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2003 GT Turbo Misfire/Codes at Operating Temperature

 
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Old 14 Jun 2017, 12:44 pm
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Default 2003 GT Turbo Misfire/Codes at Operating Temperature

Good morning all. My daughter has a 2003 PT 2.4L GT Turbo and it has an interesting problem. I have done plenty of reading and seen similar problems mentioned, but not quite like this. The car starts right up when cold and runs perfectly. After about 10 minutes when the engine is up to normal operating temperature, it starts bucking and misfiring and throws the code P2302, "Ignition Coil A Secondary Circuit". It seems to happen on the first normal acceleration after normal operating temperature is reached. If driven when the engine is still cold, it operates fine, until it comes up to temperature. The odd thing is, if I shut the car off and immediately restart it, it runs fine again. Since this problem began, the plugs, wires, cam position sensor, and coil have been replaced with new and no change. The ECU has been tested by a repair shop and it passed. The connections to the coil, the ECU and the cam position sensor are clean and corrosion free. The wiring harness looks to be in good condition. The air filter is clean and free of obstructions. I can't see any damaged or missing vacuum lines. Any help would be greatly appreciated. I am a pretty decent DIY with a lot of tools, but not much experience on the PT.
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Old 14 Jun 2017, 08:43 pm
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Default Re: 2003 GT Turbo Misfire/Codes at Operating Temperature

I encountered this same problem. It's intermittent, and you will get a high resistance on one of the coil control circuit wires, either #1 or #2. My guess is with age and heat wear the wiring gets problems.

One way you can confirm this is to jumper with a test lead the coil control wire to the ignition coil, either 1 or 2 as the misfiring is triggered. To do this, drive the car until the problem starts, pull over and diagnose. I used a needle-pin test lead to get into the weather packing on the ignition coil and PCM #2 connector. Of course you need to get the diagrams and pin-out of both connectors and mark the wires to test with a paint pen.


The solution for myself was to remove the wiring harness completely, open it up, and replace the wire that is giving trouble.
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Old 14 Jun 2017, 10:39 pm
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Default Re: 2003 GT Turbo Misfire/Codes at Operating Temperature

P2303 could be caused by a faulty spark plug, spark plug wire, ignition coil, or coil circuit fault. Coil circuit fault can be caused by a faulty engine computer or wiring. Irregular spark burn time could also be caused by a cylinder mechanical or fuel problem.

Your PT Cruiser employs a waste spark ignition system. This means two ignition coils, both contained within a single assembly, provide spark for the four cylinders. Coil No. 1 fires cylinders 1 and 4, and Coil No. 2 fires cylinders 2 and 3. Since the No. 2 coil fires two cylinders, the problem could reside within either of the two cylinders, or with the coil or coil control circuit, causing misfiring in both cylinders.

I'd begin by double-checking the diagnostic trouble code. Have you reset the code with an OBDII Scan tool and see if it comes back? Has any other code come up with the P2302?

If only the code P2303 comes back there is a cylinder balance test which determines power contribution of each cylinder:

1. A compression test, which looks for mechanical faults;
2. An injector balance test to check injector flow rates.
3. Careful observation of the No. 2 coil control circuit, use an oscilloscope or graphing multimeter to verify correct and consistent electrical signals sent by the engine computer to the coil.
4. Take a close look at the fuel injector circuit commands for cylinders 2 and 3.
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Last edited by ptcruisersteve; 14 Jun 2017 at 10:48 pm.
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