Question about Troy Bilt 5.5hp Self Propelled Mower
Could just need carby clean out check clean air filter check governor spring replace plug clean out fuel tank
Posted on Jun 12, 2013
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Posted on Jan 02, 2017
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The ECM detects that the engine has started, but did not received a CMP sensor pulse during the first engine revolution.
The ECM detects that the engine is running, but does not receive a CMP sensor pulse for 800 of 1,000 engine cycles.
The 4X camshaft position (CMP) sensor circuits consist of an engine control module (ECM) supplied 5-volt reference circuit, low reference circuit, and an output signal circuit. The CMP sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 4-tooth reluctor wheel attached to the camshaft. As each reluctor wheel tooth rotates past the CMP sensor, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The sensor returns a digital ON/OFF DC voltage pulse of varying frequency, with 4 varying width output pulses per camshaft revolution that represent an image of the camshaft reluctor wheel. The frequency of the CMP sensor output depends on the velocity of the camshaft. The ECM decodes the narrow and wide tooth pattern to identify camshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses CMP sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and for limp-home operation.
You need a cam sensor or have wiring problem !
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