A P0172 trouble code indicates that the system is too rich at bank 1. That means that too much fuel is used in the combustion process. Bank 1 shows that the problem is in the driver's side of the How to Fix a Cold Start Misfire. Clean the engine with carbon cleaner. The steps include running the engine, disconnecting one of the hoses leading to the intake, and dumping the cleaner into the engine, which may also require the use of a special tool. With the engine running, you’ll rev it up to let the chemical coat the valves. What the P0303 code means. The P0303 DTC is set when the ECU detects multiple misfires from cylinder 3. Misfires cause the ECU to set the Check Engine Light and put the vehicle into a failsafe mode to prevent damage. The Check Engine Light will remain until the code is repaired. The P0302 is described as “ Cylinder #2 Misfire Detected .”. No surprises here; this means you have a misfire in the #2 engine cylinder. A misfire is when the mixture of air and fuel isn’t igniting – or at least isn’t igniting consistently. It’s a serious problem because the reduced power will impact your ability to react. The knock I have is a spark knock caused by the timing being off which is causing a misfire condition.It is basically as if you turned the distributor of an older engine counter clockwise until the engine begins to sputter and knock and misfire but not far enough back to the point of backfiring.That's where my engine is at.The knocking is in the top of the engine by the way.Thanks for the Problem Description. The common problem for ignition misfires are ignition coils going bad. Replacement of the bad ignition coil is necessary. These should be fixed as soon as a problem is detected. Otherwise the misfire can cause damage to other components. 435 people reported this problem. 113 comments. ObFf. Started running sluggish and dragging to start. Engine light came on had misfire. Turned off and engine light went off. After couple of days it happened again and was worse. Took to mechanic and computer indicated #3 coil misfired. Took 3 and switched it with 5 and engine light went out. or call us on 0330 808 9527. If your engine is failing to start and/or misfiring, there might be several causes. The most common culprit for engine misfire is worn, damaged or faulty spark plugs. Engine misfiring combined with a lack of power could also be a sign of a worn-out timing belt. Our experienced mechanics can help identify and solve Car Advise says issues triggering the CEL might be as simple as a loose gas cap or something that requires a qualified mechanic, like an engine misfire. So, as long as your car appears to operate Steps to replace a bad fuel injector. Step 1: Open the hood of your car and start the vehicle. Step 2: Locate the fuse box and unplug the fuel pump relay. You can identify the relay from the description provided underneath the cover. You may need some slip-joint pliers to help pull it out. How to Diagnose and Fix. A misfire is when a part of the combustion process goes wrong in one of your car’s cylinders. Our mechanic shows you how to diagnose an engine misfire. Visit our instructional blog.

how to fix engine misfire