An electrical fault would cause you to lose spark or fuel or both ?? CKP & CMP are both related to fuel and spark ...even if they were causing spark or fuel at the wrong time you would be getting a misfire/backfire etc. not a non start issue when you are getting both ?? if the PCM was totally shot you would lose one or both of them .. you are getting over 100 psi compression (100 being the lowest recomended) and spark and fuel .. this vehicle should be firing up .. even with the PCM as a emmissions controller ... an engine is an engine, if it has fuel and fire and compression it should run .. it may run rough because of faults on the CMP/CKP .. but it should be running .. I agree with you regarding the cat ... it shouldn't be bad yet ... but what else is there .. ??
Camshaft Position (CMP) Sensor
The CMP sensor is located in the distributor and detects cylinder No. 1 signal to be sent to PCM. CMP sensor is serviced by replacing distributor.
Crankshaft Position (CKP) Sensor
The PCM uses CKP input to determine injector and spark timing. CKP sensor also used for misfire monitoring. The CKP sensor is mounted on front of engine and detects movement of crankshaft pulley.
Free Auto Repair Advice by Certified ASE Technicians.
Troubleshooting / Car Engine Cranks but Will Not Start
For an engine to run, you need three things to happen inside the engine, compression, fuel and ignition, without any one of these components the engine will not run. Follow the repair guide below:
Engine Configuration with Camshaft Operation
Compression - Engine compression caused by crankshaft rotation and a piston moving up and down inside the engine block. If the timing belt or timing chain fails it will cause the camshaft to become out of correlation with the crankshaft or allow the camshaft to stop rotating. Either of these conditions will cause the engine to lose compression and sometimes cause internal engine damage.
Fuel Delivery System - The fuel system includes: fuel pump, fuel injectors, pressure regulator, fuel filter and pressure lines. This system is used to supply fuel under pressure to the fuel injection system, the lack of fuel pressure or volume will cause the fuel delivery system to fail and the engine to stall or not start.
Ignition Spark Delivery System - The ignition system components include: spark plugs, spark plug wires, crankshaft angle sensor, camshaft angle sensor, ignition coil, ignition module, knock sensor and ECM (engine control module). The engine relies on the ignition spark to be delivered to the combustion chamber at the correct time. If the ignition spark stops or is delivered at the wrong time the engine will not run or run poorly
Friday, January 16th, 2009 AT 8:15 PM