I have a Renault 5 1.4 Campus, single point injection/cat.
Every now and again it goes mad and over-fuels to the point that it stops running, last time it did this was after some unconnected mechanical work (gearbox) and it wouldn't start without a tow, I worked out that by disconnecting a sensor in the inlet manifold (fuel or inlet charge temperature I believe) it cured the symptoms, just meant having to hold the engine at a fast idle for the first 30 seconds after a cold start until it warmed up. I could actually see the amount of fuel being injected change when I unplugged it as the injector sits right on top of the inlet/butterfly.
I've been driving it without the sensor connected for a week or two with no problems other than an occasional hesitation, this afternoon it suddenly did it again, chucking loads of fuel in so the only way to start it was to disconnect the injector as there was plenty of fuel sitting in the inlet. Obviously it'll only run for a few seconds like this.
So, does anyone know how single point injection works? It has no air mass sensor and only the inlet temp sensor and a coolant temp sensor plus a single-wire lambda to work with, how does it know how much fuel is required? Does it increase the number of injector pulses or open the injector for longer?
I have changed every sensor except the lambda, disconnecting it and/or earthing the lead to it makes no difference.
At a loss now, starting to make my brain hurt
Help!!
Every now and again it goes mad and over-fuels to the point that it stops running, last time it did this was after some unconnected mechanical work (gearbox) and it wouldn't start without a tow, I worked out that by disconnecting a sensor in the inlet manifold (fuel or inlet charge temperature I believe) it cured the symptoms, just meant having to hold the engine at a fast idle for the first 30 seconds after a cold start until it warmed up. I could actually see the amount of fuel being injected change when I unplugged it as the injector sits right on top of the inlet/butterfly.
I've been driving it without the sensor connected for a week or two with no problems other than an occasional hesitation, this afternoon it suddenly did it again, chucking loads of fuel in so the only way to start it was to disconnect the injector as there was plenty of fuel sitting in the inlet. Obviously it'll only run for a few seconds like this.
So, does anyone know how single point injection works? It has no air mass sensor and only the inlet temp sensor and a coolant temp sensor plus a single-wire lambda to work with, how does it know how much fuel is required? Does it increase the number of injector pulses or open the injector for longer?
I have changed every sensor except the lambda, disconnecting it and/or earthing the lead to it makes no difference.
At a loss now, starting to make my brain hurt
Help!!
