I have a l.6 sohc engine in my 98 civic. It appears to be getting too much fuel in the cylinders to fire. This car has always started as soon as the key was turned. This is a very smooth running engine with gas mileage around 37 mpg. No black smoke or anything from the exhaust. This started all at once. I thought it might be electrical, I have replaced the ignition coil, dist. cap, rotor, wires and the plugs 3 times. Please help
car will not start on 1998 Honda Civic
by golfman in Burlington, NC on February 02, 2009
ANSWER by patrick mannion , February 02, 2009
Does this happen every vehicle start, or only on an engine start from cold? Are you sure that it appears to be getting too much fuel and not in fact not getting fuel at all. To prove or disprove this, crank over the engine when it is being stubborn to start. After a period of cranking remove the spark plugs and see if they are fuel fouled, if they are your assumption is correct. Excess fuel to an engine can be caused by a faulty coolant temperature switch or an air filter housing that is restricting air (I have seen mice build a nest in the air filter housing). These two cases are rare and would effect the car's performance once the vehicle has started, the engine would emit black smoke from the exhaust pipe if the engine is receiving excess fuel. A faulty main relay is more likely a cause of a no start condition (it operates the fuel pump once it receives a signal from the distributor that the engine is being cranked over.