Why does my Komp engine keep misfireing?
When you switch off & on again the engine will run ok again until the ECU detects the misfire going over the threshold once more. So is a compression problem is start starting to cause a misfire then it will often run ok for a while & then the ECU will detect it & shut the cylinder off & the misfire becomes even more apparent!
What does it mean when a cylinder is misfired?
If your scan tool’s misfire history indicates multiple cylinder misfires, focus on the cylinder with the most misfire counts. The misfire counts on adjacent cylinders are often “sympathetic” misfires that will often disappear when the primary misfire is repaired.
What causes an intermittent misfire on a V-type engine?
In either case, the misfire might occur only under specific operating conditions. Engines equipped with variable valve timing (VVT) generally cause misfires on a single cylinder bank of a V-type engine if a cam phaser or solenoid intermittently sticks in position.
What is the PID for a Mercedes Benz misfire?
A customer brings his car into the shop with a “strange vibration.” After we scanned the vehicle, we found the following DTCs: P0305, misfire on cylinder #5; and P0301, misfire on cylinder #1. The freeze-frame data in Generic OBD II gave us the following PID values: PRM = 800, ECT = 190, Eng. Load = 20%, VSS = 0 mph.
When you switch off & on again the engine will run ok again until the ECU detects the misfire going over the threshold once more. So is a compression problem is start starting to cause a misfire then it will often run ok for a while & then the ECU will detect it & shut the cylinder off & the misfire becomes even more apparent!
If your scan tool’s misfire history indicates multiple cylinder misfires, focus on the cylinder with the most misfire counts. The misfire counts on adjacent cylinders are often “sympathetic” misfires that will often disappear when the primary misfire is repaired.
How to diagnose an intermittent engine misfire?
When diagnosing intermittent misfires, don’t forget to look at pending codes for indications of an individual cylinder misfire. If your scan tool’s misfire history indicates multiple cylinder misfires, focus on the cylinder with the most misfire counts.
What causes an engine to misfire in cold weather?
Intake manifold gaskets, especially those sealed with rubber O-rings, are often temperature-sensitive and can cause lean misfires when the engine is cold. A disintegrating substrate in a catalytic converter can also cause intermittent misfires when the cylinders can’t draw enough air to support combustion.