Too rich fuel from fuel injectors

Hi,

sorry to jump in now as I was on vacation

It is correct that each trigger contact opens only once per ignition distributor rotation or every 2nd engine rotation. So you should check that each trigger contact is correctly seen by the ECU. Either via oscilloscope or via multimeter measuring average voltage in operaton.

If that works well, check contact 3,4,5,6 output to injectors. If all show the same average voltage, then it is the ECU.

dnadanny1 wrote: Thanks for your comment.
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Also, I noticed that the adapter of coolant temperature sensor is broken, and there is one brown wire and one white-blue wire out of it. Are they interchangeable?

For my curiosity,if the trigger points open only once for all 4 contact points, there should be only 4 signal sending to the ECU. How is the 4 signals going to give 8 fuel injection for 8 cylinders in a correct time intervals? It does not seems matched.
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Hi,
the wires of the temperature sensors are interchangeable.

It is correct you have only 4 injection signals. The injectors are paired - two 'fire' at the same time. At Jaguar V12 even 6(!) injectors fire at the same time.

Regards
Norbert

Thank you for your information.
BTW, the wires in the injectors can also be interchangeable?

Yes the injector cables can be changed, no problem.

Thank you for your help.
I had checked ECU and electronic injector plugs as you suggested. The result is that:
1) 24 pin and 16 pin in the ECU have above 11.5 volt which is normal.
2) I had checked all 23 pins adapter wires in ECU (2, 25 are empty). And there is no break and no ground.
3) I had unplug all electronic injectors plugs from injectors, and tested its voltage. When I cranked the engine,
1 cylinder (4 volt)
2 cylinder (9 volt)
3 cylinder (4 volt)
4 cylinder (9 volt)
5 cylinder (4 volt)
6 cylinder (4 volt)
7 cylinder (9 volt)
8 cylinder (9 volt)
it is weird that as far as I know, the voltage to injectors should be under 3 volt. I have no idea why this happened.
Thank you again.

Hi Danny,

dont worry, what you measure is haevily dependent on your measuring equipments integration function. An oscillosope would show better results.

So I understand you measure on the connectors of injectors. Can you also please measure pins 21, 22, 13 and 14 for the incoming signals from trigger contacts. With ECU connected and while cranking. Afterwards we should know whether the fault is on T.C. or on ECU.