Concord Auto Repair

How a Relative Compression Test Helps Diagnose Engine Problems At Accomplished Auto, we use a test called a relative compression test to help figure out what’s going on when your engine has a misfire or runs rough. This test is fast, safe, and doesn’t require taking anything apart. We hook up a special tool called a lab scope and crank your engine. The tool shows a graph with lines representing each cylinder’s compression (pressure). If one line is lower than the others, that tells us one cylinder might have a problem. We also have other tools for this test as well as some vehicles. Ford for example have tools for this test in OEM capable scan tools as well. This test doesn’t tell us exactly what’s wrong, but it gives us a strong clue. For example, if all cylinders look good, we know the problem isn’t likely caused by low compression. That means we can focus on other possible issues like spark or fuel. But if one cylinder is low, we know to check ... read more

Fuel Pump Diagnostics, Testing & Replacement in Concord, NH Fuel pumps are the unsung heroes of your car’s engine. They quietly send fuel from the tank to keep your vehicle running. When they start to fail, it can leave you stranded or struggling to accelerate. Here we will talk about some of the signs of a weak or failing pump as well as the complexities of today’s modern fuel systems. As well as why proper testing and diagnostics are critical to repairing these systems. Including systems with more than one pump with sophisticated speed and volume control modules. Also, how Accomplished Auto in Concord, NH can help with professional fuel pump testing and high-quality replacement. Finally, we’ll share some tips to extend your fuel pump’s life. Let’s dive in! Signs of a Failing Fuel Pump How do you know if your fuel pump is on its way out? Watch for these warning signs: Difficult Starts: The engine cranks longer than usual or requires multiple attem ... read more