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Standing on the passenger side.looking at the engine. Number 1 is the first cylinder on your left. Follow the wire to the coil. unplug it at the coil, lay the end of the plug close to the tip of the cap and start the engine. If there isn't multiple sparks, replace the coil. If there is , replace the plug and or wire. If you still have a misfire after that, do a compression test on number 1 cylinder.
well that code means ur have a missfire in cylinder one change the wires for the spark plugs that really the only thing i can think off beacuse you have already done the spark plugs and the oxygen sensors and the coil packs
P0301P is the same as P0301, but it just means its a pending code. If you have a pontiac, that is a cylinder 1 misfire code. Check the spark plugs and wires. Compare # 1 to the rest on how they look. Could be a cap & rotor issue as well, or coil pack. (Can't say because you didn't leave any vehicle info)
These codes are making me lean towards the ignition coil pack.My stepson's 2001 Sable 3.0 v6 had one cylinder misfiring(5-code P0305),which shares a coil with cylinder 1(code P0301).I diagnosed it by trading wire 1 and 5 at the coil,and the code changed to P0301.You have codes for the two cylinders on the same coil,so this is most likely it.(these codes would also trigger P0300(Multiple Misfires Detected) and P0316(Misfire Detected First 1000 Revs)).
Possible Causes: - Improper spark plug at cylinder #1 - Insufficient compression at cylinder #1 - Incorrect fuel pressure - The injector circuit is open or shorted at cylinder #1 - Fuel injector #1 may be faulty - Intake air leak at cylinder
Possible Solutions: - Perform Injector Service - Replaced Spark Plug #1 - Replaced Injector #1 - Replaced Ignition Coil #1
Causes: - Improper spark plug at cylinder #1 - Insufficient compression at cylinder #1 - Incorrect fuel pressure - The injector circuit is open or shorted at cylinder #1 - Fuel injector #1 may be faulty - Intake air leak
Very first one in the front of the engine. Cheapest way to fix this is to replace your spark plugs first. Use AC Delco 41-103, a little more than off brands, but will idle better than any other plug. If this doesn't work, replace the coil pack on cylinder 1. One of these will fix the problem. Also, check the wires that coil plugs into, if all else fails.
If the plugs, wires, and coil are all good then it can be a partially clogged injector, or low compression on that cylinder. It can also be a bad ECU. My cousin had a 99 Taurus with the exact same problem and it turned out to be the ECU which he had to replace. The ECU is very expensive so make darn sure everything else is good before you replace the ECU. It could be the coil has an intermittent problem and may show good especially when cool. You might try putting that coil on a different plug position, resetting the ECU, and see if you get the same code PO301. Run a compression test on all cylinders to see if you have good compression. Add a can of Seafoam Fuel Treatment to a full tank of fuel to make sure the injectors are clean. Check all wiring closely for frayed wires or loose connections. Eliminate all other possibilities before looking at the ECU itself.