Your Marmon Raceabout engine control system detects a problem, the computer stores the diagnostic trouble
code P0490 in its memory.
To figure out what is wrong with your vehicle you must first extract the P0490 DTC For Marmon Raceabout.
A good ground connection is also extremely important. P0490 Marmon Raceabout engine problem because the presence of voltage at the panel harness won't make the panel work if there is a bad ground connection. Since the instrument cluster is mounted in a plastic dash, a separate ground wire or ground circuit through the wiring harness is usually needed to complete the power circuit. Refer again to the wiring diagram to find the ground path, and then check it with your ohmmeter. Do not use a self-powered test light because it cannot measure resistance (any resistance will lower circuit voltage).
P0490 Marmon Raceabout DTC Meaning
Powertrain Code - Problem is related engine, transmission and emissions systems.
SAE - Generic
Fuel And Air Metering (Injector Circuit Malfunctions Only)
TP Sensor Learn Not Complete
Transmission Engaged At High Throttle Angle
While fuel economy was increased, acceleration was seriously compromised, and the loss of engine vacuum led to a dangerous loss of braking assist when the P0490 Marmon Raceabout code system was in four-cylinder mode. In addition to these issues, while the company proposed a hydraulically controlled system that could be switched from within the car, the version they implemented had to be manually changed in the engine compartment using hand tools.