Bad fuel shut-off solenoid. I FOUND ON MY CHEVY S-10 THAT THE OIL PRESSURE SWITCH WILL FEED THE FUEL PUMP EVEN WITH THE KEY OFF
most electrical fuel pumps work that way. it prevents the engine from flooding. also when you run out of gas, you no longer have to crank the engine to get it started again. all you do is turn the ignition to the on and off position 5 or 6 times and the gas reaches the intake. once the engine is running, the fuel pump continues to run and feed fuel to the engine to keep it running. frank t ( a car nut )
When any car idles, it lowers the ignition energy (but not completely) to keep the car running. When it is cold outside, your Subaru's ignition energy is lost through heat because electricity also is measured through heat. When there is less ignition energy when it is already running on a lower ignition level, the car (your Subaru) is not likely to idle.
A spark ignition engine is a gasoline engine. A compression ignition is a diesel engine.basic difference between compression and spark ignition engine is ,compression ignition is a diesel engine. spark ignition is a gasoline engine.diesel engines compress the fuel to a point where the fuel explodes, thus giving ignitiongasoline does not compress to explosion, therefore it needs need a spark to ignite the fuelspark ign. is gasoline. comp. ign. is diesel.A compression ignition engine is typically a diesel. It compresses air so much that the heat from the compression is enough to cause the fuel to ignited once injected. A spark ignition engine is your average gasoline-burning car engine. It uses a spark plug to ignite the air/fuel mixture instead of relying on compretssion ignition.A compression ignition engine uses very high compression of the air to heat it self up and the fuel is injected into the cylinder which self ignites (a diesel engine is a compression ignition engine).A spark ignition engine uses a lower compression ratio and requires the use of a spark to ignite the fuel (a petrol engine is a spark ignition engine).Because the oils used for a diesel have a higher calorific value, they have a better fuel economy, They also do not need extra energy usage to keep the engine running, unlike the energy that is lost to power the spark plugs from the generator/alternator which is taken from the useful energy produced by the engine.
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