Some customers may complain about a clunk coming from under the hood when they are not moving or at low speeds. The noise is related to the A/C compressor engaging the clutch so the refrigerant can be moved around the system. Some noise is normal. But, if the drive belt or tensioner are worn it can make the noise louder. Andrew Markel covers how to diagnose the drive belt system and compressor. Sponsored by INA, a Schaeffler brand.
Video courtesy ImportCar.
What if there are no codes and a misfire is intermittent? This is where it gets complicated.
What is a misfire? Is a misfire when the cylinder does not fire? Is it when the cylinder fires too soon or too late? The answer is “yes” to both questions. Some misfire complaints are a flashing check engine light, and a P0300 to P0312 diagnostic trouble code (DTC) indicates that one or more cylinders are misfiring. This is the easiest misfire to diagnose. But, what if there are no codes and a misfire is intermittent? This is where it gets complicated.
Following best practices and using appropriate equipment ensure customer satisfaction and safety.
Use a scan tool that can look at special direct fuel injection parameters and perform bidirectional tests.
If camber, caster or toe are out of specifications, there is usually a reason why.
Here are six tips to use when diagnosing a vehicle with a dead battery.
This function of the power management system uses several modules to decide when the engine needs to stop and start.
Like any automatic transmission, the condition and level of fluid in a CVT unit will determine the performance.
Over time, the oil filter can collect enough contaminants to become restricted.
The key to servicing these systems is proper information and understanding precisely how these systems operate.
