(Another) Thirsty EA (CPI)
I have begun an epic journey of trouble-shooting an EA I just purchased.
The problem is it's using about 20-25 litres of fuel per 100km in city driving, where it SHOULD use about 14-15 max and 10L/100k on the highway.
I have replaced any leaking vacuum tubes, plugs look good, injectors have been flushed, it appears to have a brand new O2 sensor. It has weird high idle happenings even at operating temperature, although I've read the CPI EAs will do 61km/h at idle.
A mechanic ran the onboard diagnostics and it came up with a faulty MAP sensor. He ran it a second time and it came up good. A new one was installed it worked for a while (a few seconds) then went back to running too rich.
The manifold pressure was tested ok, so no leaks supposedly. However the fuel pressure was way too low indicating a blocked filter or a dead pump.
Looking into the throat of the intake manifold, is the fuel meant to splurt lazily out of the injectors in large droplets and splash onto the throttle butterflies and pool around for a while then finally over the edges into the manifold? Or is it meant to spray out of the injectors in a fine mist?
One theory I have come up with is that with the low fuel pressure, the fuel isnt atomising properly and the ECU is compensating by pulsing the injectors more.
I'm also suspecting an O2 sensor fault, or perhaps the wiring is causing a wrong reading due to faulty wiring. I'm not suspecting thermostat or temperature sensor faults at this stage as the temperature gauge reads normal operating temp and the engine fan kicks in, although there is the weird high idle problem that occurs at times.