have though as the later 73 cars use the 74 setup. Honestly its probably not your ECU though as that is the component least likely to go bad. Relay boards and wiring harnesses on the other hand tend to be weak spots. |
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