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Old 06-25-2016, 05:13 AM   #1 (permalink)
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Default 2005 Forenza P0300 Misfire???

Hi everyone, I'm in need of help. I've recently purchased a 2005 forenza currently with 105,XXX miles. A week and a half ago the engine started to misfire and engine light would proceed to flash. I checked the engine light for code(s) and it said P0300 Random Misfire Detected. Not knowing what it was, and getting advice from some mechanics i tried to do a process of elimnation. I had the Camshaft Postion Sensor, Plugs, Wires and Ignition Coil all replaced. Still having the same problem. The car did run completely fine for a full 6 days after New wires and plugs were replaced. The only thing that I have taken notice of is that it seems to always be low on coolant. Could that be clue to the random misfire?? Please help! Thanks in advance.
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Old 07-07-2016, 11:59 AM   #2 (permalink)
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Coolant loss is a big flag when diagnosing a missfire..

Perform a cooling system pressure test, look for leakage into the engine...

Is there oil in coolant, or coolant in oil??

.... Philip
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Old 07-13-2016, 09:36 AM   #3 (permalink)
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Quote:
Originally Posted by aquanaut20 View Post
Coolant loss is a big flag when diagnosing a missfire..

Perform a cooling system pressure test, look for leakage into the engine...

Is there oil in coolant, or coolant in oil??

.... Philip
Thanks so much... i took it to a mechanic(same day you replied) that could work on it and told him to perform the cooling sytem pressure test, and he checked for leaks. So basically it was the head gasket and it was causing coolant to be leaking in the engine causing the random misfire. Thanks for your help!!!
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