Mechanics

P0300 CODE

2003 Chrysler PT Cruiser

Engine Performance problem
2003 Chrysler PT Cruiser 4 cyl Front Wheel Drive Automatic 73,000 miles

Hi,

My 2003 PT Cruiser GT has been haunting me with a misfire code for the past 4 months and it's time for it to go! The symptoms I receive are as follows; very hard to get started, idles very rough, and sometimes the engine dies when there is a large load on the engine (lights, radio, heater on while braking). Funny thing is, when the engine warms up, it starts right away, and while driving it seems to run wonderfully. I have changed the spark plugs and wires. The wires are the correct gauge and the plugs are gapped to the right size. I don't want to go to a shop since I am mechanically inclined, and I am trying my best to avoid a pricey troubleshooting process. Especially with today's economy! I would appreciate any advice you can offer guys!

Thanks,

-Nate
Avatar
Ptcruiser
February 24, 2009.




So it has only given P0300? You may have a bad coil. Usually misfires under load are ignition related, injectors tend to miss at idle then go away when rpms are attained.A weak/bad coil can cause cold starting problems. Also check the fuel pressure regulator on the fuel rail with a vacuum line to intake, if any fuel is in the vacuum line replace the regualtor
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Tiny
Jack42
Feb 25, 2009.
I am sorry, I had just learned if I turn the key from off to run back and fourth 3 times then I get a read out of all codes in the tach display. I also have a P0522 and a barometric pressure low code. But they come and go, the P0300 is there all the time. Thanks for the advise thus far. I will try out what you recomended and get back to you.

Tiny
Ptcruiser
Feb 25, 2009.
The P0522 is for a low oil pressure reading. Be sure it is full, may have a bad sensor. Do you know th eexact # for the Baro code, that can harm performance as well

Tiny
Jack42
Feb 25, 2009.
The exact code is P0129

Tiny
Ptcruiser
Feb 25, 2009.
Hey I replaced the ignition coil and I no longer have a hard time starting the car. Thank you! But I still have a P0300 - random misfire code. I am exhausted on ideas.

Tiny
Ptcruiser
Feb 26, 2009.


http://www.2carpros.com/forum/automotive_pictures/55316_03gtcruisermil_1.jpg



Replacing the coil would have been the fix that you need for the P0300. But the CEL has to be either physically reset via an OBD-II scan tool or 3 good trips without any problems seen by the PCM.

I would suggest that you bring the vehicle to your local Autozone, and they can read and then erase/reset the computer. Please be sure though that you only receive P0300 from their scanner prior to erasing. If they find any other DTCs or codes, please report back with the code numbers.

Tiny
Zackman
Feb 27, 2009.
Well. The problem still seems to be present. The car has the same symptoms; rough idle, hard to start when cold, and sputters under load on low rpm's. I am going to change the spark plugs to see if they are fouled. After that I am out of ideas! HELP!

Tiny
Ptcruiser
Mar 5, 2009.
Did you get the codes cleared properly so that we can see what comes back?

Tiny
Jack42
Mar 16, 2009.

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