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Old 09-18-2014, 09:44 PM   #1 (permalink)
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Default Random/Multiple engine misfires

I'm having a multiple misfires in my 2007 Suzuki Forenza. The car started to sound weird about a week ago, but no engine light. In the middle of an intersection two days ago, I lost acceleration, engine light started to blink, and the car started to shake. After hooking up a scan tool, I got 6 codes. TWO P0300, TWO P0301, and TWO P0304. All of this read as "random/multiple engine misfire." I took the spark plugs out, and I noticed that in the 4th cylinder there was a very small amount of engine oil on the end of the spark plug and on the top of the piston in the cylinder. Also, I took the oil cap off and the oil smells like gasoline. Please shed some light on this issue... I need to fix this car but I do not have the money right now to take it to a mechanic. The coolant tank doesn't have a fuel smell to it, by the way. Thank you!
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Old 09-26-2014, 12:34 AM   #2 (permalink)
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My Suzuki 2004 Forenza has similar problem with P0300 code due to ignition Coil failure.
Hope this help you also.
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Old 09-26-2014, 01:51 AM   #3 (permalink)
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first of all, clean the plugs and swap the plug on #4 to another cyl, if its a coil it will foul the plug you put into #4. If it fouls another cyl (the one you put the plug out of #4 into), then its a dead plug.

cheap way to diagnose the problem too.


as for the gas smell in the oil, quite common, especially if you only do short trips round town, or its been misfiring as the unburnt fuel gets past the rings and into the oil, diluting it a bit, which is also why you seem to use oil on a long trip but never round town because the long trip drives out all the unburnt fuel and moisture in the oil from all those short trips you did....but i digress
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