Code p0303

Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 3. If the problem persists more tests needs to be done to diagnose problem, see Possible Causes. If other codes are present, they must be addressed first. Check for loose connectors at the ignition coils or for damaged wiring. Look for loose engine ground wires as well. These can cause random misfire conditions.

Tighten or connect where necessary. A misfiring cylinder slows down momentarily,. Like all DTC codes , this code too means that something is wrong with your vehicle’s interior body.

Saying that, some drivers will only see their Check Engine Light shining but won’t experience any other symptoms. This diagnostic trouble code (DTC) is a generic powertrain code , which means that it applies to OBD-II equipped vehicles. Variations in camshaft and crankshaft position, as well as engine RPM help the PCM to detect an engine misfire. But- you might get some solid tips if you have a different make. Drivers head is 1-3-5- pass 2-4-6-8.

Been driving it about 2miles each weekend from Nash to Knox. Recently, started it up and it idled rough then check engine light flashed. I did was replace the spark plug and I am getting the same code. Heard I should replace the coil and maybe check.

Depending upon how intense your state inspection is clearing the code may or may not help as the code may be in the history file or with. Rhe ECM controls the injectors by ground switching the ground to the injectors and the coil is fired by using the signal from the crankshaft position sensor to the ECM. Yes, the injector signal can be checked at the ECM at the pins for the injector.

All coil packs, fuel injectors, spark plugs have been replaced. It’s not blowing through coolant. Compression test came back normal. The exhuast smells normal.

I noticed my check engine light was on (not a blinking light, solid light) i got home, got my CEL reader, when I turned the key to the on position to check the code the check engine light was still on. Also, technician mentioned that when check engine light was on, OBD-II tool identified cylinder misfire happens only at the start, especially when engine is cold. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it.

Ive replaced coil pack and plugs and wires also oil and fuel filters. It does it no matter what the weather like and sometimes it doesnt act up but the check engine light is on and even sometimes the light will go off completely and it will work fine. I threw a new spark plug in and it ran fine.

Problem came back after a tank of gas.

Says cylinder again Checked compression. While driving home from work, the car started to hesitate and the check engine light was flashing. I pulled over and got the code.

Went to Oreilly Auto Parts and bought a new Ignition coil for $112. Bought the truck in Connecticut and drove it home thinking it just needed a tune up. Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder. One morning at mph, she started to hesitate and buck.

I checked all vacuum hoses okay, checked MAF sensor, okay. They come back only after a the engine bogs down from the heat. When I attempted to move again,. I have thought about venting hood to allow some rising heat to escape.

No, bad coil would more likely misfire all the cylinders. Run the car until the code comes back then read it again. What could be causing the misfire, if its not the plugs, not the coil packs, Then what is it? Clear codes and test drive. Post the when you have that done.

So you should chech it on our car models. You said that you chained out all the plugs to coper, right? Check all the wire connectors to be sure they are firmly in place and no pins are corroded. Its a major vacuum leak leads to misfires and then leads to bad sparks ,bad cat code is only triggered for the misfire.

You need a complete tune up , changing sparks,replacing breather hose and valve that connects to the valve cover ,brake booster linkage which connects to air intake manifol IMT o-rings (of them) Good news These parts are generally cheap if buy from online or jag dealer. Since then, the plug and coilpack was replaced with no result. If it sounds smooth, it could be a transient condition.

I was personally able to solve a P30 misfire in 2nd cylinder, code by replacing the spark plugs and wires.

I found on line that the p3coad is a random missfire in all cylinders and that the last number in a p3code is the cylinder that is misfiring. If I could get some help locating the injectors I would like to try using the old screwdriver stethoscope trick. I did some search on the forum and it seems that most of the time the culprit is the ignition coil.