Question about 1976 Cadillac Eldorado

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I can not find an ECU for my 76 Eldorado with Fuel Injection.

Any Help????

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  • jp4fl May 08, 2009

    The problemis that the car runs but you have to keep pumping the throttle..... Then it will accelerate and bugs down by pumping the accelerator I can verally keep the engine running..... I have changed the plugs fuel filters fuel pump some fuel injectors... set the timing etc... the only thing left is to rebuild the fuel injector pump (servo) any additional help would be greatly appreciated...

    Thanks

  • jp4fl May 17, 2009

    Hey guys thanks for all the information..... I am dealing with the problem asI write........ I tried to send answers to the comments but was not able...... I am new to the Web site and haven't figured it out yet..... No I don't have a picture of the car yet... I will soon...

    I am trying all the steps and suggestions.... I have also found a rebuild ECU.... Hope that i will help... I am sure I'll havemore questions in the future.... However, just in case if you can think of any other sugestions for the fuel problem I'll appreciate it...

    Thanks a million,

    Julian Perez

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  • Master
  • 585 Answers

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

  • 1 more comment 
  • Bruce Volkers
    Bruce Volkers May 08, 2009

    I've had this before, the fuel filter was clogged. Other possibilities would be the fuel pump, or a leak in the tank, like the rubber line connecting the pump to the tank steel line. The rubber caln look fine but have a small rupture spraying the pressure (fuel) into the tank interior.

  • Bruce Volkers
    Bruce Volkers May 15, 2009

    Were you able to get the fuel starvation issue resolved? If not, have you performed a check of the fuel pressure? Should be around 40-50 psi. If fuel pressure is in range, it could be an oxygen sensor causing a problem. Another clue for you: all EFI systems will go into a "limp mode" forcing the system to make the engine run decent, just not optimally. This mode can be induced by disconnecting one of the sensors in the system. My favorite is the intake air sensor, second is the idle air control servo. You know the system is out of loop and"limping" when the "check engine" light appears. If it runs better with the CE light on than off it's getting bad feedback from a sensor, such as an oxygen sensor.

  • Bruce Volkers
    Bruce Volkers May 16, 2009

    I may be off base, afterall this is very early. Maybe I can find some more info. I'll be back........

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Look at this picture:

http://www.therodshop.com/images/cadillaceldorado/eldoenginenofenders.jpg

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<p><b><u><span>Excessive fuel consumption and 'lumpy' idling engine</span></u></b><br /> <p><b><span>Possible faults:-</span></b><br /> <p><b><u><br /></u></b><br /> <p><b><u><span>Coolant sensor </span></u></b><span><span> </span>- engine is signaled as being 'cold' all the time, not just at start up, causing ECU to set longer injection cycle </span><br /> <p><span><span>&oslash;<span> </span></span></span><span>Low coolant level can prevent sensor being able to detect coolant temperature</span><br /> <p><span><span>&oslash;<span> </span></span></span><span>Faulty 'open' thermostat allows coolant to circulate without regulation and perhaps prevents the engine from achieving normal running temperatures.</span><br /> <p><span> </span><br /> <p><b><u><span>FPR</span></u></b><span> - 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.</span><br /> <p><span> </span><br /> <p><b><u><span>Vacuum leak </span></u></b><span>- 'high oxygen' signal from O2 sensor causes ECU to set longer injection cycle.</span><br /> <p><span> </span><br /> <p><b><u><span>O2 sensor</span></u></b><span> - 'high oxygen' sensor error causes ECU to set longer fuel injection cycle</span><br /> <p><span> </span><br /> <p><b><u><span>MAF</span></u></b><span> - 'over reads' in error the amount of air entering causing ECU to set longer fuel injection cycle </span><br /> <p><span> </span><br /> <p><b><u><span>IAT</span></u></b><span> - 'under reads' in error the temperature of incoming air causing ECU to set longer fuel injection cycle</span><br /> <p><span> </span><br />

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first thing to do is check the fuel flow - clean the in-line as you did and change the canister filter. Also check for any blockages / kinks in the fuel line etc. Vent opened on tank if applicable

Would the engine rev up when out of gear ?

Also check your ignition switch,check spark, fuel pump, voltage regulator,pick up coil in dist,

Let me know for further clarification.


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1 Answer

Does ignition module control fuel


there is no such model on this car.
this car has EFI, in 1992 , the 8 valve has TBI injection and the 16valve G16B had MPI (4 injectors)
both engines the ECU, creates spark at all times.
the input to the ECU is CMP /CKL cam and crank sensors
then the ECU computes ADVANCE and then drives the ignitor
next to the Ign coil. the coil charges and the ECU release this
charge and BAM , mr. Tesla inductive spark. hits the DIZZY.
that is how spark works.

the ECU controls fuel not spark , or better the ECU controls
spark INDEPENDENTLY from fuel;. (with exceptions)
exceptions:
or are you asking about the fuel safety feature built in to all EFI
cars 1988 too now? that is the ECU does monitor Spark
and CMP and CKP and does in fact cut fuel, when the ECU
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as does , wide open throttle cranking cuts fuel. (injection)
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see block diagram here.
http://www.fixkick.com/ECU/EFI.html

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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 temperature

? 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


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