If a car turns over but does not start, it has a problem with compression, ignition or the fuel to air ratio. Determining which of these three areas is responsible for the problem is the first step in troubleshooting, according to the Linn-Benton Community College.Know More
An engine experiencing low compression does not increase the temperature of the air and fuel mixture enough that it burns. There are several reasons cars experience low cranking compression, such as a slow turning starter motor, improper sealing of the cylinders or a broken timing belt or chain. An experienced mechanic is often able to determine the problem by listening to the engine as it attempts to crank.
In order to operate correctly, the ignition system provides a spark to ignite the compressed fuel and air mix. A spark tester helps to determine if the ignition is providing sufficient spark to start the engine. If the engine produces spark but does not start, the problem is often improperly installed plug wires. Following the manufacturer's firing order helps to resolve the problem.
An improper fuel to air mix prevents engines from starting. A bad fuel pump or filter limits the amount of fuel entering the cylinders. A plugged air filter makes the mix too rich for the car to start.Learn more about Car Parts & Maintenance
A car can hesitate or stall while going uphill for a number of reasons, but typically the problem occurs when the engine's valves and rings are worn. Because driving uphill puts the engine under additional stress, less compression is dispensed, which weakens the engine over time. Stalling can also occur when the engine's sensor no longer works.Full Answer >
When the explosive noise of a car backfire occurs, it usually indicates that the air-to-fuel mixture is unbalanced or that a problem exists with the vehicle's timing. A backfire is the result of fuel burning outside to the engine's combustion chamber. Backfires can occur in either the intake system or the exhaust system, depending on the cause.Full Answer >
When the Safety Restraint System light stays on, this means there is a problem with the airbag system. If the SRS light only blinks when the car is first turned on, this is completely normal. The SRS light blinks upon starting to indicate that the system is checking for malfunctions in the supplemental restraint system.Full Answer >
Depending on whether the engine is hot or cold, there are a couple different reasons why a car might start with no problem but stall shortly afterwards. If the problem only happens when the engine is cold, a bad electric sensor is likely to blame. If the car stalls even when the engine is warm, the cause is likely a faulty electric fuel pump.Full Answer >