Nissan Sentra94.Engine dies.But when I disconnect a small connector that is next

kkk

kkk

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to 1 of the injectors the eng? ine works well but the light CHECK goes on. What is wrong with the engine? There are also three other connectors in the same area. When I disconnect them nothing happens. What are these connectors for? Thanks
The connector is electrical with two contacts.
All of the connectors I have mentioned are electrical. As for the engine I don't know what type of engine is this. 4 cilinders. I don't know how many valves it has. I think it has 8 valves.
I think this electrical connector controls the fuel flow to the engine. Te be more correct the computer controls the fuel flow through this connector. The other 3 connectors I think must be connected to some sort of sensors that is why when I diconnect them nothing happenes.
 
Need more details: Connector - Electrical ?? Fuel line ? Vacuum line ?? What engine do you have - the I4 or the V-6... Are you unhooking the vacuum to the fuel pressure regulator ??
 
my nissan 200o sentra does this on me sometimes. shake those wires near the injectors or check wires for loose contact, remove plug and clean connections, ask electrician to rewire this wires
 
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