Diagnosing A P0301 Misfire Code On A 2001 Mercedes-Benz E320 Sedan
Since the advent of OBD II, every vehicle is equipped with a sophisticated system that measures each cylinder’s contribution to engine power, becoming one of the most difficult challenges we face. Each time a cylinder fires, the misfire monitor uses a highly accurate crankshaft angle measurement to measure the crankshaft position. This system needs to have an accurate crankshaft position sensor that is able to read the crankshaft position, even at high RPM, sending a clear signal to the PCM. Then the PCM monitors the crankshaft acceleration time for each cylinder at the firing time.
Scan Tool Diagnostics And Your Shop’s Needs
A scan tool is absolutely essential for diagnostics on today’s vehicles. You need a scan tool not only for diagnosing engine, emissions and transmission problems, but also for troubleshooting virtually any system that has electronic controls. You might acquire one or two factory scan tools for the makes you service most often, but you’ll also need some type of general-purpose aftermarket scan tool that can handle a broad range of vehicle makes.
Mercedes: Diagnosing a P0301 Misfire Code Harnessing the Benefits of an Amp Probe
Electronics Diagnostic Specialist Sergio
Diagnostic Solutions: No-Code Sensor Failures
Import Specialist Contributor Gary Goms takes a look at how to utilize one or more scan tool features to detect an intermittent, no-code sensor failure.
Misfire Testing with a Scan Tool Tip Clip
In this tip clip, instructor Jim Wilson talks about P0300 codes and misfire testing using your scan tool. He talks about how you would look at certain things such as RPM, MAP, changes in load, and long term fuel trims. He goes on to mention some things technicians should be aware of on Ford and Chrysler vehicles.
This clip is an excerpt from the 90 minute comprehensive “Functional Scanner Testing” with Jim Wilson, available from Automotive Video.
Tech Tip: Kia Constant Variable Valve Timing (CVVT) Oil Control Valve Inspection
This bulletin provides information related to the Oil Control Valve (OCV) used in Constant Variable Valve Timing (CVVT) systems. If, at any time, the OCV is suspected as a cause of rough idling, poor acceleration, camshaft timing misalignment-related trouble codes, misfire-related trouble codes, etc., on a Kia vehicle equipped with a CVVT system, be sure to perform the OCV inspection procedure below before replacement.
Pulling Codes: Rough Road Data Not Available?
A 1998 Chevrolet Blazer is looked at by the state to determine if the cost to repair this vehicle may exceed what many may deem reasonable. The owner of the vehicle has suffered some financial hardships and we have been asked to take a look at the vehicle.
Pulling Codes: Mean and Lean with Shades of Gray
This article will document the infamous P0171 code – Lean Condition. A fuel system lean condition can be broken down into three subsections, namely, fuel pump performance, fuel quality and injectors. Keep in mind this is only a starting point, but it is a good place to start.
Misfire Testing with a Scan Tool
In this tip clip, instructor Jim Wilson talks about P0300 codes and misfire testing using your scan tool. He talks about how you would look at certain things such as RPM, MAP, changes in load, and long term fuel trims. He goes on to mention some things technicians should be aware of on Ford and Chrysler vehicles.
This clip is an excerpt from the 90 minute comprehensive “Functional Scanner Testing” training program with Jim Wilson, available from Automotive Video.
AVI Offers Base Engine Analysis Class
Some of the most difficult problems to diagnose are engine problems, but with Automotive Video’s newly released “Base Engine Analysis” class with Dave Scaler, you can perform misfire diagnostics faster, more efficiently and without engine disassembly.