P0300 code "Random multiple cylinder misfire detected" - most likely cause? - Toyota Nation Forum : Toyota Car and Truck Forums
8th Generation (1998-2002) Specific discussion of the 8th generation

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#1 Old 09-06-2009, 02:23 PM
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P0300 code "Random multiple cylinder misfire detected" - most likely cause?

2002 Corolla with 79k miles. Check engine light came on today. Car runs great otherwise. Took it to Advance Auto Parts and thier OBD II code scanner displayed: P0300 - "Random multiple cylinder misfire detected".

I know it's impossible to say exactly what this might be, but does anyone know if there is a "most likely" cause for this code?

The parts store said if could be either an ignition coil / pack, or, spark plug wires, or plugs (in other words, something ignition related). They're leaning torwards the problem being the ignition coil / pack, but admit they don't know for sure.

Thanks.
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#2 Old 09-06-2009, 07:36 PM
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What started as a random misfire eventually narrowed down to a specific cylinder on my car. From there it was easy to diagnose what was going on, but I have my own ODBII reader too. (Ended up being burnt exhaust valve.) Just sharing my experience.

But as far as being the most likely cause? I read a lot of people saying the same, "coils or plugs." Seems like a cheap answer, but again I'm no expert. You can test your coils and plugs if you have the time. Good place to start.

Anyone else?

-Rand

Last edited by randini667; 09-06-2009 at 07:42 PM.
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#3 Old 10-07-2009, 01:08 PM
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Cleared the code and several weeks went by without the check engine light coming back on. The check engine light came back on yesterday. Car runs perfect regardless of whether or not the check engine light is on.
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#4 Old 10-07-2009, 01:33 PM
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Pull some plugs and see how they look.
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#5 Old 01-03-2010, 08:07 PM
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Originally Posted by randini667 View Post
Pull some plugs and see how they look.
Update:

Replaced the plugs a couple months back. Noticed that the #3 plug had more soot on it than the other three plugs. It was a light (whitish) colored soot. After I replaced the plugs, I cleared the P0300 code. A few weeks ago, the check engine light came on again. This time the code read P0303. I switched the #3 and #4 ignition coils and once again cleared the code. If the check engine light does come on again, I'm hoping that it'll be a P0304 (meaning it was the ignition coil).
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#6 Old 01-03-2010, 08:38 PM
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Well on your way to diagnosing the issue.

BTW... Do you ever get the flashing CEL on top of the solid?

-Randy
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#7 Old 01-03-2010, 08:41 PM
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clean the MAF and try a different brand of fuel. i got some cheap gas that caused misfire codes.
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#8 Old 01-03-2010, 09:10 PM
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Quote:
Originally Posted by randini667 View Post
Well on your way to diagnosing the issue.

BTW... Do you ever get the flashing CEL on top of the solid?

-Randy
A "flashing CEL", would that be on the code scanner? If so, I don't think it's flashing. If it was, I didn't notice. What would a flashing CEL indicate?
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#9 Old 01-03-2010, 10:31 PM
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The Check Engine Light should flash whenever a misfire condition is occuring.
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#10 Old 01-04-2010, 04:44 AM
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Originally Posted by AlaricD View Post
The Check Engine Light should flash whenever a misfire condition is occuring.
LOL, my brain must've been chilled from the cold temps here yesterday because it took me until this morning to realize that CEL means Check Engine Light.

Anyway, no the check engine light never flashed. It came on, but once it came on, it stayed on without flashing.
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#11 Old 01-04-2010, 03:33 PM
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i have a 1998 toyota Corolla and i had miss firing on my car turns out i had a blown valve cover gasket and Oil was getting on the Spark Plugs but my Check Engine Light flashed at me when it was miss firing

Aaron
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#12 Old 01-04-2010, 07:22 PM
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Quote:
Originally Posted by Brad1 View Post
Update:

Replaced the plugs a couple months back. Noticed that the #3 plug had more soot on it than the other three plugs. It was a light (whitish) colored soot. After I replaced the plugs, I cleared the P0300 code. A few weeks ago, the check engine light came on again. This time the code read P0303.
sounds like you're running lean on cylinder 3. if the code comes back as a p0303 I'd check the intake manifold gasket to see if there's a leak.
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#13 Old 02-01-2010, 03:19 AM
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Have the same code with code for lean on the o2 sensor. Any ideas ?
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#14 Old 02-01-2010, 06:32 AM
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Quote:
Originally Posted by Brad1 View Post
Update:

Replaced the plugs a couple months back. Noticed that the #3 plug had more soot on it than the other three plugs. It was a light (whitish) colored soot. After I replaced the plugs, I cleared the P0300 code. A few weeks ago, the check engine light came on again. This time the code read P0303. I switched the #3 and #4 ignition coils and once again cleared the code. If the check engine light does come on again, I'm hoping that it'll be a P0304 (meaning it was the ignition coil).
Check engine light hasn't come back on yet, but I've barely used the car this month. I've been running my '94 Corolla day-to-day and letting the '02 sit.
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#15 Old 03-14-2010, 09:03 PM
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BUmp this thread... Trying to diagnose my mother's issues. 2000 corolla 160K. runs great, 30K on the odo. She's had all the routing/recommended maintenance. Has thrown p0300, p0302, and p0171. If I clear it, usually will get p0300, p0300 + p0302, or p0300 + p0302 + p0171.

I changed the plugs and will wait to see if it pops up again. If the p0302 comes up, I will switch the coi packs. There was some oil around the coils in a couple of the tubes, so the valve cover gasket needs to be done. On the 2nd hole from the left (is this #2?) there was oil around the plug threads.

thx!
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