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random misfire(Toyota)


michael van's Avatar
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05-16-05, 09:55 AM   #1  
random misfire(Toyota)

Wife has a 2000 Toyota Corolla CEL came on this morning.Engine is a 1.8L with 42 thousand miles car bought from dealer with 30 thousand all I ever did was change oil.
Went to the Zone for the code came back as a PO300 random misfire.
What do you think plugs?
what else could it be?If it is plugs will replacing them clear code if not how do i get rid of it?
Wife says car runs fine no hard starts no stummbles or misses.And that is the ONLY code stored.


Last edited by michael van; 05-16-05 at 04:26 PM.
 
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toyotaman11769's Avatar
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05-16-05, 04:39 PM   #2  
Have seen P0 300’s set by the driveway shuffle, moving cars to get other cars out. It takes about two or three times of letting it run only a few secs’ to “load” up and cause this condition.

Also can be cause by using premium in a engine that’s designed for 87 octane. Some people are under the impression its better for it….it can actually cause problems.

What about the air filter?

 
michael van's Avatar
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05-16-05, 05:20 PM   #3  
clean filter

The air filter is clean last time i checked as far as fuel only the 87 octane sees the filler neck.Might be a fluke but i thought i might ask for advice.Might be OEM plugs in there.
I know Toyota put in new airfilter before sale changed oil and did general clean up.
Will light go off or is this something that has to be reset by a scanner?
Car just passed emmision test last week no problem.

 
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05-16-05, 07:17 PM   #4  
Should stay on for 3 trips and then go out. Would stay in history for 40 trips. Thats assuming it doesn't see the problem.

 
michael van's Avatar
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05-16-05, 07:24 PM   #5  
thanks a zillion

Thanks Larry I will change plugs and see what happens.When you say trip is that one cyle? one engine start off cycle.
You have been a super help and I trust your knowleage on Toyota cars and trucks Thanks again.

 
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05-16-05, 07:41 PM   #6  
Trips are different for different codes. I think its more than a key cycle....most likely needs to go through a warm up.

Possibly some water in fuel?

 
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05-16-05, 07:47 PM   #7  
Yikes

I never thought about the water in the fuel with gas pices being so high I go to the cheapest places like wallmart or costco.I keep tank full but you are right it might be that.I guess a bottle of the water in tank treatment wont hurt. Thanks good info.

 
michael van's Avatar
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05-18-05, 05:13 PM   #8  
fixed Larry

Just to update you your advice was right on the money again.I bought a bottle of HEET water eliminator and just like you said about 4 trips the light went off.
I am going to leave the plugs in since they are the iridium type.Been driving all over Fort Worth with no light.
Once again good call mr Toyotaman.and thanks again.

 
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