I acquired a 1987 C-22 "Vanette" in good condition, except that it is not getting enough fuel.
Was wondering if anyone knows of something Nissan modified during the many recalls to disable the fuel injection system under some conditions? I have the rather vague factory shop manual and have tested every parameter of the injection system I can think of, or find in the manual.
It all seems to be working, but just not delivering enough fuel. I get a code 44 from the ECU and the manual says 44 means No Problems. No error codes at all from the ECU. Both injectors are clean and apparently working. I pulled them out and they open at about 4 volts and 200 ma.
The fuel pressure stays right on 38 psi, as specified.
Looked at the signal to the injectors with a logic probe and an O-scope and they are both getting a pulse, though I couldn't determine that the pulse width was varying as it should with engine speed.
All sensors and throttle switches seem OK except the throttle position sensor works backwards to what the manual says. I assume that is a typo in the manual since jumpering the wiring to the position switch so it works as the manual says made no difference in how the engine runs.
Tested the ignition system extensively and the 1 degree and 180 degree signals are both there. All ignition connectors clean and have continuity.
It won't idle unless I add fuel via the intake duct. When I do this, it idles smoothly. Seems like something is limiting the ECU from delivering the proper amount of fuel.
I can also make it run by momentarily triggering an injector with a jumper wire to ground. The manual warns not to do this, but I wanted to verify that the injectors were capable of flowing enough fuel.
Any suggestions gratefully accepted.
Bill F