Question about 2004 Chrysler Sebring

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Tried switching injectors reflashed PCM spark plugs but still p0301 comes back, car runs good

2004 chrysler sebring 2.7 liter engine p0301

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Hi, did you ever fix this problem? If so, what was it? I'm having the same exact problem with the same exact car and engine.


Thanks
Lydia

Posted on Jun 04, 2010

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Code P0301 = Cylinder 1 Misfire Detected
Start with the “easy to check” items first...Some of these checks/repairs require specialized tools or equipment. A trusted repair shop or dealer would be would be advised to correct this problem.
Try changing the spark plugs, Check the coil, TPS sensor & MAP sensor voltage. Check the fuel pressure, check for vacuum leaks including intake manifold. Dirty or plugged injector, timing, compression test-including leak test--meaning, put #1 on TDC then charge the cylinder with air (~30lbs), and check for leak via exhaust/intake. Update PCM to the latest software, Worn camshaft.

Posted on May 19, 2009

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P0301 IS A MISSFIRE CODE FOR # 1 CYLINDER
IT COULD BE SPARK PLUG, STOPPED UP FUEL INJECTOR, COIL ( IF COIL ON PLUG TYPE ), OR PLUG WIRE . COULD ALSO BE A BASE ENGINE PROBLEM VALVE , BROKE PISTON RINGS, ETC.

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Cde po301


A P0301 code means that the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #1.

Symptoms may include:
· the engine may be harder to start
· the engine may stumble / stumble, and/or hesitate
· other symptoms may also be present

A code P0301 may mean that one or more of the following has happened:

· Faulty spark plug or wire
· Faulty coil (pack)
· Faulty oxygen sensor(s)
· Faulty fuel injector
· Burned exhaust valve
· Faulty catalytic converter(s)
· Running out of fuel
· Poor compression
· Defective computer

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Feb 15, 2010 | 2004 GMC Envoy

2 Answers

I replaced all of the O2 sensor on my car, but the check engine light is still on, or came back on with hte same code


check your heated 02 fuses. check your wiring for rubbed through insulation. also, lots of PCM issues and reflashes on these cars.

Nov 11, 2009 | 2004 Chrysler Sebring

1 Answer

Ok i had a p0302 and then i changed plug wires coil packs the icm injectors camshaft sensor and now i can a p0301 code.. and when i clear the code it will come back with the same code or else a p0300.. im...


1. Freeze Powertrain Control Module (PCM) and see if the problem can be duplicated.

2. Wiggle tug test wiring for #2 injector.

3. Scope the #2 injector for a glitch when the misfire happens. 1. Test for the Exhaust Gas Recirculation (EGR)/coolant adapter gasket leaking EGR gases past the gasket.

2. Connect a vacuum pump to the MAP sensor, block the vacuum source, reset fuel trims, start the engine and add typical vacuum to the MAP sensor and check operation.

3. Test the spark output with 2 High Energy Ignition (HEI) testers, at 25 KV air gap each, at the spark plug wires to ground at wires 2 and 3, then 1 and 4 at cranking speed and engine running.

4. Test the fuel injector pulse width at the injectors compared to the scanner data.

5. Disconnect the O2 sensor, reset the fuel trims, test the system operation in open loop, test injector pulse width. Compare to the closed loop operation injector pulse width and engine operation.

6. Test the Powertrain Control Module (PCM) powers and grounds during the problem.

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