Question about 1976 Cadillac Eldorado
Wow, if my guess is right, that probably has one of the last of the 500 inch engines. I expect it's the same ECU as the Corvettes had, just has a different response curve using a different EPROM. The EPROM usually doesn't go bad and can therefore be transferred into another ECU. If you can find a Corvette ECU that's a physical match, you should be able to plug in your EPROM and be good to go. The junkyards may have books to tell what will actually cross, if they have any to go back that far. But are you sure the ECU is at fault? What indications do you have?
Posted on May 08, 2009
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Posted on Jan 02, 2017
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Following list of possible faults should help:-
Coolant sensor - engine is signaled as being 'cold' all the
time, not just at start up, causing ECU to set longer injection cycle
? Low coolant level can prevent sensor being able to detect coolant
? Faulty 'open' thermostat allows coolant to circulate without regulation
and perhaps prevents the engine from achieving normal running temperatures.
FPR - broken diaphragm allows fuel to enter
the vacuum line and then into the inlet manifold. Additional source of fuel
makes the fuel air mix richer causing a faster and lumpy idle.
Vacuum leak - 'high oxygen' signal
from O2 sensor causes ECU to set longer injection cycle.
O2 sensor - 'high oxygen' sensor error
causes ECU to set longer fuel injection cycle
MAF - 'over reads' in error the amount of air
entering causing ECU to set longer fuel injection cycle
IAT - 'under reads' in error the temperature of incoming air causing ECU to set longer fuel injection cycle
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