I have a 1973 Lotus Europa project car with a 1998 Acura Integra motor. Problem is the noid light is flashing that the ECU is sending a signal but the injectors are not spraying. They have adequate volts and the injectors have been tested and are getting fuel. Really could use some help. I can not figure out what's going on here. Thanks!
I cannot help with this issue but would love to see pics of your Europa as TCST is also a '73 ...
Do you have them grounded properly? How do you know they aren't firing?
I might be wrong about this, but I believe the noid lights are basically just an LED with a series resistor to limit current to prevent cooking the LED . If that's so, they don't present any sort of real load to the ECU. (So if the ECU is providing voltage and can supply a mere 15 milliamps (.015 Amps) or whatever nominal amount of current needed to light an LED, it will seem like the ECU is working OK.) An actual injector will be somewhere between 2.5- 12 ohms depending on what type they are. If we take the highest resistance injector (12 ohms) in a 12V system, the ECU would need to be able to supply about 1 amp to fire it. For the lower resistance injectors, the ECU has to supply even more current.
Make sure there are no high resistance connections causing voltage drops in the power supply to the ECU, make sure that the grounds don't have voltage drops. IIRC Some Honda products also have a resistor pack that's in series with the injectors. If you have that type of system, is it present and correct?
Just some top of my head ideas, there are others here who are much more expert than I am.
In reply to wvum. They are grounded to the ECU and I know they arn't firing because I removed them with the fuel rail attached, wired the fuel pump to the battery and attached a 9 volt battery to the injector and it fires.
Just don't understand how the noid light connected to the harness could show a pulse from the ECU but the signal is somehow not reachinf the injector.
I thought I explained it pretty clearly but let's try again. The noid light does not draw as much current as a real injector. Therefore, it's not really a fully valid test of the ECU's output. "Can output enough voltage/current to blink an LED" is not equal to "can provide enough current to fire an injector."
BillsVTEC said:In reply to wvum. They are grounded to the ECU and I know they arn't firing because I removed them with the fuel rail attached, wired the fuel pump to the battery and attached a 9 volt battery to the injector and it fires.
Just don't understand how the noid light connected to the harness could show a pulse from the ECU but the signal is somehow not reachinf the injector.
Grounded to the ecu, yes. What does the other end attach to? Do both injector wires go to the ecu?
In other words, are both "sides" of the injector circuit good and clean and connected properly?
So, with the 9v trick, you proved the injectors DO fire with a 9v. How do you know they are NOT firing when attached to the ecu?
In reply to wvumtnbkr
The other end attaches to the battery thu a fuse it shows 12.4 volts with the key turned and 9.4 when cranked. I really appreciate your help. Is it possible the ground signal from the ECU is to weak? Any other ideas.
In reply to wvumtnbkr :
I removed the injectors with the fuel rail attached, connected the fuel pump to the battery and they fire with the 9 volt
How much of the original honda wiring is being used? Did you do the swap yourself? Have you verfied that its not simply a timing issue and they are firing out of order?
I didn't do the swap. The engine wiring is all Acura. I don't think it's timing. I have plenty of spark and I think the fore order is correct. Thanks for all the help. I just don't get what's going on here. We have the ECU which is showing a pulse. The live injector wire has volts from the battery. The fuel pump is working, has pressure to the injectors and they fire with the nine volt battery.
What am I missing. Thanks for the help. Any other ideas would be appresiated.
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