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I meant the fuel pressure in the fuel rail using the Schrader valve on the fuel rail.
You can vary fuel rail pressure by using a vacuum pump with gauge.
If you have no fault codes ... such imbalance, lean or rich, could set an OBD fault code in socket 2 (fuel injection) and socket 6 (ignition).
There exist ways to replace the engine coolant senor engine control uses without having to remove the air intake manifold port. (Unless the gasket is original as the air intake port gasket tends to embrittle and shrink, causing air intake vacuum leaks.
Any exhaust leaks? Engine cold, some dish detergent in a spray bottle, and spray cold exhaust unions from the exhaust manifold gasket to the header pipe out to the catalytic converter input?
The header pipe out to the catalytic converter in union is closest to the header pipe support bracket that hangs off to bell housing bolts. If the header pipe out to the catalytic converter in union leaks exhaust, ambient outdoor air can be sucked in. A working oxygen sensor encounters the air, and engine coltr sets a fault code and enriches the fuel to air ratio.
Yet you have no fault codes.
Is the catalytic converter original? If your 1992 940 has been running in a lean or rich fuel to air ratio, the catalytic converter can fail and become clogged. A clogged catalytic converter may not set fault codes immediately, yet will make running the engine and driving it, as the exhaust is partially or worse clogged, so accelerating, or trying to, may cause the engine to 'bog'.
A throttle position switch (TPS) can begin to fail yet engine control is forgiving and not set a fault code. The TPS can fail a few ways. The way TPS to fail is engine idle control remains on interferes with pressing the gas pedal, so the engine stumbles or bogs.
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Beh.
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