P0303 code

This diagnostic trouble code (DTC) is a generic powertrain code , which means that it applies to OBD-II equipped vehicles. 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. Keep getting misfire codes. Saying that, some drivers will only see their Check Engine Light shining but won’t experience any other symptoms. A misfiring cylinder slows down momentarily,.

Variations in camshaft and crankshaft position, as well as engine RPM help the PCM to detect an engine misfire. Hi everyone i have a problem with my car Code is P253F (engine light is amber) Plese help me what i need to do ? 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. Recently been having rough start ups that led to an all out cylinder run on the way home. I threw a new spark plug in and it ran fine. Well, while driving home about weeks ago. At speeds of 60MPH or 70MPH I notice my engine light started to blink several times, until it stop and staid on.

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

I replaced the plugs and the code still comes back. I get rough idle and hesitation lack of power. I used a stethoscope and could hear every injector clicking. The exhuast smells normal. Is a coil pack my next thing to replace?

Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Set conditions, t he variation in crankshaft speed between each cylinder exceeds a calibrated value, based on engine rpm load. Fired it up and it stumbled badly.

I know this is a misfire on cylinder 3. I assume cylinder is third from the front. I pulled the coil pack rail and noticed that the boot on the third from the from was discolored (maybe from heat?). I swapped and spark plugs (They looked fine) and it seems to idle fine. Parts required: Repair procedure: 1. Any one here have this problem?

So what is the first thing to check when you get this po3code ? I just repaced the plugs, fuel filter, and ran a bottle of bg44k through the gas tank and about weeks after i did all that this code pops up. 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.

What could be causing the misfire, if its not the plugs, not the coil packs, Then what is it? Checked plugs, wire, coil all seemed good. Did a compression test on all cylinders tested at 1cylinder tested at 90. Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder. I thought it was the transmission but tonight the Check engine light came on.

No, bad coil would more likely misfire all the cylinders. Faulty IMRC actuator relay (if equipped) A large air leak at or near the number one oxygen sensor would also cause a lean mixture. Flashing check engine light. Bought the truck in Connecticut and drove it home thinking it just needed a tune up.

Just got a call from my mechanic, he said it was my timing belt.

Foreign vehicles may also use DTC codes different from the generic Engine Diagnostic codes. 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. 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 your luck the intermittent issue crops up again just in time during the inspection. Honda Civic EX (cylinder) 150miles.

I did some research on line and so far this can be the cause. Faulty Spark Plugs, Faulty Spark Plug Wires, Coil Pack, Fuel Injector. I took the MSD coil off and put the stock coil back on.

Re-soldered all the connections and wrapped them proper. I had her take it to Autozone to have the codes pulled. It was extremely cold in our area (probably around 15F this morning, with the garage aound 30F).

Has been fantastic so far. Had a misfire code pop up and along with cam e the rough idling and the feel of lost power slipping while driving. Replaced wires and plugs first, then the coil. Seemed OK at first, but the code has come back. You did all that for a miss fire in number three?

Are you tired of spending money yet?