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Posted on Jan 02, 2017
SOURCE: 1989 jaguar xjs v12 fuel mixture
Chances are the coolant temperature sensor or its wiring have failed, or the vacuum line to the MAP sensor is leaky or broken (I believe the V12 in '89 guise uses MAP sensors). The MAP sensor measures Manifold Absolute Pressure. Along with this pressure the ECU looks at engine RPM. It also measures air temperature. Knowing pressure and temperature we know density, and knowing engine speed tells us how much volume of air is going through the engine. All of this together is computed into air mass and is used to calculate how much fuel mass should be admitted. If the vacuum line is broken, the ECU reads less vacuum and produces rich mixture thinking that the engine is under high load.
Posted on Dec 27, 2008
check the pwer switch. if you don't detect any sign of live. then you have to open the door panel to check the motor. most likely the motor or the "T" rail cable is broken.
Posted on Apr 02, 2009
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